Michell Instruments Optidew User Manual
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Michell Instruments Optidew User Manual

Chilled mirror hygrometer
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Optidew
Chilled Mirror Hygrometer
User's Manual
97551 Issue 1
February 2018

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  • Page 1 Optidew Chilled Mirror Hygrometer User's Manual 97551 Issue 1 February 2018...
  • Page 2 Please fill out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Analyzer Code Serial Number Invoice Date Location of Instrument Tag No Analyzer Code Serial Number Invoice Date...
  • Page 3 © 2018 Michell Instruments This document is the property of Michell Instruments Ltd. and may not be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System without the express written authorization of Michell Instruments Ltd.

  • Page 4: Table Of Contents

    Pressure Safety ......................viii Hazardous Materials (WEEE, RoHS2 & REACH) ...............ix Calibration (Factory Validation) ..................ix Repair and Maintenance ....................ix Abbreviations ........................x INTRODUCTION ....................1 Optidew Series ....................1 Optidew Sensor ....................2 INSTALLATION ....................3 Mounting ......................3 Instrument Connections ..................4 2.2.1 Optidew 501 ....................
  • Page 5 Optidew User’s Manual OPERATION ....................29 Operating Cycle ....................29 Operating Guide ....................30 4.2.1 Description ....................30 4.2.2 Operating Practice ..................30 Good Measurement Practice ................33 4.3.1 Sampling Hints.................... 33 4.3.2 First Time Operation ..................36 Operational Functions ..................36 4.4.1...
  • Page 6 Optidew User’s Manual Figures Figure 1 Optidew 501 (wall mount) and Optidew 401 (bench top) .......1 Figure 2 Optidew 501 wall mounting points ...............3 Figure 3 Optidew 501 display front panel ..............4 Figure 4 Optidew 501 non-display front panel ............5 Figure 5 Optidew 501 bottom panel ................5...
  • Page 7 Optidew User’s Manual Appendices Appendix A Technical Specifications ................44 Appendix B Modbus Register Map ................47 Appendix C Dimensional Drawings................57 Appendix D Quality, Recycling, Compliance & Warranty Information ........ 65 Appendix E Return Document & Decontamination Declaration ........67...

  • Page 8: Safety

    Optidew User’s Manual Safety The instrument is designed to be completely safe when installed and operated correctly in accordance with the information provided in this manual. This manual contains all the required information to install, operate and maintain this product.

  • Page 9: Hazardous Materials (Weee, Rohs2 & Reach)

    Michell Instruments can provide a fully traceable factory calibration service for the instrument and it is recommended that this is considered at intervals of every year of the analyzer's life. Please contact your local Michell Instruments' office or representative for further details (www.michell.com).

  • Page 10: Abbreviations

    Optidew User’s Manual Abbreviations The following abbreviations are used in this manual: ampere alternating current pressure unit (atmosphere) bara pressure unit (=100 kP or 0.987 atm) (absolute) barg pressure unit (=100 kP or 0.987 atm) gauge °C degrees Celsius °F...

  • Page 11: Introduction

    The Optidew 401 is designed to be easy to handle and transport, and is ideal for laboratory or service use. It has a 5.7” touch screen LCD fitted as standard.

  • Page 12: Optidew Sensor

    INTRODUCTION Optidew Sensor The new Optidew sensor is available with either a single or dual stage thermoelectric cooler and with a choice of sensor head materials making it suitable for use in air/inert gases or in corrosive environments. The following tables show the capabilities of each...

  • Page 13: Installation

    (9.4) (10.2) Optidew 501 wall mounting points Figure 2 Optidew 401 The Optidew 401 is designed to be placed on a bench or table to operate. Alternatively it can be used directly from within the optional Transport Case. Michell Instruments...
  • Page 14 Optidew User’s Manual INSTALLATION Instrument Connections 2.2.1 Optidew 501 Front Panel (Display version) Optidew 501 display front panel Figure 3 Number Description Display Shows measured and calculated parameters, controls all instrument settings and functionality. 97551 Issue 1, February 2018...

