CMR Controls

Air Flow & Pressure Controls

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.

• Precision low pressure transmitter
• Room pressure controllers
• High accuracy velocity transmitters
• Velocity controllers
• Duct velocity averaging probes
• Room pressure monitors and alarms
• High pressure transmitters
• Supply/extract/fresh air synchronisers
• Temperature and humidity transmitters

VAV variable air volume application

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 +/- an offset for positive or negative building pressure

S₁ + S₂ + S₀ = E₁ + E₂ +/- offset

S = E1 + E2 +/- 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

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