Michell Instruments QMA601, User Manual

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QMA601 User’s Manual
Michell Instruments 71
APPENDIX A
Appendix A Technical Specifi cation
Performance
Measurement technology Fast Response Quartz Crystal Microbalance
Calibrated range* 0.1 to 700 ppm
V
Measurement range 0.1 to 2000 ppm
V
Accuracy
±10% of reading from 1 to 2000 ppm
V
±0.1 ppm
V
between 0.1 & 1 ppm
V
Repeatability
±5% of the reading from 1 to 2000 ppm
V
±0.1 ppm
V
between 0.1 & 1 ppm
V
Limit of Detection 0.1 ppm
V
Available Units
ppm
V
, ppm
W
, mg/Nm
3
, vapor pressure (Pa), dew point (°C/°F), lbs/
MMscf
Response Speed
T63 <2 mins to step change in either direction
T95 <5 mins to step change in either direction
Automatic calibration Internal moisture generator source calibrated traceable to NPL & NIST
Sensitivity
0.01
ppm
V
or 1% of reading, whichever is greater
Electrical Specifications
Supply Voltage
85 to 264 V AC, 47/63Hz or 24 V DC (ATEX / IECEx)
24 V DC only (cCSAus)
Alarms
1 x System Alarm, volt-free change-over (FORM C)
3 x process alarms, selectable for various parameters, volt free
change-over (FORM C)
Analog signals
2 X 4-20mA or 1-5 V (selectable)
Maximum load resistance 500 Ω for 4-20mA and minimum load of 1M
Ω for 1-5 V
Digital communications
RS485 Modbus RTU
Modbus TCP
Data logging
Available on analyzer (Limited number of values) or via Application
Software
Local Interface 7” color LCD with intuitive HMI
Electrical Connections M20 entries for cable glands
Operating Conditions
Inlet Pressure 3 barg (43.5 psig)
Outlet Pressure 2 barg (29 psig)
Sample Flow 300ml/min total flow
Sample Gas Temperature 0 to +100°C (+32 to + 232°F)
Operating Environment
Analyzer only
Analyzer in sampling
System
+5 to +45°C (+41 to +113°F) up to 90%RH
-20 to +55°C (-4 to +131°F) up to 95%RH, (fitted with heater/
thermostat and/or enclosure cooling as appropriate to ma5 to
+45°C internal temperature)