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Michell Instruments MDM50, User Manual

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MDM50 LP Version User’s Manual

4

  

 

97475 Issue 2, April 2020

OPERATION

3.2 

Atmospheric or Line Pressure Measurements

The MDM50 is supplied with two labelled, interchangeable, gas inlet/outlet fittings.

Number

Description

1

4mm free flow fitting

2

0.4mm restricted fitting

Gas Out

Gas In

Filter Fitted

1

2

Gas Out

Gas In

Filter Fitted

2

1

ATMOSPHERIC

LINE PRESSURE

Figure 1 

Interchangeable Gas Inlet/Outlet Fittings

In order to perform measurements at line pressure, the restricted fitting should be on 

the gas outlet port. 

To perform measurements at atmospheric pressure, the restricted fitting should be on 

the gas inlet port.

!

The Gas In port is ALWAYS on the right hand side.

Summary of Contents for MDM50

Page 1: ...MDM50 Standard Version User s Manual 97475 Issue 2 April 2020 ...

Page 2: ...ation when contacting Michell Instruments for service purposes Instrument Code Serial Number Invoice Date Location of Instrument Tag Number Instrument Code Serial Number Invoice Date Location of Instrument Tag Number Instrument Code Serial Number Invoice Date Location of Instrument Tag Number ...

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 MDM50 For Michell Instruments contact information please go to www michell com ...

Page 4: ...5 6 Troubleshooting 14 Contents Safety v Electrical Safety v Pressure Safety v Toxic Materials v Repair and Maintenance v Calibration v Safety Conformity v Abbreviations vi Warnings vi Appendices Appendix A Technical Specifications 16 Appendix B Quality Recycling Warranty Information 18 B 1 Return Policy 18 B 2 Calibration Facilities 19 B 3 Manufacturing Quality 19 B 4 FCC EMC Requirements for Nor...

Page 5: ...o not allow the battery to fully discharge Pressure Safety DO NOT permit pressures greater than the safe working pressure to be applied to the instrument The specified safe working pressure is 20 barg 290 psig Refer to the Technical Specifications in Appendix A Toxic Materials The use of hazardous materials in the construction of this instrument has been minimized During normal operation it is not...

Page 6: ... lb pound mA milliampere m meter mm millimeter MPa megapascal Nl min normal liters per minute psig pound s per square inch gauge scfh standard cubic feet per hour μm micrometer Ω ohm V Volts Warnings The following general warnings listed below are applicable to this instrument They are repeated in the text in the appropriate locations Where this hazard warning symbol appears in the following secti...

Page 7: ...h a lifetime guarantee The MDM50 is powered by a rechargeable NiMH battery pack giving between 12 and 16 hours of measurement time from a full charge The instrument is delivered complete with a universal battery charger stored in the lid It takes 16 hours to fully charge the battery pack during which time the instrument can be switched on or off The charger is suitable to connect power to the inst...

Page 8: ...e following standard components are present in the packing box MDM50 2m of 6mm O D PTFE tube Battery charger Mains lead 3 pole 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 ...

Page 9: ...5 Nl min 2 and 10 6 scfh and pressures from atmospheric to 2 MPa 20 barg 290 psig 3 Connect the sample gas supply line to the instrument Gas In port 4 Connect the sample gas vent line to the instrument Gas Out port 5 Switch the instrument on The display will begin to change as the sensor responds to the applied dew point 6 Allow the gas to flow until the display shows a stable reading Typically th...

Page 10: ...itting 2 0 4mm restricted fitting Gas Out Gas In Filter Fitted 1 2 Gas Out Gas In Filter Fitted 2 1 ATMOSPHERIC LINE PRESSURE Figure 1 Interchangeable Gas Inlet Outlet Fittings In order to perform measurements at line pressure the restricted fitting should be on the gas outlet port To perform measurements at atmospheric pressure the restricted fitting should be on the gas inlet port The Gas In por...

Page 11: ... of this level and the increased amount of time to dry the system out the response times of the sensor will be significantly increased The table below offers an approximate guide to the times taken for the instrument to stabilize at a given dew point from a starting point of 10 Cdp 50 Fdp ambient Target Dew Point T100 Response Time mins C F 30 22 5 40 40 15 50 58 30 60 76 45 ...

