User Guide
16
5.6 Configuration
5.6.1 Selecting pH or ORP Mode of Operation
The alpha pH 500 transmitter is not only a pH transmitter, but also an ORP
transmitter. When configured to measure ORP, electrode must be changed
and calibrated (see Section 5.3 for calibration procedure). ORP values are
measured and displayed in mV only.
1. Press ENT key and use ▲ or ▼ keys to scroll till LCD displays
‘
COF’ (Configuration). Press ENT again.
2. LCD displays ‘
PH’. Transmitter is set to operate as a pH
Transmitter. Use ▲ or ▼ keys to change from ‘
PH’ to ‘ORP’, if
this Transmitter is to operate as an ORP Transmitter.
3. Press the ENT key to accept selection.
4. Press S and T keys together, to return to MEAS mode.
5. If the readings on the Transmitter is fluctuating wildly, please
proceed to Section 6.6.2, for a possible solution.
5.6.2 Selecting Asymmetrical or Symmetrical Mode of Operation
In some applications, there may be some electrical interference in the sample, where the electrode is
installed. The sensitive electrode picks up the signal and the effect is displayed on the LCD.
If the electrical interference is from an AC source, the readings on the LCD fluctuates wildly. If the
source is DC, then readings will be stable, but at a wrong value.
In such cases, switch the Transmitter to the Symmetrical mode as below:
1. Press ENT key and use ▲ or ▼ keys to scroll till LCD displays
‘
COF’ (Configuration). Press ENT again.
2. LCD displays either ‘
PH’ or ‘ORP’ depending on requirement.
Press ENT key.
3. LCD displays ‘
ASY’ (asymmetrical operation). Use ▲ or ▼ keys
to select for ‘
SYS’ (symmetrical mode of operation). Press ENT
key again.
4. Press S and T keys together, to return to MEAS mode.
SETUP
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