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OptiCal User’s Manual

Michell Instruments

 

 

21

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 

LOW

 or 

fl

 ashing 0% on the display or 

application software during a DCC cycle.

• 

if the mirror condition is greater than 10% during a DCC cycle.

Remote Communications

Optics Adjustment

On

Off

h

Potentiometer

Figure 19 

Potentiometer Location

Procedure (using display or application software)

NOTE: The instructions on the next page can be followed for adjustment using 

RS232 serial commands, if more convenient.

1. 

Clean the mirror according to the instructions above.

2. 

Cycle power to the instrument to initiate a DCC cycle.

The instrument will now be in DCC for 4 minutes – it is important that the 

adjustments are only made in this mode. If the instrument comes out of 

DCC (the status LED will no longer be illuminated), just cycle power to the 

instrument.

3. 

Observe the mirror condition on the display, or the application software.

4. 

Adjust the potentiometer until the mirror condition is 0 - 2%.

If the mirror condition shows 

LOW

 (on the display) or 

fl

 ashing 0% (on the 

application software) then it is under-range and a positive adjustment is 

required.

NOTE: During adjustment there will be a delay of approximately 

5 seconds before the mirror condition value updates to the actual 

value.

5. 

Cycle power to the instrument.

Содержание OptiCal

Страница 1: ...tion Desiccant Charge Humidity Yellow De Humidify Green Heating Yellow Cooling Green Chamber Set Humidity Display Control Chamber Set Temperature rh C Auto On On Auto Man Off Off Man OPTI CAL integrat...

Страница 2: ...nformation when contacting Michell Instruments for service purposes Instrument Code Serial Number Invoice Date Location of Instrument Tag No Instrument Code Serial Number Invoice Date Location of Inst...

Страница 3: ...td 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...

Страница 4: ...midity Set Points 12 3 4 1 Digital Communications 12 3 4 2 Putting the Optidew in Remote Mode 13 3 4 3 Remote Control Manual Set Point Control 13 3 4 4 Remote Control Automatic Set Point Control 13 3...

Страница 5: ...17 Lid Screw Locations 19 Figure 18 Sensor Mirror Cleaning 20 Figure 19 Potentiometer Location 21 Figure 20 Virtual Hygrometer Window 23 Figure 21 Parameter Setup Window 24 Figure 22 Chart Log Control...

Страница 6: ...264 V AC 47 63 Hz Toxic Materials The use of hazardous materials in the construction of this instrument has been minimized During normal operation it is not possible for the user to come into contact...

Страница 7: ...pounds mA milli Ampere max maximum min minimum mm millimeter N C normally closed N O normally open percentage RH relative humidity RS232 serial data transmission standard T temperature USB Universal...

Страница 8: ...ameters measured by the reference instrument in various relative and absolute humidity units alongside the temperature within the chamber The humidity and temperature set points can be controlled eith...

Страница 9: ...ater reservoir 3 Optidew chilled mirror reference VFD display 4 Desiccant cell and indicator window 5 Display control 6 Relative humidity set point RH 7 A Manual auto switches for relative humidity te...

Страница 10: ...ns 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 Desiccant cell...

Страница 11: ...t any water in the reservoir is drained and that the RH control probe and the temperature probe in the chamber are removed The OptiCal should NOT be moved while in operation 2 1 Installing the Relativ...

Страница 12: ...Manual Michell Instruments 5 INSTALLATION GND OUTPUT TEMP SUPPLY 8 35 VDC OUTPUT RH BOTTOM VIEW TOP VIEW Control Probe Connector Temperature Probe Connector h h Figure 4 Location of Probes Inside the...

Страница 13: ...neralized water Figure 5 Filling the Water Reservoir Use the filter bottle supplied to fill the water reservoir 1 Remove the red plastic cap from the top of the reservoir 2 Carefully fill with clean d...

Страница 14: ...1 Remove the red caps from the bottom and top of the water reservoir 2 Drain the water into a suitable container 3 Tilt the OptiCal to empty it completely 4 Re fit the red cap after emptying Figure 6...

Страница 15: ...ion that the instrument s ability to generate low humidity is reduced It is recommended that the silica gel is replaced or regenerated at this time The silica gel can be regenerated by emptying it com...

Страница 16: ...e ON OFF switch and the power input fuse are in the same location adjacent to the power socket A 3 core power cable is provided the free end of which should be wired to a suitable earthed plug or dire...

Страница 17: ...g used should be covered with a blind stop to exclude temperature and relative humidity influences from outside the chamber NOTE If a door without ports A000268 is used the probes under calibration mu...

Страница 18: ...he AUTO MAN switches are in the MAN position Humidity or temperature control can be enabled or disabled individually using the associated ON OFF switch NOTE Sufficient time must be allowed for the Opt...

Страница 19: ...fer to Section 4 1 5 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 wi...

Страница 20: ...s 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 t...

Страница 21: ...he 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 als...

Страница 22: ...illed mirror 2 0 V 3 4 20 mA RH output chilled mirror 4 0 V 5 N C 6 0 10 V temperature output control probe 7 0 V 8 0 10 V RH output control probe 9 Chilled mirror clean optics alarm relay N O 10 Chil...

