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Installation, Commissioning and Maintenance Instructions
The Accessory enclosure enables flammable gas detectors with a pellistor mV bridge output to be
connected to Gasmaster or any other 4-20mA control panel. These instructions refer to Crowcon's
Gasmaster system, but can be used as guidance for any similar control system. Other 4-20mA
type gas detectors or fire detectors should be connected directly to the Gasmaster panel.
The Accessory Enclosure contains between 1 and 4 sensor amplifier PCB's which convert the
sensor mV bridge signal to a 4-20mA signal which can be monitored by the control panel. The
amplifier PCB's are designed for use with catalytic beads rated at 2V dc 300mA (approx).
To enable an Accessory Enclosure to be used, the Gasmaster must be fitted with the appropriate
connector and wiring loom. If the connector was not fitted when the Gasmaster system was
ordered, it can be purchased and fitted at a later date (see spare parts and accessories section for
the part number).
1. Installation
The Accessory Enclosure should be fixed to a wall adjacent to the control system using the 6mm
(1/4") mounting holes provided. The enclosure is supplied with a 75cm (3') lead fitted for simple
connection to the Gasmaster panel. The flammable gas detectors should be connected directly to
the Accessory Enclosure as shown in Figure 2. An earth continuity plate is fitted for bonding cable
glands.
Sensor amplifier
PCB's (1 to 4
may be fitted)
Cable glands (supplied
by customer)
M07642
Issue 4
January 2015
www.acornfiresecurity.com
Accessory Enclosure
Connection lead to
Gasmaster
Figure 1 Accessory Enclosure Layout
www.acornfiresecurity.com
Screw-lock
connector
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Table of Contents
Related Manuals for Crowcon Gasmaster 1
Summary of Contents for Crowcon Gasmaster 1
- Page 1 The Accessory enclosure enables flammable gas detectors with a pellistor mV bridge output to be connected to Gasmaster or any other 4-20mA control panel. These instructions refer to Crowcon’s Gasmaster system, but can be used as guidance for any similar control system. Other 4-20mA type gas detectors or fire detectors should be connected directly to the Gasmaster panel.
- Page 2 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).
- Page 3 www.acornfiresecurity.com 2. Commissioning The following procedures should be repeated for each detector connected to the Accessory Enclosure. 1. When the detector has been connected, ensure that the ‘Head Volt’ potentiometer VR5 (see figure 3) on the amplifier PCB is set to its fully clockwise position (a clicking sound will be heard when the potentiometer travel is at its limit).
- Page 4 3. Maintenance Detectors connected via an Accessory Enclosure should be calibrated and maintained in accordance with the instructions provided with them. As a minimum Crowcon recommends that detectors are tested every six months and re-calibrated as necessary. All alarm output functions from the control panel should be verified on a six-monthly basis, and connections between the Accessory Enclosure and the detectors and control panel should be check to ensure they are secure.
- Page 5 Any service by 3rd parties not authorized & certified by Crowcon will invalidate the warranty on the equipment. Use of alternative manufacturer’s sensors which have not been approved by Crowcon will invalidate the warranty of the product as a whole. The warranty does not cover misuse or abuse of the unit.
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