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MDM300

Advanced Dew-Point Hygrometer

User Manual

97122 Issue 16.2

June 2022

Summary of Contents for MICHELL Instruments MDM300

Page 1: ...MDM300 Advanced Dew Point Hygrometer User Manual 97122 Issue 16 2 June 2022 ...

Page 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 ...

Page 3: ... 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 MDM300 Advanced Dew Point Hygrometer For Michell Instruments contact information please go to www michell com ...

Page 4: ...2 4 2 Charger Electrical Requirements 12 2 5 Instrument Gas Connections 12 2 5 1 Gas Inlet Outlet Fittings 13 2 6 Connect External Transmitters 14 2 6 1 Set Up Pressure Transmitter Parameters 14 2 6 2 Set Up External Temperature Transmitter Parameters 15 2 6 3 Set Up External Dp Easidew Transmitter Parameters 15 2 6 4 Entering User Pressure 16 2 6 5 Connecting your own Temperature or Pressure Tran...

Page 5: ...One Point Adjustment 48 7 SHIPPING 49 Tables Table 1 Controls and Indicators 4 Table 2 Instrument Display Descriptions 6 Table 3 Adaptor Fittings 12 Table 4 SETTINGS Parameters 23 Table 5 LOGGING Parameters 24 Table 6 BLUETOOTH Parameters 25 Table 7 EXTERNAL Sensor Parameters 27 Table 8 CLOCK Parameters 28 Table 9 HMI Parameters 29 Table 10 MDM300 Default Parameters 33 Table 11 MDM300 Measurement ...

Page 6: ...e 23 Figure 18 LOGGING Page 24 Figure 19 BLUETOOTH Page 25 Figure 20 Typical Bluetooth Pairing Sequence 26 Figure 21 EXTERNAL SET UP Page 27 Figure 22 CLOCK Page 28 Figure 23 HMI Page 29 Figure 24 INFO Page 30 Figure 25 CHART Page 30 Figure 26 LOG FILES Page 31 Figure 27 LOGS Page 31 Figure 28 CALIBRATION Page 32 Figure 29 Easi Fit Sample Kit MDM300 Panel Mount Sampling System 34 Figure 30 Large a...

Page 7: ...er battery charger unit other than that supplied with the instrument should be used NOTE Do 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 SWP for this instrument is 350 barg 5076 psig Toxic Materials The use of hazardous materials in the construction of this...

Page 8: ...er s mA milliampere Mb megabytes max maximum min minute s mm millimeter s MPa megapascal No number PIN personal identification number ppmV parts per million by volume ppmW parts per million by weight psig pounds per square inch scfh standard cubic feet per hour SWP safe working pressure sec second s V volts Warnings The following general warning listed below is applicable to this instrument It is ...

Page 9: ...mber of different external transmitter inputs Pressure range 0 350 barg 0 5076 psig Temperature range 100 100 C 148 212 F Dew point Easidew transmitter range 100 20 C 148 68 F A graphical display presents the dew point data in large format characters and simultaneously provides a primary display of real time dew point readings and a secondary display in smaller characters for the external sensor i...

Page 10: ... available an MDM300 standard version and an MDM300 intrinsically safe version This manual covers the MDM300 version only For information about the MDM300 I S contact your local Michell Instruments representative contact information at www michell com Figure 1 MDM300 Advanced Dew Point Hygrometer ...

Page 11: ...el of the instrument Connections to the MDM300 dew point hygrometer comprising the gas ports battery charger input connector and input connector for the external sensor are all made to the top panel Figure 2 shows the layout of these controls and Table 1 describes their respective operational functions Fig 2 1_V6 2 1 3 4 5 6 7 Figure 2 User Connections Controls and Indicators ...

Page 12: ... does not need be switched ON in order to charge the internal NiMH battery 4 Top Gas Output port Refer to Section 2 5 5 Top Gas Input port Refer to Section 2 5 6 Top Analog input connector for external sensor pressure temperature or dew point By default this signal is displayed in the secondary display area but may be configured to be displayed as the primary display Spans for each signal input ar...

Page 13: ... alpha numeric values these keys are used to change the values Pressing the key once increases or decreases the selected field by one step Pressing and holding the key will cause the selected field to be continuously increased or decreased until the key is released 1 2 3 Right Key Within sub menu levels requiring the entry of alpha numeric values this key is used to shift the insertion point right...

