00132417_0
Face velocity transducer Type VS-TRD


00132417_0

VS-TRD

For fume cupboard controllers EASYLAB and TCU-LON-II

Face velocity transducer for the variable, demand-based control of extract air flows in fume cupboards

  • Non-contact measurement of the face velocity, hence not subject to wear
  • For fume cupboards with vertical and horizontal sashes
  • Automatic detection of thermal loads
  • Simple installation into a drilled hole in the dome of the fume cupboard, also for multiple fume cupboards in a row
  • Plug-in cable
  • Measuring range 0 – 1 m/s


Additional application of the transducer

  • For monitoring the face velocity with monitoring devices FMS-2

Application

Application

  • Face velocity transducer Type VS-TRD for the LABCONTROL system
  • For the demand-based control of variable volume flows in fume cupboards
  • Connection to an EASYLAB controller TCU3, to a controller TCU-LON-II, or to monitoring system FMS-2
  • Consideration of all sashes of a fume cupboard
  • For fume cupboards with vertical and horizontal sashes, also for fume cupboards with sashes on two sides
  • Increased safety for people working in labs
  • For use in laboratories and in clean rooms in the pharmaceutical and semiconductor industries

Special characteristics

  • Demand-based fume cupboard control depending on the sash distance
  • Recording of the face velocity at vertical and horizontal sashes as well as for both sashes on a fume cupboard
  • Non-contact measurement of the face velocity, hence not subject to wear
  • Constant face velocity (typically 0.5 m/s) within the set volume flow rate range due to cascade control of face velocity and volume flow
  • Detection and safe dissipation of thermal loads due to automatic volume flow increase

Description

Parts and characteristics

  • Easy-to-install casing with sensor tube
  • Sensitive electronics with integral temperature compensation
  • Non-contact measurement of the face velocity using calorimetric principle; not subject to wear

Useful additions

  • CAB-TRD: 5 m plug-in extension cable for face velocity transducer VS-TRD
  • EasyConnect: Configuration software for the commissioning and diagnosis of EASYLAB components
  • MConnect: Configuration software for the commissioning and diagnosis of the Type TFM/TPM monitoring devices and TCU-LON-II

Construction features

  • Simple mounting to fume cupboards
  • Conical sensor tube to be inserted into a drilled hole 20 – 21 mm in the dome of the fume cupboard
  • Plug-in connecting cable 3 m

Materials and surfaces

  • Plastic casing, black

Standards and guidelines

  • Type certification: Volume flow control system for fume cupboards to EN 14175

Teknisk information

Function, Technical data, Specification text, Order code, Related products

  • Function
  • Technical data
  • Specification text
  • Order code
Sash closed. High face velocity
00131518_0


00131518_0
00131515_0
00115164_0.

Functional description

The face velocity is measured using a heated thermal resistor and based on the resistance change principle; it is a non-contact measurement and hence not subject to wear. The face velocity sensor is placed in a bypass opening where it measures the airflow. This airflow is equal to the face velocity of all sashes of the fume cupboard. The face velocity transducer can hence be used for both vertical and horizontal sashes.


VS-TRD for fume cupboard control

  • EASYLAB controller TCU3: Equipment function FH-VS
  • Controller TCU-LON-II: Equipment function FH


Since cascade control applies, the face velocity is kept constant based on the volume flow rate, which lies between the set minimum and maximum volume flow rates.

Opening the sash leads to a decrease of the face velocity. The fume cupboard controller raises the volume flow. Sufficient air transfer from the room to the fume cupboard is ensured (and work safety is maintained).

Closing the fume cupboard leads to a decrease of the volume flow such that the face velocity is kept constant. The minimum volume flow ensures sufficient ventilation of the fume cupboard.


VS-TRD for monitoring

  • Monitoring system FMS-2


The face velocity is monitored. If the face velocity is above or below a certain limit, an alarm is emitted on the control panel. Limits and the type of alarm can be configured.

Supply voltage

24 V AC/DC from the controller

Measuring range

0 – 1 m/s

Actual value signal output

2 – 10 V DC

Operating temperature

15 – 40 °C

IEC protection class

III (protective extra-low voltage)

Protection level

IP 20

EC conformity

EMC according to 2004/108/EC


Electronic transducer for the LABCONTROL system, used to measure the face velocity on fume cupboards.

Suitable for fume cupboards with vertical and horizontal sashes.

Non-contact measurement, not subject to wear.

A 2 – 10 V DC voltage signal that is proportional to the face velocity is emitted. If the sensor is connected to a fume cupboard controller, the volume flow is controlled based on demand. If the transducer is connected to a monitoring system, an alarm is emitted in case the face velocity is higher or lower than the set maximum and minimum values.

Simple mounting on the fume cupboard dome.

Special characteristics

  • Demand-based fume cupboard control depending on the sash distance
  • Recording of the face velocity at vertical and horizontal sashes as well as for both sashes on a fume cupboard
  • Non-contact measurement of the face velocity, hence not subject to wear
  • Constant face velocity (typically 0.5 m/s) within the set volume flow rate range due to cascade control of face velocity and volume flow
  • Detection and safe dissipation of thermal loads due to automatic volume flow increase

Materials and surfaces

  • Plastic casing, black

Technical data

  • Supply voltage> 24 V DC from the controller
  • Measuring range 0 – 1 m/s
  • Output: Actual value signal: 2 – 10 V
  • Protection level: IP 20

00134765_0

00134765_0
00134361_0

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

 

Dimensions

  • Dimensions
VS-TRD 00114913_0.
① 3 m connecting cable
② Diameter for drilled hole in the fume cupboard dome 20 – 21 mm


Installation details

  • Installation details
Measurement location of the face velocity transducer (FH-VS, FH) 00131525_0
① Spigot, for example to connect a VAV terminal unit Type TVLK
② Dome of the fume cupboard
③ Possible installation position of the VS-TRD


Installation and commissioning

  • Not to be installed near a ceiling diffuser
  • Not to be installed in pressurised ceiling voids
  • Access must be ensured
  • EASYLAB controller TCU3: The controller automatically recognises the face velocity transducer (equipment function FH-VS)
  • Controller TCU-LON-II: The controller automatically recognises the face velocity transducer (equipment function FH)
  • Monitoring system FMS-2: Integrate the face velocity transducer using the MConnect configuration software
  • If necessary, make project-specific adjustments using the configuration software

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