IM 12D7B3-E-H
5-3.
Service Codes
5-3-1. Parameter specific functions
Code 1
SC/RES
Choose the required parameter, either conductivity or resistivity. If the parameter
is changed the instrument will go into reset to load parameter specific default val-
ues, followed by starting measurement. For all other service codes the instrument
will return to commissioning mode after the service code setting is finished.
Code 2
4.ELEC
Choose the required sensor type. Normally conductivity and/or resistivity mea-
surements are done with 2-electrode type sensors. At high conductivity ranges,
polarization of the electrodes may cause an error in conductivity measurement.
For this reason 4-electrode type sensors may be necessary.
Code 3
0.10xC
Enter the factory calibrated cellconstant mentioned on the textplate or on the
fixed cable. This avoids the need for calibration. Any value between 0.008 and
50.0 /cm may be entered. The position of the decimal point may be changed
according the visual description in the right-handed page of section 5-2-2.
*NOTE:
If the actual cell constant is changed after a calibration or if the entered
cell constant differs from previous value, then the message “RESET?” will appear
on the second line display. After pressing “YES” the entered value becomes the
new nominal and calibrated cell constant. After pressing “NO” the update proce-
dure of the cell constant entry is canceled.
Code 4
AIR
To avoid cable influences on the measurement, a “zero” calibration with a dry
sensor may be done. If a connection box (BA10) and extension cable (WF10) are
be used, “zero” calibration should be done including this connection equipment.
When using a 4-electrode sensor additional connections are required temporarily
Interconnect terminals 13 & 14 with each other and 15 & 16 with each other
before making the adjustment. This is necessary to eliminate the capacitive influ-
ence of the cables. The links should be removed after this step is completed.
Code 5
POL.CK
The EXA SC202 has a polarization check capable of monitoring the signal from
the cell for distortion from polarization errors. If there is a problem with the instal-
lation or the cell becomes fouled, this will trigger E1. For some application with
very low conductivity and long cable runs, this error detection can cause false
alarms during operation. Therefore this code offers the possibility to
disable/enable this check.
5-8 Parameter setting
Содержание SC202G(S)
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