Thermo Fisher Scientific CyberScan pH 1000/pH 2500 - Manual (Page 16)

Instruction Manual pH 1000/ 2500
11
6.5 Relative mV Calibration
Relative millivolt calibration is normally used for Redox
sensors in which you set a base value. For the selection
and preparation of appropriate calibration solutions,
consult the instruction manuals for the Redox/ORP
electrodes.
1. Make the appropriate electrode connections and switch on the
meter.
2. Select [Rel] [mV] mode by pressing MODE key repeatedly until
the Relative mV mode is accessed.
3. Press CAL/MEAS key to activate calibration mode. The [CAL]
annunciator displays on top of the LCD. The LCD displays the
absolute mV reading.
4. Select the Base Offset value using the numeric keys. The
resulting value displayed in the measurement mode, is
[Absolute mV displayed] - [Base Offset]. Once this value is
entered, the Redox/ORP probe is calibrated to the selected
standard.
5. Press YES to confirm selected value or NO to cancel and re-
enter the value. If calibration has been successfully performed,
the meter is now calibrated for relative mV measurements.
6. Press CAL/MEAS key to return to the measurement mode. The
primary display shows the measured relative mV readings.
Hint 1: To set the Relative mV offset to 0.0 using the
present calibration solution, proceed to step (5) without
entering any value.
Hint 2: For Redox/ORP calibration, set the Relative mV
offset using the following equation:
[ Relative mV Offset ] = [Displayed Value] - [Value of
Standard/Desired Value]
Hint 3: To recall the selected Base Offset, press SHIFT and
followed by Relative mV Base key on the keypad.