cGas-SD Sample Draw System

The cGas-SD is a self-contained, single sensor, sample draw monitoring system that is designed to draw samples of air from hard to access locations such as shafts, tall ceilings, wells, pits, small rooms and many other locations where it is difficult to install gas detectors. The CGAS-SD-O2 model is designed for use in rooms where compressed gases are used, such as in MRI and NMR rooms. Compressed gases and cryogenic liquids (usually nitrogen, helium and sometimes carbon dioxide) when dispensed, will displace Oxygen, creating an Oxygen deficient or hazardous atmosphere. Continuous monitoring of the Oxygen levels in these rooms is recommended to ensure the Oxygen levels remain safe and people inside the rooms are alerted in the case of a gas leak situation.

The cGas-SD system is designed to be installed outside the target location, at a viewable height, with sample tubing running from the monitoring system to the sampled environment. The sample draw pump pulls air from the area through the tubing, in through the inlet port and over the sensor. The air is then exhausted through the outlet port. If the gas readings are higher than a specified set point, the cGas-SD will go into alarm.

The cGas-SD can be configured with a toxic gas, oxygen or refrigerant sensor and comes with a flow detector, a sample draw pump and an internal adjustable flow meter. Features include one configurable analog output, one alarm level line voltage relay with field configurable time delays and trigger levels, a blocked flow alarm indicating a dirty filter or clogged tubing and an LCD display with LED indicators for channel alarm status and fault conditions.

The filter should be replaced when it becomes dirty and the tubing should be checked regularly to ensure it remains unblocked. For the best response, the sample tubing between the sample point and the inlet port should be kept as short as possible. The device has been factory tested with a maximum of 15 m / 50 ft of sample tubing. The type of gas, diameter and length of tubing will affect the rate of air flow. Testing should be done if longer tubing is required to make sure the air flow is not less than 1L/min.

NOTE: The cGas-SD is NOT available with solid state refrigerant sensors or combustible sensors. Solid state refrigerant sensors do not provide adequate stability; combustible gases can be an ignition source. Should there be a blockage, the pump will pressurize the system, increasing the possibility of combustion/explosion. The material of the valves and diaphragm is not compatible with combustible gas types and the pump is not intrinsically safe.