Instruction Manual
α
lpha-pH2000D
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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”.
