Vaisala Spectracap OMT355 User Manual
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Vaisala Spectracap OMT355 User Manual

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USER'S GUIDE
Vaisala SPECTRACAP®
Oxygen Transmitter
OMT355
M210735EN-D

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Summary of Contents for Vaisala Spectracap OMT355

  • Page 1 USER'S GUIDE Vaisala SPECTRACAP® Oxygen Transmitter OMT355 M210735EN-D...
  • Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the...

  • Page 3: Table Of Contents

    PRODUCT OVERVIEW ........17 Introduction to Vaisala SPECTRACAP® Oxygen Transmitter OMT355 .
  • Page 4 ________________________________________________________________________________ Suitable Process Flanges ..... . 31 Filter Recommendation ......31 Mounting with Flange Adapter .
  • Page 5 (VERS) ........86 VAISALA ________________________________________________________________________ 3...
  • Page 6 ________________________________________________________________________________ Memory Handling ....... . .86 Save Parameters Command (SAVE) ....86 Resetting the Transmitter .
  • Page 7 (FCRESTORE) ......136 Restore Factory Calibration Function (Fac) ..137 VAISALA ________________________________________________________________________ 5...
  • Page 8 Return Instructions .......152 Vaisala Service Centers ......153 CHAPTER 11 TECHNICAL DATA .
  • Page 9 Figure 1 Flange Mounted Vaisala SPECTRACAP® Oxygen Transmitter OMT355 ....... . 19 Figure 2 OMT355 with Sampling Cell.
  • Page 10 ________________________________________________________________________________ 8 _______________________________________________________________________________...
  • Page 11 Table 23 Options and Accessories ....... 158 VAISALA ________________________________________________________________________ 9...
  • Page 12 ________________________________________________________________________________ 10 ______________________________________________________________________________...

  • Page 13: General Information

    Chapter 1 ________________________________________________________ General Information CHAPTER 1 GENERAL INFORMATION About This Manual This manual provides information for installing, operating, and ® maintaining Vaisala SPECTRACAP Oxygen Transmitter OMT355. General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a serious hazard.

  • Page 14: Feedback

    User's Guide ______________________________________________________________________ Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by e- mail: manuals@vaisala.com.

  • Page 15: Esd Protection

    Chapter 1 ________________________________________________________ General Information ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.

  • Page 16: Regulatory Compliances

    DuPont. License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.

  • Page 17: Warranty

    The allegedly defective Product or part shall, should Products supplied hereunder, which obligations and Vaisala so require, be sent to the works of Vaisala or to liabilities are hereby expressly cancelled and waived. such other place as Vaisala may indicate in writing,...
  • Page 18 User's Guide ______________________________________________________________________ 16 __________________________________________________________________ M210735EN-D...

  • Page 19: Chapter 2 Product Overview

    Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW ® Introduction to Vaisala SPECTRACAP Oxygen Transmitter OMT355 The following sections provide a short overview of Vaisala ® SPECTRACAP Oxygen Transmitter OMT355 and describes the three different versions of the product. ® Vaisala SPECTRACAP Oxygen Transmitter OMT355 is an optical device for measuring oxygen concentration in gases.

  • Page 20: Omt355 For In-Line And Sampling Cell Mounting

    User's Guide ______________________________________________________________________ and the lubrication materials used in the sealings do not react with oxygen. WARNING Beware of high concentrations of O : they are highly oxidant/ oxidizing. High O concentrations strongly promote combustion and may react violently with combustible substances. OMT355 for In-Line and Sampling Cell Mounting In processes with moderate temperatures (up to 80 °C) and limited pressures (0.8 ...

  • Page 21: Figure 1 Flange Mounted Vaisala Spectracap Oxygen Transmitter Omt355

    Chapter 2 __________________________________________________________ Product Overview ® 0605-001 Figure 1 Flange Mounted Vaisala SPECTRACAP Oxygen Transmitter OMT355 0605-002 Figure 2 OMT355 with Sampling Cell VAISALA _______________________________________________________________________ 19...

  • Page 22: Ambient Gas Measurement Version Of Omt355

    User's Guide ______________________________________________________________________ Ambient Gas Measurement Version of OMT355 0605-003 Figure 3 OMT355 for Ambient Gas Measurement Ambient oxygen concentration measurement, for example in oxygen deficiency monitoring, requires a special version of OMT355. Please observe that sections of this User's Guide covering the version for ambient gas measurement are applicable only to customers who have ordered this specific version of the transmitter.

  • Page 23: Functional Description

    Figure 4 on page 22 illustrates the oxygen absorption spectrum and Figure 5 on page 22 the modulation of the laser wavelength. VAISALA _______________________________________________________________________ 21...

  • Page 24: Figure 4 O2 Absorption Spectrum Around The 760 Nm Near Infrared

    User's Guide ______________________________________________________________________ WAVELENGTH (NM) 0512-049 Figure 4 Absorption Spectrum Around the 760 nm Near Infrared Region 0511-034 Figure 5 Adjacent O Absorption Lines and Laser Emission Peak 22 __________________________________________________________________ M210735EN-D...

  • Page 25: Construction Of Omt355 Probe

    The probe is constructed from AISI 316 stainless steel for good resistance to aggressive chemicals and demanding environments. Other sample wetted materials are the thin film coating of the optical surfaces (MgF on the lens, SiN on the mirror), and the choice of O-ring VAISALA _______________________________________________________________________ 23...

  • Page 26: Eye Safety

    User's Guide ______________________________________________________________________ material. The probe design incorporates also a Pt1000 temperature sensor in a stainless steel enclosure for making an on-line temperature compensation to the measurement, and two heating resistors used to heat the protective window and the focusing mirror to prevent condensation on the optical surfaces.

  • Page 27: Chapter 4 Installation

    Spectrum 6375 (perfluoroelastomer with a fluorinated backbone) EPDM is the default material, and suitable for a variety of applications. Kalrez sealings may be used if aggressive solvents or chemicals are present. Note that Kalrez is not suitable for temperatures below VAISALA _______________________________________________________________________ 25...

  • Page 28: Omt355 Dimensions

    Changing the sealings later is work intensive, and can only be done at Vaisala. OMT355 Dimensions Figure 8 on page 26, all the important dimensions of the Vaisala ® SPECTRACAP Oxygen Transmitter OMT355 are given in mm.

