Michell Instruments OptiCal User Manual
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Michell Instruments OptiCal User Manual

Humidity and temperature calibrator
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Humidity and Temperature Calibrator
OPTI-CAL
integrated Humidity Calibrator
Data Acquisition
OptiCal
User's Manual
Max.
Min.
97079 Issue 9.2
March 2016
Auto On
On Auto
4 9 5
Man. Off
Off Man.
Chamber Set
Display Control
Humidity
%rh
Humidity = Yellow
De-Humidify - Green
Desiccant Charge
2 0 6
Chamber Set
Temperature
°C
Heating = Yellow
Cooling = Green

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Summary of Contents for Michell Instruments OptiCal

  • Page 1 OptiCal Humidity and Temperature Calibrator User’s Manual OPTI-CAL Auto On On Auto 4 9 5 2 0 6 integrated Humidity Calibrator Man. Off Off Man. Chamber Set Chamber Set Display Control Humidity Temperature °C Max. Min. Humidity = Yellow Heating = Yellow...
  • Page 2 Please fi ll out the form(s) below for each instrument that has been purchased. Use this information when contacting Michell Instruments for service purposes. Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date...
  • Page 3 © 2016 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

    Resetting the Mirror Condition ..............21 4.2.4 Re-calibration of the Chilled Mirror Reference ..........22 APPLICATION SOFTWARE ................23 Virtual Hygrometer ................... 23 OptiCal Remote Chamber Control ..............24 Parameter Setup ....................24 Charting and Logging ..................26 Statistics ......................28 Control Parameters ................... 28 Calibration Correction ..................
  • Page 5 OptiCal User’s Manual Figures Figure 1 OptiCal - Front View ...................2 Figure 2 OptiCal - Back Panel ...................3 Figure 3 Probe Installation ..................4 Figure 4 Location of Probes Inside the Climate Chamber ..........5 Figure 5 Filling the Water Reservoir ................6 Figure 6 Emptying the Water Reservoir ..............7...

  • Page 6: Safety

    Michell Instruments’ worldwide offi ces contact information. Calibration The OptiCal contains a high precision Optidew chilled mirror hygrometer. In order to maintain full traceability the complete OptiCal instrument should be returned annually for a service and calibration to the manufacturer, Michell Instruments, or one of their accredited service agents.

  • Page 7: Abbreviations

    OptiCal User’s Manual Abbreviations The following abbreviations are used in this manual: °C degrees Celsius °F degrees Fahrenheit alternating current direct current cubic centimeters grams per kilogram grams per cubic meter Hertz inch(es) cubic inches kilogram pounds milli Ampere maximum...

  • Page 8: Introduction

    INTRODUCTION Description The Michell OptiCal is a stable and accurate calibration solution for humidity sensors over the 10 to 90%RH and +10 to +50°C (+50 to +122°F) range. The stand-alone, transportable calibrator requires no external services other than mains power, and features an integrated chilled mirror reference instrument to enable the operator to perform calibrations that are traceable to national standards.

  • Page 9: System Components

    Humidity = Yellow Heating = Yellow De-Humidify - Green Cooling = Green Data Acquisition Control Outputs Desiccant Charge OptiCal - Front View Figure 1 Chamber door Water reservoir Optidew chilled mirror reference VFD display Desiccant cell and indicator window Display control...

  • Page 10: Figure 2 Optical - Back Panel

    Optidew chilled mirror reference optics adjustment potentiometer (refer to Section 4.2) Ventilation fans Electrical mains connector, on/off switch and power input fuse Accessories The OptiCal humidity and temperature generator is delivered with the following standard accessories: • Bottle of distilled water •...

  • Page 11: Installation

    Before using the OptiCal make sure that Sections 2.1, 2.2 and 2.4 are read thoroughly. The OptiCal enclosure is designed for bench top mounting in a laboratory type environment. It must be positioned in a clean and level location with suffi cient clearance at the rear of the enclosure for adequate ventilation.

  • Page 12: Figure 4 Location Of Probes Inside The Climate Chamber

    OptiCal User’s Manual INSTALLATION Temperature Probe Control Connector Probe Connector TOP VIEW + SUPPLY (8 - 35 VDC) OUTPUT RH OUTPUT TEMP BOTTOM VIEW Location of Probes Inside the Climate Chamber Figure 4 Michell Instruments...

  • Page 13: Filling The Water Reservoir

    OptiCal User’s Manual INSTALLATION Filling the Water Reservoir Before operation the water reservoir located on the front panel must be fi lled with distilled water (supplied with the instrument). Do not use tap water or demineralized water! Filling the Water Reservoir Figure 5 Use the fi...

  • Page 14: Draining The Water Reservoir

    To empty the water reservoir: Remove the red caps from the bottom and top of the water reservoir. Drain the water into a suitable container. Tilt the OptiCal to empty it completely. Re-fi t the red cap after emptying. Emptying the Water Reservoir...

  • Page 15: Desiccant

    OptiCal User’s Manual INSTALLATION Desiccant The OptiCal has a container fi lled with a desiccant which is used to dry the chamber air. Figure 7 Desiccant Replacement The desiccant container can be accessed by following these steps: Remove the clear plastic screw cap on the front panel.

