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QMA401 User’s Manual

97450 Issue 2, March 2018

INTRODUCTION

1.2

Theory of Operation

The Quartz Crystal Microbalance (QCM) technology for moisture measurement is

based on monitoring the frequency of a hygroscopic-coated quartz crystal with specific

sensitivity to water vapor.

Bulk adsorption of water vapor onto the coated crystal causes an increase in the crystals

effective mass, modifying its oscillation frequency in a very precise and repeatable

manner. The frequency change is in proportion to the water vapor pressure in the

sample gas, providing a direct measurement of moisture content.

The sorption process is fully reversible with no long-term drift effect, giving a highly

reliable and repeatable measurement.

1.3

Sample Gas Path

The QMA401 measurement system must be supplied with gas at the required pressure

(to match that of its calibration) via the VCR connection on the rear of the instrument.

The flow is controlled automatically.

The sensor cell is located at the end of the sensor block and contains the sensor and

reference oscillators.

Figure 1 shows a schematic diagram of this sampling system:

Sample In

Sample Out

HE1

HE2

MFC

QCH

FC1

FC2

FC3

Key

Desiccant column

Moisture generator

MFC

Mass flow controller

V1, V2, V3

Solenoid Valves

QCH

Sensor cell

HE1/HE2

Heat exchanger

Pressure sensor

FC1

Flow control

Figure 1

Measurement System

Содержание QMA401

Страница 1: ...QMA401 Trace Moisture Analyzer User s Manual 97450 Issue 2 March 2018...

Страница 2: ...information when contacting Michell Instruments for service purposes Analyzer Code Serial Number Invoice Date Location of Instrument Tag No Analyzer Code Serial Number Invoice Date Location of Instru...

Страница 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...

Страница 4: ...in Screen 16 3 5 1 Large Display Mode 18 3 5 2 Full Screen Graph 18 3 6 Main Screen Sub Menus 19 3 6 1 Warning Screen 19 3 6 2 Logging Screen 20 3 6 3 Alarm Screen 21 3 6 4 Field Calibration Screen 22...

Страница 5: ...tions Window 56 6 6 Data Logging 57 6 6 1 Configuring Logging Start Time 58 6 6 2 Configuring Logging Stop Time 58 6 6 3 Starting the Log 58 6 6 4 Viewing a Log 58 6 7 Parameters Field Calibration 58...

Страница 6: ...24 Figure 20 Field Calibration Screen 4 25 Figure 21 Field Calibration Screen 5 25 Figure 22 Monitor Screen 26 Figure 23 Settings Menu Screen 27 Figure 24 Measurement Screen 28 Figure 25 Carrier Gas...

Страница 7: ...2 Appendix B Calculating Conversion Factors for Gas Mixes 64 Appendix C Modbus Holding Register Map 66 C 1 Set Points and Ranges 83 C 2 Gases for Gas Correction Values 84 Appendix D Quality Recycling...

Страница 8: ...eas where potentially hazardous operations need to be carried out and where particular attention to personal and personnel safety must be observed DANGER Electric Shock Risk Where this symbol appears...

Страница 9: ...ound 3 years Desiccant column typical lifetime of around 2 years but this strongly depends on the moisture content of the sample gas The drier the sample gas the longer the lifetime of the desiccant M...

Страница 10: ...otocol ml min milliliters per minute mg m3 milligrams per cubic meter lbs MMscf pounds per million standard cubic feet mA milliampere mins minutes mmHg millimeter of mercury Pa pascal ppmV parts per m...

Страница 11: ...cated and require experience and special care in use increasing cost of ownership The QMA401 differs through its very uncomplicated approach to field service the desiccant column is easy to replace vi...

Страница 12: ...tent The sorption process is fully reversible with no long term drift effect giving a highly reliable and repeatable measurement 1 3 Sample Gas Path The QMA401 measurement system must be supplied with...

Страница 13: ...rnal particulate filter Pressure regulator Fast loop bypass with flow control DRYER OVEN GAS IN GAS OUT FILTER S0 No sample system With 15 m internal filtration DRYER OVEN GAS IN GAS OUT FILTER P R E...

Страница 14: ...flow control With 15 m internal filtration DRYER OVEN GAS IN GAS OUT P R E S S U R E R E G U L A T O R S4 Input pressure regulator External 15 m filter supplied DRYER OVEN GAS IN GAS OUT P R E S S U...

Страница 15: ...1 User s Manual Michell Instruments 5 INTRODUCTION DRYER OVEN GAS IN GAS OUT M E T E R I N G V A L V E S6 Fast loop bypass with flow control External 15 m filter supplied Figure 2 Internal Sampling Op...