  • Page 29: Temperature Conditions Of Installation Location

    The interfering effect of a light source depends on the filter used on the measurement probe and how badly the light is shining into the measurement probe. The interfering effect is at its worst if no filter VAISALA _______________________________________________________________________ 27...

  • Page 30: Maximum Allowed Installation Angle

    User's Guide ______________________________________________________________________ is used and the light (for example, sun) is shining directly to the probe lens or mirror. Even the stainless steel mesh filter attenuates some ambient light. Usually it is enough to suppress for example normal indoor or laboratory universal lighting.

  • Page 31: Mounting Options

    Flange mounted for in-line process gas measurement Sampling cell mounted; either with direct feed from the process, or with sample gas treatment system. The different mounting options have certain limitations regarding process conditions. These are listed in Table 2 on page VAISALA _______________________________________________________________________ 29...

  • Page 32: Table 2 Process Conditions And Mounting Options

    User's Guide ______________________________________________________________________ Also available is a version of OMT355 specifically designed for ambient gas measurement, see Mounting OMT355 for Ambient Gas Measurement on page 39 for its installation. Table 2 Process Conditions and Mounting Options Flange Mounted (In- Sampling Cell Sampling Cell Line) Mounted, Direct Feed...

  • Page 33: Flange Mounted For In-Line Process Gas Measurement

    At a minimum, use of the stainless steel mesh filter is recommended. The stainless steel mesh provides protection against coarse dirt such as large specks of dust. If a short response time is not of great importance, VAISALA _______________________________________________________________________ 31...

  • Page 34: Mounting With Flange Adapter

    User's Guide ______________________________________________________________________ use of the PTFE filter in addition to the stainless steel mesh filter is advised. The PTFE filter is placed under the stainless steel mesh filter and it is effective at preventing liquid water, dust and other contaminants from entering the optics.

  • Page 35: Figure 11 Dimensions, Omt 355 Flange Mounted

    Therefore this procedure is not recommended. 0511-039 Figure 11 Dimensions, OMT 355 Flange Mounted The following number refers to Figure 11 on page Max. screw size M5 VAISALA _______________________________________________________________________ 33...

  • Page 36: Mounting With Sampling Cell

    User's Guide ______________________________________________________________________ Mounting with Sampling Cell For processes with high temperatures, elevated pressure or extremely difficult mechanical conditions the sampling cell option of OMT355 ® can be used. Due to the robustness of the SPECTRACAP sensor and its low sensitivity to gas flow and pressure variations a very simple sampling system can be used.

  • Page 37: Figure 13 Sample Gas Treatment System

    Figure 13 on page 0511-041 Figure 13 Sample Gas Treatment System The following numbers refer to Figure 13 on page Gas in Hydrophobic filter Stainless steel (AISI316) tube coil Water trap Sample pump Oxygen sensor VAISALA _______________________________________________________________________ 35...

  • Page 38: Mounting With Wall Mounting Bracket

    User's Guide ______________________________________________________________________ Mounting with Wall Mounting Bracket The transmitter is mounted with the wall mounting bracket as follows: The wall mounting bracket has four ø 6.5 mm holes for wall attachment with screws or bolts; see Figure 19 on page 41 for wall mounting bracket dimensions.

  • Page 39: Sampling Cell Instructions

    To reinstall, simply reverse the procedure. There is a sealing between the sampling cell and transmitter housing. Check that it is in its place when reinstalling the sampling cell. The Swagelok connectors for the sample gas are to face directly downwards. VAISALA _______________________________________________________________________ 37...

  • Page 40: Figure 15 Detaching Sampling Cell

    User's Guide ______________________________________________________________________ 0604-066 Figure 15 Detaching Sampling Cell There is a drain slot in the middle of the sampling cell for draining any condensation that might have gathered inside the sampling cell. The slot is plugged with a screw and a small O-ring sealing. If the process conditions are such that a lot of condensation is to be expected inside the sampling cell, it is recommended that you install a valve in the drain slot for draining the condensed water from the sampling cell.

  • Page 41: Mounting Omt355 For Ambient Gas Measurement

    (for example, anchor bolts for a concrete wall). Attach the transmitter to the wall mounting bracket using the four M6 screws provided. For easier installation, you can pre-fix the two outer screws to the threads at the bottom of the transmitter as VAISALA _______________________________________________________________________ 39...

  • Page 42: Figure 18 Omt355 Wall Mounted

    User's Guide ______________________________________________________________________ the outer screw holes of the wall mounting bracket are slotted. This way it is easier to attach the two inner screws as you place the transmitter on the wall mounting bracket. Finish the installation by tightening all four screws. 0511-045 Figure 18 OMT355 Wall Mounted...

  • Page 43: Connections

    The following numbers refer to Figure 19 on page ø 6.5 mm, four pieces Max. screw size M5 Connections Signal and Power Supply Wiring CAUTION Before making any electrical connections, always make sure that the power supply wires are unpowered. VAISALA _______________________________________________________________________ 41...

  • Page 44: Figure 20 Connections/Local Interface Layout

    User's Guide ______________________________________________________________________ 0511-047 Figure 20 Connections/Local Interface Layout The following numbers refer to Figure 20 on page Cable bushing (conduit fitting or connector) Calibration gas inlet (optional) Grounding terminal Power ON/OFF switch Service Interface (RS232C) Local Interface keypad push buttons Supply voltage terminals Current output terminals 10 =...
  • Page 45 A green LED lights up after the transmitter has found the absorption line and a valid measurement can be made. When the self test has successfully been completed, close the transmitter back cover. The transmitter is now ready for use. VAISALA _______________________________________________________________________ 43...

  • Page 46: Connecting Omt355 With Optional 8-Pin Connector

    User's Guide ______________________________________________________________________ Connecting OMT355 with Optional 8-Pin Connector If you have purchased your OMT355 with the optional 8-pin connector, please refer to Figure 21 on page 44 Table 3 on page 44 information on the connector terminals. 0511-048 Figure 21 Optional 8-Pin Connector Table 3 8-Pin Connector Terminals...

  • Page 47: Chapter 5 Operation

    Read the instructions through carefully before making any adjustments or parameter changes. Vaisala accepts no responsibility for parameter or settings changes nor adjustments made by the user. When you require technical support or assistance, please contact Vaisala Technical...

  • Page 48: Service Interface

    PC terminal program through the Service Interface. The transmitter can be connected to a PC by using either a Serial interface cable (Vaisala order code: 19446ZZ) or a USB-RJ45 Serial interface cable (Vaisala order code: 219685). If...

