Jesco TOPAX L1, Инструкция по эксплуатации и техническому обслуживанию

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Metering Unit Settings | Operation & Maintenance Instructions TOPAX L1/L4/L5 |
1
5. Metering Unit Settings
Calibration of the measurement and display of the slope rate.
Selection of either automatic or manual temperature compensation; for manual compensa-
tion the temperature must be pre-set.
Calibration of the temperature measurement
5.1 Calibration
Potentiostatic measurement requires a 1-point calibration:
The actual concentration of the measurement water is determined using a comparative
method – e.g. by way of photometric measurement with DPD – and this value is set as the
calibration value.
In addition, the measurements are slightly temperature dependent. The effect of tempera-
ture can be either manually or automatically compensated for. For manual compensation,
the temperature is entered manually; while for automatic compensation, it is necessary to
have a temperature sensor connected.
Set the value determined by
the DPD-measurement as
the calibration value.
Calibrations of Cl or ClO measurements
1) As a precaution, set the controller to manual operation.
2) Zero point calibration: When connecting a CS 120 measuring cell, a zero point calib-
ration must be carried out once. The measuring cell is to be run using chlorine-free
water. In the DPD calibration menu the value must be set to 0.00 mg/l using the

and

keys. This value is saved by holding down the

key and then pressing the

key. After this, the measuring cell is to be run with chlorinated water.
3) Obtain a water sample from immediately behind the metering station and determine
the actual contents by means of comparative measurements, e.g. photometric with
DPD.
4) Enter this value in the DPD calibration menu and save this by holding down the

key
and then pressing the

key.
5) Check the displayed slope rate, then set the controller back to automatic.
6) When connecting a potentiostatic measuring cell, the zero point calibration is not
necessary; in this case, it is only necessary to carry out a DPD calibration with chlo-
rinated water.
NOTE!
Details about optimum slope rate and the slope rate alarm limits are found in the
“Error Advisory” chapter.
DPD Calibration
Main menu

DPD Calibration
0.48 mg/l
Slope
025 mV
Calibration
NOTE!