  • Page 16: Power Supply

    OptiCal User’s Manual INSTALLATION Power Supply A single mains power supply between 85 to 264 V AC is required to operate the unit. The power supply connection is a 3 pin IEC plug located on the rear panel of the instrument.

  • Page 17: Operation

    OptiCal User’s Manual OPERATION OPERATION Preparation 3.1.1 Installing Relative Humidity Instruments for Calibration Relative humidity probes can easily be installed into the humidity chamber through the ports in the door. The amount and size of the ports are supplied per customer specifi...

  • Page 18: Start-Up

    Humidity or temperature control can be enabled or disabled individually using the associated switch. ON/OFF NOTE: Suffi cient time must be allowed for the OptiCal to thermally stabilize before monitoring the humidity and temperature readings. Auto On On Auto...

  • Page 19: Remote Control Of Chamber Temperature And Humidity Set Points

    The OptiCal temperature and humidity set points can now be controlled from the OptiCal application software. Refer to Section 3.4.3 and Section 3.4.4. NOTE: If the OptiCal is used with manual set-points, put the switches into the MAN position (refer to Section 3.3). 3.4.1 Digital Communications Located on the front panel is a 9 way ‘D’...

  • Page 20: Putting The Optidew In Remote Mode

    PC via the RS232 port is possible. 3.4.3 Remote Control - Manual Set Point Control Opti-Soft has the facility to manually control the OptiCal via the manual control window. To set the required %RH and temperature values, adjust the controls and press the button.

  • Page 21: Typical Response Times For Various Step Changes

    ≤3 ≤8 ≤10 • The time taken depends on the quality of the desiccant and the overall temperature of the OptiCal calibration chamber Time in minutes Table 1 Typical Response Times for Step Changes The OptiCal can also be used with relative humidity generation only or with temperature generation only.

  • Page 22: Control Outputs

    OptiCal User’s Manual OPERATION Control Outputs Warning: Maximum 100 mA per channel Maximum relay voltage 30 V Pin Number Description 4-20 mA temperature output (chilled mirror) 4-20 mA %RH output (chilled mirror) 0-10 V temperature output (control probe) 0-10 V %RH output (control probe)

  • Page 23: Optidew Reference Instrument

    The Optidew reference has an integral VFD (Vacuum Fluorescent Display) mounted on the front panel of the OptiCal instrument. To the right of the display is a single multi- function button which enables the user to select between the Optidew’s two modes of operation and scroll through the measured and calculated parameters such as ambient temperature or relative humidity, and indications of system status.

  • Page 24: Description Of Screens 1- 8

    OptiCal User’s Manual OPTIDEW 4.1.2 Description of Screens 1- 8 Below is a description of the parameters and system status information shown on each screen (see Figure 16). Screen 1: Displays the status of the Optidew chilled mirror reference instrument...

  • Page 25: Figure 16 Optidew Chilled Mirror Reference Display And Navigation

    OptiCal User’s Manual OPTIDEW Apply Power Optidew Transmitter Start up Initialising banner Status = MEASURE Screen 1 During DCC, Hold and Optics Alarm Mirror: 50% Screen 2 Peltier: 40% COOL 49.9 Screen 3 10.0 °C °C Screen 4 10.0 °C 106.00...

  • Page 26: Maintenance

    Failure to follow these maintenance procedures may result in premature wear or damage to the heat pump. 4.2.1 Removing the Chilled Mirror Reference Sensor for Mirror Cleaning Remove the 4 screws securing the top lid to the OptiCal. Screws Lid Screw Locations Figure 17 Disconnect the sensor cable from the Optidew sensor.

  • Page 27: Sensor Mirror Cleaning

    OptiCal User’s Manual OPTIDEW 4.2.2 Sensor Mirror Cleaning Throughout the life of the instrument, periodic cleaning of the mirror surface and optics window may be required. Sensor cleaning is mandatory if the instrument indicates an optics fault. The cleaning procedure is as follows: Switch off the instrument and remove the sensor from its sample block.

  • Page 28: Resetting The Mirror Condition

    OptiCal User’s Manual OPTIDEW 4.2.3 Resetting the Mirror Condition This is an important part of the normal operation of the instrument. The mirror condition should be reset: • after the mirror has been cleaned. • if the mirror condition shows or fl...

  • Page 29: Re-Calibration Of The Chilled Mirror Reference

    It is recommended that the entire instrument is returned to Michell Instruments on an annual basis for calibration and routine maintenance and service.

  • Page 30: Application Software

    APPLICATION SOFTWARE APPLICATION SOFTWARE The application software is an interface to the OptiCal. It provides a display of the measured and calculated parameters, system status, charting and logging, statistical information and a facility to view and change the system parameters. To set up the Digital Communications refer to Section 3.4.1.