Страница 23: ...connector Start up banner When power is applied to the OptiCal the Optidew reference display will initially show test characters for approximately 0 5 seconds after which the start up banner will be...

Страница 24: ...ature on the dew point COOL indicates the system is depressing the heat pump in order to form dew on the mirror surface HEAT indicates a rapid increase in dew point level whereby the system needs to i...

Страница 25: ...Mirror 50 Peltier 40 COOL rh 49 9 t 10 0 C tdp 0 0 C t 10 0 C Y 106 00 gkg 1 t 10 0 C dv 106 00 gm 3 t 10 0 C t tdp 10 0 C t 10 0 C aw 0 5 t 10 0 C During DCC Hold and Optics Alarm h h Start up banner...

Страница 26: ...eat pump 4 2 1 Removing the Chilled Mirror Reference Sensor for Mirror Cleaning 1 Remove the 4 screws securing the top lid to the OptiCal Screws Figure 17 Lid Screw Locations 2 Disconnect the sensor c...

Страница 27: ...ument and remove the sensor from its sample block 2 Clean the mirror surface and optics window with a cotton bud Q Tip soaked in distilled water If the sensor has been exposed to oil based contaminati...

Страница 28: ...erial commands if more convenient 1 Clean the mirror according to the instructions above 2 Cycle power to the instrument to initiate a DCC cycle The instrument will now be in DCC for 4 minutes it is i...

Страница 29: ...o the instrument 4 2 4 Re calibration of the Chilled Mirror Reference As with all high quality measuring instruments regular re calibrations of the integral chilled mirror reference against a standard...

Страница 30: ...ameter Setup window see Section 5 3 When the software is executed it will default to the present setting of Channel 1 mA output The ambient temperature is constantly shown in the lower display NOTE Th...

Страница 31: ...parameters to be viewed See Section 5 5 Charting and logging of the measured values can be initiated by clicking on the Chart log button See Section 5 4 The Hold display in DCC mode check box stops th...

Страница 32: ...atmospheric pressure the display and Channel 1 mA output if either gm 3 or gkg 1 is selected will both be corrected accordingly The Alarm can be set to OFF or set to be active on any of the process v...

Страница 33: ...al section you can select the charting and logging interval from a minimum of 5 seconds to a maximum of 1 hour It offers the facility to log the temperature of the mirror while in DCC and Hold or hold...

Страница 34: ...d max values or selecting a parameter in the Auto scale list which scales the Y axis to the actual values of the parameter There are a number of modes associated with the chart which can be selected f...

Страница 35: ...istics 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 5 6 Control Paramet...

Страница 36: ...ollowing extracts Extract from a UKAS Calibration Certificate Generated Dew point C Test Hygrometer Dew point Temperature C Sensor Temperature C Correction Required C Expanded Uncertainty C 39 89 40 1...

Страница 37: ...Ref Dew point data for the reference hygrometer used to calibrate the Optidew sometimes called the actual dew point or the standard DP Reading Measured dew point value of the Optidew under test Temp...

Страница 38: ...e display will indicate this fact To remove Calibration Correction de select the check box and click on Apply then on Close Figure 26 Calibration Correction Window NOTE Enter the calibration data in d...

Страница 39: ...on No drying Change desiccant 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 No display Fuse on bac...

Страница 40: ...OptiCal User s Manual Michell Instruments 33 APPENDIX A Appendix A Technical Specifications...

Страница 41: ...Reference Accuracy Dew Point 0 2 C Temperature 0 1 C Measurement Units Dew point C F RH temperature C F gm 3 gkg 1 water activity aW Outputs Analog 4 20 mA or 0 20 mA over user settable output Accurac...

Страница 42: ...OptiCal User s Manual Michell Instruments 35 APPENDIX B Appendix B EC Declaration of Conformity...

Страница 43: ...OptiCal User s Manual 36 97079 Issue 9 2 March 2016 APPENDIX B Appendix B EU Declaration of Conformity...

Страница 44: ...OptiCal User s Manual Michell Instruments 37 APPENDIX C Appendix C Quality Recycling Warranty Information...

Страница 45: ...ich may be harmful to the environment Similarly we are increasingly using recyclable and or recycled material in our business and products wherever it is practical to do so To protect natural resource...

Страница 46: ...tive 2011 65 EU Article 3 24 defines Control and Monitoring Equipment specifically as monitoring and control instruments designed exclusively for industrial or professional use RoHS2 EU Directive 2011...

Страница 47: ...tains 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 process...

Страница 48: ...of action will be taken If the fault is covered under the terms of the warranty the instrument will be repaired at no cost to the owner and returned If Michell Instruments determines that the fault i...

Страница 49: ...OptiCal User s Manual 42 97079 Issue 9 2 March 2016 APPENDIX D Appendix D Return Document Decontamination Declaration...

Страница 50: ...cals YES NO Radioactive substances YES NO Other hazards YES NO Please provide details of any hazardous materials used with this equipment as indicated above use continuation sheet if necessary Your me...

Страница 51: ...NOTES...

Страница 52: ...http www michell com...

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