CWP Accurate pH 3 User manual

© 2008 CWP Instruments 1.888.433.6867 www.cwpmeters.com
Operating Instructions for the Accurate pH 3 meter
Specification: Accurate pH 3 meter
Range: 0.0-14.0 pH
Resolution: 0.10 pH
Accuracy: ±0.10 pH - Suitable for Laboratory / Classroom Experiments.
Operating Temp: 33-120 Degrees Fahrenheit
Calibration: 2 point
Power supply: DC 4 x 1.5 v (Two (2) LR44 AND Two (2) GP189 or equivalent)
Size: 160 x 25 x 24 mm
Weight: 75g
Waterproof to 1 meter for brief periods only.
Replacement or Repair Warranty: 6 months for defective parts and materials from date of
manufacture. Proof of purchase required. Warranty does not cover abuse.
Operating Manual for the Accurate pH 3 Meter
1. Remove the electrode protector and switch the meter to the ON position.
2. If using this meter for the first time or the meter has not been used for a long time, it needs
calibration for accurate readings. Skip to the calibration section. Then return to step 3.
3. Dip the meter’s electrode into a small sample of the solution to be tested. Stir gently, stop and
wait for the displayed value to stabilize. The readout number is the pH value of the solution.
Note: Never dip the meter into a large body of solution as you may drop it in and ruin the
meter. Test small samples only. See pictures.
4. Immediately after finishing your test, dip or rinse the electrode in distilled water. Stir gently.
Then use tissue paper to blot the excess water from the meter’s body and the electrode’s glass
bulb. Replace cap. Note: Do not allow the solution that you are testing to dry on the glass
electrode or allow the glass electrode to dry. Also, blotting action must be carefully done in
order not to damage the glass bulb.
5. When storing the pH meter switch the unit to the OFF position. Complete step 4. After step 4,
put a few drops
of Store It! storage solution on the sponge inside the cap to keep the glass
bulb moist but not soaking. Then put the cap onto the pH meter and store it in a cool place out
of direct sunlight and moisture. For extended storage time take the batteries out of the meter.
As with any pH meter of this caliber, do not allow the electrode to dry out, as this will shorten
the meter’s life. Dry glass electrode syndrome is not covered under this warranty.
Do not store
with the meter’s electrode submerged in water or solutions.
6. If the unit cannot be switched ON or the display fades replace all of the old batteries with new
batteries. Use only one brand of batteries. Never mix battery brands.

© 2008 CWP Instruments 1.888.433.6867 www.cwpmeters.com
Calibration of the Accurate pH 3 Meter
This pH meter has a 2-point calibration system for superior
accuracy. Both calibration screws are located inside the battery
compartment. Turn the cap counterclockwise for removal. Battery
compartment removal is necessary for calibration. Control Wizard
Products recommends its brand of pH 7 and pH 4 calibration and
storage solutions, as they are high quality products. Part # NT690,
NT700, NT760, NT770
1. Turn the meter ON, remove the battery cap and pull the battery compartment out of the body. Let
it hang to the side of the body. Place the meters electrode into clean distilled water. Gently stir
and then remove the meter from the water and blot the excess from the meter’s body and glass
electrode with a tissue.
2. Dip the meter’s electrode into a 7.0 pH calibration solution. If the display reads 7.0 proceed to
step 3. If the display does not show 7.0, adjust the calibration screw positioned at the top of the
battery compartment to make it the display read 7.0.
3. Rinse the electrode with distilled water, blot dry and place it into 4.0 pH calibration solution to
make sure the display reads 4.0. If the display does not show 4.0, adjust the calibration screw
positioned at the bottom of the battery compartment to make it the display read 4.0.
4. Rinse the electrode with distilled water, blot dry and place it into 7.0 pH calibration solution to
make sure the display reads 7.0. If the display does not show 7.0, adjust the calibration screw
positioned at the top of the battery compartment to make it the display read 7.0.
5. Calibration is complete when the display reads 7.0. Rinse the electrode with distilled water and
blot the meter with a tissue before making your test.
Battery replacement: Make sure that the cap is screwed on tight after replacing batteries/calibrating
or the meter will not be waterproof.
Note: Inaccurate readings with good batteries generally mean the electrode needs to be replaced.
Contact your local supply store for a replacement. Part Number CW504