Thermo Fisher Scientific Alpha pH 600 RF (In the process of updating the brand guideline & product image) - Manual (Page 24)

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when the reading is stable. Press ENT key to confirm the reading.
3 The pH Transmitter moves to the second calibration point. The lower
display shows next standard buffer value (pH 4.01). Use ▲ and ▼ keys
to select your second buffer from one of the preset values: pH 4.01 or
10.01. Remove the electrode from the first buffer, rinse and then immerse
it into the second buffer. Allow the reading to stabilize. LCD shows
‘READY’ annunciator when the reading is stable.
Press ENT key (or CAL key) to confirm the reading.
4 The calibration is completed. The pH Transmitter re-calculates electrode
properties based on the calibration. The new slope (in mV) is shown in the
upper display and normalized temperature is shown in the lower display.
Press ENT key to exit from the calibration.
55 The pH Transmitter reverts to pH measurement mode.
NOTE: • To exit from pH calibration mode without confirming calibration,
press ▲ and ▼ keys together.
• When confirming the buffer measurement, if measured pH value is
not within ±1.00pH from selected buffer value, the electrode
annunciator blinks and ERR indicator appears in the display.
This error can also occur if non-standard buffers are used or the
electrode has worn out. If this happens, press both ▲and ▼ keys
together to restart the calibration beginning from Step1.
• When calibrating with manual temperature compensation, the
meter automatically changes from the preset ‘process temperature’
to the ‘calibration temperature’. After leaving the calibration mode,
the pH Transmitter reverts back to ‘process temperature’.
4.3.2 For NIST Buffer
Make sure that the pH Transmitter is set to accept NIST standard buffer in the
Setup mode. (Refer Section 5.4 for Buffer Selection Settings) The factory default is
USA standard. It is recommended that you perform 2-point calibration at room
temperature (25
o C), starting with the first buffer at pH 6.86 followed by any other
buffer value. (pH 4.01 or 9.18)