Getting Started; Calibration (Ph) - Extech Instruments PH210 User Manual

Getting Started
1. Calibrate the instrument often, as described in a later section. Note that only a pH calibration
is required; mV (ORP) is calibrated as a by‐product of the pH calibration.
2. Set the unit of measure for solution temperature (
Units Selection section of this guide.
3. Determine if Automatic or Manual temperature compensation will be employed. Refer to
the Temperature Compensation section of this guide for details.
4. Follow the instructions and electrode cleaning/rinsing recommendations closely as slight
deviations in test procedures can have a significant effect on test results.
Calibration (pH)
Calibration Considerations
This pH meter was factory calibrated by mV signals simulating an ideal pH Electrode in a 25°C
(77°F) environment. An ideal electrode will produce 0.0mV at pH of 7.00 in ideal conditions.
Electrodes are imperfect however and the temperature at which tests are taken is not always
ideal. To maintain a high level of accuracy, and to accommodate any given application, choose a
calibration method from the selections below:

Basic Calibration (single point calibration): pH 7.00

Complete Calibration (two points): pH 7.00 then pH 4.00 or pH 7.00 then pH 10.00
The meter should be calibrated once per testing session. Calibration is performed using standard
buffer solutions at room temperature 25°C (77°F). Calibration should always be performed using
the pH 7.00 buffer first, followed by a second calibration buffer if desired. Select the pH 4.00
buffer for the second calibration if typical measurements will be lower than pH 7.00 or use a pH
10.00 buffer for the second calibration if typical measurements will be greater than pH 7.00. If
the display shows "ERR", clear the existing calibration data as discussed in the pH Calibration
Procedure below, and perform the calibration again.
pH Calibration Procedure
1. Place the electrode in a buffer solution. Power the meter ON and simultaneously press and
release the REC and HOLD buttons; 'CAL' appears in the lower left corner of the display.
2. Use the up and down arrow buttons to scroll through the 4, 7, and 10 calibration points and
the Clear function (CLr). Once the correct point is selected press the ENTER button. The
reading will flash for several seconds and then END will appear. Calibrate to the other
buffers in the same way.
Note: If there is a deviation of more than 1 pH unit from the 4, 7, or 10 pH buffer, or if the electrode
slope is low, the instrument will assume an error and abort the calibration (ERR will be displayed). In
this case, clear the calibration data (see step 2 above) and perform the calibration again. If the
problem persists, the electrode may require replacing.
3. For multi‐point calibration, use the arrow buttons to scroll through the calibration points as
described in step 2. Always calibrate with a pH 7 buffer first, and then follow with pH 4 or
pH 10. Rinse electrode and probe with distilled water between calibration buffers.
4. Press ESC at any time to abort the calibration and return to the normal operating mode.
800.561.8187
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C or F) as described in the Temperature
PH210-en-GB_v1.3 11/14
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