  • Page 49: Customer Interface

    COM port. There is no reason to uninstall the driver for normal use. However, if you wish to remove the driver files and all Vaisala USB cable devices, you can do so by uninstalling the entry for Vaisala USB Instrument Driver from the Add or Remove Programs (Programs and Features in Windows Vista) in the Windows Control Panel.

  • Page 50: Local Interface (Keypad And Display)

    User's Guide ______________________________________________________________________ Local Interface (Keypad and Display) Features The main purpose of the local (keypad/display) interface is field calibration. It is also possible to set process pressure, humidity and carbon dioxide content to achieve better accuracy of measurement. Also the analog outputs can be forced to certain states for a system test.

  • Page 51: Display Modes

    When self-test is complete, the text "PASS" is displayed and a warm-up period begins. When warm-up is complete, oxygen measurement starts. A blank display is shown first, followed by the oxygen measurement reading. The entire start-up sequence takes approximately 2.5 minutes. 0511-062 0511-063 0511-064 0511-065 0511-066 VAISALA _______________________________________________________________________ 49...

  • Page 52: Normal Operation

    User's Guide ______________________________________________________________________ 0511-067 Normal Operation Oxygen measurement reading is displayed. 0511-068 Error Condition Error condition number is displayed. 0511-069 Warning The green LED is blinking slowly and oxygen concentration reading is shown. Choose Err function from the menu or use serial line commands to see the error message.

  • Page 53: Service Interface

    Use a jumper to enable or disable the line termination. There are three separate operation modes: STOP, POLL and RUN. The RS-485 interface supports the standard Vaisala Instruments command set with additional device specific commands. The default mode of operation is the POLL mode. RUN mode is the continuous printing mode.

  • Page 54: Functions

    User's Guide ______________________________________________________________________ Functions General Instructions for Using Functions Functions are used through the Local Interface. Access (activate) the menu with the Up or Dn keys. Activate the functions by pressing the Ent key, use the Up/Dn keys to scroll through the menu. If you have to interrupt your operation use the Back key.
  • Page 55 Show/clear max T Show/clear min T Calibration check Show current O reference gas value with frozen analog output Signal level display Show signal strength Error display Show unexpired error 1 Show unexpired error 2 Show unexpired error N VAISALA _______________________________________________________________________ 53...
  • Page 56 User's Guide ______________________________________________________________________ Set password Show password Change password Utility function Display Subfunction 1 Subfunction 2 Set (average) process pressure Show pressure setting Change pressure setting Set (average) water content H Show water content setting Change water content setting Set (average) CO content Show CO setting...
  • Page 57 Scale analog output Start scaling Accept function Show O equivalent to 0 Change scale or 4 mA Show O equivalent to Change scale 20 mA Test alarm relay Show relay state Change relay state Reset transmitter Reset VAISALA _______________________________________________________________________ 55...

  • Page 58: Serial Commands

    User's Guide ______________________________________________________________________ Serial Commands Serial commands are the same for both Service Interface and Customer Interface. The meaning of the command line elements is presented in the table below. Table 4 Meaning of the Command Line Elements Element Meaning Text Style Used SAMPLE Specifies the name of...

  • Page 59: List Of Serial Commands

    List of Additional Serial Commands with Password Given Serial Command Description ADJUST Locks outputs for calibration. Shows/sets CO for compensation. COXY1 Makes one-point adjustment. COXY2 Makes two-point adjustment. Shows display board status. Sets several/all environmental parameters with single command. VAISALA _______________________________________________________________________ 57...

  • Page 60: Outputting Measurement Results

    User's Guide ______________________________________________________________________ Table 7 List of Additional Serial Commands with Password Given Serial Command Description Shows error control status. ERRL Shows error log. ERRT Shows error table. FCRESTORE Restores factory calibration. Shows/sets H O for compensation. ICAL Calibrates analog output. ITEST Sets test current to analog output.

  • Page 61: Stop Continuous Output Command (S)

    UNIT : S ? min Send Measurement Results Command (SEND) This command prints out the latest result (according to FORM) in STOP mode. The command can be used with an address in POLL mode. Syntax: SEND [address]<cr> VAISALA _______________________________________________________________________ 59...

  • Page 62: Show/Set Serial Communications Mode Command

    User's Guide ______________________________________________________________________ SEND [form_string]<cr> where address = Device address form_string = Format string specifying the output format of the measurement result Example: >send 20.9 20.8 24.5 Show/Set Serial Communications Mode Command (SMODE) This command sets the serial communications mode. The command sets the serial mode of the interface that the command is issued from (Service Interface or Customer Interface).

  • Page 63: Show/Set Serial Communications Mode For Line 2 Command (Smode2)

    9600, 19200, 38400, 57600 and 115200. For Customer Interface, the maximum baud rate is 38400. NOTE The changed settings must be saved to EEPROM and the device must be reset before the new settings are taken into use. VAISALA _______________________________________________________________________ 61...

  • Page 64: >Seri

    User's Guide ______________________________________________________________________ Syntax: SERI [baud] [data] [parity] [stop]<cr> where baud = Baud rate, valid baud rates are 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 and 115200 (for Customer Interface, max. baud rate is 38400) data = Number of data bits (7 or 8) parity = Parity (n = none, e = even, o = odd) stop...

  • Page 65: Show Serial Line 1 Status Command (Sci1)

    This command displays the status of the customer serial interface object and related variables. Syntax: SCI2<cr> Example: >sci2 *** CUSTOMER INTERFACE (SCI2) ***: Mode : STOP Seri : 19200 8 NONE 1 SERI : 19200 8 NONE 1 ECHO : ON SMODE : STOP VAISALA _______________________________________________________________________ 63...

  • Page 66: Show Measurement Status Command (Mea)

    User's Guide ______________________________________________________________________ Show Measurement Status Command (MEA) This command displays the status of the measurement object and related variables. Syntax: MEA<cr> Example: >mea *** OXYGEN MEASUREMENT (MEA) *** Mode : NORMAL State : PEAK_SEARCH OP (DAC/mA) : 20960 / 1.92 Oxygen Statistics Display Function The oxygen statistics display function can be selected by pressing Ent when oxygen reading is displayed.

  • Page 67: Temperature Statistics Display Function

    Set Output Format Command (FORM) The FORM command specifies the configuration of output format for commands SEND and R. Users can modify the output format to suit their individual needs. Syntax: FORM [x]<cr> where = Format string VAISALA _______________________________________________________________________ 65...

