ystem description
The CMR laboratory control system was designed to meet the high standards in safety for operators and to reduce energy costs substantially when closing the sash.

FC-controllers
The CMR fume cupboard (fc) controller is compact, factory tested and ready for installation by any controls company or fc manufacturers.
A nylon bulkhead fitting is normally fitted to either inner wall of the fc above sash opening height. CMR pvc white tube is connected to the bulkheads and to the negative port of the FC-controller. A CMR nylon bulkhead is fitted to the top of the fc, and red pvc tube is connected from there to the positive port of the FC-controller.
As the sash is opened or closed a relative air sample passes through the pvc tube from the top of the fc through the CMR FC-controller, where it is converted into an electric signal and scaled into m/s, and finally leaves via the two inner bulk heads into the extract system. The inner bulkheads are T-pieced together to provide an average suction through the CMR FC-controllers.The air sensing is on the clean side of the fc and cannot be contaminated.
The actual face velocity is then displayed on an lcd scaled in m/s. The display plate also incorporates high/low flow alarm, sash high alarm, emergency exhaust panic button and a facility to display the set point ie 0ú5m/s.
In order to control the face velocity a fast acting CMR extract damper motor is fitted to the CMR exhaust damper thus keeping the face velocity constant regardless of sash height. The system is totally pressure independent.
The CMR FC-controller is fully software accessible and any parameter can be changed or information displayed on any pc via the CMR two wire bus. As an option the FC-controller can be supplied with a remote