  • Page 15: Figure 4 Optidew 501 Non-Display Front Panel

    Optidew User’s Manual INSTALLATION Front Panel (Non-display version) Figure 4 Optidew 501 non-display front panel Number Description DCC Control/ Status indicator Optidew 501 bottom panel Figure 5 Bottom Panel Number Description Power Connector Sensor Cable connector Temperature probe cable connector...
  • Page 16 Optidew User’s Manual INSTALLATION 2.2.2 Optidew 401 Top Panel Optidew 401 top panel Figure 6 Number Description Display Optidew 401 left side panel Figure 7 Left Side Panel Number Description Power Connector Power Switch 97551 Issue 1, February 2018...
  • Page 17 Optidew User’s Manual INSTALLATION Figure 8 Optidew 401 right side panel Right Side Panel Number Description SD Card slot Optidew 401 rear panel Figure 9 Rear Panel Number Description Sensor Cable connector Temperature probe cable connector Pressure transmitter cable connector...

  • Page 18: Electrical Connections

    DCC cycle. Replacement power cables are available - contact your Michell representative. Optidew 401 The Optidew 401 is supplied with a 2m IEC cable. The IEC socket on the side of the instrument features an integrated ON/OFF switch. Fuse This product is provided with an externally mounted fuse located next to the power connector.

  • Page 19: Analog And Digital Communications

    Analog and Digital Communications Note: When using screened cable, the screen should only be connected to a ground point at either the Optidew installation side, or at the receiving equipment. Failure to observe this precaution can result in ground loops and equipment malfunction.

  • Page 20: 2.3.2.2 Current Outputs

    Optidew User’s Manual INSTALLATION 2.3.2.2 Current Outputs Figure 11 Analog output connector The rightmost four of the pins on this connector are used for mA outputs. See section 3.2 for information on configuring the analog outputs Pin Label Description Channel 1 Current Output...
  • Page 21 Optidew User’s Manual INSTALLATION Pin Label (from left to right as Description shown) Relay 1 Normally Closed Relay 1 Common Relay 1 Normally Open Relay 2 Normally Closed Relay 2 Common Relay 2 Normally Open Michell Instruments...

  • Page 22: Sensor Installation

    Optidew User’s Manual INSTALLATION Sensor Installation The dew-point sensor contains the optical system and the chilled mirror. It is fitted with a 12-pin M12 connector to allow easy and secure connection to the instrument using the supplied sensor cable. The available options for sensor installation are: •...

  • Page 23: Integral Sensor Mounting

    Optidew control unit via the 4-pin M12 connector. Michell can supply a pressure transmitter with the Optidew, which is installed via a 1/8” NPT male thread. The pressure source should be installed with consideration to the calculated values which will be used.

  • Page 24: User Interface

    Display model, or a button with multicolor LED indicator on the transmitter version. All functionality available through the local user interface is present in the when running the Michell Application Software. The Optidew offers three interfaces to connect to a PC or network: •...

  • Page 25: Main Screen

    Optidew User’s Manual OPERATION 3.1.1 Main Screen Main screen layout Figure 14 Name Description Display measured and calculated parameters. See Customizable Readouts section 3.1.2 for additional information Displays both thermo-electric cooler (TEC) drive and optical signal condition. Also indicates Sensor Status Display whether TEC is 1 or 2 stage.
  • Page 26 Optidew User’s Manual OPERATION 3.1.2 Customizable Readouts The three readouts on the Main Screen can be configured by the User to show any of the following parameters: • Dew Point • Temperature • Pressure • % Relative Humidity • •...

  • Page 27: Menu Structure

    Optidew User’s Manual OPERATION 3.1.3 Menu Structure Setup Logging Output Alarm Type Interval Output Select Type Display Clock Inputs Comms Setpoint Filename Output Type Parameter Resolution Date Source Pressure Unit Modbus Address Mode Status Stability Time Compensation Setpoint Parameter Setpoint A...

  • Page 28: Operational Status Display

    Optidew User’s Manual OPERATION 3.1.4 Operational Status Display Shows total change in measured dew point over the time base of ΔDP the trend graph Mode Shows current operation mode: Next Mode Measure, Standby, DCC, Max Cool, Data Hold Status of Process Alarm.

  • Page 29: Sensor Status Display

    Connected sensor Do not connect a 1-Stage sensor to a control unit configured for 2-Stage or vice- versa. When shown, the Optidew is currently logging data to SD. Logging See section 4.4.6 for further information. Displayed when pressure Pressure compensation is active.

