Michell Instruments MDM50-HP User Manual Download Page 20

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MDM50 HP Version User’s Manual

97478 Issue 1.4, October 2019

MAINTENANCE

5.6

Troubleshooting

Symptom

Cause

Actions

Display shows “

ErrI

”

Transmitter disconnected

or sensor element /

sensor thermistor fault.

NOTE: This error is

normally displayed

during the first few

seconds while the

instrument is starting

up.

Check transmitter cable is securely

connected inside instrument.

Check instrument electronics with

4-20mA source.

Exchange transmitter.

Display shows “

ErrL

”

Transmitter reading

under-range.

Transmitter current

signal

< 4mA.

Transmitter element

open circuit.

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 thoroughly. After drying, it

is recommend to purge assembled

instrument with very dry (-75°Cdp

(-103°Fdp) / 1ppm

moisture) air for

12 to 24 hours.

Exposure to other contaminants can

cause lasting damage and may require

transmitter to be exchanged.

Check instrument electronics with

4-20mA source.

Display flickers on

and off

Battery voltage low.

Connect charger.

Summary of Contents for MDM50-HP

Page 1: ...MDM50 High Pressure Version User s Manual 97478 Issue 1 4 October 2019 nbn Austria GmbH ...

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: ...td 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 HP For Michell Instruments contact information please go to www michell com ...

Page 4: ... Electronics Calibration 14 5 5 List of Spares 14 5 6 Troubleshooting 15 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 Appendix C Decontamination Declaration 20 Figures Figure 1 Swa...

Page 5: ...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 300 barg 4350 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: ...am 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 sec...

Page 7: ...ntee The MDM50 HP 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 instrument indefini...

Page 8: ...rule end of the port connector 2 Insert the port connector into the end connection and finger tighten the nut 3 While holding the fitting body steady tighten the nut one quarter turn Do not use the Swagelok gap inspection gauge with machined ferrule ends 1 Slip the nut over the machined ferrule end of the port connector 2 Insert the port connector into the end connection and finger tighten the nut...

Page 9: ... at the 6 o clock position While holding the fitting body steady tighten the nut 1 turns to the 9 o clock position NOTE Connect the machined ferrule end before connecting the tube adaptor end 4 Insert the tube adaptor until it rests firmly on the shoulder of the Swagelok tube fitting body Finger tighten the nut 5 Mark the nut at the 6 o clock position While holding the fitting body steady tighten ...

Page 10: ... gas supply line to the instrument Gas In port 5 Connect the sample gas vent line to the instrument Gas Out port 6 Switch the instrument on The display will begin to change as the sensor responds to the applied dew point 7 Allow the gas to flow until the display shows a stable reading Typically this would be around 15 to 30 minutes for spot checks at dew points of 40 C 40 F and above 8 Switch the ...

Page 11: ...ints 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 ...

Page 12: ...rument it can be accessed by removing two screws 5 The 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 HP features an analog output socket that provides a linear 4 20 mA current loop scaled to 60 to 60 C 76 to...

Page 13: ...nts 7 OPERATION 3 4 4 20 mA Output Socket Wiring The MDM50 HP 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: ...ials 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 sampl...

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: ...ent 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 be...

Page 17: ...To 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 i...

Page 18: ...ons 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: ...onnection 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 Serv...

Page 20: ... circuit 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 th...

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

Page 22: ...ating Conditions Operating Temperature 20 to 50 C 4 to 122 F Storage Temperature 40 to 75 C 40 to 167 F Operating Pressure Up to 30 MPa 300 barg 4350 psig Mechanical Specifications Display Flush mounted 3 5 digit red LED Case Yellow propylene with charger sample tubing and output connector stored in the lid Weight 4kg 8 8lbs total weight Enclosure Rating Case Closed NEMA Type 6 Sample Connections ...

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

Page 24: ...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 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 HP Version User s Manual Michell Instruments 19 APPENDIX C Appendix C Decontamination Declaration ...

Page 26: ...s 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...

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

Page 28: ...bn at www nbn at Tel 43 316 402805 Fax 43 316 402506 Riesstraße 146 8010 Graz nbn Austria GmbH Aufgrund laufenderWeiterentwicklungen sind Änderungen der Spezifikationen vorbehalten Alle Angaben vorbehaltlich Satz und Druckfehler ...

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