Vaisala PTB220 Series User Manual
  1. Manuals
  2. Brands
  3. Vaisala Manuals
  4. Test Equipment
  5. PTB220 Series
  6. User manual

Vaisala PTB220 Series User Manual

Digital barometers
Hide thumbs
Table of Contents

Advertisement

Quick Links

PTB220 Series Digital
Barometers
U
'
G
SER
S
UIDE
M210194
-A
EN
2001
AUGUST

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the PTB220 Series and is the answer not in the manual?

Questions and answers

Related Manuals for Vaisala PTB220 Series

Summary of Contents for Vaisala PTB220 Series

  • Page 1 PTB220 Series Digital Barometers UIDE M210194 2001 AUGUST...

  • Page 3: Table Of Contents

    _________________________________________________________________________C ONTENTS Table of contents CHAPTER 1 GENERAL INFORMATION.............1 Safety ....................1 Warranty ..................2 CHAPTER 2 PRODUCT DESCRIPTION .............3 Introduction ..................3 BAROCAP ® pressure sensor ............4 Measurement principle..............6 Block diagram ................7 CHAPTER 3 GETTING STARTED ...............9 CHAPTER 4 COMMISSIONING .................11 Operating modes .................12 SMODE Selecting the sending mode ........12 MMODE Selecting the measurement mode......13 PULSE Selecting the PULSE output mode ......14...
  • Page 4 _______________________________________________________________________ UIDE TRACK Setting the pressure tracking mode on/off....46 PLIM Pressure limit listing............46 RESET Resetting the barometer ..........47 POLL mode .................. 48 SEND Outputting one single message ........48 OPEN Setting a barometer from POLL mode to STOP mode. 49 CLOSE Setting a barometer from STOP mode to POLL mode49 SEND mode..................
  • Page 5 _________________________________________________________________________C ONTENTS APPENDIX F MULTIPLE PTB220 BAROMETERS ON RS232C.......91 APPENDIX G OPTIONAL RS485/422 INTERFACE OF PTB220 BAROMETERS93 APPENDIX H SERIAL INTERFACE COMMANDS ..........97 Commissioning commands............97 Operating commands..............97 Maintenance commands .............98 Diagnostic commands ..............98 APPENDIX I CHECKSUM ..................99 APPENDIX J PRESSURE TENDENCY ............101 APPENDIX K ERROR MESSAGES..............102 APPENDIX L SPECIAL EMULATION MODE ...........103...

  • Page 7: Chapter 1 General Information

    1_______________________________________________________ G HAPTER ENERAL NFORMATION GENERAL INFORMATION CHAPTER 1 Safety Throughout the manual important instructions regarding the safety considerations are focused as follows. WARNING Warning denotes a hazard. It calls attention to a procedure, practice, condition or the like, which, if not correctly performed or adhered to, could result in injury to or death of personnel.

  • Page 8: Warranty

    The working hours used by employees of Vaisala for such repair or replacement shall be free of charge to the client. This service warranty shall be valid for a period of six (6) months from the date the service measures were completed.

  • Page 9: Chapter 2 Product Description

    Vaisala for barometric pressure measurement applications. The measurement principle of the PTB220 series digital barometers is based on an advanced RC oscillator and three reference capacitors against which the capacitive pressure sensor and the capacitive temperature compensation sensor are continuously measured.

  • Page 10: Barocap Pressure Sensor

    _______________________________________________________________________ UIDE The PTB220 series digital barometers are available with one, two or three pressure transducers. Although one pressure transducer is usually the most appropriate configuration, some applications may benefit from additional pressure transducers. Two or three pressure transducers provide for a self-diagnostic feature: the user can set an alarm limit within which the pressure transducers must agree for reliable measurement.
  • Page 11 2___________________________________________________ PRODUCT DESCRIPTION HAPTER Silicon diaphragm Thin film metallization Silicon Glass Silicon Vacuum gap ® The BAROCAP pressure sensor IGURE The BAROCAP ® pressure sensor consists of two layers of single crystal silicon having a layer of glass between them. The thinner silicon layer is etched on both sides to create an integrated vacuum reference chamber for the absolute pressure sensor and to form a pressure sensitive silicon diaphragm.

  • Page 12: Measurement Principle

    _______________________________________________________________________ UIDE Measurement principle The measurement principle of the PTB220 series digital barometers is based on an advanced RC oscillator with three reference capacitors against which the capacitive pressure sensor and the capacitive temperature compensation sensor are continuously measured. A...