Страница 16: ...late Any documentation supplied with the product should be removed from the packaging crate and stored elsewhere to protect its integrity For the period from installation of the product to commissioni...

Страница 17: ...e following electrical supply 85 to 264 V AC 47 63Hz 250 VA max Alarm outputs comprise four sets of changeover relay contacts one set for INTERNAL FAULTS and three sets for PROCESS alarms All contacts...

Страница 18: ...3 4 5 6 7 8 9 1 Power Connection IEC Power Socket On Off Switch Fuse 2 Electrical Connections 1 USB RS485 Modbus A B G Alarms 1 2 NC1 NO1 COM1 NC2 NO2 COM2 Alarms 3 4 NC3 NO3 COM3 NC4 Analyzer Status...

Страница 19: ...ified on the calibration certificate typically a sample pressure of 1 barg 14 5 psig with the outlet at atmospheric pressure When using the pressure control option the cell pressure should never excee...

Страница 20: ...o the correct length and if necessary bend to shape to suit the location of the instrument NOTE To facilitate ease of connection to the adaptor 5 at least 75mm 3 in of the tubing coming out of the ada...

Страница 21: ...ing nut 7 If a stream of bubbles is produced then the gasket seal is leaking If no bubbles are produced the seal is gas tight If a leak is detected tighten up the locking nut 7 a little more until the...

Страница 22: ...Section 2 and connected to a sample gas supply that is representative of the monitored process 3 1 General Operational Information Operation of the QMA401 Trace Moisture Analyzer is completely automat...

Страница 23: ...stainless steel body and diaphragm to minimize impact on sample response speed when measuring dry samples To set the input pressure 1 Power the analyzer on and wait for the oven to heat up before proc...

Страница 24: ...rsion factor needs to be calculated according to the instructions in Appendix B Temperature and pressure units Pressure input Alarm configuration Analog output configuration Field calibration paramete...

Страница 25: ...MOIST GEN SERVICE WARNINGS LOGGING LOG INTERVAL INTERVAL UNITS START STOP CALIBRATE CAL SOURCE FIELD CAL MONITOR SETTINGS MODBUS ID PROTOCOL FIRMWARE VER SERIAL NUMBERS LANGUAGE CHART PERIOD HOUR MINU...

Страница 26: ...ater Vapor Pressure Pa Water vapor pressure in pascals lbs MMscf Pounds H2 O per million standard cubic feet Frost Point Frost point temperature of either ideal or natural gas depending on options set...

Страница 27: ...ted for warning fault Selection set in Modbus Register 9 see appendix D Warnings Internal warning alarms Possible alarm states OK WARNING Graph Delta Shown as X where X the currently selected primary...

Страница 28: ...ment parameter to be enlarged To return to the Main Screen touch anywhere on the screen Figure 11 Large Display Mode 3 5 2 Full Screen Graph Displays a full screen graph of Parameter 1 To access the f...

Страница 29: ...rning Screen The buttons on this screen are used to toggle the internal alarms on off When an individual alarm is disabled it will not trigger the internal alarm Figure 13 Status Screen Displays the s...

Страница 30: ...nds Status Displays status information related to logging e g SD card full Filename Automatically generated filename based on current time and date The SD card should be formatted as FAT32 1 H20 mg m3...

Страница 31: ...meter Selects the parameter for the corresponding alarm Available Options Moisture Content ppmV Moisture Content ppmW Moisture Content mg m3 Water Vapor Pressure Pa Moisture Content lbs MMscf Frost Po...

Страница 32: ...ected the user can select how many cycles after the calibration the last measured value is held for Cal Source Toggles between an external calibration source or the internal calibration source If an e...

Страница 33: ...icCalMethod if this is chosen then the following parameters will need to be set and will be displayed on the screen Calibration will begin on the time selected using the interval and hour settings Int...

Страница 34: ...user must enter the external reference moisture in the Ext Ref ppm setting If an internal calibration source is selected then the Ext Ref selection box is hidden as shown above If an external calibrat...

Страница 35: ...e user selects how often in days a calibration is performed Hour of Day This is where the user selects the hour within the day at which the calibration will occur Cal Cycles This is where the user sel...

Страница 36: ...Temperature 0C Live system temperature Flow Rate ml min Live flow rate reading in ml min Cell pressure barg Live internal pressure transducer reading Ext pressure barg Live process pressure reading R...

Страница 37: ...Manual Michell Instruments 27 OPERATION 3 7 Settings Menu Figure 23 Settings Menu Screen Allows access to the following sub menus to change instrument settings Measurement Outputs HMI RTC SW Comms Cal...

