Michell Instruments Liquidew EExd, User Manual

Page: 78 / 90

Liquidew EExd User’s Manual
70 97097 Issue 14.1, November 2019
APPENDIX G
Appendix G Register Number Formats
Register Configuration A
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r r r r r r r r r r r r r r r r
Value



Sign bit = 1 for –ve values (signed int)
7FFF = 327.67
8000 = -327.68
The value in bits (15 to 0) + 1 is divided by 100 to give 0.01 resolution for dew-point
and temperature values.
Register Configuration B
– Sensor Humidity Setting
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w
0x0000 = Dew point in degrees
0x0001 = Moisture in ppm
W
Register Configuration C
– Error Register
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r r r r r r r r r r r r r r r r
Bit HEX Error Condition
0 0001 Channel 1 dew point under range <-120°C (<-184°F)
1 0002 Channel 1 dew point over range >+30°C (>+86°F)
2 0004 Channel 1 temperature out of range >+50 or <0°C (>+122 or <32°F)
3 0008 Channel 1 low flow (<0.1 l/min)
4 0010 Channel 1 high flow (>0.9 l/min)
5 0020 Channel 1 moisture saturation condition (dew point ≥ temperature)
6 0040 Channel 1 calibration table error (checks sensor impedance values are
increasing in the correct direction)
7 0080 Channel 2 dew point under range <-120°C (<-184°F)
8 0100 Channel 2 dew point over range >+30°C (>+86°F)
9 0200 Channel 2 temperature out of range >+50 or <0°C (>+122 or <32°F)
10 0400 Channel 2 low flow (<0.1 l/min)
11 0800 Channel 2 high flow (>0.9 l/min)
12 1000 Channel 2 moisture saturation condition (dew point ≥ temperature)
13 2000 Channel 2 calibration table error (checks sensor impedance values are
increasing in the correct direction)
14 4000 Internal heater fault (internal temperature set-point not achievable)