  • Page 13: Block Diagram

    2___________________________________________________ PRODUCT DESCRIPTION HAPTER Block diagram The PTB220 series digital barometers consist of a CPU board and 1, 2 or 3 pressure transducers (P1, P2 and P3). The number of pressure transducers is order specific and the configuration cannot be changed by the user.

  • Page 15: Chapter 3 Getting Started

    ETTING STARTED GETTING STARTED CHAPTER 3 As the PTB220 series digital barometers always have an RS 232C serial interface, the user is requested to use this interface when operating the barometer for the first time. The RS 232C is the most useful and reliable interface for commissioning the barometers with various software settings.
  • Page 16 _______________________________________________________________________ UIDE The factory settings of the PTB220 series barometers are the following: Serial interface factory settings ABLE Baud rate 9600 Parity even Data bits Stop bits Duplex full duplex After having made the electrical connections, switch the power on, and the barometer responds indicating the barometer type and the software version.

  • Page 17: Chapter 4 Commissioning

    4_____________________________________________________________ HAPTER COMMISSIONING COMMISSIONING CHAPTER 4 summarizes the commands used to commission the PTB220 ABLE series digital barometers. The commands are not case sensitive except for the SCOM command. Commissioning commands ABLE Function Command sending mode SMODE measurement mode MMODE pulse mode settings PULSE serial bus settings...

  • Page 18: Operating Modes

    = STOP, RUN, SEND or POLL The SMODE command is used to set or inspect the sending mode of the barometer. The PTB220 series digital barometers have four sending modes: STOP, RUN, SEND and POLL. In STOP mode (see page 43), after power-up the barometer outputs its type and software version and then waits for further commands.

  • Page 19: Mmode Selecting The Measurement Mode

    (see page 6). This is the standard operating mode of the PTB220 series digital barometers. In the fast measurement mode, the barometer measures mainly the ...

  • Page 20: Pulse Selecting The Pulse Output Mode

    The MTIM and FILT commands are used only together with the MMODE FAST command. In the NORMAL measurement mode, the AVRG command replaces the MTIM and FILT commands in the PTB220 series digital barometers. NOTE Always remember to return the switch SW4 to write DISABLE position (OFF).
  • Page 21 PTB220 series digital barometers. NOTE In case of an error in a PTB220 series barometer, there will be no pulse output from the barometer despite an external trigger pulse. This error handling technique ensures that a host system cannot receive erroneous pressure readings from a PTB220 series barometer.

  • Page 22: Software Settings

    _______________________________________________________________________ UIDE Software settings SERI Serial bus settings SERI b p d s x <cr> where: (* = factory setting) baud rate (300, 600, 1200, 2400, 4800, 9600*) parity (E = even*, O = odd, N = none) data bits (7* or 8) stop bits (1* or 2) duplex (F = full* or H = half) <cr>...

  • Page 23: Echo Setting The Serial Bus Echo On/Off

    4_____________________________________________________________ HAPTER COMMISSIONING The RS485/422 interface of the PTB220 series digital barometers is a non-isolated two-wire half-duplex interface. See page 93 for quick reference information on how to use the RS485/422 interface of the PTB220 series digital barometers. ECHO Setting the serial bus echo on/off ECHO x <cr>...
  • Page 24 _______________________________________________________________________ UIDE pressure quantities P1 (reading of the transducer 1), P2 (transducer 2), P3 (transducer 3), P (average) height corrected pressure HCP (see also page 25) pressure trend *) TREND (three-hour trend) pressure tendency A (see page 101 for details) temperature quantities *) T1, T2, T3 pressure and temperature units...
  • Page 25 4_____________________________________________________________ HAPTER COMMISSIONING Examples of different ways of setting the output format: 1. To output the pressure reading. >form <cr> 4.2 P " " UUUU #r #n ? <cr> >send <cr> 1020.30 hPa > 2. To output the transducer values (P1,P2,P3) separately and the average value (P).
  • Page 26 _______________________________________________________________________ UIDE 6. To output the average pressure reading in the units of inHg . >form <cr> 4.2 P " " UUU #r #n ? 2.4 P " " UUUU #r #n <cr> >unit inHg <cr> P unit : inHg >send <cr>...
  • Page 27 4_____________________________________________________________ HAPTER COMMISSIONING >form <cr> 4.2 P " " UUUU #r #n ? 4.2 P1 " " P2 " " P3 " " P " " UUU " " ERR #r #n <cr> >send <cr> 1020.30 1020.31 1020.32 1020.31 hPa 000 >send <cr>...

