Galvanic Applied Sciences 943-TGS-CE, Operation Manual

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Revision 5 46 August 2021
3.5.2 Digital Outputs (Relays)
There are four digital outputs on the analyzer which are used for outputting analyzer status
and other operational condition data. These digital outputs are all zero potential form C relay
contacts, each isolated to 250 V
rms
. The four status and operational relays are
Status
,
Service , Mode , and Control . Each of these relays has an associated status indicator on the
analyzer display for visual confirmation of the analyzer status
3.5.2.1 Status
The
Status
output indicates whether there are any faults present that will force the
analyzer into back-purge mode until the fault is cleared. Table 3 describes the Status
relay states.
Table 3: Status Relay States
State Display Indicator Colour Explanation
Normal Green
All monitored system parameters are
within normal limits. No faults are present
Fault Red
At least ONE of the following conditions
is true:
• Analyzer power is off
• Measurement Cell temperature
is outside specified range
•
Probe temperature is outside
specified range
• Measured sulfur vapour
concentration is above specified
fault setpoint
• Spectrometer parameters are
outside specified range
•
The system computer is unable
to communicate with the I/O
board
• The system computer is unable
to communicate with the
spectrometer
An analyzer with at least one fault condition present will be unable to carry out sampling
and analysis of the process gas. When the fault condition clears, the analyzer will
automatically perform an auto-zero calibration and then return to normal sampling mode.
3.5.2.2 Service
The Service output indicates whether there is an issue with the analyzer that requires
operator attention. Table 4 describes the Service relay states.