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2.8 Connecting input devices
Gasmaster may be fitted with between one and four
input modules (one only for Gasmaster 1) of the
following types:
• 4-20mA/Fire module for 4-20mA type detectors,
conventional smoke/heat detectors or ESU.
• mV Pellistor module for mV bridge type flammable
gas detectors.
Details of hardware configurations and link settings can
be found in section 2.8.1 to 2.8.6.
4-20 mA Inputs
Gasmaster provides analogue 4-20 mA inputs with a
sensor supply voltage of 19 to 28 V dc and measures the
signal across a 98 Ω sense resistor.
Inputs can be gas detectors or flame detectors in 4-20
mA 2-wire sink, or 3-wire sink or source configurations.
Gasmaster will track inputs from 3 to 21.5 mA at which
point an ‘over-range’ fault will be indicated. Connection
details are shown in section 2.8.1 and 2.8.2.
2. Installation
Summary of Contents for Gasmaster
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