  • Page 30: Setup Menus

    Optidew User’s Manual OPERATION Setup Menus DCC menu Figure 15 DCC heating temperature can either be relative to last measured dew point or absolute temperature. Actual temperature or Δ is Type defined by ‘Setpoint’. Available input: Relative, Absolute Mirror heating temperature during DCC, either absolute or Setpoint relative to last measured dew point.
  • Page 31 Optidew User’s Manual OPERATION Logging Figure 16 Logging screen Changes the interval at which data is recorded Interval Input format: mm:ss – Limits: 00:05 to 10:00 Indicates status of inserted SD card: No SD Card inserted Ready to log Initialising card...
  • Page 32 Optidew User’s Manual OPERATION Outputs Outputs screen Figure 17 Output selector Selects the output to be adjusted arrows Chooses the mA output range Output Type Available input: 0-20mA, 4-20mA Assigns the chosen calculated or measured parameter to this output channel...
  • Page 33 Optidew User’s Manual OPERATION Alarm Alarm screen Figure 18 Sets the trip criteria for the process alarm Type Available input: Over, Under, In. Band, Out. Band, Off Sets the parameter associated with the process alarm Parameter Available input: DP, Temperature, Pressure, %RH, wvp, g/m...
  • Page 34 Optidew User’s Manual OPERATION Display Display screen Figure 19 Changes the number of decimal places for all displayed Resolution parameters Available input: 1 DP, 2 DP Measurement unit for temperature values Temperature Unit Available input: °C, °F Measurement unit for pressure values...

  • Page 35: Figure 20 Clock Screen

    Optidew User’s Manual OPERATION Clock Clock screen Figure 20 Date Current date Time Current time Michell Instruments...
  • Page 36 Optidew User’s Manual OPERATION Inputs Inputs screen Figure 21 Changes between pressure input from external 4-20mA Source (Pressure transmitter or a fixed value Input) Available input: Fixed, External Measurement unit for pressure inputs Pressure Unit Available input: kPa, psig, psia, barg, bara Setpoint (If ‘Manual’...
  • Page 37 Optidew User’s Manual OPERATION Comms Screen Comms screen Figure 22 Modbus Address Sets the Modbus slave address for this Optidew Setup Access the TCP/IP Network Settings page Network Settings Network settings screen Figure 23 IP Address The IP address of the instrument...

  • Page 38: Transmitter Version

    Optidew User’s Manual OPERATION Transmitter Version The Optidew can also be ordered as a transmitter version without a touch-screen display. This unit comes with a single button and multi-color LED indicator which displays the current instrument status. The indicator changes color and pulse depending on the instrument status...

  • Page 39: Operating Cycle

    Optidew User’s Manual OPERATION OPERATION Operating Cycle Figure 24 Typical operating cycle At initial switch-on, the instrument enters a DCC cycle for 2 minutes. During this time the mirror is heated above the prevailing dew point to ensure that all condensate is driven off the surface of the mirror.

  • Page 40: Operating Guide

    4.2.1 Description Once the Optidew has been powered on and has carried out its’ initial DCC, it will attempt to find the dew point. In order to measure the dew point a Chilled Mirror hygrometer must control a thin film of condensed water or ice on the mirror.

  • Page 41: Figure 25 Room Measurement Example

    Optidew User’s Manual OPERATION The basic considerations for each measurement type are as follows: In-Situ Dew-Point Sensor position – will the sensor see an area of the environment that is representative of what you want to measure? For example; you are looking to measure the Relative Humidity of a room which is controlled by an HVAC vent at either end (see fi...
  • Page 42 Ensure that the sensor is positioned in an environment of known pressure. You can then either enter this pressure into the Optidew via the ‘Inputs’ screen (see section 3.2), or connect a pressure sensor directly to the point of measurement (see section 2.6).

  • Page 43: Good Measurement Practice

    Optidew User’s Manual OPERATION Good Measurement Practice 4.3.1 Sampling Hints Measurement of moisture content is a complex subject, but does not need to be difficult. This section aims to explain the common mistakes made in measurement situations, the causes of the problem, and how to avoid them. Mistakes and bad practices can cause the measurement to vary from the expectation;...
  • Page 44 Optidew User’s Manual OPERATION almost indefinitely. However, as the temperature rises, so does the likelihood of desorption occurring. In practical terms, as the temperature of the environment fluctuates, water molecules are adsorbed and desorbed from the internal surfaces of the sample tubing, causing small fluctuations in the measured dew point.
  • Page 45 Optidew User’s Manual OPERATION Maintaining the temperature of the sample system tubing above the dew point of the sample is vital to prevent condensation. Any condensation invalidates the sampling process as it changes the water vapour content of the gas being measured. Condensed liquid can alter the humidity elsewhere by dripping or running to other locations where it may re-evaporate.

  • Page 46: First Time Operation

    Optidew User’s Manual OPERATION 4.3.2 First Time Operation Before using the instrument, please read through the Installation, Operation and Maintenance sections of this manual. This instruction assumes that all recommendations within these sections have been followed, and that the control unit and sensors are physically installed and all electrical connections complete.