Страница 38: ...Appendix B for more information DP Calculation Sets the frost point calculation method Available Options ISO ISO 18453 Ideal Gas IGT IGT Bulletin 8 Pressure Input Selects the pressure source Available...

Страница 39: ...er Gas Screen There are 20 different preset gases the user can choose from along with 3 user definable presets Air Argon Methane Acetylene Ethylene Ethane Propane Butane Propene Carbon Monoxide Carbon...

Страница 40: ...in 8 ISO as per ISO18453 Ideal Gas 3 7 1 3 Purge The purge feature will allow the user to purge the sensor crystals with high flow dry gas quickly this is a flush through cleaning process for the inte...

Страница 41: ...3 7 2 Pressure Input Selects the pressure source Options are Atmos Fixed External If the external option is selected the Fixed selection box is hidden and replaced with the Ext 4mA and Ext 20mA selec...

Страница 42: ...ed Ext 4mA and Ext 20mA selection boxes are all hidden as shown below Figure 29 Atmos Option Fixed Allows the user to enter the fixed pressure using the onscreen keypad Ext 4mA Allows the user to ente...

Страница 43: ...que name for the gas using the onscreen keypad Molecular Weight Allows the user to enter the molecular weight of the gas using the onscreen keypad FCF Allows the user to enter the Flow Correction Fact...

Страница 44: ...Available Options Oven C ml min Cell Pr barg External Pr barg H2 O ppmV H2 O ppmW H2 O mg m3 WVP Pa lbs MMscf DP C Output Type Toggles the signal type of the output Available Options 1 5 V 4 20 mA Min...

Страница 45: ...ons 5 100 Signal Smoothing Select the smoothing signal level Available Options Low medium high Lock Screen Time The user can toggle through the different lock screen timeout options Available Options...

Страница 46: ...en Figure 33 Real Time Clock Screen Parameter Description Day Month Year Sets the current date for the real time clock Hour Minute Sets the current time for the real time clock Save Date Saves the upd...

Страница 47: ...85 USB TCP IP Address This open the Ethernet page where the user can configure the network settings Table 9 Software Communications Screen Parameters 3 7 7 Ethernet Screen Figure 35 Ethernet Screen Pa...

Страница 48: ...s of each previous calibration cycle Apply Applies the SCF from the selected previous calibration cycle 3 7 9 About Screen Control Firmware Oscillator Firmware Display Firmware Analyzer Serial Number...

Страница 49: ...ve of the process being monitored the sample point should be as close to the critical measurement point as possible Also never sample from the bottom of a pipe where entrained liquids may be drawn int...

Страница 50: ...Care should be taken with gas mixtures containing potentially condensable components in addition to water vapor e g oil to ensure that only water vapor is present in the sample Once present on the su...

Страница 51: ...extremely sensitive to moisture fluctuations and ambient temperature variations will affect the equilibrium conditions In a stable environment the water vapor pressure within a closed system is in equ...

Страница 52: ...e frequency difference between the sensor and reference crystals is measured i e dry state The sample and calibration gas paths are shown in green These lines are continually purged during the initial...

Страница 53: ...rement cycle SAMPLE IN SAMPLE OUT DD HE1 HE2 FC1 FC2 FC3 V1 V2 V3 MFC QCH PS MG Key DD Desiccant column MG Moisture generator MFC Mass flow controller V1 V2 V3 Solenoid valves QCH Sensor cell HE1 HE2...

Страница 54: ...pending on what was specified at the time of order The calibration is carried out in a two phase cycle Initially V1 is energized causing the dried sample gas to be routed to the sensor cell for a peri...

Страница 55: ...id valves QCH Sensor cell HE1 HE2 Heat exchanger PS Pressure sensor FC1 FC2 FC3 Flow control Figure 41 Calibration Cycle Phase 2 Sample Flow The analyzer will run though a number of settling cycles to...

Страница 56: ...fault does occur with the system that is not covered within this manual please contact Michell Instruments see contact information at www michell com or your local representative Any maintenance of t...

Страница 57: ...rvice technician Please consult your Michell service representative for spare or replacement parts 4 2 Removal and Replacement of the Dryer Module 1 Undo push catch to open dryer access panel 2 Remove...

Страница 58: ...QMA401 User s Manual 48 97450 Issue 2 March 2018 MAINTENANCE 5 Remove dryer module 6 Fit replacement dryer module following these instructions in reverse to re assemble...

