72-910-16 Rev. N
Page 31 of 43
8. Probe Calibration
Because there are no metal electrodes to foul no re-calibration is required of this toroidal probe
on a regular basis. However, you may want to calibrate the probe initially to get a base-line
reading for future reference.
There are two methods of probe calibration that can be used to calibrate this probe.
In-stream Calibration
– In this method the probe is already installed in the
process flow and is currently reading conductivity. Be certain adequate flow (1
gallon/minute minimum) has been circulating around the probe for at least 15 minutes.
This will ensure the probe temperature has stabilized and a more accurate conductivity
reading will be made.
Step 1
– Move to the Probe Calibration screen.
Step 2
– Draw a sample of the process flow water and measure the conductivity
using a calibrated meter. Be certain the meter you are using to measure conductivity
is temperature compensated. Write down the conductivity value and sample
temperature.
Conductivity____________uS/cm Sample Temperature__________
C
Do not allow the sample to sit for any length of time after being drawn as this will cause the
temperature of the sample to be different from the probe.
Step 3
– Enter the calibrated conductivity value into the Probe Calibration screen.
If the conductivity reading varies more than 25 counts from the reading of the
calibration meter verify the sample temperature is within
1
C of the probe
temperature.
Step 4
– Return to the Home Screen and verify the proper conductivity reading is
displaye
d.
Home Screen
Settings
Conductivity
Calibrate
Reading
1234 uS/cm
Back | Select
Probe Cal