  • Page 47: Maxcool Function

    There are two modes of FAST operation, enabling and disabling FAST acts on both modes: Following DCC: the Optidew makes an initial dew point measurement. If the initial measurement is between -3°C and -30°C then the mirror is driven down to below -35°C to ensure the formation of ice on the mirror surface.

  • Page 48: Parameter Conversions & Pressure Compensation

    These additional readings can either come from a sensor connected to the Optidew, or from a fixed (manual) input. See section 3.2 for details on external inputs.

  • Page 49: Warnings And Faults

    Faults – A problem which requires immediate attention. Whenever a fault is triggered, the Optidew will switch to ‘Standby’ and remain in this mode until the operator intervenes. When a Fault is present, the System Alarm symbol will appear over the sensor status display on the main screen.

  • Page 50: Maintenance

    Optidew User’s Manual MAINTENANCE System alarm Figure 30 Possible Fault Codes Name Description Mirror Overheat Mirror Temperature above 130°C Optics Fault (Search Fail) Unable to establish clean mirror condition Optics Fault (< Min Limit) Signal below allowable limit Optics Fault (> Max Limit)

  • Page 51: Mirror Cleaning

    The Optidew will notify the user on the state of mirror contamination. The instrument will initially give a warning in the sensor status display (or as a Magenta/flashing Magenta indication on the transmitter version) when contamination is detected, but will continue to operate.

  • Page 52: Exchanging Sensors

    Optidew User’s Manual APPENDIX A Sensor cleaning Figure 32 Exchanging Sensors It is recommended to keep the dew-point sensor with the control unit that it was originally ordered with. However if it is necessary to replace the sensor or exchange it for a spare, there are two steps which need to be taken.

  • Page 53: Appendix A Technical Specifications

    Optidew User’s Manual APPENDIX A Appendix A Technical Specifi cations Michell Instruments...
  • Page 54 Optidew User’s Manual APPENDIX A Appendix A Technical Specifi cations Performance Dew Point Measurement ±0.15°C Accuracy Reproducibility ±0.05°C Sensitivity ±0.01°C Response Stable measurement at +10°C dp within 1 minute Dew-Point Sensor Sensor Single Stage Dual Stage Harsh Environment Dew Point Range...
  • Page 55 Optidew User’s Manual APPENDIX B Control Unit Resolution 1 or 2 decimal places selectable °Cdp or °Fdp Relative humidity - % Absolute humidity - g/m , ppm Mixing Ratio - g/kg Measurement Units Wet Bulb Temperature (Twb) - °C, °F Water Vapour Pressure (wvp) - Pa Ambient Temperature - °C, °F...