Page 12: ...he battery pack can be recharged using the supplied charger via the battery charging socket See Section 5 6 for troubleshooting information The battery pack will charge if the instrument is switched ON or OFF 6 Analog Output Socket The MDM50 features an analog output socket that provides a linear 4 20 mA current loop scaled to 60 to 60 C 76 to 140 F dew point This allowed the instrument to be conn...

Page 13: ...ents 7 OPERATION 3 5 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 jack plug supplied and should be wired as shown below VE VE VE VE Figure 3 Jack Plug Wiring ...

Page 14: ...s contain moisture as part of their structure and when these are used as tubing for a dry gas the gas will absorb some of the moisture Always avoid using organic materials e g rubber materials containing salts and anything which has small pores which can easily trap moisture e g nylon As well as trapping moisture porous sampling materials will also allow moisture vapor to ingress into the sample l...

Page 15: ...ay as desorption peaks then decreasing at night as more moisture is adsorbed into the sampling equipment If temperatures drop below the sample dew point water may condense in sample tubing and affect the accuracy of measurements Maintaining the temperature of the sample system tubing above the dew point of the sample is vital to prevent condensation Any condensation invalidates the sampling proces...

Page 16: ...t The length of the sample line to the sensor or instrument should be as short as possible Interconnection points and valves trap moisture so using the simplest sampling arrangement possible will reduce the time it takes for the sample system to dry out when purged with dry gas Over a long tubing run water will inevitably migrate into any line and the effects of adsorption and desorption will beco...

Page 17: ...o remove the transmitter or battery pack 1 Ensure instrument is switched off and that the battery charger current output and any sampling components are also disconnected 2 Remove and retain the 10 cross head screws from the top plate 3 Lift the small battery pack cover in the top right corner of the instrument A small flat bladed screwdriver may be required to gently pry the edges of the cover if...

Page 18: ...s 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 Remove the connector block using a small screwdriver Rotate the connector block and push it back into the connector housing Take care not to trap any wires against the hole for the locking screw ...

Page 19: ...nnection View Showing Rear of Connector Terminal Block To verify if the display electronics are within calibration a 4 20mA current source can be connected in place of the transmitter 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 Servi...

Page 20: ...ircuit Check instrument electronics with 4 20mA source Exchange transmitter Display shows ErrH Transmitter reading over range Transmitter current signal 20mA Sensor element short circuit Sensor may have been exposed to saturation conditions or liquid contamination Check that filter and sensor guard are clean and dry If liquid water has contacted sensor or sensor block then disassemble and dry thor...

Page 21: ...MDM50 LP Version User s Manual Michell Instruments 15 APPENDIX A Appendix A Technical Specifications ...

Page 22: ...erating Pressure Low pressure version LP High pressure version HP 2 MPag 20 barg 290 psig 10 MPag 100 barg 1450 psig Recommended Flow Rate 1 to 5 Nl min Sampling System Configuration Pressurized or atmospheric Mechanical Specifications Ingress Protection NEMA Type 6 Display Type Flush mounted 3 5 digit red LED Carry Case Yellow Peli propylene with internal storage of charger sample tube accessorie...

Page 23: ...MDM50 LP Version User s Manual Michell Instruments 17 APPENDIX B Appendix B Quality Recycling Warranty Information ...

Page 24: ...l 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 ATEX Directive Calibration Facilities Conflict Minerals FCC Statement Manufacturing Quality Modern Slavery Statement Pressure Equipment Directive REACH RoHS3 WEEE2 Recycling Policy Warranty and Returns ...

Page 25: ...MDM50 LP Version User s Manual Michell Instruments 19 APPENDIX C Appendix C Decontamination Declaration ...

Page 26: ...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 method of cleaning decontamination Has the equipment been cleaned and decontaminated YES NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins radio activity or bio h...

Page 27: ...MDM50 LP Version User s Manual Michell Instruments 21 NOTES ...

Page 28: ...http www michell com ...

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