Page 14: ...arning beep sounds when the battery charge level is critical followed immediately by Shutdown Mode NOTE The icon becomes animated when the charger is connected 3 Keyboard beep indicator Indicates that the keyboard beep is switched on 4 Keyboard lock indicator Indicates that the keyboard is locked 5 Datalog status indicator Indicates that logging is enabled and running 6 Sensor initializing indicat...

Page 15: ...The instrument can display the measured reading in the following units Absolute Humidity g m3 Moisture Content ppmV ppmW AIR USER SF6 CO2 or N2 Dew point C F K Relative Humidity Mixing Ratio g kg AIR USER SF6 CO2 or N2 To toggle between displayed units press either the or key ...

Page 16: ...y Once the message has disappeared this indicates that the instrument has finished its accelerated approach to the actual dew point Depending on the conditions it may continue to respond for a number of minutes more before settling on or tracking the actual measured dew point Other Status Display Indications Internal sensor error Dew point reading out of range 30 120 C Internal thermistor error Se...

Page 17: ...The MDM300 instrument is packed into a standard box and the method of unpacking is shown below 1 2 3 Figure 4 Packing Method 1 Open the box 1 and unpack carefully 2 Remove the MDM300 2 and the accessories box 3 3 Save all the packing materials for the purpose of returning the instrument for re calibration or any warranty claims 4 If the optional carry bag has been ordered it will be located undern...

Page 18: ...nstrument see Figure 5 5 Quick start card 6 Carrying case optional Three gas port adaptors are provided two with a large bore orifice and one with a small bore orifice Depending upon configuration this permits the instrument to be run at either system pressure or atmospheric pressure and facilitates the connection of external flow monitoring and control NOTE On delivery the two large orifice adapt...

Page 19: ...MDM300 User Manual Michell Instruments 11 INSTALLATION 1 4 3 6 5 2 Figure 6 Accessories ...

Page 20: ...are made via the Gas In 2 and Gas Out 1 ports located on the rear of the instrument as shown in Figure 5 The MDM300 is supplied with a large bore orifice fitting installed into the Gas In and Gas Out ports These fittings have an 1 8 NPT female thread to allow the user to connect other components of their choice Atmospheric pressure or system pressure dew point can be measured depending on the conf...

Page 21: ...re bonded seals are correctly seated in recessed grooves I S PTFE tape here 1 8 Swagelok fitting Adaptor Bonded seal Figure 7 Bonded Seal Fitting 2 Fit any other adaptors that might be required 3 If the small bore orifice fitting is not being utilized then one of the optional application kits could be fitted as shown below Figure 8 Gas Coupling Examples for Atmospheric Pressure Measurement NOTE Th...

Page 22: ... be defined Switch on the instrument and initially set the required pressure units from the Settings Menu refer to Section 3 4 1 Using the EXTERNAL option from the SET UP Menu set up the instrument for an external 4 20 mA pressure transmitter input as follows Refer to Section 3 4 4 EXTERNAL TYPE Select PRESS EXTERNAL ZERO Enter Zero point pressure represented by 4 mA input EXTERNAL SPAN Enter Span...

Page 23: ...s shown below Dewpoint External C 12 7 6 9 C Temp Figure 11 Typical External Temperature Display The measured temperature will be used to calculate Relative Humidity 2 6 3 Set Up External Dp Easidew Transmitter Parameters After adding an external dew point transmitter the following parameters must be defined Switch on the instrument and initially set the required DP TEMP units to either C F or K f...

Page 24: ...Use the and keys to select either ATM for atmospheric pressure or the required pressure NOTE The pressure units are selected in the Settings Menu 2 6 5 Connecting your own Temperature or Pressure Transmitter To connect your own 4 20mA temperature transmitter or pressure transmitter the connector P N MDM 27767 is required Wiring is shown below in figure 13 If connecting an external temperature tran...

Page 25: ... battery will typically provide up to 48 hours of continuous operation when fully charged A graphical display of battery charge state is provided and an audible warning is given as the battery approaches full discharge 1 2 Figure 14 Battery Charger Connection Connect an AC power supply 90 264 V AC 50 60 Hz to the battery charger unit NOTE The MDM300 instrument does not need to be switched on in or...

Page 26: ...ll Instruments service department for advice Once the charger has finished the fast charge stage it can be safely disconnected Switch off the AC power supply remove the charger unit and close the instrument s charge connector protection cover A complete charge cycle will take 2 to 4 hours for a fully discharged battery The table below shows the different charging stages and durations Stage Charger...

Page 27: ...or bystander is possible 3 1 Preparation for Operation Before operation it is recommended that the user becomes familiar with Section 1 of this manual in which the equipment controls and indicators and the elements of the display are described Prior to making a measurement the instrument must have been connected to a sample gas stream see Section 2 5 It is recommended that the battery is charged b...

