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7.6 Status Output Summary Table
Table 7-2 below is a logic truth table summarizing the recommended actions based on the
states of the four status outputs. A ‘1’ indicates the output is ON, a ‘0’ indicates the
output is OFF, and ‘X’ indicates the output is in either state.
Table 7-2: Status Output Truth Table
Sensor
OK
Invalid
Reading
Lamp
Low
Cell
Dirty
Actions
1 0 0 0 Normal operation, no action
required
0 X X X Service required
1 1 X X Check Pressure > 45 psia
Verify that concentration has
not exceeded full scale range
of sensor.
Calibrate at Zero.
1 X 1 X Lamp adjustment useful,
though not required
1 X X 1 Calibrate at zero
Clean Cell
P/N 03662D Teledyne API Model 460H O
3
Monitor Operator Manual - Page 36