Table 10 Measurement Troubleshooting - Vaisala PR-23 Series User Manual

PR-23 Series User Guide
Problem
Message HIGH TRANSMITTER
TEMP
Message LOW TRANSMITTER
VOLT
Relays and switches not working
Output signal error during Normal
operation
Table 10 Measurement troubleshooting
Problem
Message OUTSIDE LIGHT ERROR
94
Cause
The temperature of the motherboard of the Indicating transmitter
exceeds 60 °C (140 °F). To read this temperature, select 3 SENSOR
STATUS from the Main menu and check DTR TMP. If the warning persists,
move the transmitter to a cooler place (for example out of the sun).
The internal DC voltages of the
transmitter are below
specifications.
Check configuration, see Viewing system information (page
possible correction see Configuring input switches (page
Configuring relays (page 66), and
Relay status is indicated by LEDs D23, D25 on the Motherboard, see
Diagnostic LEDs (page 89). For switches, check also LED D26 on the
Motherboard indicating that the 3 V DC supply is correct, see
LEDs (page 89).
The wash function can be tested according to
(page 51).
If there is no output signal:
• Check wiring, see Electrical connections (page
• Check Diagnostic LED D26, see
If the mA signal does not correspond to the concentration display, check
output signal configuration, see
and for possible correction see
mA signal can also be caused by high resistance in the external current
loop, see Electrical connections (page
A noisy signal can be damped, see
(page 59).
Cause
The measurement is not possible
because too much outside light
reaches the camera.
Corrective action
Check the power supply input
voltage. If the supply voltage is
within specifications, replace
power supply module,
(page 86).
Configuring prism wash (page
Testing prism wash
24).
Diagnostic LEDs (page
Viewing system information (page
Configuring mA outputs (page
24).
Configuring output signal damping
Corrective action
Identify the light source (for
example sun shining into an open
tank or a translucent pipe) and
block the light from getting to the
prism at the sensor tip.
IM-EN-PR23-E
Figure 44
55), and for
68),
77).
Diagnostic
89).
55),
70). A low