Страница 59: ...re not available the analyzer must be returned to the manufacturer Michell Instruments or one of their approved agents A list of worldwide Michell Instruments offices is provided at www michell com Th...

Страница 60: ...QMA401 User s Manual 50 97450 Issue 2 March 2018 CALIBRATION Figure 42 Typical QMA401 Calibration Certificate...

Страница 61: ...P Windows VISTA Windows 7 32 bit or 64 bit Windows 8 32 bit or 64 bit CPU Intel Pentium III 500 MHz recommended Pentium 4 1 6 GHz or Pentium M 1 0 GHz or Athlon 1 2 GHz or higher RAM 512 MB recommende...

Страница 62: ...etween the software and QMA analyzer Choose the Modbus slave address default is 1 and the serial COM port that the instrument is connected to Click the Connect button After a few seconds the software...

Страница 63: ...er open Windows device manager and expand the Ports COM LPT branch The USB to RS232 adapter should be listed in this branch together with the COM port number 6 3 1 2 USB Connection If directly connect...

Страница 64: ...2 seconds The chart update rate is 2 seconds but this may be changed by using the chart options window Data logging does not start automatically this is indicated by the text NOT LOGGING on the Main...

Страница 65: ...L X Allows the user to scroll the X axis left and right SCROLL Y Allows the user to scroll the Y axis up and down SIZE X Allows the user to size the X axis SIZE Y Allows the user to size the Y axis ZO...

Страница 66: ...data series from the chart Tick to show untick to hide Restore on plot mode When ticked selecting plot mode will restore the X and Y axis to the state before they were modified after sizing zooming o...

Страница 67: ...the Auto generate button to generate a filename based on the current date and time An auto generated log file filename has the following format QMA dd mm yy hh mm ss log where dd date mm month yy year...

Страница 68: ...ted date and time is reached or when the STOP button is clicked or the software is shut down 6 6 3 Starting the Log After choosing a filename and configuring logging start and stop times click the STA...

Страница 69: ...A401 User s Manual Michell Instruments 59 APPLICATION SOFTWARE 6 7 1 Field Calibration This window allows manual analyzer calibrations to be performed and settings for automatic calibrations configure...

Страница 70: ...nector and alarm output connectors 3 Isolate the incoming sample line and remove the connections to the GAS IN and GAS OUT ports 4 Re fit the VCR blanking caps supplied to the GAS IN and GAS OUT ports...

Страница 71: ...QMA401 User s Manual Michell Instruments 61 APPENDIX A Appendix A Technical Specifications...

Страница 72: ...ver is greater Electrical Specifications Supply Voltage 85 to 264 V AC 47 63Hz 110 to 300 V DC Max Power Consumption 111W Alarms 1 x System Alarm volt free change over FORM C 3 x process alarms select...

Страница 73: ...QMA401 User s Manual Michell Instruments 63 APPENDIX B Appendix B Calculating Conversion Factors for Gas Mixes...

Страница 74: ...the mix For example if the gas mixture contains 10 N2 C1 1 000 30 Ar C2 1 395 50 CH4 C3 0 7419 10 CO2 C4 0 7186 1 1 1 395 0 8865 0 1 0 3 0 7419 0 5 0 7186 0 1 Cmix Cmix Below are the conversion factor...

Страница 75: ...QMA401 User s Manual Michell Instruments 65 APPENDIX C Appendix C Modbus Register Map...

Страница 76: ...arm Configuration R W E 3 Analogue Output Configuration R W F 4 Internal Logging Configuration R W U 5 MFC Span in mlm Gas Number for flow rate and mol weight correction R W S 6 PID Proportional Value...

Страница 77: ...xternal Pressure ADC Val 4mA R W A1 0 to 4095 55 External Pressure ADC Val 20mA R W A1 0 to 4095 56 RTC Cal Value PPM error R W A1 0 121 57 Analyzer Serial Number HI WORD R W 32 bit Integer HI Word 1...

Страница 78: ...I 0 0001 to 10000 0000 105 Osc Table1 Ref 10 Lo Word R W I 106 Osc Table1 Ref 11 Hi Word R W I 0 0001 to 10000 0000 107 Osc Table1 Ref 11 Lo Word R W I 108 Osc Table1 Ref 12 Hi Word R W I 0 0001 to 1...

Страница 79: ...R W I 152 Osc Table2 Ref 03 Hi Word R W I 0 0001 to 10000 0000 153 Osc Table2 Ref 03 Lo Word R W I 154 Osc Table2 Ref 04 Hi Word R W I 0 0001 to 10000 0000 155 Osc Table2 Ref 04 Lo Word R W I 156 Osc...

