Michell Instruments MDM50, User Manual

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MDM50 LP Version User’s Manual
iv 97475 Issue 2, April 2020
1 INTRODUCTION ................................................................................................ 1
2 INSTALLATION ..................................................................................................2
3 OPERATION ......................................................................................................
3
3.1 General Operation .............................................................................................. 3
3.2 Atmospheric or Line Pressure Measurements ........................................................ 4
3.3 Measuring Dew Points Below -40°C (-40°F) .......................................................... 5
3.4 User Controls ..................................................................................................... 6
3.5 4-20 mA Output Socket Wiring ............................................................................ 7
4 GOOD MEASURING PRACTICE ............................................................................ 8
5 MAINTENANCE ................................................................................................ 11
5.1 Calibration ....................................................................................................... 11
5.2 Transmitter / Battery Replacement ..................................................................... 11
5.3 Filter Cartridge Replacement ............................................................................. 13
5.4 Checking the MDM50 Electronics Calibration ....................................................... 13
5.5 List of Spares ................................................................................................... 13
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 North America) .................................. 19
Appendix C Decontamination Declaration ......................................................................21
Figures
Figure 1 Interchangeable Gas Inlet/Outlet Fittings ..................................................... 4
Figure 2 User Controls ............................................................................................. 6
Figure 3 Jack Plug Wiring ......................................................................................... 7
Figure 4 Material Permeability Comparison ................................................................ 8
Figure 5 2-Wire Connection - View Showing Rear of Connector Terminal Block ........... 13