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Electron Microscopy Sciences

Technical Data Sheets

Basic pH Meter

EMS Catalog #72087-01

pH Calibration Procedures

The meter is factory-calibrated to simulate the ideal pH electrode (0 mV at pH 7.00 and 177.4 mV at pH4, based on an ambient temperature of 77°F/25°C ).

There are two methods of calibration. Follow the Two-Point Calibration procedure to ensure the highest degree of accuracy:

Two Point Calibration

  1. Connect the pH electrode to the BNC SOCKET.
  2. Press the ON button and place the pH electrode into the pH7 solution.
  3. Using a small screw driver, turn the CAL. PH7 adjustment until the display indicates 7.00.
  4. Rinse the electrode in distilled water and shake dry.
  5. Next, place the electrode into the pH4 solution.
  6. Turn the SLOPE PH4 PH10 adjustment until the display indicates 4.00.
  7. Rinse the electrode again.

Single Point Calibration

  1. Connect the pH electrode to the BNC SOCKET.
  2. Press the ON button and place the pH electrode into the pH7 solution.
  3. Using a small screw driver, turn the CAL. PH7 adjustment until the display indicates 7.00.
  4. Rinse the electrode in distilled water.

pH Measurement Procedure

  1. Connect the pH electrode and press the ON button.
  2. Calibrate the meter (see above instructions).
  3. Place the pH electrode into the solution to be measured.
  4. The pH level of the solution is displayed.
  5. To freeze the displayed value, press the HOLD button.
Note: To cancel this function, press the HOLD button again.
  1. Rinse the electrode in distilled water after each use.
  2. Press the OFF button.

Battery Replacement

When the low battery icon is displayed in the left corner of LCD, replace the battery.

Note: The unit will still be able to take in-spec measurements for several hours after the low battery indicator appears.

To change battery

  1. Slide the battery cover away from the instrument, remove the battery and replace with a 9V battery (alkaline or heavy duty type).
  2. Close the battery cover.

Specifications

Display

LCD, ½" (21.5 mm) digit height
Input Impedance

1012 ohm

Measurement Range 0~14 pH x 0.01 pH
Resolution 0.01 pH
Accuracy ± 0.07pH (pH5 ~ pH9)
± 0.2pH (<pH5, >pH9)
Meter only, after calibration and including error for temperature at 64~82°F (18~28°C)
pH Calibration External pH4 (slope adjustment) and pH7 Cal. adjustment
pH Electrode Any pH electrode with a BNC connector
Operating Temperature 32 ~ 122°F (0~50°C)
Operating Humidity Max. 80% RH
Sampling Time Approximately 0.4 seconds
Power Supply 006P DC 9V battery
Power Consumption Approximately 2.0 mA
Weight (meter) 7½ oz (220 g)
Size (meter) 7¾ x 2½ x 1" (205 x 68 x 30 mm)

Trouble Shooting

If pH meter malfunctions, follow this procedure to determine the problem

  • Replace the battery when the low battery icon is displayed
  • Check that the electrode is correctly connected to the BNC socket
  • Determine if the problem is the pH meter, or the electrode, by either
    1. Substituting a known working electrode for the one in use. OR
    2. Removing the electrode and turning the unit on.
    3. Insert a wire or paper clip into the center hole of the BNC electrode socket while touching the other end of the wire to the outer metal ring. If the meter is functioning, the pH reading should be stable and between 6.00 and 8.00.

Note: If your meter displays a reading while performing steps 1 or 2, replace the electrode.
Note: If the meter does not display a reading after following all trouble shooting steps, contact Customer Service at 1-800-523-5874.

Product Information

Basic pH Meter