The Gasguard range includes toxic gas sensors, a flammable gas sensor and an intrinsically safe programmable controller. According to Ampcontrol, the sensors can continually monitor toxic gases, such as carbon monoxide, hydrogen sulphide and oxygen, and flammable gases, such as methane.

Non-intrusive calibration can be carried out using a magnetic pen. The sensors feature an LCD display, provide a 4-20mA signal and require an intrinsically safe 12VDC supply. They are housed in a robust cast stainless steel enclosure for the tough, arduous environments found in underground coal mining.

The intrinsically safe programmable controller is a four-channel microprocessor controlled unit designed to receive and process input signals from various types of sensors. There are three setpoints per channel and corresponding outputs are produced to drive tripping devices and visual indicators. The controller can be set up via a front keypad or through the Modbus port.

Ampcontrol says VoiceCom is a multi-station audio communication system for longwall and conveyor operations. It has a pre-start alarm and offers voice messaging capabilities.

VoiceCom has two main components: the VCA Controller which regulates two communication lines with up to 31 amplifiers per line, and the VAA Amplifier, a field communication module for the system featuring an internal microphone and connections for two speakers.

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