Page 28: ...secondary display area The initializing icon item 6 in Figure 3 is displayed in the status area and the keyboard is locked out until the initialization period has expired It is possible to terminate the initialization process before the initialization period has timed out by pressing the and keys simultaneously This action aborts the instrument s response enhancement system and allows the operator...

Page 29: ...ble SETTINGS LOGGING BLUETOOTH EXTERNAL CLOCK HMI CALIBRATION and INFO For more detailed information on these options refer to Section 3 4 These options are selected by means of the and keys Pressing the Enter key then provides access to a sub menu which permits the variables associated with that option to be edited as follows 1 Press the and keys to highlight the required field 2 Press the Enter ...

Page 30: ...PE EXTERNAL ZERO EXTERNAL SPAN USER PRESSURE YEAR MONTH DAY HOUR MIN CONTRAST BRIGHTNESS KEY TONE BL TIMEOUT LANGUAGE PRIMARY DISP MDM300 CAL CORREC CAL CORRECTION TABLE 100 to 60 CAL CORRECTION TABLE 50 to 10 CAL CORRECTION TABLE 0 to 20 EASIDEW CAL PAGE EASIDEW OFFSET ADJ EASIDEW 1 POINT ADJ INFO PAGE LOGGING BLUETOOTH EXTERNAL CLOCK HMI CALIBRATION INFO Chart page only if internal sensor availa...

Page 31: ...re 17 SETTINGS Page Parameter Description PRIMARY DP AT Indicates if the primary display sensor is at atmospheric or system pressure Available Input ATMOS or PRESS Atmospheric or Pressure DP TEMP UNIT Sets system temperature units Available Input C K F PRESSURE UNIT Sets system pressure units Available Input psig MPa psia bara KPa barg GAS TYPE Defines the sample gas type NOTE The MOL WEIGHT field...

Page 32: ...will change the numbers to letters or vice versa PARAMETER Sets parameter to be logged This need not necessarily be the same as that displayed on the Main Display NOTE Only one parameter may be logged at one time Available Input DEWP GM3 GKG RH PPMW PPMV CALC DP LOG INTERVAL Sets log interval in 5 sec increments Available Input Range 5 to 600 seconds START Starts the log cycle after logging parame...

Page 33: ...ed Michell application software package is used to upload the files to the PC s desktop from where they can be loaded into other programs e g Microsoft Excel for further examination and processing ENABLE NO NAME MDM300 BLUETOOTH ENABLE NO NAME MDM300 BLUETOOTH ENABLE YES NAME in Bluetooth mode MDM300 BLUETOOTH Figure 19 BLUETOOTH Page Parameter Description ENABLE Turns the Bluetooth facility on or...

Page 34: ...s as follows 1 From the PC s Bluetooth menu search for devices in range This yields the instrument named i e MDM300 2 Double click the instrument icon and enter the instrument s pairing passcode 7316 for all MDM300 instruments NOTE Each digit will be shown only briefly as it is entered and then hidden 3 When all digits have been entered click Next 4 With the serial link established click Configure...

Page 35: ...AL Figure 21 EXTERNAL SET UP Page Parameter Description EXTERNAL TYPE Defines the type of connected external transmitter Available Input NONE EASIDEW TEMP PRESS EXTERNAL ZERO Defines external zero lower limit Available Input Range Depends on transmitter type EXTERNAL SPAN Defines external span upper limit Available Input Range Depends on transmitter type USER PRESSURE Used to define system pressur...

Page 36: ... 03 DAY 26 HOUR 10 MIN 32 YEAR 11 CLOCK MONTH 03 DAY 26 HOUR 10 MIN 32 Figure 22 CLOCK Page Parameter Description YEAR Current year Available Input Range 00 to 99 MONTH Current month Available Input Range 01 to 12 DAY Current day Available Input Range 01 to 31 HOUR Current hour Available Input Range 00 to 23 MIN Current minute Available Input Range 00 to 59 Table 8 CLOCK Parameters ...

Page 37: ...ght control Available Input OFF 15 to 60 sec in 15 sec increments LANGUAGE Sets the language required Available Input ENG DEU ESP FRA ITA POR PRIMARY DISP Sets the display option NOTE This option is only accessible if an external sensor has been configured see below Available Input INTERN EXTERN Table 9 HMI Parameters If no external input is selected the internal sensor temperature is shown on the...