  • Page 56: Appendix B Modbus Register Map

    Optidew User’s Manual APPENDIX B Appendix B Modbus Register Map 97551 Issue 1, February 2018...
  • Page 57 Appendix B Modbus Register Map All the data values relating to the Optidew are stored in 16-bit wide holding registers. Registers can contain either measured or calculated values (dew-point, temperature, relative humidity etc.), or configuration data (analog output or alarm settings).
  • Page 58 Optidew User’s Manual APPENDIX B Further Reading http://www.simplymodbus.ca/FAQ.htm is an excellent resource covering the basics of the Modbus protocol. Full descriptions of the function codes (FC03/FC06/FC16) can be found in the sidebar. https://www.scadacore.com/tools/programming-calculators/ online-hex-converter/ is an excellent resource for determining register types/byte order issues in raw received Modbus data.
  • Page 59 Optidew User’s Manual APPENDIX B Register Address Access Data Type Description Comment Instrument Information 0000 uint16 Instrument Modbus Address 0002 uint32 Instrument Serial MS 0003 Instrument Serial LS 0004 uint16 Instrument Firmware Version 0005 uint16 Register Map Version Measured and Calculated Values...
  • Page 60 Optidew User’s Manual APPENDIX B 001F uint16 Pressure Unit Set using register 101 0=psig 1=psia 2=barg 3=bara 4=kPa Instrument Status 0021 uint16 Operating Mode 5=MaxCool 6=DCC 7=Hold 8=Measure 9=Standby 10=FAST 13=System Failure 0022 uint16 Mode Hrs Left 0023 uint16 Mode Mins Left...
  • Page 61 Optidew User’s Manual APPENDIX B 0=No Alarm 1=System 2=Process 0029 uint16 Logging Status 0=Not Fitted 1=No Card 2=Ready 3=Logging 4=Writing 5=Mount Error 6=Write Error 7=Mounting 8=Write Protected 9=Unknown 002A boolean Data Hold Active 002B boolean Display Hold Active 0032 int16...
  • Page 62 Optidew User’s Manual APPENDIX B 006E boolean Pressure Correction Enabled 006F uint16 Pressure Correction Direction 0=To atmospheric 1=From atmospheric Pressure Sensor Configuration 0070 uint16 Pressure Sensor Source 0=External 1=Manual 0071 uint16 Pressure Sensor Unit 0=psig 1=psia 2=barg 3=bara 4=kPa 0072...
  • Page 63 Optidew User’s Manual APPENDIX B 0085 boolean FAST Enable 0086 float FAST Setpoint MS 0087 FAST Setpoint LS 0088 uint16 Peltier Stages 1=1 Stage 2=2 stage (Degrees * 1000) .. 008C uint16 Stability Band Threshold to end Data Hold 008D...
  • Page 64 Optidew User’s Manual APPENDIX B Analog Output Settings 009B uint16 Analog 1 Type 0=0-20mA 1=4-20mA 009C uint16 Analog 1 Parameter 0=Dew/Frost point 1=Temperature 2=Pressure 3=Relative Humidity 4=ppm(vol) 5=ppm(wt.) 6=Mixing Ratio 7=Absolute Humidity 8=Wet bulb 9=WVP 009D float Analog 1 Range Low MS...
  • Page 65 Optidew User’s Manual APPENDIX C 0=Off 1=Over Setpoint A 2=Under Setpoint A 3=Inside Setpoint A & B 4=Outside Setpoint A & B 00AD float Process Alarm Hysteresis MS 00AE Process Alarm Hysteresis LS 00AF float Process Alarm Setpoint A MS...

  • Page 66: Appendix C Dimensional Drawings

    Optidew User’s Manual APPENDIX C Appendix C Dimensional Drawings 97551 Issue 1, February 2018...
  • Page 67 Optidew User’s Manual APPENDIX C Appendix C Dimensional Drawings Optidew 401 Control Unit Michell Instruments...
  • Page 68 Optidew User’s Manual APPENDIX C Optidew 501 Control Unit – IP54 240.0mm 9.449" 260.0mm 10.236" 220.0mm 8.661" 97551 Issue 1, February 2018...
  • Page 69 Optidew User’s Manual APPENDIX C Optidew 501 Control Unit – IP65 240.0mm 9.449" 61.5mm 2.421" 126.0mm 4.961" 260.0mm 10.236" 220.0mm 8.661" Michell Instruments...
  • Page 70 Optidew User’s Manual APPENDIX C Single Stage Dew-Point Sensor 46.0mm 1.811" 101.8mm 4.008" 44.8mm 1.764" 30.8mm 1.213" M36 x 1.5 M30 x 1.5 97551 Issue 1, February 2018...
  • Page 71 Optidew User’s Manual APPENDIX C Dual Stage Dew-Point Sensor Michell Instruments...
  • Page 72 Optidew User’s Manual APPENDIX C Sample Block 97551 Issue 1, February 2018...
  • Page 73 Optidew User’s Manual APPENDIX C Temperature Probe Michell Instruments...
  • Page 74 Optidew User’s Manual APPENDIX D Appendix D Quality, Recycling & Warranty Information 97551 Issue 1, February 2018...

  • Page 75: Appendix D Quality, Recycling, Compliance & Warranty Information

    APPENDIX D Appendix D Quality, Recycling, Compliance & Warranty Information Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at: www.michell.com/compliance This page contains information on the following directives: •...

  • Page 76: Appendix E Return Document & Decontamination Declaration

    Optidew User’s Manual APPENDIX E Appendix E Return Document & Decontamination Declaration 97551 Issue 1, February 2018...
  • Page 77 Has the equipment been cleaned and decontaminated? NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous Work will not be carried out on any unit that does not have a completed decontamination declaration.
  • Page 80 http://www.michell.com...
  • Page 81 Application Software Contents Connecting a device ......................2 Main Options ........................4 Data Acquisition ......................5 Logging Setup ......................... 6 Strip Chart Controls ......................8 Configuration Screens....................11 Modbus Slave ....................... 12 Humidity Profiling ......................14   Issue 1.0 January 2018...

