Thermo Fisher Scientific Alpha pH 500 - Manual (Page 22)

18
6.6 Configuration
6.6.1 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  and  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.
6.6.2 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.
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD
SETUP
HOLD