Michell Instruments DT722 User Manual Download

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DT722

Duct Mount

RH & Temperature Transmitter

User’s Manual

97332 Issue 2

January 2018

Summary of Contents for DT722

Page 1: ...DT722 Duct Mount RH Temperature Transmitter User s Manual 97332 Issue 2 January 2018...

Page 2: ...formation when contacting Michell Instruments for service purposes Transmitter Code Serial Number Invoice Date Location of Instrument Tag No Transmitter Code Serial Number Invoice Date Location of Ins...

Page 3: ...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: ...1 Electrical Connections 2 3 CALIBRATION AND ADJUSTMENT PROCEDURE 3 3 1 Calibration and Adjustment 3 Figures Figure 1 DT722 1 Figure 2 Electrical Connections 2 Figure 3 Connections 3 Figure 4 Dimensio...

Page 5: ...dous materials in the construction of this instrument has been minimized During normal operation it is not possible for the user to come into contact with any hazardous substance which might be employ...

Page 6: ...b pound s mA milliampere mm millimeters percentage oz ounce s RH relative humidity T temperature V Volts Warnings The following general warning listed below is applicable to this instrument It is repe...

Page 7: ...le measurement and control of humidity and temperature is required Figure 1 DT722 1 1 Features Designed for accurate measurement in a harsh environment Can withstand temperatures up to 150 C 300 F Sta...

Page 8: ...NOT CONNECT for calibration only Green Pin 4 Output 1 RH 4 20 mA max 500 Pin 5 DO NOT CONNECT for calibration only NOTE Even though the DT722 has a 5 pin connector the standard connection cable A0000...

Page 9: ...ore frequent calibration is recommended A humidity generator Michell Instruments S503 S904 or Optical used in combination with a general reference handheld hygrometer is ideal for a quick and accurate...

Page 10: ...DT722 User s Manual 4 97332 Issue 2 January 2018 APPENDIX A Appendix A Technical Specifications...

Page 11: ...fications Output Signal 4 20 mA Supply Voltage 8 to 32 V DC Supply Voltage Influence 0 01 RH V typical Operating Specifications Operating Humidity Probe Housing Storage 10 to 95 RH non condensing Oper...

Page 12: ...DT722 User s Manual 6 97332 Issue 2 January 2018 APPENDIX A Dimensions Figure 4 Dimensions...

Page 13: ...DT722 User s Manual Michell Instruments 7 APPENDIX A This drawing is actual size and can therefore be photocopied and used as a template when mounting the instrument Figure 5 Template...

Page 14: ...DT722 User s Manual 8 97332 Issue 2 January 2018 APPENDIX B Appendix B Quality Recycling Warranty Information...

Page 15: ...ves Full information can be found on our website at www michell com compliance This page contains information on the following directives ATEX Directive Calibration Facilities Conflict Minerals FCC St...

Page 16: ...DT722 User s Manual 10 97332 Issue 2 January 2018 APPENDIX C Appendix C Return Document Decontamination Declaration...

Page 17: ...als 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 met...

Page 18: ...DT722 User s Manual 12 97332 Issue 2 January 2018 APPENDIX D Appendix D Recommended Practices in Humidity Measurements...

Page 19: ...s may require from only a few minutes to many hours Follow Michell Instruments care instructions for the instrument Some instruments need routine cleaning or other maintenance Before using any solvent...

Page 20: ...t must be avoided These can result in overestimates of the humidity of the air between the droplets Such results may exceed 100 RH or may be impossible to interpret meaningfully Droplets of liquid als...

Page 21: ...ow humidity anything much below a dew point of 0 C the amounts of water given off by organic and porous materials can dramatically affect the value of humidity The lower the level of moisture the more...

Page 22: ...ilters and saturation guarding may protect the sensor but these actions carry a risk of damage by condensation or other contamination Protective filters can slow the response time of sensors This can...

Page 23: ...signed to be in conformance with the relevant sections of the following standards or other normative documents EN61326 1 2013 Electrical equipment for measurement control and laboratory use EMC requir...

Page 24: ...http www michell com...