Fisher Scientific Benchtop Meter AB200

Ensure periodic standardization with known accurate standards

Select pH calibration buffer group

Attach automatic temperature compensation (ATC) probe

Has the pH electrode been stored dry?

Soak pH electrode in storage solution for 10 minutes if stored dry

Turn meter on and set to pH measurement mode

Rinse pH and ATC electrodes with clean water

Turn meter on and connect a combination ORP electrode (e.g., 13-620-81)

Press MODE if needed for mV (or R.mV) measurement

Select a solution with a known mV value for calibration

Dip the ORP electrode into the selected solution with brief or slow stirring

Press STD to begin standardization

Adjust the value using ▲/▼ keys

Press STD when the reading is stable to accept the calibration offset

Ensure the conductivity electrode is soaked in alcohol or clean water if it has been stored dry.

Turn meter on and select the appropriate mode using MODE button.

Rinse the electrode with clean water.

Submerse the electrode in the first conductivity standard.

Press STD to enter standardization mode.

Is 'Stable' displayed on the meter?

Turn meter on and set to conductivity measurement mode

Soak electrode in alcohol or clean water if stored dry

Rinse electrode with clean water

Submerse electrode in conductivity standard

Provide stirring for best results

Press STD to enter standardization mode

Adjust cell constant manually using ▲/▼ keys?

Place probe into a solution with a known accurate temperature

Press STD from any measurement mode

Observe the active temperature on the upper display

Observe the factory default temperature on the lower display

Adjust the upper display using ▲/▼ keys