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5.4 Impedance measurements
To increase the reliability of the pH measurement system, the controller determines the impedance of
the glass electrodes. This measurement is taken every minute. During diagnostics, the pH
measurement reading will be on hold for five seconds. If an error message appears, refer to
on page 20 for more details.
To enable or disable the sensor impedance measurement:
1. Select the main menu icon, then select Devices. A list of all of the available devices shows.
2. Select the device and select Device menu > Diagnostics/Test.
3. For sensors connected to a pH/ORP module, select Impedance status.
4. For sensors connected to an sc digital gateway, select Signals > Impedance status.
5. Select Enabled or Disabled and push OK.
To see the active and reference electrode impedance readings, select Sensor signals (or Signals)
and push OK.
5.5 Modbus registers
A list of Modbus registers is available for network communication. Refer to the manufacturer's
website for more information.
Section 6 Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Explosion hazard. Do not connect or disconnect the instrument unless the environment is known to
be non-hazardous. Refer to the controller Class 1, Division 2 documentation for hazardous location
instructions.
Fluid pressure hazard. Removal of a sensor from a pressurized vessel can be dangerous. Reduce
the process pressure to below 7.25 psi (50 kPa) before removal. If this is not possible, use extreme
caution. Refer to the documentation supplied with the mounting hardware for more information.
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
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