Operating Manual
alpha DO 1000
9
5 MEASUREMENT
5.1
Display in Measurement mode
When the controller is initially powered on, it automatically enters into the
Measurement mode after the large dual LCD displays all segments briefly.
The upper display shows the measured Dissolved Oxygen value, while the lower
display shows the temperature value. Annunciators at the right side of the display
indicate measurement units: ppm, mg/l or % measurement. Similarly annunciators
or icons at the top or left side of the display shows the current status of controller,
e.g. “HOLD”, “SETUP”, “MEAS”, “CAL”, “READY”, etc.
5.1.1
Check electrode performance
To read current electrode slope and offset values without changing them:
1. Press the CAL key followed by the ENTER key without adjusting the
security code (leave code at “000”). The upper display shows the condition
of the probe. The lower display reading shows the temperature reading.
2. Press the ENTER key a second time to return to Measurement mode.
Note: If security code is changed to a value other than “000”,
pressing the ENTER key will return to the Measurement mode,
without displaying electrode information.
5.1.2
Checking set points
To read current set point values without changing them:
1. Press the RELAY Selection (Rel A / Rel B) key. The upper display shows
the set point for Relay A; the lower display shows “SP1”.
2. After two seconds the upper display shows the set-point value for Relay B;
the lower display shows “SP2”.
3. After an additional two seconds, the controller returns to the Measurement
mode.
