Service Codes; Parameter Specific Functions - YOKOGAWA SC202G (S) User Manual

5-8 Parameter setting

5-3. Service Codes

5-3-1. Parameter specific functions

Code 1 SC/RES
Code 2 4.ELEC
Code 3 0.10xC
Code 4 AIR
Code 5 POL.CK
IM 12D7B3-E-E
Choose the required parameter, either conductivity or resistivity. If the parameter
is changed the instrument will go into reset to load parameter specific default
values, followed by starting measurement. For all other service codes the
instrument will return to commissioning mode after the service code setting is
finished.
Choose the required sensor type. Normally conductivity and/or resistivity
measurements 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.
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
procedure of the cell constant entry is canceled.
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
influence of the cables. The links should be removed after this step is completed.
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
installation 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.