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MDM25 User Manual

Michell Instruments

7

INSTALLATION

2.4

Mounting and Connecting the Probe

All probes insert directly into the connector on the top of the MDM25.

Align the locating peg with the locating notch and then rotate the knurled thumb wheel

until the probe is securely held in place.

Locating Peg



Locating Notch



Figure 4

Probe Connections

WARNING: Do not over-tighten as this could cause damage

to the probe body.

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Содержание MICHELL Instruments MDM25

Страница 1: ...MDM25 Hygrometer User Manual RH Ta Abs H 53 1 21 0 C 9 7g M 3 MDM25 Hygrometer 97234 Issue 4 1 February 2022 ...

Страница 2: ... contacting Michell Instruments for service purposes Product Name Order Code Serial Number Invoice Date Installation Location Tag Number Product Name Order Code Serial Number Invoice Date Installation Location Tag Number Product Name Order Code Serial Number Invoice Date Installation Location Tag Number ...

Страница 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 MDM25 For Michell Instruments contact information please go to www michell com ...

Страница 4: ...ument Display 3 1 2 Display Units 4 1 3 Display Settings 4 1 4 Device Settings 4 1 5 About 4 2 INSTALLATION 5 2 1 Unpacking the Instrument 5 2 2 MDM25 Accessories 5 2 3 Battery Requirements 6 2 3 1 Fitting the Batteries 6 2 4 Mounting and Connecting the Probe 7 3 OPERATION 8 3 1 Preparation for Operation 8 3 2 Overall Menu Structure 8 3 2 1 Display Settings 9 3 2 2 Device Settings 10 3 2 3 About 1...

Страница 5: ...ndix C Analyzer Return Document Decontamination Declaration 18 Figures Figure 1 Controls and Indicators 2 Figure 2 Display 3 Figure 3 Battery Compartment Location 6 Figure 4 Probe Connections 7 Figure 5 Main Menu Structure 8 Figure 6 Display Settings Menu 9 Figure 7 Device Settings Menu 10 Figure 8 About Menu 11 Tables Table 1 Unit Descriptions 4 ...

Страница 6: ...ufacturer for use with the instrument Pressure Safety This product is not suitable for use at pressures greater than atmospheric Toxic Materials The use of hazardous materials in the construction of this instrument has been minimized During normal operation it is not possible for the user to come into contact with any hazardous substance which might be employed in the construction of the instrumen...

Страница 7: ...illimeters oz ounce RH relative humidity sec second s T temperature Ta ambient temperature Td dew point Tw wet bulb temperature V Volts percentage 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 sections it is used to indicate areas where poten...

Страница 8: ...ions The hygrometer is contained within a molded ABS housing with a rubber surround for drop protection sealed to IP54 standards The rubber surround allows for comfortable hand held operation and safe transportation of the unit It is powered by 3 alkaline AA size cells which are designed to last a minimum of 150 continuous hours between replacement Continuous battery charge status indication is pr...

Страница 9: ... the MDM25 hygrometer are located on the front panel The probe connection to the MDM25 hygrometer is made to the top panel and the battery charger cover is located on the rear of the instrument Figure 1 shows the layout of the controls 1 2 3 4 5 6 1 Display 2 Left and Exit Key 3 Enter Key 4 Down Key 5 Up Key 6 Power Key Figure 1 Controls and Indicators ...

Страница 10: ... Charge Indicator Icon displays 3 dots when full When battery icon is empty replace the batteries 2 RH Display 3 Temperature Display 4 3rd Output Display presents the selected 3rd output either in ºC ºF Td g m3 or ºC ºF TW Battery Indicator Full battery power 2 3 battery power 1 3 battery power Replace batteries Figure 2 Display ...

Страница 11: ... dew or condensation forms on cooling a gas This is therefore the temperature at which air becomes saturated in equilibrium with water Absolute Humidity Abs H g m3 The mass of water vapor present in unit volume of moist air of a given temperature and pressure SI metric units are grams of water per cubic meter of air g m3 Wet Bulb temperature Tw ºC or ºF Temperature indicated by a thermometer sheat...