  • Page 28: Eform Defining The Error Output Format

    _______________________________________________________________________ UIDE EFORM Defining the error output format EFORM <cr> The EFORM command is used to define the user specific error output format for the serial interface. In case of an internal error, the barometer outputs the message defined with the EFORM command instead of the normal message defined with the FORM command.
  • Page 29 4_____________________________________________________________ HAPTER COMMISSIONING *) The PTB220 barometer cannot output + sign for pressure trend or temperature reading; a space is output instead. There are two rows containing 16 characters each; the user can define a maximum of 32 characters to be displayed. The field definitions are defined in successive order so that the first 16 characters will be displayed on the first row and the next characters on the second row.
  • Page 30 _______________________________________________________________________ UIDE The PTB220 series barometers will show * instead of numeric values for pressure trend and pressure tendency for three hours from power- In case of error in the barometer, the relevant error message will automatically appear on the second line of the display. In this case, any other information defined using the DFORM command will be replaced with an error message.

  • Page 31: Unit Setting The Pressure And Temperature Units

    4_____________________________________________________________ HAPTER COMMISSIONING UNIT Setting the pressure and temperature units UNIT x <cr> where (* = factory setting) hPa* mbar inHg mmHg torr psia This command is used to set and inspect the pressure and internal temperature compensation unit. The temperature unit is not confirmed by the barometer.

  • Page 32: Avrg Setting The Averaging Time

    _______________________________________________________________________ UIDE where: measured pressure 0.1176 = constant height Example of setting the height: >hhcp<cr> Height of HCP : ? -30 > AVRG Setting the averaging time AVRG x <cr> where: x = 1 ... 600 (seconds) The AVRG command is used to set and inspect the averaging time during which the individual measurement samples are integrated to get an averaged pressure reading.

  • Page 33: Intv Setting The Output Interval

    POLL mode (see Chapter POLL mode). The address feature is important when multiple PTB220 series barometers are connected to one RS232C interface (see page 91), or when a PTB220 series barometer is used on an RS485/422 serial interface (see page 93).

  • Page 34: Scom User Specific Send Command

    _______________________________________________________________________ UIDE >addr 7 <cr> Address > A new address replaces the previous one. Always set the address to 0 when no address is needed: >addr 0 <cr> Address > If the barometer is not closed in the POLL mode, it will respond to any SEND command (regardless of the address).

  • Page 35: Pstab Setting The Pressure Stability Indicator

    4_____________________________________________________________ HAPTER COMMISSIONING Example of defining a similar command without an end character: >scom <cr> "P" #r ? "P" <cr> >P1020.30 hPa > Any previous SCOM definition may be removed with the following command: >scom * <cr> > PSTAB Setting the pressure stability indicator PSTAB x <cr>...

  • Page 36: Plarm Setting The Pressure Alarm Levels

    _______________________________________________________________________ UIDE fluctuations, and for example opening the door of a room will often result in temporary pressure instability. PLARM Setting the pressure alarm levels PLARM x y <cr> where: x = the low alarm level (LO ALARM) y = the high alarm level (HI ALARM) The PLARM command is used to set or inspect the low and high pressure alarm levels.
  • Page 37 It is recommended to use the ERR field as part of the FORM command definition, if there are two or three pressure transducers in a PTB220 series digital barometer. More than one ´1´ in the ERR field indicates that the pressure reading output of the barometer is not reliable.

  • Page 38: Keylock Setting The Keyboard Lock On/Off

    _______________________________________________________________________ UIDE > >form <cr> 4.2 P " " UUUU #r #n ? 4.2 P1 " " P2 " " P3 " " P " " UUU " " ERR #r #n <cr> >send <cr> 1020.30 1020.31 1020.32 1020.31 hPa 000 >send <cr>...

  • Page 39: Hardware Settings

    See page 93 for quick reference information on how to use the RS485/422 interface of the PTB220 series digital barometers. Normally, the dip switch S1 settings are all OFF as in...
  • Page 40 SW3 in position ON as . See Appendix D for quick reference information on how IGURE to set and use the pulse output mode of the PTB220 series digital barometers. Pulse mode ON...
  • Page 41 4_____________________________________________________________ HAPTER COMMISSIONING Summarized settings of the dip switch S1. ABLE not used external power control OFF (TTL: 0 VDC) external power control ON (TTL: 5 VDC pulse output mode OFF pulse output mode ON analog output module**; see page 87 memory write DISABLE memory write ENABLE not used...