  • Page 68: Table 8 Format String Abbreviations And Quantities

    User's Guide ______________________________________________________________________ Format string consists of quantities and modifiers. You can select one or more of the following quantities by typing the abbreviation after FORM command: Table 8 Format String Abbreviations and Quantities Abbreviation Quantity Filtered O results TGASC Gas temperature (Celsius) TGASF Gas temperature (Fahrenheit)

  • Page 69: Show/Set Date Command (Date)

    Oxygen = 21.0 Show/Set Date Command (DATE) This command sets the date. Syntax: DATE [yyyy] [mm] [dd]<cr> where yyyy = Correct year = Correct month = Correct day Example: >date YEAR 2003 ? MONTH 17 ? > VAISALA _______________________________________________________________________ 67...

  • Page 70: Show/Set Time Command (Time)

    User's Guide ______________________________________________________________________ NOTE There is no real-time clock in the device so the date set by the user resets always to 0000-01-01 at power on. Show/Set Time Command (TIME) This command displays the time elapsed since the device was last turned on.

  • Page 71: Networking Operation

    In the example, the text in italics is not echoed unless the user is using local echo. Syntax: OPEN {addr}<cr> where addr = Device address Example: >open 4 OMT300: 4 line opened for operator commands > VAISALA _______________________________________________________________________ 69...

  • Page 72: Close Serial Line In Poll Mode Command (Close)

    User's Guide ______________________________________________________________________ Close Serial Line in Poll Mode Command (CLOSE) This command closes a device and switches it into POLL mode. Unless an addressable command is issued all output is suppressed until a reset occurs or the OPEN command is used. If serial mode is set to POLL using SMODE command and the setting is saved to EEPROM (SAVE command), the device wakes up after a reset still in POLL mode and output is suppressed also on start-up.

  • Page 73: Accessing Service Level Commands

    Local Interface as well, and vice versa. When the password expires, a notification is sent once through the serial line (only in STOP mode): NOTE: PASSWORD EXPIRED VAISALA _______________________________________________________________________ 71...

  • Page 74: Issue Password Function (Pas)

    User's Guide ______________________________________________________________________ Issue Password Function (Pas) Password is required to access certain functions, such as calibration and scaling the outputs through the Local Interface. The password is four digits long ("XXXX"). When the password function Pas has been selected the digits '0000' are displayed.

  • Page 75: Analog Output Calibration

    When the scale analog output function Ascl has been selected the low end value (at 0.00/4.00 mA) is displayed, which can then be adjusted with the Up/Dn keys. The value is accepted by pressing Ent. The high end is scaled in the same way. VAISALA _______________________________________________________________________ 73...
  • Page 76 User's Guide ______________________________________________________________________ The analog output scaling mode is stopped by pressing the Back key or by time-out (five minutes). 0511-100 0511-101 0511-102 74 __________________________________________________________________ M210735EN-D...

  • Page 77: Show/Set Output Parameters Command (Out_Params)

    20 mA OUTMINO2 = Oxygen concentration OUTMINO2 (%) is set to correspond to current output 0/4 mA Analog Output Testing Set Test Current to Analog Output Command (ITEST) This command starts or stops current output test mode. VAISALA _______________________________________________________________________ 75...

  • Page 78: Test Analog Output Function (Aou)

    User's Guide ______________________________________________________________________ Syntax: ITEST [current]<cr> where current = Test current (mA) Example: >itest 4 Test current set at 4 mA. Use ITEST to stop test mode. >itest Current test mode stopped. > Test Analog Output Function (Aou) When the test analog output Aou mode has been selected the analog output displays first the existing current output and then it can be forced first to a 0.00 mA output current stage by pressing Ent.

  • Page 79: Relay Operation

    = Relay closed when measurement result is below low point low_open Relay open when measurement result is below low point Relay closed when measurement result is above high point NOTE Relay is of a non-latching type. VAISALA _______________________________________________________________________ 77...

  • Page 80: Show/Set Relay Trigger Points Command (Rsel)

    User's Guide ______________________________________________________________________ Show/Set Relay Trigger Points Command (RSEL) This command sets the relay trigger levels. Syntax: RSEL<cr> Example: >rsel LO POINT (%02) : 10.0 HI POINT (%02) : 11.0 Test Alarm Relay Function (Ala) When the test alarm relay function Ala has been selected the current status of the relay "OPE"...

  • Page 81: Device Information And Other General Commands

    This command prints out basic information about the device. Statuses of the different objects are found with the STATUS command, see Show Status of Subfunctions Command (STATUS) on page Syntax: ?<cr> Example: >? *** VAISALA OMT300 TRANSMITTER *** Device : OMT355 SW version : 1.02 SNUM...

  • Page 82: Show Measuring Parameters Command (Calcs)

    User's Guide ______________________________________________________________________ Example: >?? *** VAISALA OMT300 TRANSMITTER *** Device : OMT355 SW version : 1.02 SNUM : A1234567 Calibrated : 2005-12-24 Calib. text : Factory calibration ADDR : 91 NOTE There is a delay in the output for command ?? depending on the address assigned to the device.

  • Page 83: Show Display Board Status Command (Db)

    List Commands Command (HELP) Without a parameter this command prints out a list of valid commands with the current password level. Giving a command name as a parameter prints out a more detailed description of the command. VAISALA _______________________________________________________________________ 81...

  • Page 84: Show Laser Temperature Controller Status Command

    User's Guide ______________________________________________________________________ Syntax: HELP [command]<cr> where command = Command name Example: >help Prints information about the device Prints information even in POLL mode > Show Laser Temperature Controller Status Command (LTC) This command displays the status of the laser temperature controller object and related variables.

  • Page 85: Show All Modifiable Parameter Values (Param)

    SMODE : STOP Common Serial parameters--------- ADDR INTV : 1 S FORM : F0 Analog Output--------------------- OUTMINO2 (%) : 0.000 OUTMAXO2 (%) : 25.000 NONFATALI (mA) : 3.000 FATALI (mA) : 3.000 Relay Output---------------------- RELAY_MODE : FAULT_ALARM VAISALA _______________________________________________________________________ 83...

  • Page 86: Measure Signal Level Command (Sil)

    User's Guide ______________________________________________________________________ LO POINT (%02) : 10.0 HI POINT (%02) : 11.0 Measurement parameters------------ INSTALLATION : Process measurement PRESSURE(bar) : 1.000 H2O (g/m3) : 50 CO2 (vol-%) : 20 Measure Signal Level Command (SIL) Test signal level. This command compares the laser signal strength to its original strength.

