Operation
Specifications
User Guide
Model
PH50
PH60
Dual LCD
pH Measurements
Display
Single LCD
1.
2.
3.
Remove the protective cap and the electrode cap
pH Waterproof Meter
Models PH50 & PH60
PH Range and Accuracy
PH resolution/accuracy
Temperature Range
Temperature resolution/accuracy
2.0 to 12.0
0.0 to 14.0
Insert the electrode into the sample.
0.1pH / ± 0.3pH
0.1pH / ± 0.2pH
32 to 122oF (0 to 50oC)
0.5o / ± 1.8oF / 1oC
Yes
Press the PWR key to turn the meter on and slowly stir until the reading settles.
The decimal point will blink while the meter is measuring.
—
—
—
Description
pH Calibration (1, 2, or 3 points)
Automatic Temperature
Compensation
A two point calibration with a buffer of 7 plus 4 or 10 (whichever is nearest to the
expected sample value) is always recommended. A one point calibration (choose the
value closest to the expected sample value) is also valid. For best accuracy, always
calibrate at the sample temperature.
Front Panel Controls
Waterproof
Power
Meets IP67
1.
2.
Battery compartment cap
Four (4) LR44 button batteries
After 20 minutes of inactivity
LCD Display (pH & Temperature for PH60,
pH only for PH50)
1.
Place the electrode into a buffer solution (4, 7, or 10) and momentarily press the
CAL key. Note: pH 7 should be calibrated first, then 4 and/or 10 pH.
If meter successfully recognizes the solution “CAL” and the pH value will appear
on the display in two seconds. Note: If the solution is more than 1pH off from the
4, 7, or 10pH standard, the meter will assume an error and abort the calibration.
“EN” will be displayed for one second and then the meter will return to normal
operation.
Auto power off
Dimensions
6x1.5x0.9” (152x37x24mm); 2.3oz (65g)
3.
4.
5.
6.
7.
8.
HOLD /▲ button
PWR (On/Off) button
Electrode
2.
Optional Accessories
•
Tripak buffers pouches, 6 each of 4, 7 & 10 pH plus two rinsing solutions
(Part Number: PH103)
CAL button
•
•
•
•
Tripac buffer capsules, 10 each of 4, 7 and 10 pH (Part Number 650470)
pH 4.01 buffer, pint, (Part Number PH4-P)
Electrode cap with sponge
Protective cap
3.
4.
If the calibration buffer is another value other than 4, 7, or 10, such as 4.1, press
the HLD/▲ button to adjust the value to the correct reading. The adjustable
range for 4pH is from 3.5 to 4.5. for 7pH is from 6.5 to 7.5. For 10pH is from 9.5 to
10.5.
When calibration is complete, the meter automatically saves the value, displays
“SA” and returns to normal operation mode after displaying “EN”.
For a two or three point calibration, repeat steps 1-4.
pH 7.00 buffer, pint, (Part Number PH7-P)
pH 10.00 buffer, pint, (Part Number PH10-P)
Overview
5.
6.
Warranty
pH Overview
Note: Always turn the meter off and then on before calibrating to allow sufficient
time to complete the calibrations during one power cycle.
pH is a unit of measure (ranging from 0 to 14pH) indicating the degree of acidity or
alkalinity of a solution. pH tests are the most commonly performed measurements in
water analysis and reports the hydrogen ion activity of a solution which is an indicator of
acidity or alkalinity. Solutions with a pH less than 7 are considered acidic, solutions with
a pH higher than 7 are known as bases, and solutions with a pH of near 7 are neutral.
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 on sensors and cables). If it should become necessary to
return the instrument for service during or beyond the warranty period, contact the
Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our
website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’
to request an RA number). A Return Authorization (RA) number must be issued
before any product is returned to Extech. The sender is responsible for shipping
charges, freight, insurance and proper packaging to prevent damage in transit. This
warranty does not apply to defects resulting from action of the user such as misuse,
improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or
merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential damages. Extech's total liability is limited to repair
or replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Changing the Displayed Temperature Units (Model PH60 only)
With the meter OFF, press and hold the PWR and CAL buttons until oF or oC appears in
the display. Press the HLD/▲ button to toggle between them. Select the preferred unit
and then press CAL to save. “SA” will appear in the display for one second and then
return to normal operation.
Getting Started
•
Before first use or after extended storage, soak the electrode (with its cap removed) in
a pH 4 solution for at least 30 minutes.
Data Hold
Momentarily press the HLD/▲ button to freeze the current reading. The HOLD display
icon will appear along with the held reading. Momentarily press the HLD/▲ key to return
to normal operation.
•
White KCL crystals may be present in the cap. These crystals will dissolve in the soak
or they can be simply rinsed with tap water.
•
•
Always calibrate close to the expected measurement value.
A sponge is located in the electrode protective cap. Keep this sponge soaked with a pH
4 solution to preserve Electrode life during storage.
Auto Power Off Disable
The meter will shut off after 20 minutes to save battery life if no buttons are pressed. To
disable this feature, with the meter off, press and hold the PWR and HLD/▲ buttons
simultaneously until an “n” appears for 1 second on the display. Release the buttons.
Note: Turning the meter off will reactivate the Auto Power Off feature.
•
Unless directed otherwise, a daily two point calibration is recommended to maintain
accuracy and to verify the condition of the meter and electrode.
Support line (781) 890-7440
Battery Replacement
Technical support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
1.
2.
3.
Remove the two screws from the battery compartment cap
Replace the four (4) LR44 batteries observing polarity.
Replace the battery compartment cap and secure with the screws
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
Up-to-the-minute product information, visit our website:
www.extech.com
Copyright © 2005 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any
form.
V1.0 9/05
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