Страница 80: ...de for protected registers W A1 NOT USED CURRENTLY 196 RTC Set Hours Mins W H Write to set Time 197 RTC Set Day Month Year W J Write to set Date 198 Instrument Command Register W T 199 200 Control Boa...

Страница 81: ...A1 243 Dryer Capacity Used Moist Gen Capacity Used R V 244 245 Ethernet Settings IP Address Upper Bytes R W Q Volatile Cannot write via Modbus only via display 246 Ethernet Settings IP Address Lower...

Страница 82: ...Lo Word R I For cal use 286 Ppmv Log t7 Hi Word R I For cal use 287 Ppmv Log t7 Lo Word R I For cal use 288 Ppmv Log t8 Hi Word R I For cal use 289 Ppmv Log t8 Lo Word R I For cal use 290 Ppmv Log t9...

Страница 83: ...5 4 3 2 1 0 B1 Signed Short Range 32768 to 32767 B2 Signed Short 10 Range 3276 8 to 3276 7 B3 Signed Short 100 Range 327 68 to 327 67 B4 Signed Short 1000 Range 32 768 to 32 767 B5 Signed Short 10000...

Страница 84: ...1 Fixed pressure User input value 10 External Line pressure Ext sensor Pressure Units PU Number of cal points to use CP 000 Bar G def 001 Bar A 010 Psi G 011 Psi A 100 MPa G 101 mmHg 110 MPa A Minimum...

Страница 85: ...oisture PPMw 0010 Moisture MGM3 0011 Moisture PA wvp 0100 Moisture LBMMSCF 0101 Dew point 0110 Oven temperature def 0111 Flow rate 1000 Cell Pressure 1001 Ext Line Pressure Alarm3 Parameter A3 Alarm L...

Страница 86: ...IEEE 754 single precision floating point format This format is Big Ended which means that the high byte is at a lower address in memory than the Lo byte and is represented as such in the register mem...

Страница 87: ...D 2 0 0000045 sign bit 1 Exponent 18 therefore exponent field 127 18 109 and bits 30 to 23 0110 1101 The mantissa 1 179648 which in binary representation 1001 0110 1111 1110 1011 0101 i e 1x2 18 1x2 2...

Страница 88: ...rnal 1 External 1 CF manually written by user 0 CF generated via calibration Register Configuration L System Status Register 229 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 A4 A4 A3 A3 A2 A2 A1 A1 SS PS DH...

Страница 89: ...00 In this case the correction factor would be set to 1 0 Checked after eld calibration 6 0040 Beat freq out of range Beat frequency Under Over acceptable range 1500 Hz 20000 Hz 7 0080 ppmV over range...

Страница 90: ...H Interval Days ID 0 to 23 1 day to 365 days Register Configuration Q Various Parameters High Byte and Low Byte 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MS MS MS MS MS MS MS MS MS MS MS GN GN GN GN GN MF...

Страница 91: ...phase countdown 51 Set System Mode to Measurement if in Cal mode i e Abort Cal OR Set to Manual Cal if in Auto cal countdown mode 52 Set System Mode to Calibration if manual cal option set OR Start A...

Страница 92: ...ng Configuration Service Interval Days 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 DC DC DC DC DC DC DC DC ML ML ML ML ML ML ML ML Dryer Capacity or Used DC in ppm Moisture Gen Capacity or Used ML in Days 0...

Страница 93: ...0 0 to 60000 0 to 60000 A1 unsigned short Oven T degC 50 0 to 100 0 59 9 to 60 1 500 to 1000 B2 signed short 10 Oven T degF 58 0 to 212 0 139 8 to 140 2 580 to 2120 B2 signed short 10 Flow ml m 0 0 to...

Страница 94: ...isters 38 39 and 40 for the Flow correction and at registers 41 42 and 43 for the molecular weights 0 Air Mixture 12 He Helium 1 Ar Argon 13 Kr Krypton 2 CH4 Methane 14 N2 Nitrogen 3 C2H2 Ethyne 15 Ne...

Страница 95: ...QMA401 User s Manual Michell Instruments 85 APPENDIX D Appendix D Quality Recycling Warranty Information...

Страница 96: ...d 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 Minera...

Страница 97: ...QMA401 User s Manual Michell Instruments 87 APPENDIX E Appendix E Return Document Decontamination Declaration...

Страница 98: ...micals 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...

Страница 99: ......

Страница 100: ...QMA401 User s Manual 90 97450 Issue 2 March 2018 NOTES...

Страница 101: ...QMA401 User s Manual Michell Instruments 91 NOTES...

Страница 102: ...http www michell com...

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