Related Manuals for Michell Instruments DT722
Summary of Contents for Michell Instruments DT722
- Page 1 DT722 Duct Mount RH & Temperature Transmitter User’s Manual 97332 Issue 2 January 2018...
- 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. Transmitter Code Serial Number Invoice Date Location of Instrument Tag No Transmitter 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.
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Page 4: Table Of Contents
DT722 User’s Manual Contents Safety ..........................v Electrical Safety ......................v Toxic Materials ......................v Repair and Maintenance ....................v Calibration ........................v Safety Conformity ......................v Abbreviations ........................vi Warnings ..........................vi INTRODUCTION ....................1 Features ......................1 INSTALLATION ....................2 Electrical Connections ..................2 CALIBRATION AND ADJUSTMENT PROCEDURE ............3... -
Page 5: Safety
Repair and Maintenance The instruments must be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell Instruments’ worldwide offi ces contact information. Calibration Michell Instruments recommends an annual calibration for an accuracy requirement of ±2% RH under ambient conditions where temperature is 0 to +50°C (+32 to +122°F) and relative humidity... -
Page 6: Abbreviations
DT722 User’s Manual INTRODUCTION Abbreviations The following abbreviations are used in this manual: ºC degrees Celsius ºF degrees Fahrenheit direct current gram(s) “ inch(es) pound(s) milliampere millimeters percentage ounce(s) relative humidity temperature Volts Warnings The following general warning listed below is applicable to this instrument. It is repeated in the text in the appropriate locations. -
Page 7: Features
DT722 User’s Manual INTRODUCTION INTRODUCTION The DT722 is a rugged, industrial, relative humidity and temperature transmitter designed for process applications where accurate, stable measurement and control of humidity and temperature is required. Figure 1 DT722 Features • Designed for accurate measurement in a harsh environment •... -
Page 8: Installation
NOTE: Even though the DT722 has a 5 pin connector, the standard connection cable (A000031) has only 4 pins/wires. However, only 3 pins (1, 2 and 4) are needed to connect the DT722 see Figure 3 NOTE : Both RH and T need to be connected in order for the T output to... -
Page 9: Calibration And Adjustment Procedure
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 calibration. For more information on the S503, S904 or Optical humidity generators please contact Michell Instruments (see www.michell.com for contact details). -
Page 10: Appendix A Technical Specifi Cations
DT722 User’s Manual APPENDIX A Appendix A Technical Specifi cations 97332 Issue 2, January 2018... - Page 11 DT722 User’s Manual APPENDIX A Appendix A Technical Specifications Performance Measurement Range (RH) 0–100% RH Measurement Range (T) -40 to +150°C (-40 to +302°F) Accuracy at 25°C (77°F) <±2% RH (5-95% RH) Humidity Accuracy at 25°C (77°F) ±0.2°C (±0.36°F) typical Temperature Stability –...
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Page 12: Figure 4 Dimensions
DT722 User’s Manual APPENDIX A Dimensions Dimensions Figure 4 97332 Issue 2, January 2018... -
Page 13: Figure 5 Template
DT722 User’s Manual APPENDIX A This drawing is actual size and can, therefore, be photocopied and used as a template when mounting the instrument. Template Figure 5 Michell Instruments... -
Page 14: Appendix B Quality, Recycling & Warranty Information
DT722 User’s Manual APPENDIX B Appendix B Quality, Recycling & Warranty Information 97332 Issue 2, January 2018... - Page 15 DT722 User’s Manual APPENDIX B Appendix B Quality, Recycling & 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: •...
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Page 16: Appendix C Return Document & Decontamination Declaration
DT722 User’s Manual APPENDIX C Appendix C Return Document & Decontamination Declaration 97332 Issue 2, January 2018... - Page 17 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.
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Page 18: Appendix D Recommended Practices In Humidity Measurements
DT722 User’s Manual APPENDIX D Appendix D Recommended Practices in Humidity Measurements 97332 Issue 2, January 2018... - Page 19 • Follow Michell Instruments’ care instructions for the instrument. Some instruments need routine cleaning or other maintenance. Before using any solvent cleaner, check with Michell Instruments that this will not harm the sensor or other materials of construction.
- Page 20 DT722 User’s Manual APPENDIX D • Avoid using instruments in direct sunlight or near any other source of heat, unless they are suitably shielded to prevent measurement errors. Sampling in general • Relative humidity measurements should be carried out at a representative temperature.
- Page 21 DT722 User’s Manual APPENDIX D Relative humidity in general • Due care must be taken of temperature. The effect of temperature on humidity is highly significant. Failure to take this into account can sometimes lead to errors so large that the measurement is meaningless.
- Page 22 DT722 User’s Manual APPENDIX D Practical recommendations for specifi c types of hygrometer Relative humidity capacitive sensor • Care should be taken to avoid mechanical shock (impact) or thermal shock (sudden temperature changes). Sensors should be protected from steam or water sprays, and from direct sunlight.
- Page 23 Laboratory Use Part 1: General Requirements Robert-Jan Pouw RH Business Manager. Michell Instruments Benelux B.V. Oosterhout The Netherlands Date of Issue 6 December 2017 ___________________________________ on behalf of Peter Haakma Managing Director Michell Instruments Benelux B.V. EUD DT722 Issue 05...
- Page 24 http://www.michell.com...
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