Siemens 125-5033 Manuale d'uso - Pagina 18

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Fume Hood Controller Owner's Manual

NOTE:

Differential Pressure Transmitter

The differential pressure transmitter is used to send a signal that represents the velocity of air

in the duct to the controller. The differential pressure transmitter receives the velocity

pressure signal from the airflow sensor (orifice plate). The transmitter is a dead-end device

which prevents the exhausted fume hood air from flowing through the transmitter or the

sensor.

NOTE:

Airflow sensors are used in conjunction with the differential pressure transmitter. The airflow

sensor senses an average air velocity across the duct section. Using the average air velocity

and the duct area, the controller calculates the airflow.

CAUTION:

Ensure that the sensor and exhaust system materials match the fume hood usage.

Exhausting corrosive fumes may corrode the sensor and exhaust system.

The Fume Hood Controller connects to the portable operator's terminal with the controller

interface cable (P/N 540-143). This cable has an RJ-11 connector (similar to a phone jack)

on one end, and a larger, 9-pin connector on the other end. The RJ-11 connector plugs into

the bottom of the ODP. For more information, see the Fume Hood Controller Operator

Display Panel User's Card (125-1976). The 9-pin connector plugs in the communication port

of the portable operator's terminal. For more cable information, contact your local Siemens

Building Technologies, Inc. representative.

While the pneumatic actuator is being commanded, you may hear a hissing or

clicking sound coming from the AO-P module. This is due to the movement of the

air valves and the bleeding of air from the actuator. This is normal operation.

In accordance with laboratory ventilation safety standards and regulatory

agencies, the performance of the fume hood should be checked annually, as a

minimum, to ensure continued safe and proper operation. Consult Siemens

Building Technologies for more information about a comprehensive laboratory

ventilation system evaluation and associated test programs.

Siemens Building Technologies, Inc.