  • Page 43: Chapter 5 Installation

    Mounting In automatic weather station applications and in other harsh operating environments, the PTB220 series digital barometers have to be installed inside a weather resistant or otherwise protective enclosure. The pressure fitting must also be protected from rain as water may get into the pressure connector and cause errors in the pressure measurement.

  • Page 44: Electrical Connections

    _______________________________________________________________________ UIDE ø6.5 Dimensions and mounting positions of PTB220 IGURE barometers Electrical connections In barometers with RS232C/TTL level serial/pulse interface the pin assignment is as follows: 9-pin female subD-connector IGURE Pin assignment for RS 232C/TTL serial/pulse output ABLE SIGNAL TX with diode TX/TXD/TXD inverted RX/RXD/RXD inverted external power on/off control...
  • Page 45 / current output ground supply voltage (10...30 VDC) It is possible to connect multiple PTB220 series barometers to one RS 232C interface by using the terminal ´TX with diode´ of the barometer (see ).

  • Page 46: Grounding

    _______________________________________________________________________ UIDE The two-wire half duplex RS 485/422 serial interface is the recommended way of connecting the PTB220 series barometers with other intelligent transmitters (see ). See page 93 for quick reference information on how to use IGURE the RS485/422 interface of the PTB220 series barometers.

  • Page 47: Pressure Connections

    5_______________________________________________________________ HAPTER INSTALLATION The PTB220 series digital barometers comply with the CE norms for electromagnetic compatibility provided that braided cable and proper grounding techniques are used. The use of an unbraided cable may result digital communication problems erraneous measurements. Pressure connections The barometer is equipped with a barbed pressure fitting which is ideal for 1/8"...

  • Page 49: Chapter 6 Operating

    6________________________________________________________________ HAPTER OPERATING OPERATING CHAPTER 6 Only a few commands are needed to operate a PTB220 barometer in the RUN, STOP and POLL modes. In the SEND mode and in the PULSE mode no commands are needed. In the RUN or STOP modes the commands R, S and SEND can be used.

  • Page 50: R Starting The Continuous Output

    _______________________________________________________________________ UIDE Commands used in RUN and STOP modes ABLE Function Command starting output stopping output single message output SEND verification message self-diagnostics DNOS pressure minimum/maximum tracking TRACK pressure limit listing PLIM resetting the barometer RESET R Starting the continuous output R <cr>...

  • Page 51: Send Outputting A Single Message Only

    V <cr> The V command is used to output the verification message of the barometer. The verification message outputs the nominal pressure range of the barometer. >v <cr> VAISALA DIGITAL BAROMETER PTB 220 500.00 to 1100.00 hPa > DNOS Self-diagnostics DNOS <cr>...

  • Page 52: Track Setting The Pressure Tracking Mode On/Off

    At power-up the tracking mode is always deactivated. The serial interface and the local display of the PTB220 series barometers have separate tracking modes. The serial interface TRACK command will not cause pressure tracking limits to be displayed by the local display of the barometer.

  • Page 53: Reset Resetting The Barometer

    6________________________________________________________________ HAPTER OPERATING Example: >track off <cr> Min/max track.: >plim <cr> Stab. level 0.50 hPa Hi alarm 1100.00 hPa Lo alarm 500.00 hPa >track on <cr> Min/max track.: >plim <cr> Stab. level 0.50 hPa 1020.31 hPa 987.65 hPa Hi alarm 1100.00 hPa Lo alarm 500.00 hPa...

  • Page 54: Poll Mode

    OPEN a closing a barometer CLOSE The POLL mode is used when several PTB220 series barometers are connected to one RS232C serial interface for fine adjustment and calibration in one batch. It is also used when several intelligent transmitters are connected to a half duplex RS 485/422 serial interface.

  • Page 55: Open Setting A Barometer From Poll Mode To Stop Mode

    (except for the ? command, see Diagnostic commands on page 66). The CLOSE command is a global command and requires no address. The PTB220 series digital barometers must always be closed after the POLL mode selection. The RESET command and powering-up will close the PTB220 series barometers automatically.

  • Page 56: Send Mode

    _______________________________________________________________________ UIDE Example of closing a barometer: >close <cr> line closed SEND mode In the SEND mode the barometer will automatically output one message at power-up or when triggering the barometer on using pin 4 of the barometer. The trigger signal must be a TTL level signal. TTL HIGH (5 VDC) turns the barometer ON and TTL LOW (0 VDC) turns the barometer OFF.

