User Guide

- 7 -
4 MEASUREMENT MODE
The αlpha pH 190 controller is capable of taking pH (or ORP) measurement with
Automatic (ATC) or Manual (MTC) Temperature Compensation.
The measurements are displayed distinguishingly by the annunciators on the front
panel.
4.1 Measurement mode display
Press the MODE key to toggle between pH (or ORP) and Temperature
measurement mode.
pH (ORP) measurement mode
The controller starts up in the mode when last powered off (pH or ORP).The pH (or
ORP) annunciator will light up.
For selection of pH or ORP measurement mode, see Setup program P3.1.
Temperature Measurement mode
Press MODE key once to view the temperature measurement. The °C annunciator
lights up. The display shows ATC or MTC, then the current measured temperature.
For selection of temperature compensation ATC or MTC, see Setup program P3.3.
NOTE: After pressing the MODE key to display Temperature, if there is no further
key-press, the controller will automatically revert to pH (ORP) measurement mode
after about 30 seconds.
4.2 Set Points Adjustments
You can make quick set points adjustments with the direct access of the Set Points
adjustment modes (SP1 and/or SP2). By just pressing the SP1/▲ or SP2/▼key,
you can enter the Set Point adjustment mode and set a new pH (or ORP) value
that will cause your controller to activate.
Set Point 1 (SP1) adjustment mode
This lets you adjust the pH (or ORP) value in Set Point 1. If this value is crossed,
the set point relay 1 LED will light.
1. Press the SP1/▲ key. The screen will scroll P1.1, SP1, and then the current
set point value.
2. Press the ▲ or ▼ keys and adjust first relay set point. You can adjust it in
0.01 increments from 0.00 to 14.00 pH (-999 to 1000 mV).
3. Press ENTER to confirm and return to the measurement mode.
NOTE: Press ▲ and ▼ keys together (ESCAPE) at anytime, to return to
Measurement mode.