Instruction manual

Single Buffer Calibration

1. Ensure that all buffers are at room temperature.

If samples are at varying temperatures, temperature

compensation is recommended. (See meter

instruction manual.)

2. Set up meter according to meter instruction manual.

3. Rinse electrode first in distilled water and then with the

buffer being used for calibration (the buffer should be near the

expected sample pH). Place the electrode in the buffer.

4. Wait for a stable display. Set the meter to the pH value of the

buffer at its measured temperature. See Table 1. (A table of pH

values at various temperatures is supplied on the buffer bottle.)

Proceed to pH Measurement section.

pH Measurement

1. Calibrate the electrode as described in above procedure.

2. Rinse the electrode with distilled water and then with sample.

3. Place the electrode in the sample.

4. When the display is stable, record sample pH.

Electrode Maintenance

1. Inspect the electrode for scratches, cracks, salt crystal

build-up, or membrane/junction deposits.

2. Rinse off any salt build-up with distilled water, and remove any

membrane/junction deposits by holding junction open under

running distilled water.

3. Drain the reference chamber, flush it with fresh ROSS

Internal

Filling Solution, Orion 810007, and refill chamber.

Cleaning Electrode

General — Soak in 0.1 M HCl or HNO3 for half an hour, followed

by soaking in pH Storage Solution for at least one hour.