Honeywell APT2000 Series, User Manual, Page: 23 / 48

Note
Note
CAL
ENTER
Note
Note
CAL
Operation
23
Zero point calibration in air
Zero point calibration is only re-
quired when very low conductivity
values are to be measured.
Before you start calibration, remove
the sensor from the process, clean
it and dry it up.
Activate calibration by pressing the
CAL
key.
Using the
Y
,
"
keys enter
mode code “1001” and then press
ENTER
.
Using the
Y
,
"
keys modify the
zero point until the lower display
reads 0
m
S. If required, change the
sign of the zero point!
When there has not been an entry
for approx. 6 sec, the lower display
alternately shows the zero-cor-
rected conductivity value and the
temperature value.
Press
ENTER
to confirm the zero
point.
The Transmitter remains in the Hold
state. You can end the Hold state
with
ENTER
. After 20 sec (mea-
sured value stabilization) the Trans-
mitter returns to measuring mode.
Input and adjustment of sensor factor
This function should only be used
by experts. Incorrectly set parame-
ters may go unnoticed, but change
the measuring properties.
The Transmitter comes with a preset sensor factor of
24.6 for the 5000TC sensor. Should you use another
sensor, you must enter another sensor factor or de-
termine it using a comparison resistor. After that, you
can calibrate the sensor (see Pg. 21).
Resistance measurement in test
mode can only show the correct
value of the test resistor when the
sensor factor has been correctly
determined.
Activate calibration by pressing the
CAL
key.
Using the
Y
,
"
keys enter
mode code “1125” and then press
ENTER
.
Using the
Y
,
"
keys enter the
sensor factor of the sensor in the
main display.
If you do not know the sensor fac-
tor, it can be determined using a
comparison resistor (recommended
resistance value: 100
W
). The sen-
sor factor must be adjusted until the
corresponding resistance value is
shown in the lower display.