The Caledonian Cater-Safe Solution
 

EMX50 Interlock Control

EMX20 Interlock Control

EMX10 Interlock Control

GLT10 Gas Proving Control

GLT5 Gas Proving Control

EPS10 Pressure Sensor

930/65 Pressure Switch

ECS10 Current Sensor

ECS10/E Current Sensor

Safety Shut Off Valves

Our updated solution revolves around our BS6173:2001 certified interlock controls,  the EMX50, EMX20 and EMX10. They have been fully certified to comply with the BS6173 standard by Germanischer Lloyd (formerly Advantica), an independent NAMAS laboratory. The EMX50 requires an input signal from each fan. This may be from a standard differential pressure switch, in the most basic and most economic form. Alternatively an electronic version can be employed, as in our EPS10, depending upon the amount of differential air pressure available from the fan. Additionally, if preferred, an indirect method of air flow detection may be used, for example our motor current sensors, the ECS10 and ECS10E.  Whilst not our preferred method, our tests have shown that both the ECS10 and the ECS10E can be used reliably and in complete safety.  All our sensors employ the internationally accepted ‘safe start’ procedure.

The choice of sensor can make a considerable difference to the cost of a system and depends on the specific application. If there is enough air pressure difference, at least 0.3 mbar (33 Pa), then a low cost mechanical diaphragm switch can be used. Where appropriate, we can measure for pressure drop and advise on the installation of a suitable set of sensors. In all cases it is important that the volumetric flow is tested and NOT the static pressure.

In installations where gas burning equipment without flame failure operate, our gas leakage GLT10 or GLT5 control must be fitted to comply with BS6173. This would operate after the fan interlock had passed start up, to check if for example an unprotected gas tap has been left open. In this instance, the gas valve would be held shut until the gas tap is closed and the installation re-tested and verified as gas-tight.