Sper Scientific 840087 pH Meter - Basic - Manual (Page 5)

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III. OPERATING INSTRUCTIONS
A. 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 ). Follow the two-point calibration procedures 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.
B. PH MEASUREMENT PROCEDURES
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. To cancel this
function, press the HOLD button again.
6. Rinse the electrode in distilled water after each use.
7. Press the OFF button.