Critical Environment Technology (CET) is a range of reliable air volume flow controllers and supplementary components for the secure, precise and fast measurement, control and monitoring of air volume flows and room pressures in buildings. CET can be easily integrated into building automation systems. The overall system thus provides maximum efficiency, cost effectiveness and security.

CET was designed for:

  • Room ventilation and general extractions
  • Room pressure control
  • Laboratory fume hood control
  • Room air conditioning

CET is suitable for the following areas of application:

  • Chemistry laboratories
  • Clean rooms
  • Laboratory rooms
  • Operating theatres
  • Sickrooms
  • Production rooms
  • Storage rooms
  • Laboratory fume hoods
  • Canopy hoods and extractions

Pressurized room and fume hood automation stations

The DXR2.E17C and DXR2.E17CX room automation stations are perfectly suited for buildings requiring room pressurization and fume hood control. They measure room pressurization, ventilation, and control supply airflow to the room and extract airflow from the room.

The room control application types for the DXR2.E17C automation station (30 data points) contain the controls for one segment. The room control application types for the DXR2.E17CX automation station (60 data points) contain the controls for two segments.

The room pressurization application types in either room automation station can coordinate multiple segments contained in other controllers and coordinate up to 8 fume hoods in one room.

The fume hood control application type for the DXR2.E17C automation station and the fume hood application type for the DXR2.E17CX automation station contain the control for one segment.

Figure: DXR2.E17C... room automation station

Airflow pressure sensor

The airflow pressure sensor (APS) is used to measure airflow for room pressurization and fume hood control applications.

Figure: APS DXA.S04P1

Figure: APS DXA.S04P1 with IP54 Cover

Differential pressure sensor

The differential pressure sensor acquires differential, over- and under-pressure of air and nonaggressive gases if a high degree of measuring accuracy and quality is required.

It is also suited for measuring volume flow via differential pressure since the output signal can be set to basic fume hood.

Figure: QBM3020…

Flow sensor

The flow sensor is suited for accurate and long-term stable recording of the air face velocity of fume hoods with horizontal and vertical sliding front doors.

Figure: QVE3001

Cable sash sensor

The cable sash sensor is a field device to acquire the sash position of a laboratory fume hood for Siemens laboratory fume hood controllers. The cable sash sensors are compact, economical and water-resistant devices with flexible cables, spring-loaded spools and a potentiometer to detect and measure the linear position. The cable sensor measures a fume hood’s sash opening. The sensor unit consists of a string with hook, roll, spring and potentiometer. The roll is inserted and attached to the potentiometer shaft. The cable is wound on this roll and is unwound against the spring force. The full length of the cable is proportional to the potentiometer's resistance.

Figure: DXA.B130

Fume hood operating display panels

The Operating Display Panel (QMX3.P87) is the interface between the fume hood operator and the control system. It includes a custom-designed package for visual and audible indication of fume hood operating conditions and push-buttons for emergency mode operation, alarm silence and user-defined auxiliary buttons. The panel is mounted on the wall or fume hood in an easily accessible location. Up to two operating display panels are supported per fume hood controller.

Figure: QMX3.P87-1WSC

The Operating Display Panel (QMX3.P88) includes a custom-designed package for visual and audible indication of fume hood operating conditions and push-buttons for fume hood setpoint operation, alarm silence and a schedule override function. The panel is mounted on the fume hood in an easily accessible location. Two operating display panels are supported per fume hood controller.

Figure: QMX3.P88-1WSC

Fast running actuators for air dampers

Electronic actuator for 2-position, 3-position, or modulating control, nominal torque 6 Nm, at 2 s running time, self-centering shaft adapter, range mechanically adjustable between 0...90°, prewired with 0.9 m long standard connection cables.

Figure: GAP191.1E