44
Calibration
ORP Calibration
1. Obtain a premixed standard solution that is approved for use
with Ag/AgCl ORP sensors or prepare a standard with a known
oxidation reduction potential (ORP) value. Zobell solution is
recommended.
2. With the probe guard installed, carefully immerse the probe
into the standard solution. Make sure both the ORP sensor and
temperature sensor are submerged.
3. Push the
Cal
key, then select pH/ORP, then ORP.
4. If using YSI Zobell solution, the Calibration value will
automatically be adjusted based on the temperature. Otherwise,
refer to the table included with the standard solution and enter the
mV value that corresponds to the temperature of the solution.
5. Wait for the ORP mV and temperature readings to stabilize; the
white line on the graph should be flat for about 40 seconds.
6. Select Accept Calibration and press the
ENTER
key. “Calibration
successful!” will be displayed in the message area.
Figure 59 Calibrate ORP
NOTE: For 2-Point calibrations, select Accept Calibration before
selecting Finish Calibration.
11. Rinse the probe and calibration cup. Fill to the appropriate level
with the final buffer solution.
12. Immerse the probe into the buffer solution. The Calibration value
will automatically be adjusted based on the selected buffer and
temperature.
13. Wait for the pH mV and temperature readings to stabilize; the
white line on the graph should be flat for about 40 seconds.
14. Select Accept Calibration and press the
ENTER
key. The procedure
will automatically finish after calibrating the third point.
pH Calibration 3-Point (continued)
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