Страница 12: ...al 2 2 MDM25 Accessories Filters and Protection Caps For 12mm probe For 19mm probe Slotted protection cap black Slotted protection cap black Mesh filter Mesh filter Flat SS sintered dust filter Flat SS sintered dust filter Arrow 20μm SS sintered filter Arrow 10μm SS sintered filter Arrow 20μm SS sintered filter PVDF filter Probes Fixed probe Standard probe Sword type probe Remote high temperature ...

Страница 13: ... a high energy density and long shelf life Do not mix different type of batteries All three batteries must be of the same type 2 3 1 Fitting the Batteries Unscrew the battery compartment and insert the three AA cells according to the image on the inside of the battery compartment Refit the compartment cover ensuring the seal is fully compressed Figure 3 Battery Compartment Location ...

Страница 14: ... directly into the connector on the top of the MDM25 Align the locating peg with the locating notch and then rotate the knurled thumb wheel until the probe is securely held in place Locating Peg Locating Notch Figure 4 Probe Connections WARNING Do not over tighten as this could cause damage to the probe body ...

Страница 15: ...t temperature Ta If using the MDM25 alongside the S503 RH calibrator adjust the display orientation to allow for the product to be read correctly when upside down If there is there is no reading on the screen check the battery orientation Replace with new batteries if required 3 2 Overall Menu Structure DISPLAY DEVICE ABOUT CONTRAST AUTO OFF TEMP UNITS 3RD VALUE FIRMWARE VERSION BACKLIGHT DISPLAY ...

Страница 16: ... 5 bright DISPLAY ORIENTATION Press Press Press Press Special feature The display turns automatically when hand meter is positioned upside down To store these settings in the memory press the Menu button which will open the Main page When the hand meter is turned on again this setting is saved To store the settings for ONLY the current session press the Left Key The orientation of the display can ...

Страница 17: ...0 Steps of 5 mins from 10 to 20 AUTO OFF disabled TEMP UNITS By pressing the Up and Down Keys temperature units can be selected as either Celcius or Fahrenheit 3RD VALUE By pressing the Up and Down Keys the 3rd value option can be set to read Dew point Abs Hum Wet Bulb or None Press Press Press Press To store these settings in the memory press the Menu button to return to the Main page When the ha...

Страница 18: ...ON 3 2 3 About ABOUT FIRMWARE VERSION View the ﬁrmware version and serial number of the hand meter This number relates to the hand held unit ONLY not the attached probe Press Press Press the Menu button to return to the Main page Figure 8 About Menu ...

Страница 19: ...amage Care should be taken to avoid mechanical shock impact or thermal shock sudden temperature changes 4 1 Probe Calibration Salt solutions are commonly used for the calibration of RH sensors Michell Instruments calibration Control Kit is available to provide a traceable reference to verify the accuracy of the probe The Control Kit can be purchased from Michell Instruments for contact information...

Страница 20: ...MDM25 User Manual Michell Instruments 13 APPENDIX A Appendix A Technical Specifications ...

Страница 21: ...ration Electrical Connections M9 5 way binder connector PROBES Performance Measurement Range RH 0 100 rh Accuracy at 25 C 77 F Temperature 0 2 C 0 36 F Stability RH Sensor 1 rh year Response time RH Sensor 10 sec typical for 90 of the step change Measurement Operating Range T Fixed and Standard Probe Sword Probe Remote Probe 20 80 C 4 176 F 20 100 C 4 212 F 20 150 C 4 302 F Accuracy at 25 C 77 F H...

Страница 22: ...MDM25 User Manual Michell Instruments 15 APPENDIX B Appendix B Quality Recycling Warranty Information ...

Страница 23: ...ation can be found on our website at www michell com compliance This page contains information on the following directives Anti Facilitation of Tax Evasion Policy ATEX Directive Calibration Facilities Conflict Minerals FCC Statement Manufacturing Quality Modern Slavery Statement Pressure Equipment Directive REACH RoHS3 WEEE2 Recycling Policy Warranty and Returns This information is also available ...

Страница 24: ...MDM25 User Manual Michell Instruments 17 APPENDIX C Appendix C Analyzer Return Document Decontamination Declaration ...

Страница 25: ...emicals 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 ...

Страница 26: ...MDM25 User Manual Michell Instruments 19 NOTES ...

Страница 27: ...http www michell com www ProcessSensing com ...

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