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User Guide
Waterproof Palm pH Meter
Model PH220A
Introduction
Congratulations on your purchase of the Extech PH220 waterproof pH/mV meter. This
microprocessor-based device with tactile push-buttons is battery operated and ideal for
field use. The PH220 simultaneously displays pH and temperature. The rubber holster
which protects the meter has a magnetic backing for convenient mounting. The built-in
memory (25 readings) allows STORE, RECALL, and CLEAR functionality. Careful use of
this meter will provide years of reliable service.
7.00
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Summary of Contents for Extech Instruments PH220A
- Page 1 User Guide Waterproof Palm pH Meter Model PH220A 7.00 Introduction Congratulations on your purchase of the Extech PH220 waterproof pH/mV meter. This microprocessor-based device with tactile push-buttons is battery operated and ideal for field use. The PH220 simultaneously displays pH and temperature. The rubber holster which protects the meter has a magnetic backing for convenient mounting.
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Page 2: Specifications
Specifications Range (Resolution) Accuracy mV (ORP) ± 1999 mV DC (1 mV) ± 2mV Temperature 32 to 212 F (<100 >100 ± 1.0 ± 0.5 0 to 100 C (0.1°<100°;1°>100°) ± 0.02pH 0.00 to 14.00pH (0.01pH) Note 1: Accuracy does not include pH buffer temperature coefficient Note 2: Accuracy specified from 0.02pH to 13.98pH Temperature Compensation... -
Page 3: Meter Description
Meter Description Battery Compartment (under holster) Rubber Holster LCD Display Function buttons 7.00 Electrode input Basic Display Description Measurement value Battery status Units of measure Temperature units Solution temperature Note that there are other more specialized displays that appear on the LCD that have not been included in this basic operation display description. - Page 4 Calibration (pH only) The sensitivity of a pH electrode degrades over time, it is very important to frequently calibrate the meter to the electrode. pH electrodes can be thought of as batteries in that they run down with time and use. Calibration is performed using standard buffer solutions at room temperature (78°F, 25°C).
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Page 5: Automatic Temperature Compensation (Atc)
Measuring pH Electrodes should always be rinsed before and between samples with distilled or DI (de-ionized) water to remove all traces of storage solution, process media, or previous test solution. Connect the pH electrode to the meter. Turn the meter on using the on/off button . -
Page 6: Storing And Recalling Readings
Storing and Recalling Readings This instrument has the ability to store up to 25 measurement readings. At a later time the readings can be recalled and viewed. Readings are saved even after the instrument has been turned off. STORE Readings The steps below cover the STORE process in detail: Take a measurement as described earlier in this manual. -
Page 7: Battery Replacement
Battery Replacement The 9 volt alkaline battery that powers the instrument requires replacing when all battery icon ‘fill bars’ are depleted. To replace the battery follow the steps below: Disconnect the electrode from the instrument. Remove the instrument’s protective jacket by pulling it over the top of the meter (ensure that the electrode is disconnected). - Page 8 Electrode Maintenance and Troubleshooting Most pH measurement difficulties are caused by the electrode. Careful handling and proper storage of the electrode will increase measurement accuracy and electrode life. Electrodes should be rinsed to remove all traces of storage solution, process medium, or previous test solution.
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Page 9: Calibration And Repair Services
Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables).
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