Thermo Fisher Scientific Alpha pH 2000D - Manual (Page 16)

4 Normal Operation
4.1 Measurement Mode
When the controller/transmitter is powered on, the display first shows all segments briefly, after which
the controller/transmitter automatically enters into the Measurement mode.
Please note: To guarantee accurate readings, the measuring system (transmitter and
sensor) must be calibrated.
pH
MEAS
O C
The mode indicator “MEAS” at the top of the display indicates that the transmitter is in Measurement
mode. The upper alpha-numerical display shows the measured pH or ORP value, while the lower
display shows 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 controlling 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 followed by the corresponding security code in Measurement mode you can switch
relay operation mode from automatic to manual.
For detailed information refer to section 7 “Relay Modes”.
- 11 -