Page 38: ...parameters a graphical display of the output can be obtained by pressing the key from the Main Display The chart can be reset at any time by pressing the Enter key Reset the chart by pressing the key or return to the chart without resetting by pressing the key A typical chart plot is shown below t 5 t Minutes Val 55 6 Min 55 3 Max 68 7 RH 70 50 Figure 25 CHART Page The X axis time has a default ra...

Page 39: ...PC In the FILES Page a shortcut to the LOGGING Set Up Menu is provided by pressing the Enter key Refer to Section 3 4 2 for logging set up details 3 4 10 LOGS Page If the instrument is logging pressing the key while the chart is displayed will show the LOGS Page The page shows the current log file In the LOGS Page a shortcut to the LOGGING Set Up Menu is provided by pressing the Enter key Refer to...

Page 40: ...format NOTE The chart and datalogging are independent functions therefore the parameter displayed on the chart may not necessarily reflect what is being logged 3 4 11 CALIBRATION Select calibration MDM300 Calibration Correction Easidew Offset Adjustment Easidew One Point Adjustment Figure 28 CALIBRATION Page Entry to the CALIBRATION Menu is protected by a passcode 4876 The passcode is entered in a...

Page 41: ...igure 17 FILE NAME PARAMETER DEWP LOG INTERVAL 5 sec START STOPPED BLUETOOTH Section 3 4 3 Figure 18 ENABLE NO NAME MDM300 EXTERNAL Section 3 4 4 Figure 20 EXTERNAL TYPE NONE EXTERNAL ZERO N A EXTERNAL SPAN N A CLOCK Section 3 4 5 Figure 21 Current UK time date HMI Section 3 4 6 Figure 22 CONTRAST 80 BRIGHTNESS 40 KEYTONE OFF BL TIME OUT 15 sec LANGUAGE ENG PRIMARY DISP INTERN CALIBRATION INFO Sec...

Page 42: ...plied otherwise physical injury to the operator or bystander is possible For the most basic measurement it is recommended to have a flow meter 0 1 l min and at least one metering valve A number of sampling kits are available from Michell Instruments The Easi fit sample kit is a low cost sampling system consisting of 2 metering valves and a flow meter which is suitable for many applications The MDM...

Page 43: ...nt Figure 30 Large and Small Orifice Fitting With one metering valve Ensure that large orifice fittings are fitted to both the inlet and the outlet of the instrument To measure at atmospheric pressure the metering valve used to control the sample flow should be fitted to the inlet of the instrument To measure at system pressure the metering valve used to control the sample flow should be fitted to...

Page 44: ...gas stream 2 Adjust the flow rate using the inlet flow control valve to between 0 2 and 1 2 Nl min 0 5 2 5 scfh The outlet flow control valve should be fully open 3 Turn the instrument on the initialization period begins automatically The page will show a countdown of the remaining initialization time The status display will read Initializing internal sensor 4 After Initialization the instrument w...

Page 45: ...ured dew point C Enhanced Purge 1 Connect the MDM300 to the sample gas stream 2 Adjust the flow rate using the inlet flow control valve to between 0 2 and 1 2 Nl min 0 5 2 5 scfh The outlet flow control valve should be fully open 3 Turn the instrument on the initialization period begins automatically The page will show a countdown of the remaining initialization time The status display will read I...

Page 46: ...omplete discharge Complete discharge may occur if the unit is not connected to a battery charger within a 48 hour period see below WARNING If complete discharge does occur then difficulties may be encountered when attempting to recharge the battery If this problem is experienced refer below for a possible solution 3 7 1 Battery Troubleshooting Problem Instrument battery is flat and will not charge...

Page 47: ...in 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 line fro...

Page 48: ... 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 process ...

Page 49: ...gth 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 become more a...

Page 50: ...an the sample can flow from the exhaust back into the system A longer exhaust sometimes called a pigtail can also help alleviate this problem Slow the response of the sensor to changes in moisture content An excessively high flow rate can Introduce back pressure causing slower response times and unpredictable effects on equipment such as humidity generators Result in a reduction in heating capabil...

Page 51: ...ing with the application software see Section 3 4 3 for details The application software allows modification of all the instrument parameters from the connected PC The settings currently stored on the MDM300 can be downloaded to the PC by clicking the Download from MDM300 button and can then be changed and stored by clicking the Upload to MDM300 button The software gives access to all logging file...

Page 52: ... in an accredited e g UKAS or NIST U S standards laboratory If these facilities do not exist it is recommended that the instrument be returned to the manufacturer Michell Instruments Ltd or one of the approved agents A calibration certificate bearing a seven point calibration is issued with each instrument Figure 31 shows a typical seven point calibration certificate Figure 33 Typical 7 point Cali...

