Michell Instruments Liquidew EExd, User Manual

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Liquidew EExd User’s Manual
Michell Instruments 35
APPENDIX A
Appendix A Technical Specification
Main Unit – Measurement Parameters
Channel Configuration Single and dual channel
Moisture Content ppm
W
Temperature °C and °F
Water Dew Point °C and °F
Sample Flow Rate
Status indication: LOW/OK/HIGH
<0.1 to >0.3 l/min (<0.03 to >0.08 GPM)
Sensor Technology
Moisture Sensor
Technology
Michell Ceramic Moisture Sensor
Calibration Range -100 to +20°Cdp ( -148 to +68°Fdp)
Measurement Range -120 to +30°C (-184 to +86°F) (0.001 ppm
W
to saturation)
Accuracy
Dew point:
Moisture content:
Analysis temperature:
±1°C between –59.9 & +20°Cdp
(±1.8°F between -75.9 to +68°Fdp)
±2°C between –60 & -100°Cdp
(±3.6°F between -76 to -148°Fdp)
±10% of reading
±20% of reading
Accuracy ±0.2°C
Resolution
0.1°C b20 & -80°Cdp (0.2°F b68 & -112°Fdp)
1°C between -80 & -100°Cdp (2°F between -112 & -148°Fdp)
Temperature Coefficient Algorithm compensation
Operating Pressure Max. 80 barg (1160 psig)
Sample Flow
Up to 1 Nl/min (0.1 to 0.2 Nl/min recommended)
(Up to 0.26 GPM (0.03 to 0.05 GPM recommended))
HMI
Keypad/Interface Capacitive touch-screen through glass
Display Vacuum fluorescent
Datalogging
A rolling maximum of 150 data logs is available
Each log records time, date, moisture and temperature values for
each channel
5 minutes minimum and 60 minutes maximum logging intervals can
be set by the user
Communications and
Output
Two non-isolated 4-20 mA per measurement channel
500 Ω maximum load
Range and parameter settable by user
Modbus RTU @ 9600 baud-rate
Alarms: two volt free contacts per channel; one process value and
one instrument status
Also available via Modbus communications
Enclosure
Type Flameproof EExd
Construction Cast copper-free aluminum
Finish
Chromate primer, Polyester P9010 powder coated (black) - meets
BS3900