  • Page 57: Pulse Mode

    PTB220 series barometers. Operating the local display and keyboard The display and keyboard of the PTB220 series barometers is a configuration option. The LCD display has on/off selectable backlight for better readability at any light conditions. The two rows of the display can be defined to indicate different kind of information (see Software settings, DFORM command on page 22).
  • Page 58 Use the arrow keys ↑ and ↓ to scroll the alternatives and the ENT key to acknowledge a selection. Use CL key to revert to the original display. shows all the available functions and selections of the IGURE local display of PTB220 series barometers. 52 ___________________________________________________________________ M210194...
  • Page 59 6________________________________________________________________ HAPTER OPERATING Available functions and selections of the local display IGURE See Chapter Software settings for more information on: - averaging time setting (see AVRG command) - pressure stability indicator setting (see PSTAB command) - pressure difference limit setting (see PDMAX command) - pressure alarm setting (see PLARM command) _________________________________________________________________________ 53 AISALA...
  • Page 60 DFORM command (see Chapter Software settings) for the second row of the display will then be replaced by the display pressure tracking readings. The backlight can be turned on/off only with the keyboard of the PTB220 series barometers. 54 ___________________________________________________________________ M210194...

  • Page 61: Adjustment And Calibration

    CHAPTER 7 CALIBRATION Introduction The PTB220 series digital barometers can be fine adjusted and calibrated against pressure standards that have high accuracy and stability as well as known traceability to international standards. For Class A barometers, standards with uncertainty of ±70 ppm (±2 standard deviation value) or better should be used.
  • Page 62 In calibration laboratory conditions, the pressure readjustment of a PTB220 series digital barometer is made by first deactivating the linear and multipoint corrections using both the LC OFF and MPC OFF commands. All fine adjustments are then cancelled and the barometer reverts to use the factory set pressure and temperature adjustment coefficients.

  • Page 63: Corr Listing Linear And Multipoint Corrections

    7__________________________________________________ HAPTER ADJUSTMENT AND CALIBRATION Adjustment and calibration commands (*only with the ABLE optional analog output) Function Command listing corrections CORR linear corrections on/off LC ON/OFF multipoint corrections on/off MPC ON/OFF entering linear corrections entering multipoint corrections MPCI calibration date CALD entering linear corrections * DLCI *...
  • Page 64 _______________________________________________________________________ UIDE In case of one transducer, the listing looks as follows: >corr <cr> Linear adjustments Multipoint adjustments Reading Correction 499.720 -0.070 599.200 -0.080 698.710 -0.010 801.120 -0.010 900.610 -0.030 947.420 -0.020 1000.100 -0.040 1099.580 -0.040 Calibration date 1997-01-01 > In case of two transducers, the listing looks as follows: >corr <cr>...

  • Page 65: Lc Linear Corrections

    7__________________________________________________ HAPTER ADJUSTMENT AND CALIBRATION LC Linear corrections LC x <cr> where: x = ON or OFF The LC command is used to activate or deactivate the linear offset or offset/gain corrections. The linear corrections are protected with switch SW4 (see IGURE The switch SW4 is normally in write DISABLE position (OFF) and the user must change it to write ENABLE position (ON) to be able to...

  • Page 66: Mpc Multipoint Corrections

    _______________________________________________________________________ UIDE MPC Multipoint corrections MPC x <cr> where: x = ON or OFF The MPC command is used to activate or deactivate the multipoint corrections. The multipoint corrections are protected with switch SW4 (see IGURE ). The switch SW4 is normally in write DISABLE position (OFF) and the user must change it to write ENABLE position (ON) to be able to turn the multipoint corrections on or off.

  • Page 67: Offset And Gain Adjustment

    7__________________________________________________ HAPTER ADJUSTMENT AND CALIBRATION Offset and gain adjustment LCI Entering linear corrections LCI n <cr> where: n = number of the pressure transducer (1, 2 or 3) The LCI command is used to enter new linear offset and offset/gain corrections to the barometer.

  • Page 68: Multipoint Adjustment

    _______________________________________________________________________ UIDE NOTE Always remember to return the switch SW4 to write DISABLE position (OFF). Multipoint adjustment MPCI Entering multipoint corrections MPCI n <cr> where: n = number of the pressure transducer (1, 2 or 3) The MPCI command is used to enter new multipoint corrections to the barometer.

  • Page 69: Calibration

    7__________________________________________________ HAPTER ADJUSTMENT AND CALIBRATION correction ? -0.08 <cr> reading ? 698.71 <cr> correction ? -0.01 <cr> reading ? 801.12 <cr> correction ? -0.01 <cr> reading ? 900.61 <cr> correction ? -0.03 <cr> reading ? 947.42 <cr> correction ? -0.02 <cr> reading ? 1000.10 <cr>...

