Pressure sensors aimed at building airflow control

Boiswood are now supplying Setra 265 pressure transducers, designed for use in Building Energy Management Systems, for sensing differential or gauge (static) pressures.

Boiswood, the specialist distributors of components for gas and liquid control, are now supplying Setra 265 pressure transducers for sensing differential or gauge (static) pressures.

Designed for use in Building Energy Management Systems (BEMS), the 265 converts pressure differences into proportional electrical outputs that are capable of measuring pressure and flows with the accuracy necessary to optimise building pressurisation and airflow control.

The 265 models are offered with a high level 5 VDC output or a 4-20 mA output that is compatible with all energy management systems.

As very low-pressure transducers, they are suitable for air pressure ranges as low as 0.25in WC full scale up to 100in WC full scale.

Static accuracy is ñ1% full scale in normal ambient temperature environments.

The units are temperature-compensated to less than ñ0.033% FS/§F of thermal error over the temperature range 0§F to 150§F.

Applications include variable air volume and fan control (VAV), environmental pollution control, static duct and clean room pressures, oven pressurisation and furnace draft controls and medical instrumentation.

The Setra 265 uses an improved all stainless steel sensor with a tensioned stainless steel diaphragm and an insulated stainless steel electrode, positioned close to the diaphragm, to form a variable capacitor.

Positive pressure moves the diaphragm toward the electrode, increasing the capacitance.

A decrease in pressure moves the diaphragm away from the electrode, decreasing the capacitance.

The change in capacitance is detected and converted to a linear DC electrical signal by a specially designed Setra electronic circuit.

The tensioned sensor also allows up to 10psi overpressure (in either direction) without damaging the unit.

In addition, the component parts of the sensor have thermally matched coefficients to ensure improved temperature performance and excellent long-term stability.

Internal regulation also allows use with unregulated DC power supplies.

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