  • Page 87: Show Statistical Information Command (Stats)

    *** OXYGEN MEASUREMENT (MEA) *** Mode : MODE2 State : PEAK_LOCKED Run Time Func. : OFF *** ANALOG OUTPUT (OUT) *** Mode : NORMAL State : NORMAL *** ERROR CONTROL (ERR) *** Mode : ON State : NO ERRORS VAISALA _______________________________________________________________________ 85...

  • Page 88: Show Product Name And Software Version Command

    User's Guide ______________________________________________________________________ *** CUSTOMER INTERFACE (SCI2) ***: Mode : STOP *** SERVICE INTERFACE (SCI1) ***: Mode : STOP *** DISPLAY BOARD (DB) *** Mode : NORMAL State : NORMAL > Show Product Name and Software Version Command (VERS) This command prints out the device name and the software version. Syntax: VERS<cr>...

  • Page 89: Resetting The Transmitter

    Example: >reset Reseting... OMT300 - Version STD 1.02 Vaisala Oyj, 2004-2005 Reset Function (Off) When the reset function Off is selected the transmitter stops all operations and performs a reset. To reset the transmitter, select function Off from the menu and press Ent. The text "OFF" starts to blink on the display.
  • Page 90 User's Guide ______________________________________________________________________ 88 __________________________________________________________________ M210735EN-D...

  • Page 91: Setting Environmental Parameters

    (when using the factory defaults, the other compensations are essentially disabled). The default environmental parameters of OMT355 are: VAISALA _______________________________________________________________________ 89...

  • Page 92: Operating Temperature

    User's Guide ______________________________________________________________________ Pressure 1013.25 hPa Water content 0 g/m Relative carbon dioxide concentration 0 vol-% CO Operating Temperature The device measures both its internal temperature and the temperature of the process gas and these are used to compensate the oxygen measurement reading.

  • Page 93: Figure 23 Effect Of Process Pressure Compensation

    Figure 23 on page 91 along the x-axis. That is, even with the compensation enabled, changes in pressure from the compensation value have a more significant effect than at normal atmospheric pressure. VAISALA _______________________________________________________________________ 91...

  • Page 94: Show/Set Pressure For Compensation Command

    User's Guide ______________________________________________________________________ NOTE If the pressure compensation is enabled, and then the transmitter is removed from the process to be calibrated and adjusted somewhere else, you have to set the pressure according to the adjustment environment. The pressure setting then has to be changed back to represent the operating conditions when the transmitter is reinstalled to the process.

  • Page 95: Set Pressure For Compensation Command (Xpres)

    Up/Dn keys. The accepted range is 0.800 ... 1.400 bar . The new pressure setting is accepted by pressing Ent. The text "PASS" is displayed when the setting is in the accepted range. 0511-083 0511-086 VAISALA _______________________________________________________________________ 93...

  • Page 96: Background Gas Effects

    User's Guide ______________________________________________________________________ Background Gas Effects General Information About Background Gas Effects Individual absorption line widths of O gas are sensitive to intermolecular collisions between O and background gas molecules. This has an effect on the O reading of the transmitter. The magnitude of this effect depends on the amount and type of background molecules.

  • Page 97: Water Content Of Background Gas

    28.59051 8.2log – 0.0024804 – 3142 1000 10 0511-061 where As given above Example: The gas temperature is 40°C and the relative humidity is 90%. The absolute humidity in g/m is calculated from the above data as follows: VAISALA _______________________________________________________________________ 95...

  • Page 98: Table 10 Conversion Table From T And Rh To Absolute Humidity And The Effect Of Humidity On Transmitter Reading

    User's Guide ______________________________________________________________________ First, calculate the water vapor pressure P (hPa) = P (40 °C) × 90/100 = 66.5 Then, use this result to calculate the absolute humidity: O (g/m ) = 216.679 × 66.5 / (273.15 + 40 °C) = 46.0 Table 10 on page 96 lists some conversions from T and RH to absolute humidity for quick reference use.

  • Page 99: Set Water Content For Compensation Command (H2O)

    Set water content for compensation. The setting will be stored in EEPROM by SAVE command. The accepted range is 0 ... 600 g/ Syntax: H2O [water]<cr> where water = Water content in measured gas (g/m Example: >H2O 100 WATER(g/m3) : 100 VAISALA _______________________________________________________________________ 97...

  • Page 100: Set (Average) Water Content Function (H2O)

    User's Guide ______________________________________________________________________ Set (Average) Water Content Function (H2O) When the set (average) water content function H2O has been selected 000 (g/m O) is displayed as a default value (first time). The water content value is changed by using the Up/Dn keys. The accepted range is 0 ...

  • Page 101: Set Carbon Dioxide Content For Compensation Command (Co2)

    Up/Dn keys. The accepted range is 0 ... 100 vol-% CO . The new CO content setting is accepted by pressing Ent. The text "PASS" is displayed when the setting is in the accepted range. 0511-087 0511-088 VAISALA _______________________________________________________________________ 99...

  • Page 102: Setting Several/All Environmental Parameters With Single Command (Env)

    User's Guide ______________________________________________________________________ Setting Several/All Environmental Parameters with Single Command (ENV) This command sets several or all environmental parameters. After familiarizing yourself with the effect environmental parameters have on oxygen measurement, the ENV command is a convenient way of setting several or all of the available environmental parameters to the transmitter memory at once.

  • Page 103: Calibration And Adjustment (In-Line And Sampling Cell Versions Of Omt355)

    Read the instructions through carefully before making any adjustments or parameter changes. Vaisala accepts no responsibility for parameter or settings changes nor adjustments made by the user. When you require technical support or assistance, please contact Vaisala Technical...

  • Page 104: Hardware Arrangements For Calibration And Adjustment

    User's Guide ______________________________________________________________________ Hardware Arrangements for Calibration and Adjustment Getting Started Calibration can be done simply by observing the measurement reading of the transmitter. Before calibration or adjustment the transmitter should be on for at least 15 minutes. Adjustment requires user access to serial line or local keypad interface: Open the back cover of the transmitter with a 4 mm hex socket (Allen) key.

