Michell Instruments QMA401, User Manual

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QMA401 User’s Manual
Michell Instruments 79
APPENDIX C
Register Configuration M — System Warning Flags (Register 230), Analyzer Status
Alarm Relay Selection Mask (Register 9)
1=Warning or fault, 0=OK
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Bit HEX Warning Condition
0 0001
Oven temperature unstable. Oven temperature has not been
stable within ±0.01C of setpoint for continuous 5 minutes. (Process
alarms de-energized, both analog outputs at fault condition
1 0002
Enclosure temperature too high. Enclosure (System) temperature
too high. (> Oven temperature setpoint -2°C)
2 0004
Flow control error. MFC Flow control error (by >5ml/m of fl ow
target)
3 0008 Cell pressure sensor error. (under 4 mA, over 20 mA or no signal)
4 0010 Ext Press sensor error. (under 4 mA, over 20 mA or no signal)
5 0020
Field cal error. Internal moist generator drift, instrument excessive
drift or desiccant dryer deterioration requiring very large corr. factor
(<0.2500 or >4.000). In this case the correction factor would be set
to 1.0. (Checked after fi eld calibration)
6 0040
Beat freq. out of range. Beat frequency Under/Over acceptable
range (<1500 Hz, >20000 Hz)
7 0080 ppmV over range. ppm
V
over instrument range (>2000ppm
V
)
8 0100
Oven temperature sensor fault. Oven temperature sensor fault
(Process Alarms de-energized, Fault Alarm Active, both Analog
outputs at fault condition (ADC <10, >4000 counts)
9 0200 mA output 1 error. (o/c or high resistance at output)
10 0400 mA output 2 error. (o/c or high resistance at output)
11 0800
Oscillator board comms error. Oscillator board comms. error or
board not present (checked on startup)
12 1000
Ethernet board comms. error. Ethernet Board comms. error or
board not fi tted (checked on startup)
13 2000
Dryer due for service. Desiccant Dryer due for service or
replacement (>5000000ppm
V
)
14 4000
Moisture generator due for service. Internal Moisture Generator
due for service or replacement (>1030days)
15 8000
Calibration Alarm
In calibration mode or data held (or both)
Analyzer Status Alarm selection mask (in Register 9) allows user to set which condition(s) trigger
status relay alarm 4.