18. Trouble-Shooting
Dr. A. Kuntze
I
Gutes Wasser mit System
Robert-Bosch-Str. 7a
40668 Meerbusch
+49 (0) 2150-7066-0 / Fax -60
www.kuntze.com
84
Event message
Cause
Suggested remedies
Check measuring
input 1
The measuring input
receives no proper signal
Check sensor plug, check
cable, check sensor
This message appears if the measuring circuit is interrupted.
Here again the cause may be quite simple
– the connector might not be properly
plugged to the sensor, or the wires of the cable might not be properly screwed into
the terminals. The cable might be broken somewhere, typically at the uninsulated
ends. You can check the cable with a common multimeter and cable and measuring
input of the instrument with the PH-T.
Testing the input with the PH-T
Connect the PH-T with the BNC/Coax adapter to the pH cable of the instrument, as if
it were a sensor. Select the function M1/ mV output, and check if the mV values you
set with the PH-T are properly recorded by the instrument in the menu
SYSTEM=>INFO=>VIEW. Deviations up to 5mV are irrelevant. If you find large
deviations, repeat the test with a different cable. Also check if the signal changes
abruptly if the cable is gently moved in the vicinity of the sensor head.
If all tests turn out well, the problem is probably located at the sensor. The simplest
explanation is that the sensor is not sufficiently immersed. Make sure that the sensor
is immersed at least so that the junction is completely covered.
With refillable sensors, the measuring circuit is interrupted if the level of the filling
solution drops below the reference element or, with double-chamber sensors, below
the internal junction. In that case refill the sensor and remove any air bubbles within
the internal junction by gently shaking the sensor.
The easiest way to check if a sensor is defective is to connect another sensor or the
pH-T to the instrument to see if it shows the same results. If the measurement works
fine with the other sensor, check the contact in the original sensor´s connector and
open the spring parts of the central pin slightly and carefully to ensure good contact
to the cable.
Summary of Contents for Neon pR
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