  • Page 105: Using Bottled Gas And Calibration Chamber

    (in the range 0 ... 20 m/s) on adjustment accuracy is negligible. With flow rates well below 5 l/min calibration uncertainty grows and high process gas velocity has an adverse effect on adjustment accuracy. This is because diffusion through the oxygen measurement probe filter VAISALA ______________________________________________________________________ 103...

  • Page 106: Connections And Systems

    User's Guide ______________________________________________________________________ causes a small error in reference gas concentration. For example, with a reference gas flow rate of 2 l/min and process gas velocity of 20 m/s, adjustment accuracy is significantly worse than ±0.2 %O The amount of unwanted counter diffusion through the filter depends on the O concentration difference between the reference gas and the process gas.

  • Page 107: Adjusting Gas Flow

    In case you do not have access to a flow-control device, you can refer Figure 25 on page 106 for information on the flow rate in relation to reference gas pressure given by the back pressure valve of the optional calibration gas inlet of OMT355. VAISALA ______________________________________________________________________ 105...

  • Page 108: Information On Calibration Gases

    User's Guide ______________________________________________________________________ 0511-052 Figure 25 Flow Rate vs. Pressure, Back Pressure Valve Swagelok SS-CHSM2-KZ-25 Information on Calibration Gases The factory calibration of OMT355 is carried out using dry N and O mixtures. Humidity and CO concentration of the calibration gases are 0 %.

  • Page 109: Calibration

    It gives an example of readings when measuring humid gases with no RH corrections given to the OMT355 transmitter (that is, RH is set as 0%RH). Both gas dilution effect and RH dependency effect are included in the chart. VAISALA ______________________________________________________________________ 107...

  • Page 110: Using Calibration Gases

    Figure 26 Oxygen Readings in Relative Humidity Using Calibration Gases For simple calibration of the in-line and sampling versions of OMT355, Vaisala recommends using normal ambient air, see Using Ambient Air on page 107. If a calibration gas (like synthetic air or precision O...

  • Page 111: Calibration Check Function (Cal.c)

    If there are any errors active in the device, adjustment might fail at any point during the procedure. Therefore it is recommended that you clear all errors before attempting any adjustments. For instructions on clearing nonfatal errors and warnings, see section Error Display on page 151. VAISALA ______________________________________________________________________ 109...

  • Page 112: Possible Adjustments

    User's Guide ______________________________________________________________________ NOTE Make sure that environmental parameters are set according to the adjustment environment before attempting any adjustments. Set the pressure, humidity, and CO concentration values of the calibration gas. Typically the humidity of the calibration gases is 0 g/m O.

  • Page 113: One-Point Adjustment Procedure Using Serial Line

    If the device is removed from the process or disconnected from process controls during adjustment, this step can be omitted. VAISALA ______________________________________________________________________ 111...
  • Page 114 User's Guide ______________________________________________________________________ >adjust on Outputs (analog, relay, POLL/Run and MT300) frozen If the adjustment conditions (gas pressure, humidity, and CO concentration) are different from the operating conditions of the transmitter, you have to set the environmental parameters of the adjustment environment to the transmitter for the duration of the adjustment.

  • Page 115: One-Point Adjustment Using Local Interface

    101, mainly in sections Connections and Systems on page 104, Connecting the Gas on page 104 One-Point Adjustment Procedure Using Local Interface on page 114. Adjustment can be interrupted at any time by pressing the Back key. VAISALA ______________________________________________________________________ 113...

  • Page 116: One-Point Adjustment Procedure Using Local

    User's Guide ______________________________________________________________________ 0511-089 0511-090 One-Point Adjustment Procedure Using Local Interface Depending on the reference concentration used, this adjustment changes the gain or offset parameter value. At oxygen concentrations below 10.5 %O , the offset value is changed, and above 10.5 %O gain value is changed.

  • Page 117: Two-Point Adjustment Using Serial Line

    Connect ref gas #1 to cuvette. O2 (%): 20.99 Ref1 ? 21 Connect ref gas #2 to cuvette. O2 (%): 10.05 Ref2 ? 10 Calibration data: Pressure setting (bar) : 1.013 Point #1 Measured oxygen : 20.99 Given oxygen : 21.00 VAISALA ______________________________________________________________________ 115...

  • Page 118: Two-Point Adjustment Procedure Using Serial Line

    User's Guide ______________________________________________________________________ Gas temperature (C) : 23.65 Ref path temperature (C): 24.84 Point #2 Measured oxygen : 10.05 Given oxygen : 10.00 Gas temperature (C) : 23.66 Ref path temperature (C): 24.85 New Gain : 0.995 New Offset : 0.990 Calibration ready - remember SAVE command Two-Point Adjustment Procedure Using Serial Line As a result of this adjustment, new gain and offset parameter values are...
  • Page 119 Type the gas concentration for the second reference and press Enter. New gain and offset parameter values are now calculated and displayed. The output: O2 (%): 10.05 Ref2 O2 (%): 10.05 Ref2 O2 (%): 10.05 Ref2 O2 (%): 10.05 Ref2 ? 10 VAISALA ______________________________________________________________________ 117...
  • Page 120 User's Guide ______________________________________________________________________ Calibration data: Pressure setting (bar) : 1.013 Point #1 Measured oxygen : 20.99 Given oxygen : 21.00 Gas temperature (C) : 23.65 Ref path temperature (C): 24.84 Point #2 Measured oxygen : 10.05 Given oxygen : 10.00 Gas temperature (C) : 23.66 Ref path temperature (C): 24.85...

  • Page 121: Two-Point Adjustment Using Local Interface

    These can be, for example pure nitrogen (0.0 %O ) and an N mixture (for example, 21 %O ). The minimum difference between the two reference gas concentrations in two-point adjustment should be at least 4 %O VAISALA ______________________________________________________________________ 119...
  • Page 122 User's Guide ______________________________________________________________________ Select Pass from the menu and give the password. After the password is given, more options appear in the menu. If the adjustment conditions (gas pressure, humidity, and CO concentration) are different from the operating conditions of the transmitter, you have to set the environmental parameters of the adjustment environment to the transmitter for the duration of the adjustment.

  • Page 123: Restoring Factory Calibration

    Fac (password required) and press Ent twice. The text "PASS" is displayed when the operation is successful. 0511-099 NOTE Issuing command FCRESTORE or selecting Fac sets parameters gain = 1 and offset = 0. VAISALA ______________________________________________________________________ 121...
  • Page 124 User's Guide ______________________________________________________________________ 122 _________________________________________________________________ M210735EN-D...

