Crowcon Gasmaster 1 Instruções de instalação, colocação em funcionamento e manutenção - Página 2

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Connecting Detectors

Warning: The Accessory Enclosure is designed only for use with 24Vdc 4-20mA control systems,
on no account must mains voltages be applied to the product.
Connect the positive, signal and negative terminals of the detector to the corresponding terminals
of the appropriate Accessory Enclosure amplifier PCB using cable with a minimum core size of
2
2
1.0mm
(2.5mm
maximum). Crowcon recommend the use of steel wire armoured cable, but other
cables types may be used provided appropriate standards are met.
Important: please note the correct polarity of the detector and the amplifier PCB, ensure
that connections are made as shown in Figure 2 (i.e. +ve to +ve, -ve to –ve, sig to sig). If
Crowcon's Xgard Type 3 detectors are to be connected to the accessory enclosure please
ensure connections within to the Xgard PCB are made with the polarity shown above (the
Xgard -ve terminal is top, the +ve terminal is bottom). Remove and disregard labels that
may be fitted to the detector PCB showing an inverted polarity.
Four detector cable holes are provided for M20 or ½"NPT cable glands. Gland holes are accessed
by removing the blanking plugs. Cables screens should be earthed using the grounding plate fitted
inside the Accessory Enclosure. The amplifier PCB's are designed to allow detectors to be fitted up
to 1km (0.6 miles) from the Accessory Enclosure.
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Figure 2 Accessory Enclosure Wiring
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