Teledyne API Model 300M CO Analyzer Instruction Manual, 04033, Rev. A
Table 5-2: I/O Signals (Continued)
# Signal Control Description
19 ST_HIGH_RANGE YES Status Bit - Autorange High Range
Logic High = M300M in high range
Logic Low = M300M in low range
20 ST_SYSTEM_OK YES Status Bit - System OK
Logic High = No instrument warning present
Logic Low = 1 or more alarm present
21 ST_BENCH_ALARM YES Status Bit - Bench Temperature Alarm
Logic High = Bench Temp out of spec
Logic Low = Bench Temp in spec
22 ST_SOURCE_ALAR
M
YES Status Bit - IR Source Alarm
Logic High = IR Source output too low
Logic Low = IR Source output normal
23 ST_WHEEL_ALARM YES Status Bit - Wheel Temperature Alarm
Logic High = Wheel Temp out of spec
Logic Low = Wheel Temp in spec
24 CO_MEASURE NO IR detector reading during measure phase. Typically
2500 - 4500 mV.
25 CO_REFERENCE NO IR detector reading during reference phase. Typically
2500 - 4500 mV.
26 SAMPLE_PRESURE NO Sample pressure in mV. Typical sea level value =
4300 mV for 29.9" HG-A.
27 VACUUM_PRESSUR
E
NO Sample flow in mV
28 SAMPLE_TEMP NO Sample temp in mV
29 BENCH_TEMP NO
Optical Bench temp. typically 2270 mV for 48°C
30 WHEEL_TEMP NO
Filter Wheel temp. typically 4770 mV for 68°C
31 BOX_TEMP NO Internal analyzer temp. in mV
(table continued)
5-5