  • Page 125: Calibration And Adjustment (Ambient Gas Measurement Version Of Omt355)

    Read the instructions through carefully before making any adjustments or parameter changes. Vaisala accepts no responsibility for parameter or settings changes nor adjustments made by the user. When you require technical support or assistance, please contact Vaisala Technical...

  • Page 126: Hardware Arrangements For Calibration And Adjustment

    Therefore Vaisala recommends the following procedures which provide a simpler approach: - For calibration (checking of the device): use normal ambient air or 21.0 %O...

  • Page 127: Gas Feed Setup For Calibration And Adjustment

    If calibration or adjustment gas concentrations significantly different from ambient air are used, it should be noted that: For calibration (checking of the device), it is possible to correct the transmitter reading for the error that is caused by the calibration VAISALA ______________________________________________________________________ 125...

  • Page 128: Calibration

    User's Guide ______________________________________________________________________ setup (calibration gas not fed into the transmitter housing), see chapter Using Calibration Gas on page 127. For adjustment, needed arrangements should be carried out to have the adjustment gas concentration present in the transmitter housing, also. 0511-053 Figure 27 Attaching OMT355 Probe into Sample Cell...

  • Page 129: Using Calibration Gas

    Figure 28 Oxygen Readings in Alternating Humidity Using Calibration Gas For simple calibration of the ambient measurement version of OMT355, Vaisala recommends using normal ambient air, see Using Ambient Air on page 126. If a calibration gas (like synthetic air or precision O...

  • Page 130: Figure 29 Calibration Gas O2 Concentration Readings For Ambient Gas Measurement Version Of Omt355

    User's Guide ______________________________________________________________________ gas arrangement, the correct reading for the ambient measurement version of OMT355 can be seen from the chart in Figure 29 on page 128. The figure shows the readings of the ambient gas measurement version of OMT355 when calibration gas is fed only to the sample cell (that is, transmitter housing is not in the calibration gas environment).

  • Page 131: Information On Calibration Gases

    This command can be used for checking the calibration against a known reference gas, or during on-line adjustment, so process control is not disturbed by the changing readings. Syntax: ADJUST [on/off]<cr> Example: >adjust on Outputs (analog, relay, POLL/Run and MT300) frozen VAISALA ______________________________________________________________________ 129...

  • Page 132: Calibration Check Function (Cal.c)

    Ent. 0511-074 0511-075 Adjustment For ambient measurement version of OMT355 Vaisala recommends a one point adjustment with a dry O gas mixture with an O concentration of about 21 %O The ambient measurement version of OMT355 requires the adjustment gas concentration to be present in the probe and inside the transmitter housing.

  • Page 133: Possible Adjustments For Ambient Measurement Version

    If the given reference gas O concentration is >10.5 %O , the result of one-point adjustment is a new gain value, otherwise the result is a new offset value. The result of two-point adjustment would be both new gain and offset values. VAISALA ______________________________________________________________________ 131...

  • Page 134: One-Point Adjustment Using Serial Line

    User's Guide ______________________________________________________________________ One-Point Adjustment Using Serial Line One-Point Adjustment Command (COXY1) This command is used to make a one-point adjustment. While the program is waiting for O concentration to be given, it is possible to issue command R after which the program will continuously print out the current O reading.

  • Page 135: One-Point Adjustment Procedure Using Serial Line

    Press Enter again to stop printing results. Esc - Abort the calibration. Observe when the reading has stabilized. Type the reference gas concentration and press Enter. A new gain or offset parameter value is now calculated and displayed. VAISALA ______________________________________________________________________ 133...
  • Page 136 User's Guide ______________________________________________________________________ The output after giving the COXY1 command: >coxy1 Customer calibration Current condition/settings: Pressure (bar) : 1.013 H2O (g/m3) CO2 (vol-%) Gas temperature (C) : 23.64 Internal temperature (C): 24.84 If parameters are not correct, cancel calibration by ESC and change parameters.

  • Page 137: One-Point Adjustment Using Local Interface

    If the adjustment conditions (gas pressure, humidity, and CO concentration) are different from the operating conditions of the transmitter, you have to set the environmental parameters of the adjustment environment to the transmitter for the duration of the VAISALA ______________________________________________________________________ 135...

  • Page 138: Restoring Factory Calibration

    User's Guide ______________________________________________________________________ adjustment. These settings must then be changed back to represent the process conditions when the transmitter is reinstalled in its operating environment. For more information on setting environmental parameters to OMT355, see Chapter 6, Setting Environmental Parameters, on page Select Cal1 from the menu.

  • Page 139: Restore Factory Calibration Function (Fac)

    Fac (password required) and press Ent twice. The text "PASS" is displayed when the operation is successful. 0511-099 NOTE Issuing command FCRESTORE or selecting Fac sets parameters gain = 1 and offset = 0. VAISALA ______________________________________________________________________ 137...
  • Page 140 User's Guide ______________________________________________________________________ 138 _________________________________________________________________ M210735EN-D...

  • Page 141: Maintenance

    You can check the signal level through the serial or local interface, see Measure Signal Level Command (SIL) on page 84 Signal Level Display Function (Sil) on page VAISALA ______________________________________________________________________ 139...

  • Page 142: Using Solvents To Clean The Optics

    User's Guide ______________________________________________________________________ CAUTION Beware of high concentrations of O : they strongly promote combustion and may react violently with combustible substances. When measuring high O concentrations, make sure the entire probe is clean before reinserting the transmitter. Using Solvents to Clean the Optics When using solvents to clean the optics, make sure the solvent used is compatible with the sealing material used in the transmitter.

  • Page 143: Cleaning The Lens

    140). Be careful while pouring out the excess liquid so that the optical surface not being cleaned does not get wet. Replace the filters after cleaning. CAUTION Physical cleaning (rubbing) of the lens with , for example, a cotton stick is not permitted. VAISALA ______________________________________________________________________ 141...

  • Page 144: Replacing Consumables

    User's Guide ______________________________________________________________________ Replacing Consumables OMT355 Filters 0511-056 Figure 32 Stainless Steel Mesh and PTFE Filters To avoid contamination, handle the PTFE filter only by the solid part at the open end of the filter or by the closed tip and the very edges of the closed end of the filter (these areas are inactive once the filter is installed on the probe).

  • Page 145: Changing The Ptfe Filter

    (if necessary) by pressing with your fingers at the closed tip of the filter. VAISALA ______________________________________________________________________ 143...

