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. The built-in memory (25 readings) allows STORE, RECALL, and CLEAR functionality. Careful use of this meter will provide years of reliable service.
Specifications
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Range (Resolution) |
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Accuracy |
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mV (ORP) |
± 1999 mV DC (1 mV) |
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± 2mV |
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Temperature |
32 to 212oF (<100o;1 o >100o) |
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± 1.0oF |
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0 to 100oC (0.1°<100°;1°>100°) |
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± 0.5oC |
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pH |
0.00 to 14.00pH (0.01pH) |
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± 0.02pH |
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Note 1: Accuracy does not include pH buffer |
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temperature coefficient |
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Note 2: Accuracy specified from 0.02pH to 13.98pH |
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Temperature Compensation |
32 to 212oF (0-100oC) Automatic ‘ATC’ |
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Power |
9 volt alkaline battery |
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Display |
Dual LCD display for simultaneous pH and temperature |
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readings |
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Over-range or open indication |
Displays "HHH" for over-range or open input conditions |
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Displays “LLL” for under-range |
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pH Calibration points |
4.00, 7.00, 10.00 (1, 2, or 3 point calibration can be |
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performed) |
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Auto Power OFF |
10 minutes from last key-press (can be disabled) |
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Low Battery Indication |
Fill bars in the battery display icon |
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represent |
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battery power status. The fewer the |
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bars, the weaker |
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the battery power. |
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Dimensions / Weight |
4.25 x 3.00 x 1.18" (108 x 75 x 30mm) / 4.8 oz. (135g) |
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Accessories supplied with kit |
Battery, suction cup holder, clip holder, stick electrode |
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for model PH220-S, standard electrode with 39” cable |
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for model PH220-C. |
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Model PH220 Version 3.1 11/2005 |
Meter Description
1.Battery Compartment (under holster)
2.Rubber Holster
3.LCD Display
4.Function buttons
5.Electrode input
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2
3 7.00
4
5
Basic Display Description
1.Measurement value
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Battery status |
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3. |
Units of measure |
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4. |
Temperature units |
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5. |
Solution temperature |
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Note that there are other more specialized displays that appear on the LCD that have not been included in this basic operation display description. Other display icons are used and are discussed in the appropriate sections of this manual.
Order of Operations
1.Calibrate the instrument as described later in this manual.
2.Determine the test type (pH or ORP) and carefully follow the directions for the desired test.
3.Configure the meter to display in the desired units of measure for temperature (oC or oF). This is included as a step in the pH measurement instructions.
4.Pay close attention to detail, step by step instructions, and electrode cleaning/rinsing recommendations. Slight deviations in test procedures and test habits can have a significant effect on test results.
3 |
Model PH220 Version 3.1 11/2005 |
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