Table 5-11: User and system alarms break down
Alarm
Range
System status
Definition
Photo diode
temperature
0 to 3
0
1
1
3
0 = Temperature is within operating
conditions.
1 = Too low. Less than –40 °C.
2 = Too high. Over 70 °C.
3 = Sensor fault (No sensor detected or
below -49°C)
Hood
temperature
0 to 3
0
1
1
2
0 = Temperature is within operating
conditions.
1 = Too low. Less than –40 °C.
2 = Too high. Over 70 °C.
3 = Sensor fault (No sensor detected or
below -49°C)
Detector DC
saturation level
2
0 or 1
0
2
The amount of background light as
seen by the detector hood.
0 = Within limits
1 = Saturated. The CS140 is
experiencing direct light levels that
are saturating the photo diode
Signature error
0 or 1
3
0 = Signature of entire flash was
checked and matches the stored
version
1 = Signature does not match previous
readings
Flash write error
0 or 1
3
0 = No errors
1 = One or more errors reading user
variables from flash occurred
CS140 Background Luminance Sensor
13