  • Page 31: Optical Remote Chamber Control

    Hold OptiCal Remote Chamber Control The OptiCal chamber relative humidity and temperature set points can be controlled remotely from within OptiSoft. Refer to Section 3.4. Parameter Setup window allows the setting and ranging of Channel 1 and 2 mA...
  • Page 32 OptiCal User’s Manual APPLICATION SOFTWARE The Display Units and Channel 1 mA output are selected by clicking the left hand mouse button in the relevant box. This will change the settings of both the instrument and the virtual hygrometer window. Changing the mA outputs from 4-20 mA to 0-20 mA & vice versa will change both Channel 1 &...

  • Page 33: Charting And Logging

    OptiCal User’s Manual APPLICATION SOFTWARE Charting and Logging Clicking on the button in the window brings up the Chart/log Virtual Hygrometer window. Chart / log control panel Figure 22 Chart/Log Control Panel Window The chart, in its default confi guration, displays dew point, temperature and %RH.

  • Page 34: Figure 23 Chart Window

    OptiCal User’s Manual APPLICATION SOFTWARE Clicking on the button will bring up the chart as shown below. The chart shows the measured and calculated humidity values selected in the section, with an Chart assigned identifi able color for each value. It is possible to scale, zoom and scroll both X...

  • Page 35: Statistics

    OptiCal User’s Manual APPLICATION SOFTWARE Statistics Clicking on the button on the window will display the Statistics Virtual Hygrometer window as shown below: Basic statistics Figure 24 Basic Statistics Window This window shows the maximum, minimum and average of each parameter since the program began taking readings from the instrument, or since the re-set button was pressed.

  • Page 36: Calibration Correction

    APPLICATION SOFTWARE Calibration Correction The OptiCal will be delivered with a Calibration certifi cate for the Optidew chilled mirror reference instrument detailing the deviation at each measurement point from a known reference value. Data provided on the Calibration certifi cate is normally arranged as shown in the following extracts: Extract from a UKAS Calibration Certifi...
  • Page 37 OptiCal User’s Manual APPLICATION SOFTWARE window is a utility that allows an authorized user to input Calibration Correction calibration information in order to effect a real-time correction of the displayed, charted and logged data within the Opti-Soft application software. Data for dew-point temperature and ambient temperature, both in units of °C, may be entered for correction purposes, along with the original Calibration certifi...

  • Page 38: Change Of Password

    OptiCal User’s Manual APPLICATION SOFTWARE Once all necessary data has been entered in the window, click Calibration Correction on the check box and then click on Use Calibration Date to Correct Measure Values to return to the main display. Upon the next...

  • Page 39: Troubleshooting

    OptiCal User’s Manual TROUBLESHOOTING TROUBLESHOOTING Problem Possible Solution Change desiccant No drying Water in chamber; dry the chamber No humidifying Water level too low No drying and humidifying Switch 2 is off No heating or cooling Switch 3 is off...
  • Page 40 OptiCal User’s Manual APPENDIX A Appendix A Technical Specifi cations Michell Instruments...

  • Page 41: Appendix A Technical Specifi Cations

    OptiCal User’s Manual APPENDIX A Appendix A Technical Specifi cations Humidity Generated Range 10 - 90%RH ≤ ±1%RH (10 - 70%RH) Control Element Accuracy ≤ ±1.5%RH (70 - 90%RH) Stability ±0.2%RH (20 - 80%RH) Temperature +10 to +50°C (+50 to +122°F) Generated Range (lowest T set point = +10°C (+18°F) below ambient)
  • Page 42 OptiCal User’s Manual APPENDIX B Appendix B EC Declaration of Conformity Michell Instruments...

  • Page 43: Appendix Beu Declaration Of Conformity

    OptiCal User’s Manual APPENDIX B Appendix B EU Declaration of Conformity 97079 Issue 9.2, March 2016...
  • Page 44 OptiCal User’s Manual APPENDIX C Appendix C Quality, Recycling & Warranty Information Michell Instruments...

  • Page 45: Appendix C Quality, Recycling & Warranty Information

    The directives’ aim is to reduce the impact that electronic devices have on the environment. Michell Instruments is in full compliance with the WEEE Directive and is registered with an approved recycler (Registration No. WEE/JB0235YW) and treats the requirement of the directive and the protection of the environment with the utmost importance.

  • Page 46: Rohs2 Compliance

    Equipment product sold into the EU market place as 22nd July 2017. However, the careful design policy of all Michell Instruments’ products continues to attain compliance in the shortest practical timescales and strives to ensure that less than 0.1% of total mass per product, of all non-compliant materials, appear within them.

  • Page 47: Reach Compliance

    Our continued review of the SVHC Candidate List and latest additions is to ensure we remain compliant. Michell Instruments maintains a hazardous material register in which MSDS data sheets are collated, and we will check that our suppliers will comply to REACH requirements for all materials and substances we use in the processes of our manufacturing.

  • Page 48: Return Policy

    OptiCal User’s Manual APPENDIX C Return Policy If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be completed: Notify a Michell Instruments’ distributor, giving full details of the problem, the model variant and the serial number of the product.
  • Page 49 OptiCal User’s Manual APPENDIX D Appendix D Return Document & Decontamination Declaration 97079 Issue 9.2, March 2016...

  • Page 50: Appendix D Return Document & Decontamination Declaration

    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 51 NOTES:...
  • Page 52 http://www.michell.com...

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