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Summary of Contents for Michell Instruments MDM50
- Page 1 MDM50 Standard Version User’s Manual 97475 Issue 2 April 2020...
- 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. Instrument Code Serial Number Invoice Date Location of Instrument Tag Number Instrument Code Serial Number Invoice Date...
- Page 3 © 2020 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
GOOD MEASURING PRACTICE ................8 MAINTENANCE ....................11 Calibration ....................... 11 Transmitter / Battery Replacement ..............11 Filter Cartridge Replacement ................13 Checking the MDM50 Electronics Calibration ............13 List of Spares ....................13 Troubleshooting ....................14 Figures Figure 1 Interchangeable Gas Inlet/Outlet Fittings .............4 Figure 2 User Controls .....................6... -
Page 5: Safety
Michell Instruments’ worldwide offices contact information. Calibration The recommended calibration interval for the MDM50 is one year, unless otherwise specified by Michell Instruments Ltd. The instrument should be returned to the manufacturer, Michell Instruments, or one of their accredited service agents for re-calibration (go to www.michell.com for contact information). -
Page 6: Abbreviations
MDM50 LP Version User’s Manual Abbreviations The following abbreviations are used in this manual: alternating current pressure unit (atmosphere) barg pressure unit (=100 kP or 0.987 atm) gauge °C degrees Celsius °F degrees Fahrenheit dew point feet kilogram pound milliampere... -
Page 7: Introduction
This process, and subsequent quality testing, ensures that all sensors behave optimally before they are used in the field. Each MDM50 is supplied with a calibration certificate traceable to national standards (NIST) from Michell Instruments' accredited laboratory. -
Page 8: Installation
3 pole ¼” jack plug (inside lid) - for analog output connections • Certificate of calibration Before using the MDM50 for the first time it is recommended that the battery pack is charged for a minimum of 12 hours. 97475 Issue 2, April 2020... -
Page 9: Operation
Failure to do so will affect the instrument's pressure rating. General Operation To operate the MDM50, follow these instructions: Ensure that all gas fittings are fully tightened before use. Gas under test should be restricted to flow rates between 1 and 5 Nl/min (2 and 10.6 scfh) and pressures from atmospheric to 2 MPa (20 barg (290... -
Page 10: Atmospheric Or Line Pressure Measurements
MDM50 LP Version User’s Manual OPERATION Atmospheric or Line Pressure Measurements The MDM50 is supplied with two labelled, interchangeable, gas inlet/outlet fittings. Number Description 4mm free flow fitting 0.4mm restricted fitting Gas Out Gas In Filter Fitted LINE PRESSURE ... -
Page 11: Measuring Dew Points Below -40°C (-40°F)
MDM50 LP Version User’s Manual OPERATION Measuring Dew Points Below -40°C (-40°F) Due to the significantly lower levels of moisture present at dew points of this level, and the increased amount of time to dry the system out, the response times of the sensor will be significantly increased. -
Page 12: User Controls
PC to enable dew-point trends to be analyzed over time. For wiring information see Section 3.5. The MDM50 can be used for measurements at line pressure (up to 20 barg (290 psig)) or atmospheric pressure. Legris push fittings... -
Page 13: 4-20 Ma Output Socket Wiring
MDM50 LP Version User’s Manual OPERATION 4-20 mA Output Socket Wiring The MDM50 provides a linear 4-20 mA output scaled from -60 to +60°C (-76 to +140°F). The socket accepts a 3 pole ¼” jack plug (supplied) and should be wired as shown below: ... -
Page 14: Good Measuring Practice
MDM50 LP Version User’s Manual GOOD MEASUREMENT PRACTICE GOOD MEASURING PRACTICE Ensuring reliable and accurate moisture measurements requires the correct sampling techniques, and a basic understanding of how water vapor behaves. This section aims to explain the common mistakes and how to avoid them. - Page 15 MDM50 LP Version User’s Manual GOOD MEASUREMENT PRACTICE Temperature and Pressure effects As the temperature or pressure 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 16 MDM50 LP Version User’s Manual GOOD MEASUREMENT PRACTICE • Accentuate adsorption and desorption effects on the gas passing through the sampling system. • Allow pockets of wet gas to remain undisturbed in a complex sampling system, which will then gradually be released into the sample flow.
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Page 17: Maintenance
MDM50 LP Version User’s Manual MAINTENANCE MAINTENANCE Routine maintenance of the MDM50 is confined to regular re-calibration of the internal, removable SF82 transmitter and replacement of the filter cartridge. Calibration The calibration of the internal transmitter is traceable to national standards. For this reason it should only be calibrated in an accredited, e.g. - Page 18 MDM50 LP Version User’s Manual MAINTENANCE If the front panel prevents the connector from fitting onto the transmitter, follow the instructions below: • Completely unscrew the cable gland on the GDSN connector to release the cable tension. • Remove the locking screw from the back of the connector (retaining the metal O-ring).
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Page 19: Filter Cartridge Replacement
At 4 mA the display should show -60.0°Cdp ±0.5°C (-76.0°Fdp ±0.9°F) At 20 mA the display should show +60.0°Cdp ±0.5°C (+140.0°Fdp ±0.9°F) If the displayed values are outside of this range, please contact Michell Instruments' Service Department. List of Spares... -
Page 20: Troubleshooting
MDM50 LP Version User’s Manual MAINTENANCE Troubleshooting Symptom Cause Actions Transmitter disconnected or sensor element / Check transmitter cable is securely sensor thermistor fault. connected inside instrument. NOTE: This error is Check instrument electronics with Display shows “ ErrI ”... -
Page 21: Appendix A Technical Specifications
MDM50 LP Version User’s Manual APPENDIX A Appendix A Technical Specifications Michell Instruments... - Page 22 MDM50 LP Version User’s Manual APPENDIX A Appendix A Technical Specifications Performance Specifications Measurement Range -60 to +20°C dew point (-76 to +68°F dew point) Accuracy ±2°C (±3.6°F) dew point Response time T95 to -60 °C (-76 °F) dew point in <3 minutes Repeatability 0.5 °C (33 °F) dew point...
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Page 23: Appendix B Quality, Recycling & Warranty Information
MDM50 LP Version User’s Manual APPENDIX B Appendix B Quality, Recycling & Warranty Information Michell Instruments... -
Page 24: Calibration Facilities
MDM50 LP Version 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: •... -
Page 25: Appendix C Decontamination Declaration
MDM50 LP Version User’s Manual APPENDIX C Appendix C Decontamination Declaration Michell Instruments... - Page 26 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 materials. For most applications involving solvents, acidic, basic, flammable or toxic gases a simple purge with dry gas (dew point <-30°C) over 24 hours should be sufficient to decontaminate the unit prior to return.
- Page 27 MDM50 LP Version User’s Manual NOTES Michell Instruments...
- Page 28 http://www.michell.com...
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