Maintenance - Hach POLYMETRON 8398 User Manual

8.

MAINTENANCE

WARNING: Read the "installation precaution" and "cable connection" chapters
carefully.
o
If there is a doubt concerning the operation of a probe, disconnect it from the
transmitter, leaving it in place on your process and ensure that you obtain the
following resistance values (see 4.1 Cable connection):
R (1-2) | 110 : (at 25 °C) (Temperature sensor Pt100)
R (3-4) | [1...2] : (Secondary coil)
R (5-6) | [1...2] : (Primary coil)
R (3-5) f : (Coil electrical insulation)
o
If the checks performed do not generate any erroneous resistance values, the
probe can be considered to be working properly.
o
If the measurement is still not satisfactory, remove the probe from the process and
calibrate it (see "probe calibration" chapter), set the transmitter to "no temperature
compensation", then check the following points:
Displayed conductivity (K = 2.35)
470 μS/cm
4.7 mS/cm
47 mS/cm
470 mS/cm
Inductive Probe 8398
Simulated resistance
5 k:
500 :
50 :
5 :
18