ATI
PQ45P pH System
Part 9
– Troubleshooting
37
O&M Manual
Rev-B (7/15)
Unlocked
Transmitter security has just been unlocked.
Displayed just after security code has been
entered.
TC-F25 lock!
The TC selection is in F25 mode, locked at 25º C
Calibration and TC adjustment cannot be
performed while TC is in F25 mode. To allow
access to TC calibrations, change TC mode
from F25 to SENS (sensor).
Meas Break
Leakage detected on measuring electrode of
sensor.
Measuring electrode glass may be cracked or
broken. Electrical noise may falsely trip this
diagnostic. Turn off glass diagnostic feature
and see if sensor operates correctly. If it does
not, sensor must be replaced.
Ref Break
Leakage detected on reference electrode of
sensor.
Reference glass may be cracked or broken.
Electrical noise may falsely trip this diagnostic.
Turn off glass diagnostic feature and see if
sensor operates correctly. If it does not, sensor
must be replaced.
Figure 13 - PQ45 Display Messages
Temperature °C
Resistance
0
100.0
5
101.9
10
103.9
15
105.8
20
107.8
25
109.7
30
111.7
35
113.6
40
115.5
45
117.5
50
119.4
Figure 14 - Pt100 RTD Table
If you suspect that water has gotten into a cable connection on a flow type sensor or into
the plug connection of a submersible sensor, disconnect the cable and allow the parts of
the sensor to sit in a warm place for 24 hours. If water in the connector is the problem, it
should dry out sufficiently to allow normal sensor operation. However, steps 4 and 5
above will have to be repeated after drying to see if the problem is gone.
