Yokogawa EXA DC402 Dual-Channel Conductivity Analyzer - Manual (Page 39)

IM 12D08E02-01E
5-14 Parameter setting
5-3. Notes for guidance in the use of service coded settings
Don't set or input service code numbers other than the code numbers defined in this manual. Setting an
undefined service code may make the converter malfunction.
When an undefined service code is input by some accident, push the MODE key and escape from the
service level.
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 values, followed by starting measurement. For all other service
codes the instrument will return to commissioning mode after the service code
setting is finished.
Note: For resistivity a fixed display format is used.
Code 3 *CC1 Enter the factory calibrated cell constant mentioned on the nameplate or on the
*CC2 fixed cable. This avoids the need for calibration. Any value between 0.005
and 50.0 /cm may be entered. First choose to set the constant for Cell 1or
Cell 2 (*CC1 or *CC2). The cell constant is set as a combination of a number
in the main display, and a factor in the second line. This gives the necessary
resolution and decimal point placement.
Example: To set 0.00987 cm
-1
first set factor 0.01xC1 in second line then set
number 0.987 in main display.
*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 cancelled.
Code 4 *AIR 1 *AIR 1 and *AIR 2 select by the “NO” key
*AIR 2 To eliminate cable influences on the measurement, a “zero” calibration with
a dry sensor may be done. If a connection box (BA10) and extension cable
(WF10) will be used, “zero” calibration should be done including the connection
equipment.
Code 5 *POL.CK The EXA DC402G has a polarisation check capable of monitoring the signal
from the cell for distortion of capacitive or polarisation errors. If there is a
problem with the installation or the cell becomes fouled, this will trigger E1.
For some application this error detecting can cause unwanted signals during
operation. Therefore this code offers the possibility to disable/enable this
check.
5-3-2. Temperature measuring functions
Code 10 *T.SENS Selection of the temperature compensation sensor. The default selection is
the Pt1000 Ohm sensor, which gives excellent precision with the two wire
connections used. The other options give the flexibility to use a very wide
range of other conductivity/resistivity sensors.
Note: The temperature sensor for both conductivity cells must be the same.
Code 11 *T.UNIT Celsius or Fahrenheit temperature scales can be selected to suit user
preference.