Extech Instruments PH220 User Manual

7 PH220-en-US_v3.5 3/21
Battery Replacement
The 9V alkaline battery that powers the instrument requires replacing when all battery icon ‘fill
bars’ are depleted. To replace the battery, follow the steps below:
1. Disconnect the electrode.
2. Remove the instrument’s protective jacket by pulling it over the top of the meter (ensure that
the electrode is disconnected).
3. Pry the battery compartment up from the top of the meter using a screwdriver or coin at one
of the two indentations (see diagram).
4. Replace the 9V battery.
5. Insert the battery compartment into the instrument until the compartment is flush with the
top of the instrument. The compartment can only be fully inserted in one direction; the
battery compartment is labeled showing the correct orientation.
6. Replace the protective holster.

Extech Instruments PH220 Specifications

General

pH Range	0.00 to 14.00 pH
pH Resolution	0.01 pH
ATC	Yes
Data Hold	Yes
Temperature Resolution	0.1°C
Display	LCD
Probe Type	pH electrode
Temperature Accuracy	±1°C
Power Supply	Four AAA batteries

Summary

Introduction

Specifications

Details the technical specifications, ranges, and accuracy of the pH meter.

Meter Description

Basic Display Description

Explains the components and readings shown on the meter's LCD screen.

Calibration (pH)

pH Calibration Procedure

Step-by-step guide for calibrating the pH meter using buffer solutions.

'CAL' Reminder Display

Describes the indicator for when the meter needs recalibration.

Measuring pH

Automatic Temperature Compensation (ATC)

Explains how the meter automatically adjusts readings based on temperature.

Automatic Power OFF

Details the auto power-off feature for battery conservation.

Storing and Recalling Readings

STORE Readings

Instructions on how to save measurement data to the meter's memory.

RECALL Readings

Guide on how to retrieve previously stored measurement readings.

ERASE (Clear) Readings

Procedure for deleting all stored measurement data from the meter.

Temperature Offset Adjustment

Battery Replacement

Electrode Maintenance and Troubleshooting

Electrode Storage

Guidelines for proper storage of the pH electrode to maintain performance.

Electrode Cleaning

Methods for cleaning the pH electrode to ensure accurate measurements.

Electrode Troubleshooting

Common electrode issues and their recommended solutions for the pH meter.

Two-year Warranty

Calibration and Repair Services

Contact Customer Support