  • Page 70: Cald Storing The New Date Of Calibration

    _______________________________________________________________________ UIDE CALD Storing the new date of calibration CALD yyyy-mm-dd <cr> This command is used to store the new valid date of calibration in the memory of the barometer. Example: >cald <cr> Calibration date ????-??-?? >cald 1997-01-01 <cr> Calibration date 1997-01-01 >...

  • Page 71: Self-Testing And Problem Handling

    8____________________________________________ HAPTER SELF TESTING AND PROBLEM HANDLING SELF-TESTING AND CHAPTER 8 PROBLEM HANDLING Returning the serial communication parameters As the barometer software and hardware settings may not always be known, it is important that the barometer can be returned to factory settings.

  • Page 72: Diagnostic Commands

    Stop bits Duplex full duplex Diagnostic commands The PTB220 series digital barometers respond to a set of diagnostic commands, which are useful for analyzing the basic settings and general operation of the barometers. The diagnostic commands are listed in Diagnostic commands...

  • Page 73: Vers Software Version

    NOTE This command must be used only for one barometer at a time. Any PTB220 series barometer will always respond to ?-command whatever its settings are, provided that the serial interface settings are correct. Should the serial interface settings not be known see Chapter Returning the barometer to the factory settings on page 65.

  • Page 74: Test N Testing Transducer Operation

    _______________________________________________________________________ UIDE >errs <cr> E00 Nothing special to report > Complete list of error codes: E00 Nothing special to report E10 CPU EEPROM ackn. error E20 CPU EEPROM csum error E11 P1 EEPROM ackn. error E14 DAC EEPROM ackn. error E21 P1 EEPROM csum error E24 DAC EEPROM csum error...

  • Page 75: C N Listing Transducer Coefficients

    8____________________________________________ HAPTER SELF TESTING AND PROBLEM HANDLING C n Listing transducer coefficients C n <cr> where n = number of the pressure transducer (1, 2 or 3) The C n command is used to list all internal coefficients of a transducer.
  • Page 76 In case of an error, there will be no pulse output from the barometer despite an external trigger pulse. This error handling technique ensures that a host system cannot receive erroneous pressure readings from a PTB220 series barometer. 70 ___________________________________________________________________ M210194...

  • Page 77: Chapter 9 Technical Specifications

    9____________________________________________________ HAPTER TECHNICAL SPECIFICATIONS TECHNICAL CHAPTER 9 SPECIFICATIONS Barometric pressure Operating range 50...1100 hPa, 500...1100 hPa Pressure ranges Temperature range operating -40 ... +60 ºC with local display 0 ... +60 ºC storage -60 ... +60 ºC -20 ... +60 °C with local display Humidity range non-condensing...

  • Page 78: General

    _______________________________________________________________________ UIDE *** Defined as the root sum of the squares (RSS) of end-point non- linearity, hysteresis error, repeatability error and calibration uncertainty at room temperature. **** Defined as ±2 standard deviation limits of temperature dependence over the operating temperature range. General (* factory setting) Supply voltage...

  • Page 79: Mechanics

    Dimensions of the PTB220 barometers IGURE Electromagnetic compatibility The PTB220 series barometers are designed to comply with the CE norms for electromagnetic compatibility. The condition for this compliance is the use of braided cables and proper grounding techniques. The PTB220 barometers have successfully passed the following emission and immunity test.

  • Page 80: Options

    _______________________________________________________________________ UIDE EN 61326-1:1997 +Am 1:1998, Electrical equipment for measurement, control and laboratory use - EMC requirements; Generic environment. Test methods: Emission Radiated emissions CISPR16 class B (CISPR22 Class 22) Immunity Electrostatic discharge (ESD) EN/IEC 61000-4-2 EM field EN/IEC 61000-4-3 EFT Burst EN/IEC 61000-4-4 Surge...
  • Page 81 9____________________________________________________ HAPTER TECHNICAL SPECIFICATIONS 25328 Quick coupling 25329 Tube fitting The PTB220CASE kit includes an oak case, a sealed lead acid battery and recharging electronics (order code: PTB220CASE). _________________________________________________________________________ 75 AISALA...

  • Page 83: Appendix A Hardware Configurations

    A __________________________________________________ PPENDIX HARDWARE CONFIGURATIONS APPENDIX A HARDWARE CONFIGURATIONS Configuration with one pressure transducer IGURE Configuration with two pressure transducers IGURE _________________________________________________________________________ 77 AISALA...
  • Page 84 _______________________________________________________________________ UIDE Configuration with three pressure transducers IGURE Configuration with two pressure transducers and two IGURE pressure ports 78 ___________________________________________________________________ M210194...

