PART THREE - OPERATION
SECTION 4 - TRANSMITTER CALIBRATION
PRO-series Model E3 Electrodeless Conductivity Transmitter
5
☞
4.3 Conductivity
Calibration
COND CAL Method
7.
With the dry sensor held in air, press
ENTER key
again
to start automatic zeroing.
NOTE:
During zeroing, the analog output is automati-
cally “held” at the last measured value.)
8.
After the “ZERO: CONFIRM ZERO OK” screen ap-
pears, press
ENTER key
to end zeroing.
9.
After the “ZERO: CONFIRM ACTIVE?” screen appears,
press
ENTER key
to return the analog output to its ac-
tive state (MEASURE screen appears).
This completes zeroing the sensor.
After zeroing the sensor (first-time sensor calibration only),
calibrate the sensor span using one of these methods:
•
COND CAL Method:
This method requires removing
the sensor from the process, immersing it into a con-
ductivity reference solution, and entering a reference
for temperature compensation, and the known linear %
per
°
C slope and conductivity value of the reference
solution.
•
SAMPLE CAL Method:
This method allows keeping
the sensor installed in the process, but requires you to
obtain a process sample, determine its value by labo-
ratory analysis or comparison reading, and enter that
value.
1.
Prepare the conductivity reference solution using your
normal method. Its value should be near the typical
measured process value for best accuracy. When the
value is relatively low (between 200 and 100,000 mi-
croSiemens/cm), the data in TABLE E on the next page
can be used to prepare the reference solution. Add the
listed grams of pure, dried NaCl to one liter of high pu-
rity, de-ionized, CO
2
-free water that is 25
°
C to obtain
the listed conductivity. Solution conductivity can be de-
creased by dilution with de-ionized water.
