IM 12B6C3-E-E
Appendix 10-5
10-4. Setup for other functions
• Current outputs
Transmission signals for the measured parameters and FAIL signals can be set up in service codes 30
to 39.
• Diagnostic Checks
Impedance checks, response time and stability checks are all included in the PH202. In order to get
the best performance from each of these features, the converter should be fine tuned according to
experience in the installation, and for the particular sensors selected. Service codes 3, 4, 5 & 20 all
contribute to the diagnostics. Please note that the default settings provide an excellent starting point
and provide most valuable information about the performance of the electrode system.
• Communications
The proprietary HART (FSK) communication link allows remote configuration and data retrieval through
the PC202 communication package. This is an excellent tool for the maintenance engineer, quality
engineer or plant manager. Service codes 60-69 are used to set up the communications.
• Logbook
In combination with the communications link, a “logbook” is available to keep an electronic record of
events such as error messages, calibrations and programmed data changes. By reference to this log,
users can easily evaluate diagnostic information to determine predictive maintenance schedules. For
example, by monitoring the deterioration in the slope of the pH sensor, it can be changed before a
failure (or process shutdown) occurs.
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