Instruction manual

4.2. Preparing the Meter for Calibration

The pH/conductivity/temperature probe included with this meter is designed for use with this

meter only. Do not substitute other types of probes or electrodes. For a replacement probe,

see the “Accessories” section, pages 23 - 24.

Be sure to remove the protective rubber cap of the probe before calibration or

measurement. Immerse the probe in tap water for 10 minutes before calibrating or taking

readings to saturate the pH electrode surface and minimize drift.

Wash your probe in deionized water after use, and store in pH 4.0 or 7.0 electrode storage

solution.

Do not reuse buffer solutions after calibration. Contaminants in the solution can affect the

calibration, and eventually the accuracy of the measurements.

4.3. pH Calibration

This instrument is capable of up to 3-point pH calibration to ensure accuracy across the entire

pH range of the meter. You can perform 1, 2, or 3 point calibration with standard pH buffers

of 4.00, 7.00 and 10.00.

We recommend that you perform at least 2-point calibration using standard buffers that

bracket (one above and one below) the expected sample range. You can also perform a 1-

point calibration, but make sure that the buffer value is close to the sample value you are

measuring.

This meter features three pre-programmed pH buffers (pH 4.00, 7.00 and 10.00). The meter

automatically recognizes and calibrates to these standard buffer values, which makes pH

calibration faster and easier. See page 24 for information on our high-quality Eutech

Instruments pH buffers.

Calibrating for pH:

1. If necessary, press the MODE key to select pH mode. The pH indicator appears in the

upper right hand corner of the display.

2. Rinse the probe thoroughly with de-ionized water or a rinse solution. Do not wipe the

probe; this causes a build-up of electrostatic charge on the glass surface.