  • Page 82: Connecting A Device

    Connecting a device Physical connection In order for the application to communicate with an instrument, it must be connected to the computer. This connection can be made via a serial, USB or Ethernet connection. Select the Instrument Choose (click to highlight) your instrument from the list on the left. NOTE: Modbus TCP controls will only enable if the instrument supports it.
  • Page 83 Finding the correct Communications Port for your device Modbus TCP Connections To connect to an instrument fitted with Modbus TCP, select the Modbus TCP/IP radio button, enter the IP address of the device and the network port number. NOTE: The default (recommended) Modbus TCP port number as defined in the Modbus standards is 502.

  • Page 84: Main Options

    Main Options The Main Options window presents an options list for the connected device. Standard options (available for every device) include i) Data Acquisition and ii) Modbus Slave. Other setup and configuration options buttons on this window will be specific to the connected device. Data acquisition This button launches the main data acquisition window.
  • Page 85 Data Acquisition The Data Acquisition window provides display, strip-charting and logging of main device parameters. Live device parameters Live parameters are listed in the top half of the window. These include primary measurements (such as humidity and temperature), status information and any notes. Any warnings or critical conditions together with associated notes are displayed in the Status and Notes columns of the display area.

  • Page 86: Logging Setup

    NOTE: While zoomed in, the chart mode (located at the top-centre of the chart) changes to "Zoomed in" and the chart will not display new data (although new data is recorded in the background). Two controls to zoom out or reset zoom are provided in the upper left area of the chart. The [Pause] button will stop the chart from updating with new data.
  • Page 87 Setup and start a log 1. Click the [Choose log file...] button to pick a filename and save location. 2. Choose a log interval from the log interval drop-down menu. Interval options are shown below: 3. If you wish to include parameter units in the log file, check the "Include units" options. The [START] button will now enable.

  • Page 88: 5.5 Strip Chart Controls

    5.5 Strip Chart Controls X-Axis Auto-scroll When checked, the strip-chart will scroll automatically as new data is added. Auto-scale When ticked, the strip-chart X-Axis will scale automatically to show all data recorded so far. You cannot manually adjust the X-Axis span or scroll left/right while auto-scroll is ticked. Span The X-Axis span can only be adjusted when Auto-scale is unchecked.
  • Page 89 Marker When checked, a vertical marker will appear on the strip-chart. Drag the marker left and right to see the actual X-Axis (date/time) and corresponding data values at the point of the marker. Uncheck the marker to remove the marker and marker values from the strip-chart display area. Series You can hide or show individual series from the show/hide menu.
  • Page 90 Zoom Replicates functionality on the main chart to assist with choosing X/Y axis settings. Normal resets the view. Out zooms out a further level. Legend Sets legend location. Save graph data Click [Save as image] to save the current strip-chart display area as a bitmap. Click [Save as file] to save the entire strip-chart data to a text file.

  • Page 91: Configuration Screens

    Configuration Screens Configuration screens offer the ability to both read and adjust device parameters. Closing this window takes you back to the Main Options Window. On launching a setup/configuration window, parameter values are read from the Instrument and displayed on the window, providing up-to-date information. Adjusting a value Where the parameter is a numeric value, the adjustment input will be a text box where you can type a new value.

  • Page 92: Modbus Slave

    Modbus Slave The Modbus Slave Windows offers the ability to connect the software to a network as a Modbus TCP slave so that a Modbus master can connect to it over LAN or Internet. Slave setup Firstly, the Modbus slave must be connected. Enter the slave serial, TCP port and node setup details and then click the [Connect] button.
  • Page 93 NOTE: On a first slave connection, Windows Firewall (if active) may prompt to allow the TCP connection. If so - allow access. Register update options The software must keep the local copy of device registers up-to-date for the remote master and this is achieved by continuously polling the local device registers as fast as possible.

  • Page 94: Humidity Profiling

    If automatic humidity switching (profiling) is required, tick the "Include humidity profiling" option on the main connection window: NOTE: With the OptiCal that contains a built in Optidew 1, first choose the COM port for the Optidew 1 and click test. Next click “Launch” button to open the humidity profiling window, before finally clicking “Next”...
  • Page 95 Writing a profile Click the [Add] button to add rows to the profile table and enter the required humidity, temperature (Optical only) and duration into each row. Refer to the appropriate generator manual for value limits. VDS and DG-4 generators provide fixed, factory-defined dew points. For ease of selection, default dew points are listed in a drop-down list within in the humidity column of the profile table.
  • Page 96 NOTE: If a profile is running and a device is being logged simultaneously, the state of the profile is appended to the end of each device log. Issue 1.0 January 2018...

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