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changes all the time (measurement
fluctuations)
local mains
Micro-electrical disturbances
in the measured fluid
Check instrument calibration, if the instrument measures correctly
eliminate the electrical disturbances and refer to point A
4. The sensor calibration procedure
cannot be completed
Old or contaminated buffer
solution kit
Change buffer solution and use a portable kit
Faulty sensor
Adhere to the recommendations below
IMPORTANT TESTS: in cases 2, 3, 4 above, always test operation of the unit with the following steps:
A.
Take down the unit from the system and install it in another room or laboratory without connections to other devices, but directly to the local
mains.
B.
Recreate in a container with fresh water the chemical-physical conditions of the system in terms of pH.
C.
Program the unit and calibrate the electrode
a.
If the results show correct unit operation, this means the issues lie within the system.
b.
If the problem persists, replace the sensor with a new one; if the problem continues, the unit is faulty, contact the Manufacturer or
authorised Dealer.
5. The setpoint relay does not close the
contact
Incorrect setpoint
Correct the setpoint
Incorrect setpoint mode
Change the setpoint operating mode, direct or reverse, on the
functions menu
REMEMBER: unit with universal voltage 100-250 VAC (±10%) or 9-24VDC. If the real voltage is constantly at the limit (minimum or
maximum), or when the peaks are far above the mentioned range, the unit input is electrically protected against voltage fluctuations;
outside the range mentioned above, the instrument does not work and the electric circuit must be replaced.
It is recommended to use voltage protections, check the earthing system and, when other equipment is connected in parallel, use a
transducer. Furthermore, ETATRON D.S. recommends installing a UPS (genset) to assure continuity, thus ensuring no data are lost. A
system that is set up without following the proper electrical design rules, without an earthing system, with frequent ON/OFF operations,
might directly undermine the duration of the electric circuit.
