CMR Controls manufactures low pressure and air flow measurement and control systems for standard air conditioning, clean rooms, sterile laboratories, microchip production areas and fume cupboard extract systems.


The company was founded in the UK in 1978 and over the years many thousands of its pressure transmitters and velocity transmitters have been incorporated in vav and room pressure applications worldwide.
The systems consist of individual components which are compatible with all bms.
v Precision low pressure transmitter
v Room pressure controllers
v High accuracy velocity transmitters
v Velocity controllers
v Duct velocity averaging probes
v Room pressure monitors and alarms
v High pressure transmitters
v Supply/extract/fresh air synchronisers
v Temperature and humidity transmitters

VAV variable air volume application
The drawing shows a typical application for CMR duct averaging velocity Veloprobes,
V-sensors and P-sensors.
The supply air duct can either be fitted with one central Veloprobe or individual Veloprobes on each of its branches. In many cases, the positions of the Veloprobes are very much dictated by the design of the building. The CMR Veloprobe can be fitted in almost any position in order to provide the necessary results.
In a single supply and single extract duct application the V-sensor measures the building's actual supply and return volumes. As both V-sensors are calibrated to provide a linear air volume signal, synchronisation of supply and extract air is made simple. The Veloprobes are easily adjusted by the commissioning engineer during final commissioning.
For multiple duct applications, the total supply air volume is derived by adding measurements from individual ducts. The same applies to the return air where the following formulae can be applied:
S = E 6 an offset for positive or negative 
	building pressure
S1+S2+S0 = E1+E2 6 offset
S = E1+E2 6 offset
Veloprobes are made to specification up to 4 m length. The V-sensor is designed for nominal flows of 3, 9, 13, 20 and 28 m/s. Other ranges are available on request.
All V-sensors and P-sensors can be interlinked with a bms system or the MPC 100 computer network in order to achieve easy remote scaling and controlling.
In order to specify the devices quote:
(a)	duct size and shape
(b)	air volume in cubic metres per second
	and metres per second
(c)	type of bms or control needed, ie 0 - 10 V, 		4 - 20 mA or RS 485 signal
(d)	mounting position
(e)	distance from mounting position of
	V-sensor to Veloprobes
Above:
The Veloprobe Set is available in any length and is purpose made for each duct. The Mini Veloprobe is designed for attenuator passage ways, vav boxes or small ducts.
Right:
The V-sensor is a wall mount micro manometer with linear square root output to provide true m/s when Veloprobes are tuned to pitot tube characteristics. The optional lcd display is calibrated in m/s.
Simply connect a pitot tube to the sensor and carry out a pitot traverse reading in order to calibrate the Veloprobes. The V-Sensor could eliminate the carrying of inclined gauges or manometers.


PS 510
P-Sensor
Cal-Calibrator
F-Sensor
DPC 100 Controller

APM Alarm Monitor