  • Page 85: Appendix B Pin Assignments

    PPENDIX PIN ASSIGNMENTS APPENDIX B PIN ASSIGNMENTS The pin assignment of the 9-pin female subD-connector of the PTB220 series digital barometers seen from the front: In barometers with RS232C/TTL level serial/pulse output interface, the pin assignment is as follows: SIGNAL...
  • Page 86 _______________________________________________________________________ UIDE In barometers with RS232/analog output, the pin assignment is as follows. SIGNAL TX with diode TX/TXD/TXD inverted RX/RXD/RXD inverted external power on/off control ground for the RS 232C voltage output (0...5 VDC) / current output (0...20 mA) ground for supply voltage voltage output ground / current input ground supply voltage (10...30 VDC) 80 ___________________________________________________________________ M210194...

  • Page 87: Appendix C Rs232C/Ttl Level Serial Interface

    C __________________________________________ RS232C/TTL PPENDIX LEVEL SERIAL INTERFACE APPENDIX C RS232C/TTL LEVEL SERIAL INTERFACE The Appendix C shows connection of handshaking lines and the wave forms, voltage levels and phases of the RS232C/TTL level serial interface signals. Handshaking lines (DCD, CTR, DSR, RTS and CTS) may have to be connected at the host system end as illustrated below: 9-pin D connector 25-pin D connecto...
  • Page 88 _______________________________________________________________________ UIDE The next picture (below) shows a typical RS232C TX output signal (upper signal) and TTL level serial TXD output signal (lower signal) at baud rate 9600. The vertical scale is 5V/div for upper signal and 2V/div for lower signal. The ground level is shown with a small arrow at the right.

  • Page 89: Appendix D Pulse Output Mode

    The trigger pulse must be a TTL level signal. The pulse output of the PTB220 series barometers is triggered at the falling edge of the trigger pulse. The pulses are then output within 1 to 100 ms depending on the internal status and settings of the barometer.
  • Page 90 20.000 pulses at 1100 hPa/mbar pressure. The gate-open time could be 1 second. If FAST pulse rate (appr. 50 kHz) and LOW resolution (0.1 hPa/mbar) and no pressure offset have been defined using the PULSE command, the PTB220 series barometer will output a maximum of 11.000 pulses 84 ___________________________________________________________________ M210194...
  • Page 91 D ____________________________________________________ PULSE OUTPUT MODE PPENDIX at 1100 hPa/mbar pressure. The gate-open time could be 0.5 ... 1 second. The pulse output mode settings must be made on two levels: - software settings - hardware settings. Example of software settings for the pulse output mode: >pulse <cr>...
  • Page 92 2000 > NOTE In case of an error in a PTB220 series barometer, there will be no pulse output from the barometer despite an external trigger pulse. This error handling technique ensures that a host system can not receive erroneous pressure readings from a PTB220 series barometer.

  • Page 93: Appendix E Analog Output

    The lower end of voltage output range is not exactly 0V but ~3mV NOTE The dip switch SW3 has to be when there is the analog output module installed in the PTB220 series barometer. AMODE x <cr> where: x = 0 (voltage output mode) or 1 (current output mode) The operating mode can be changed by using the command AMODE.
  • Page 94 _______________________________________________________________________ UIDE Examples of setting the pressure limits: >ascl<cr> (0V/4mA = 800 hPa) P Low : 500 ? (5V/20mA = 1100 hPa) P High : 1100 ? 1100 > ITEST x.xx <cr> where: x = current or voltage value to be checked The operation of the analog output can be tested by forcing the output to given values, which can be measured with a current/voltage meter from the analog output.
  • Page 95 E ___________________________________________________________ A PPENDIX NALOG OUTPUT 1. Open the cover of the barometer and set the dip switch SW4 to upward position (ON). 2. Use the serial line to give the command LC OFF, which deactivate the linear correction. 3. Give the command ITEST X and measure the output current / voltage.

