pH Probe

Description:

pH is an important indicator as it measures the acidity levels (or alkalinity) of the water body. Most pollutants are acidic (including acid rain), and will kill fish and invertebrates at levels that are too high or too low. Most of the bedrock in the Toronto area is Limestone which helps keep levels neutral.

Name of Device:

Sper Scientific Large Display pH pen - 850051

Batteries:

4x Lr44 Button Cells

Alternative replacement Battery types: AG13, L1154, LR1154, 157, SR44, SR44SW, 303, 357

Use:


  1. Turn pH meter on by pressing blue button for 1-2 seconds.

  2. Remove blue protective cap. (Soak pH meter in water or KCl for 10 min prior to use)

  3. Dip end into container with sampled water (bin, tub or cup – not provided)

  4. Submerse end of probe until reading stabilizes. Record pH (1.0-14.0) and temperature (degrees)

  5. Put protective cap back on after use. Add KCl solution (pH Storage solution) or pH7 buffer solution to saturate sponge.

  6. Turn off probe.

  7. Rinse probe and cap with distilled/deionized water after daily use taking care not to touch the bulb. Store moist with KCl (pH Storage solution) or pH7 buffer.


Changing temp units:

8. To switch between °F and °C, start with the unit off, then simultaneously press CAL and the power button.

9. Release both buttons when “C” or “F” is shown.

10. Press ▲ to select the preferred unit, then press CAL to save.


Auto Shut off time = 20 min.

Long term Storage:

  • Store with sponge oversaturated with KCl (pH electrode storage solution) or less preferably pH7 buffer solution. Monitor moistness every month or two and top off if needed.

  • Remove Batteries for Long Term Storage (2+ months of non-use)

  • After long term storage, soak electrodes in KCl Solution for 15-20 min.

Calibration:


  1. Calibrate routinely before use, anytime the readings seem erratic, and whenever the batteries are replaced.

  2. Remove the protective cap.

  3. Clean the electrode with de-ionized/distilled water. Note: Crystals may form in the cap and these can be soaked or rinsed away.Do not touch or rub the glass bulb.

  4. Before first use or after extended storage, soak the electrode in KCL (potassium chloride)solution for 10 to 30 minutes. You can return the KCl solution back to the bottle for use later.

  5. Press the power button for 1 sec to turn on the unit.

  6. For 1-point calibration, dip/stir the electrode into pH 7 buffer solution (you can use the 20ml salinity containers to do so) and press the CAL button. If the probe is damaged or cannot detect the buffer, the unit automatically exits calibration mode after 10 seconds.

  7. During calibration, “CA” flashes on the display.

  8. Then, “CAL” and the pH value are shown. “SA” (save) is displayed as the calibration point is saved. “En” (end) (850050, 850051), or “End” (850052) displays when the calibration ends.

  9. For 2 or 3 point calibration, start with pH 7, then repeat the above steps for pH 4 and/or pH 10. Rinse probes thoroughly in between calibrations.

  10. For the most accurate readings, the temperature of the sample and calibration solutions should be similar. Repeat the above procedures until readings stabilize.

  11. NOTE: If the buffer needs to be adjusted, press ▲ to adjust the displayed value. “SA” (save) is displayed, followed by “En”

  12. You can use the buffer on multiple probes. Once finished, do not put the buffer solutions back in their containers. Dispose as it will contaminate further calibrations.


Manual:

SPER Large Display pH Pens - 850051