  • Page 146: Spare Parts And Accessories

    User's Guide ______________________________________________________________________ NOTE It can be awkward to remove the PTFE filter from the mesh filter. They tend to come off the transmitter together. Spare Parts and Accessories Table 11 Available Spare Parts and Accessories Spare Part Order Code Stainless steel net 216615 PTFE filter with EPDM O-ring...

  • Page 147: Chapter 10 Troubleshooting

    During start-up, the transmitter runs a self-test, which is used to check several things concerning functions of the transmitter electronics and measurement signals. Example of the transmitter self-test output: OMT300 - Version STD 1.08 Vaisala Oyj, 2004-2006 > ----------------------------- SELF TEST STARTS Voltages:...

  • Page 148: Error Detection During Operation

    User's Guide ______________________________________________________________________ Peltier Driver: Laser current: Signal from sensor: Gain and offset controls: OK SELF TEST ENDS ----------------------------- ERR EVENT:ACT 37:NO MEASUREMENT RESULTS > ERR EVENT:ACT 33:LASER TEMPERATURE NOT REACHED > ERR EVENT:DEACT33:LASER TEMPERATURE NOT REACHED > ERR EVENT:DEACT37:NO MEASUREMENT RESULTS >...

  • Page 149: Error Control And Error Categories

    Actions When Fatal Error Has Been Detected Analog output Programmable, default = 3 mA Red LED is blinking fast Relay Open Display Error codes are displayed Service Interface STOP-MODE: Send error message RUN-MODE: O2 value = ***.** POLL-MODE: O2 value = ***.** VAISALA ______________________________________________________________________ 147...

  • Page 150: Nonfatal Errors

    User's Guide ______________________________________________________________________ Table 12 Actions When Fatal Error Has Been Detected Customer Interface STOP-MODE: Send error message RUN-MODE: O2 value = ***.** POLL-MODE: O2 value = ***.** Error counter Error counter(s) increased Error log Error is written to log Nonfatal Errors The table below lists the different transmitter outputs when nonfatal error has been detected.

  • Page 151: Emergency Shutdown State

    Show Error Control Status (ERR) This command displays the status of the error control object and active errors. Syntax: ERR<cr> Example: >err *** ERROR CONTROL (ERR) *** Mode : ON State : WARNING ERRORS: WARNING : WATCHDOG RESET OCCURRED > VAISALA ______________________________________________________________________ 149...

  • Page 152: Show Error Log (Errl)

    User's Guide ______________________________________________________________________ Show Error Log (ERRL) This command displays the events in the error log. Syntax: ERRL<cr> Example: >errl T(h)T(ms)EventError 3043991ACT NO MEASUREMENT RESULTS 30461191ACT LASER TEMPERATURE NOT REACHED 30478691DEACTLASER TEMPERATURE NOT REACHED 30499091DEACTDEACTNO MEASUREMENT RESULTS > Show Detected Errors (ERRS) This command displays all errors currently active in the device.

  • Page 153: Error Display

    EEPROM OPERATION PARAMS NOT AVAILABLE FATAL LASER CURRENT OUT OF RANGE FATAL SIGNAL LEVEL HIGH FATAL LASER TEMPERATURE SENSOR FAILURE FATAL GAS 1 TEMPERATURE SENSOR FAILURE FATAL GAS 2 TEMPERATURE SENSOR FAILURE FATAL IO-EXPANDER CONNECTION FATAL LCD-DRIVER CONNECTION FATAL ADC2 VAISALA ______________________________________________________________________ 151...

  • Page 154: Technical Support

    Read the warranty information. Contact Vaisala Service Centers, preferably by e-mail or fax and request for instructions (see contact information on next page). Please include a problem report describing the problem.

  • Page 155: Vaisala Service Centers

    Chapter 10 __________________________________________________________ Troubleshooting Vaisala Service Centers Vaisala Service Centers perform calibrations and adjustments as well as ® repair and spare part services. Vaisala SPECTRACAP Oxygen Transmitter OMT355 maintenance is performed by the European Service Center: European Service Center Vaisala Instruments Service, Vanha Nurmijärventie 21 FIN-01670...
  • Page 156 User's Guide ______________________________________________________________________ 154 _________________________________________________________________ M210735EN-D...

  • Page 157: Chapter 11 Technical Data

    -2 ... 0 % of reading (0.8 ... 1.2 bar compensation is disabled -5 ... 0 % of reading (0.8 ... 1.4 bar Operating pressure range 0.8 ... 1.4 bar Power up time 2.5 min Warm-up time (to full specification) 3 min VAISALA ______________________________________________________________________ 155...

  • Page 158: Table 18 Background Gas Effect

    User's Guide ______________________________________________________________________ Table 18 Background Gas Effect Property Description / Value The effect of CO (0 ... 50 vol-%CO on the O reading -0.15 % of reading / vol-% CO if compensation is disabled ±0.5 % of reading if compensation is enabled The effect of humidity (g/m the O reading...

  • Page 159: Table 21 Approvals And Fulfilled Standards

    Requirements and tests for apparatus using software and/or digital technologies. WARNING OMT355 is NOT designed or approved for EX applications. Use of OMT355 in potentially explosive atmospheres is not permitted. In the above standards, approval of OMT355 refers to measurement of oxygen only. VAISALA ______________________________________________________________________ 157...

  • Page 160: Table 22 Dimensions And Mechanics

    User's Guide ______________________________________________________________________ Table 22 Dimensions and Mechanics Property Description / Value Dimensions (h × w × d) 306 × 184 × 74 mm Weight 2.2 kg Housing material G-AlSi10Mg (DIN 1725) Housing classification IP66 Flange diameter 96 mm Can be attached to DIN/ANSI standard flanges.

  • Page 161: Flange Preparation Instructions

    Appendix A ______________________________________________ Flange Preparation Instructions APPENDIX A FLANGE PREPARATION INSTRUCTIONS VAISALA ______________________________________________________________________ 159...
  • Page 162 User's Guide ______________________________________________________________________ 0511-057 160 _________________________________________________________________ M210735EN-D...

  • Page 163: Humidity Conversion Table

    Appendix B _________________________________________________ Humidity Conversion Table APPENDIX B HUMIDITY CONVERSION TABLE 0511-058 VAISALA ______________________________________________________________________ 161...
  • Page 164 User's Guide ______________________________________________________________________ 162 _________________________________________________________________ M210735EN-D...
  • Page 165 *M210735EN*...

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