  • Page 96: Pin Assignment

    _______________________________________________________________________ UIDE 9. Remember to restore the dip switch SW4 (OFF). NOTE Entering new linear corrections will always cancel the previous corrections. It is advisable to write down the factory set linear corrections so that they will not be lost by mistake. When using the analog output, the corrections are performed only if NOTE the LC is activated (see LC command on page 59)

  • Page 97: Appendix Fmultiple Ptb220 Barometers On Rs232C

    PTB220 # 3 TX WITH DIODE To be able to use multiple PTB220 series barometers on one RS232C interface the user must first set an address for each barometer and then activate the POLL/CLOSE mode. Then the barometers can be connected to the same RS232C interface and they can be polled by the SEND command or by using the OPEN/POLL commands.
  • Page 99 120R 33nF At the ends of the serial bus there must be a PTB220 series barometer, a dynamic line adapter (120 Ω resistor in series with a 33 nF capacitor) or a line master. If a branch line is made with a junction box, the branch should be shorter than 3 meters.
  • Page 100 _______________________________________________________________________ UIDE (select address of the barometer) >addr 7 <cr> Address 7 <cr> (select the POLL mode) >smode poll <cr> Serial mode : POLL (resetting will activate the new settings) >reset <cr> (no title will appear after reset in POLL mode) (text invisible) send 7 <cr>...
  • Page 101 G ______________________O RS485/422 INTERFACE OF 220 BAROMETERS PPENDIX PTIONAL _________________________________________________________________________ 95 AISALA...

  • Page 103: Appendix H Serial Interface Commands

    H _______________________________________________ INTERFACE PPENDIX SERIAL COMMANDS APPENDIX H SERIAL INTERFACE COMMANDS Commissioning commands Function Command sending mode SMODE measurement mode MMODE pulse mode settings PULSE serial bus settings SERI echo on / off ECHO output format FORM pressure resolution FORM pressure trend FORM pressure tendency...

  • Page 104: Maintenance Commands

    _______________________________________________________________________ UIDE Maintenance commands Function Command listing linear and multipoint corrections CORR linear corrections on/off LC ON/OFF entering linear corrections multipoint corrections on/off MPC ON/OFF entering multipoint corrections MPCI calibration date CALD entering linear corrections of analog output DLCI* * only with the optional analog output Diagnostic commands Function Command...

  • Page 105: Appendix Ichecksum

    I ________________________________________________________________ CHE PPENDIX CKSUM APPENDIX I CHECKSUM With a form the user can check that the data sent by the CHECKSUM barometer has not changed in transfer line. The format can CHECKSUM be output with 4 (CS4) or 2 (CS2) hex numbers. The PTB220 calculates the checksum value of all the numbers set before the parameter CS4/CS2.

  • Page 107: Appendix Jpressure Tendency

    Steady or increasing, then decreasing; or decreasing then decreasing more rapidly; atmospheric pressure now lower than three hours ago In addition to this the PTB220 series barometers output code * when the pressure tendency has not yet been calculated i.e. less than three hours have elapsed since power-up of the barometer.

  • Page 108: Appendix K Error Messages

    _______________________________________________________________________ UIDE APPENDIX K ERROR MESSAGES The error/alarm messages of the PTB220 series digital barometers are: ERR / PASS (see DNOS command) HI ALARM (see PLARM command) LO ALARM (see PLARM command). The HI ALARM or LO ALARM are output by the barometer immediately and only once when the defined limit is exceeded, yet normal outputting is otherwise continued.

  • Page 109: Appendix Lspecial Emulation Mode

    P Mode The P mode just sets the PTB220 series barometer to output the message type 1 of serial mode 2 of the barometer. Please note the capital letter P in the command. The dip switch settings should be as...

  • Page 110: Automode

    1014.4 hPa and three-hour trend is +0.8 hPa. Automode The Automode just sets the PTB220 series barometer to automatically output the standard output string of the barometer at 15 seconds interval (see also previous chapter). The dip switch settings should be...

  • Page 111: Setra 470

    In this mode the PTB220 barometer ignores carriage returns, line feeds and blank spaces. Just type the commands as given here. At power-up the PTB220 barometers will respond: VAISALA DIGITAL BAROMETER PTB 220 BUSY and then after a few seconds:...
  • Page 112 D-NOS BUSY PASS D-NOS BUSY In order to exit the D-NOS mode, give the command C and the output VAISALA DIGITAL BAROMETER PTB 220 BUSY and then after a few seconds: VAISALA DIGITAL BAROMETER PTB 220 11.812 to 35.436 in Hg A...

  • Page 113: Appendix M Pressure Conversion Chart

    M ________________________________________________ P PPENDIX RESSURE CONVERSION CHART APPENDIX M PRESSURE CONVERSION CHART Pressure conversion chart Multiplication factors Note: conversions for mmHg and inHg are defined at 0°C temperature and for mmH2O and inH2O at 4°C temperature. psia = FROM psi absolute mmHg inHg mmH2O...

Table of Contents

Save PDF