Crowcon Environmental Sampling Unit (ESU) Hazardous Area for Xgard

Crowcon Environmental Sampling Unit (ESU) Hazardous Area for Xgard

The ESU Environmental Sampling Unit is designed to make it easier to monitor gases such as chlorine and sulphur dioxide which, because they have a high density and are readily absorbed into many materials, are difficult to detect using conventional point detectors. The explosion proof version may be used for monitoring heavy flammable gases such as LPG. The ESU uses a sampling chamber technique in which gas is sampled using an electric fan. This is installed in the outlet from the chamber and thus draws samples through the system via pipe-work connected to the chamber.

The ESU fan and gas detector must be connected to a Crowcon Gasmaster or Vortex control panel, which will monitor the fan to ensure a sample is being drawn and display the gas level and activate alarms. Wiring diagrams are shown on page 2 of this manual. The sampling chamber is made from high impact ABS and houses a gas detector with its junction box on the outside. Connection points for the electrical supply to the fan are also made externally to the sampling chamber via a second junction box.

Key Features

• Low purchase and maintenance costs – The ESU is ideal for monitoring large enclosed areas such as chlorine stores. One unit can monitor up to 12 metres of pipe, removing the need for multiple sensors mounted at floor level. Less sensors mean lower maintenance costs.
• Adaptable installation options – The ESU is supplied with a range of accessories to suit any installation requirements. It can monitor from a single point, along an entire floor space or even areas subject to flooding such as a wet well. The ESU’s rugged design and high-impact ABS enclosure makes it suitable for use in harsh environments.
• Wide range of sensors – The ESU is used with Crowcon’s versatile Xgard range of detectors, enabling a wide range of gasses to be monitored. A hazardous area certified version is available for safely monitoring flammable vapours.
• High integrity design – The ESU is designed for connection to Crowcon’s class-leading Gasmaster or Vortex control systems, which display gas level and monitor the ESU fan to ensure it has not slowed or stopped. An alarm is raised in the event of a gas leak, fan blockage of fan failure.