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MODEL 1054B C
5.5 Routine Standardization. The sensor should be
standardized routinely if it is suspected that the
process might degrade or coat the sensor. When a
sensor cell constant is entered CEL is set to this value
and the cell factor Fct is set to 1.000. The first stan-
dardization recalculates the cell constant CEL.
Subsequent standardizations will change the cell fac-
tor Fct. Refer to Section 8.2.3 for a description of the
cell factor.
To perform a standardization do the following:
1.
Take a grab sample which is as close to the sen-
sor as possible. Write down the value the analyz-
er is reading at this time (C1).
2.
Measure the conductivity of the grab sample using
a calibrated bench analyzer referenced to
25°C/77°F or measured at 25°C. Write down this
value (C2).
3.
Before entering the reference value, note the
value the analyzer is reading now (C3) and com-
pare it to the value in Step 1. This accounts for the
change while the grab sample is being measured.
4.
Press the PV key once, then press SELECT. Std
will display briefly followed by the Numeric display
with flashing digit.
5.
The corrected conductivity reference value may
be determined by multiplying the value in Step 2
(C
) by the value noted in Step 3 (C
2
ing the product by the analyzer value from Step 1
(C
):
1
C
x C
2
3
C
1
Enter this corrected reference value in the analyz-
er using the SCROLL (
Then press ENTER.
Note the cell factor value Fct. Press the ACCESS
6.
key twice quickly. SCROLL (
SELECT and note this value. Keep track of this
value to determine a sensor cleaning schedule.
30
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) and divid-
3
= C
RV
) and SHIFT (
) keys.
é
ç
) to Fct press
é
5.6 Sensor Maintenance. Before performing mainte-
nance or cleaning of the sensor, the Model 1054B
C should be placed in hold. This will place the
current output and relays in the states determined
in Section 4.6. Before removing the sensor from
the process, press the HOLD key twice. The
HOLD flag will show to indicate the hold condi-
tion.
Always reenter the cell constant (Section 5.2) and
restandardize (Section 5.5) after cleaning or replace-
ment of the sensor.
Replace the sensor back into the process and press
the HOLD key twice again to remove the analyzer
from hold. The hold flag will disappear.
SECTION 5.0
START-UP AND CALIBRATION
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