Thermo Fisher Scientific Alpha pH 2000 - Manual (Page 21)

4 NORMAL OPERATION
4.1 Measurement mode
When the controller is powered on, the display first shows all segments
briefly, then the transmitter automatically enters into the Measurement
mode.
Please note: To guarantee accurate readings the measuring system
(controller and sensor) must be calibrated.
MEAS
P
H
O C
The mode indicator “MEAS” at the top of the display indicates that the
controller is in Measurement mode. The upper alpha-numerical display
shows the measured pH or ORP value, while the lower display shows either
the temperature value if the controller is set for pH measurement, or “ORP” if
it is set for ORP measurement.
The annunciators “pH”, “mV” or “%” at the upper right side of the display
indicate the current measurement mode setting whether the controller is set
for pH, mV or ORP % measurement.
From Measurement mode you can access Calibration mode and Setup
mode by pressing the CAL key or ENT key followed by the corresponding
security code. For detailed information refer to section 5 “Calibration
mode” or section 6 “Setup mode”, respectively.
By pressing the REL key in Measurement mode you can view the actual
relay set points. By pressing the MODE key in Measurement mode you can
switch relay operation mode from automatic to manual.
For detailed information refer to section 7 “Relay Modes”.