Manual 2100-749
Page
51 of 68
8301-089 Humidity Sensor Test Value Outputs
This sensor has the ability to output fixed test signals
when testing/troubleshooting sensor operation.
These settings are to be used for sensor testing/
troubleshooting only and need to be removed before
unit can resume normal operation. These settings allow
the sensor board to output 0% RH, 50% RH and 100%
RH. When these settings are active, the actual humidity
sensor is ignored. DIP switches 1, 2 and 3 are used to
override the output to a test signal. See Figure 75 for
DIP switch/output configuration.
NOTE:
If any DIP switches are disrupted, they will need
to be returned to the off state in order for the
humidity sensor to return to normal operation.
FIGURE 75
8301-089 DIP Switch/Output Configuration
FIGURE 76
8301-089 Sensor: Humidity Probe Troubleshooting
8301-089 Outdoor Humidity Sensor Troubleshooting
To verify sensor operation:
1. Remove lid from outdoor temperature/humidity
sensor.
2. Loosen and remove black wire from the 4-20 mA
input of TB1 (see Figure 73 on page 48).
3. Use an RH meter (preferred method) or local
weather data to find accurate RH reading.
4. Using an ohmmeter or amperage mode on a
multimeter, measure the amperage through the
black 4-20 mA wire leading to the PLC (see Figure
76).
5. Cross reference readings with Table 14 on page 52.
A. If readings are consistent with reference
humidity, verify the DIP switches are all in
the off position, check wiring or offset in PLC
if outdoor humidity value on PLC does not
match.
B. If readings do not match, replace sensor.
