Functional description

The sash distance is recorded with a draw wire that is linked to the sash movement. The output signal is proportional to the sash distance. The sensor can be used only with vertical sashes.

DS-TRD for fume cupboard control – linear control strategy

• EASYLAB controller TCU3: Equipment function FH-DS

• Variable volume flow control based on the measured sash distance
• Volume flow rate is linear to the sash position: OPEN corresponds to V_max, CLOSED corresponds to V_min
• Sash opening can be monitored according to EN 14175, without additional switch contact

DS-TRD for fume cupboard control – safety-optimised control strategy

• EASYLAB controller TCU3: Equipment function FH-DV

• Safety-optimised volume flow control based on the measured sash distance
• The volume flow rate is linear to the sash distance; the aim is to maintain a constant safe face velocity (0.5 m/s) even if the sash is fairly wide open
• Sash opening can be monitored according to EN 14175, without additional switch contact

• Any attachments are to be defined with the order code of the VAV terminal unit.
• Retrofit possible

Installation and commissioning

• Fix the sash distance sensor to the fume cupboard
• Link the measuring wire to the sash movement, e.g. by fixing it to the balance weight of the sash
• The measuring wire can be drawn vertically or horizontally.
• Measuring range 0 – 1750 mm or 350 – 2100 mm
• The controller automatically recognises the sash distance sensor
• Project-specific adjustments can be made, and the maximum operational sash opening can be entered using the EasyConnect configuration software