Page 53: ... are made from stainless steel and are of suitable quality 5 Connect the MDM300 to a dew point generator and establish a gas flow through the instrument 6 Apply a dew point of 100 C and allow the instrument s reading to stabilize for a minimum of 96 hours including dry down 7 Record the applied REF dew point and the corresponding MDM300 display reading 8 Repeat steps 6 and 7 at all the required de...

Page 54: ...column POINT represent the thirteen nominal calibration points spread at 10 C intervals over the instruments operating range of 100 20 C 148 68 F These points cannot be edited The second column REF represents the value of the reference dew point standard applied at that particular point The third column MDM300 represents the reading that the MDM300 was showing at the corresponding REF level input ...

Page 55: ...dp Easidew 7 3 C dp Offset 1 3 C dp Press to confirm or press to exit MDM300 6 6 C dp Easidew 7 3 C dp Offset 1 3 C dp Offset value saved press to exit MDM300 6 6 C dp Easidew 6 6 C dp Offset 0 0 C dp 1 Set up the MDM300 and the external Easidew transmitter to monitor the same sample gas stream 2 From the CALIBRATION Menu select Easidew Offset Adjustment and press the Enter key 3 The offset adjust...

Page 56: ...firm or press to exit MDM300 20 6 C dp Easidew 21 7 C dp Offset 1 1 C dp Offset value saved press to exit MDM300 20 6 C dp Easidew 20 6 C dp Offset 0 0 C dp 1 Set up the MDM300 and the external Easidew transmitter to monitor the same sample gas stream and connect to a dew point generator 2 Apply a dew point reference to the MDM300 and external transmitter at the required dew point 20 6 C in this e...

Page 57: ...ors connected to it 2 If fitted remove the instrument from its carrying case 3 Pack the instrument in its original carton 1 as shown below NOTE It is not necessary to return any accessories unless they require repair replacement Any returned accessories can be packed in the box 3 4 Create a packing list detailing all equipment contained in the box place it inside the box and seal the box Before di...

Page 58: ...MDM300 User Manual 50 97122 Issue 16 2 June 2022 APPENDIX A Appendix A Technical Specifications ...

Page 59: ...nputs 4 20 mA external input selectable as either dew point temperature or pressure Battery Operating Life Up to 48 hours of typical usage between charges Battery Charger Intelligent charger supplied Operating Conditions Operating Pressure 35 MPa 350 barg 5076 psig max Operating Environment Outdoors 0 100 rh condensing Operating Temperature 20 50 C 4 122 F Storage Transport Temperature 20 50 C 4 1...

Page 60: ...MDM300 User Manual 52 97122 Issue 16 2 June 2022 APPENDIX A A 1 Dimensions 218mm 8 56 90mm 3 54 170mm 6 69 Figure 39 Dimensions ...

Page 61: ...MDM300 User Manual Michell Instruments 53 APPENDIX B Appendix B Datalog Status Display ...

Page 62: ...Bit 1 is the least significant bit The four most significant bits 13 16 are for Michell Instruments service use and so the first character in any MDM300 ST display will always read 0 Status register bit position 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 N A N A N A N A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 N A Figure 41 MDM300 Status Register For the example given for each of the log plots show...

Page 63: ... 0x0020 BIT 6 Measurement in progress Internal dew point not stable 0x0040 BIT 7 Internal dew point changing 0 2 Cdp over a 3 minute interval 0x0080 BIT 8 Log finished Log file has reached the maximum of 10 000 logs and logging has been stopped 0x0100 BIT 9 Internal sensor not found Could not detect internal sensor on power up 0x0200 BIT 10 Default CONFIG file used Config file missing new file cre...

Page 64: ...MDM300 User Manual 56 97122 Issue 16 2 June 2022 APPENDIX C Appendix C FCC Declaration ...

Page 65: ...oduct does cause harmful interference to radio reception which may be determined by turning the product on off the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the product and receiver Connect the equipment into an outlet on a circuit different from that to which the receive...

Page 66: ...MDM300 User Manual 58 97122 Issue 16 2 June 2022 APPENDIX D Appendix D Quality Recycling Warranty Information ...

Page 67: ...mation 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...

Page 68: ...MDM300 User Manual 60 97122 Issue 16 2 June 2022 APPENDIX E Appendix E Return Document Decontamination Declaration ...

Page 69: ...ES 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 ha...

Page 70: ...http www michell com www ProcessSensing com ...

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