Precision gas mixing for clinical environments
01 November 2006
Free standing gas mixing systems supplied by Witt Gas Techniques are being used by one of the UK’s leading NHS Hospitals to supply high purity air to their operating theatres and intensive care wards. The MG 50, 100 and 200 range of gas mixing systems are specifically designed for the generation of high purity (synthetic) air from oxygen (0-25% mixing range) and nitrogen. They provide high process reliability utilising precision mixing, better than +/- 0.5% abs. Two independent integrated oxygen analysers are provided for permanent monitoring and documentation of the gas mixtures, whilst pressure sensors, monitor the gas supply. If the inlet pressures become too low an optical alarm is triggered and the system is shut down until re-set. A lockable protective door protects the required settings from alteration and the system has self-monitoring of the analysers.
The capacity range is from 0 – approx. 232Nm3/h dependent upon the model required. They are easy to use with a knob controlling a proportional mixing valve and a percentage scale providing infinitely variable mixture settings with a setting accuracy of +/-1%. Intermittent gas mixture withdrawal is possible from zero to the maximum flow capacity of the system.
Each system has a RS232 interface with ASCll- output of date, time and measurement value.
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