Extech PH220 Operating Manual
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
Range (Resolution)
mV (ORP) ± 1999 mV DC (1 mV)
Temperature 32 to 212oF (<100o;1 o >100o)
o
0 to 100
pH
C (0.1°<100°;1°>100°)
0.00 to 14.00pH (0.01pH)
Accuracy
± 2mV
± 1.0oF
o
± 0.5
C
± 0.02pH
Note 1: Accuracy does not include pH buffer
temperature coefficient
Note 2: Accuracy specified from 0.02pH to 13.98pH
Temperature Compensation 32 to 212oF (0-100oC) Automatic ‘ATC’
Power 9 volt alkaline battery
Display Dual LCD display for simultaneous pH and temperature
readings
Over-range or open indication Displays "HHH" for over-range or open input conditions
Displays “LLL” for under-range
pH Calibration points 4.00, 7.00, 10.00 (1, 2, or 3 point calibration can be
performed)
Auto Power OFF 10 minutes from last key-press (can be disabled)
Low Battery Indication Fill bars in the battery display icon represent
battery power status. The fewer the bars, the weaker
the battery power.
Dimensions / Weight 4.25 x 3.00 x 1.18" (108 x 75 x 30mm) / 4.8 oz. (135g)
Accessories supplied with kit Battery, suction cup holder, clip holder, stick electrode
for model PH220-S, standard electrode with 39” cable
for model PH220-C.
Model PH220 Version 3.1 11/2005 2
Meter Description
1. Battery Compartment (under holster)
2. Rubber Holster
3. LCD Display
4. Function buttons
5. Electrode input
1
2
3
7.00
4
5
Basic Display Description
1. Measurement value
2. Battery status
3. Units of measure
4. Temperature units
5. 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. Other display icons are used and
are discussed in the appropriate sections of this manual.
1
2
5
3
4
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 (
o
F). 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.
Model PH220 Version 3.1 11/2005 3
o
C or
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