General Monitors S800, Instruction Manual

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Model S800
12
4.0 Operation
4.1 Notice
This chapter discusses what general maintenance to perform, electrical inputs/outputs, and
re-setting alarm and fault.
4.2 General Maintenance
•
Once the Model S800 has been installed, very little maintenance is required other
than periodic checks to verify the integrity of the system.
•
The minimum suggested calibration requirement is every 31 days.
•
The power sensor and output wiring should be checked for tightness, verifying that
all of the components and devices are connected correctly.
SAFETY WARNING:
Installation and maintenance must be carried out by suitably skilled
and competent personnel only.
4.3 Electrical Inputs/Outputs
The General Monitors catalytic bead sensor (field device) input is made to the terminal block
at the base of the S800 XP housing (see chapter 3 for more detailed installation information).
•
The sensor connections consists of the following three leads; Black = Reference
Bead, White = Active Bead, Red = Sensor power.
•
The Model S800 provides relay outputs for warn and alarm conditions.
4.4 Alarm Conditions
The WARN and ALARM levels are preset at the factory. If the alarm levels require fine
tuning, an UCISC service representative must be contacted to make the adjustment.
At a factory preset of 1% gas by volume (20% LEL), the WARN LED will flash indicating the
presence of the condition. In addition, the optional Remote Indicator Relay circuit will be
activated. If
WARN latching has been enabled, the WARN indication and relay circuit will not
clear unless the Reset/Test Switch has been activated (Manual Reset). Otherwise, the
WARN indication and relay circuit will clear as soon as the gas levels drop below the preset
level (Auto Reset).
At a factory preset of 2% gas by volume (40% LEL), the ALARM LED will flash indicating
the presence of the condition. In addition, the Machine Cut-off Relay circuit will be activated.
If
ALARM latching has enabled, the ALARM indication and relay circuit will not clear unless
the Reset/Test Switch has been activated (Manual reset), otherwise, the ALARM indication
and relay circuit will clear as soon as the gas levels drop below the preset level (Auto Reset).