• Air bubbles below the sensor can cause a slow response or error in the measurement. Make sure
to remove air bubbles before and during measurements.
• If the probe is a rugged type, make sure to install the shroud before field use to prevent damage to
the sensing elements. Refer to Remove or install the shroud on page 10. The probe warranty
does not include such damage.
• To deploy a rugged probe at a distance, toss the probe body with a slow underhand throw. Do not
throw the probe by the cable to prevent damage to cable, the probe or the user.
6.2 Sample measurement procedure
1. If the samples
contain reducing
agents, soak the
probe in Reducing
Solution for ORP
Electrodes for 3 to
10 minutes.
2. Rinse the probe
with the sample. Dry
the probe with a lint-
free cloth.
Rugged probes:
install the shroud.
3. Put the probe in
the sample with the
sensor and
reference junction
fully in the sample.
Do not put the probe
on the bottom or
sides of the beaker.
4. Shake the probe
from side to side to
refresh the reference
junction and remove
air bubbles.
Rugged probes:
move the probe up
and down to remove
air bubbles.
5. Stir gently, then
read the ORP/Redox
value of the sample.
The display shows
the mV value when
the reading is stable.
Section 7 Verify the calibration
Measure the value of a fresh ORP/Redox standard solution to make sure that the result is accurate.
Refer to the procedure that follows. The meter compares the selected standard solution value to the
measured value and accepts or rejects the measurement. The user can change the standard solution
and acceptance criteria for verification in the probe-specific settings.
Note: Password protection may prevent access to the acceptance criteria.
8
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