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TROX GmbH
Heinrich Trox Platz
47504 Neukirchen-Vluyn
Phone +49(0)2845-202-0
Fax +49(0)2845-202-265
http://www.trox.de
e-mail: trox@trox.de
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Installing and commissioning instructions
Velocity sensor VS-TRD
LABCONTROL system
MI/7.4/5/EN/2
Attention!
Before installing and commissioning
read this manual carefully!
Scope of application for VS-TRD
The velocity sensor VS-TRD measures the face velocity
of fume cupboards and gives an appropriate analog
output signal with 2-10 V DC.
In conjunction with TROX volume flow controllers based
on LABCONTROL EASYLAB, TCU-II or TCU-LON-II the
sensor is used for variable volume flow control.
Alternatively the VS-TRD can be also used in conjunction
with TROX LABCONTROL system TFM-2 for monitoring
the face velocity.
The sensor VS-TRD is placed for these functions at a
suitable position on the fume cupboard.
Please regard the assembling drafts on the following side.
Safety instructions
The installation and wiring must be carried out by
qualified and instructed personnel. The country and local
specific guidelines and regulations for electrical
installations must be observed.
During installation, wiring and commissioning, the
established technical regulations, are to be observed,
particulary those on safety and accident prevention.
Technical data
Power supply: 24 V AC ±15 %, 50/60 Hz
Temperature: 10 - 40°C
Output: 1 analog output 2-10 V DC
equivalent to 0 - 1 m/s
Protection class: IP 20
Connector: Phoenix MC 1.5/3-ST-3.81
br (br) = Power supply 24 V AC
ws (wt) = Power supply GND
gn (gn) = Analog output AO
Dimensions:
max. casing dimensions: 80 x 90 x 60 mm
max. installation depth: 88.1 mm
Wiring
The transducer is supplied with a prefabricated 3 m cable
ready-made for plug into the control systems. The green
3-pole Phoenix plug must be fitted in the corresponding
plug socket on the EASYLAB, TCU-II respectively
TCU-LON-II controller board. A cable extension with 5 m
length is optionally available.
(TROX -No. M536BA9)
Installing instructions
1. Accessibility for further maintenance work must be
regarded.
2. A hole of ∅ 21-22.5 mm diameter must be drilled in
the top of the fume cupboard.
3. The hole diameter must be observed accurately,
otherwise measuring errors may occur due to air flow
besides the transducer.
Positioning of the hole:
For positioning the hole please follow these instructions:
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TROX GmbH
Heinrich Trox Platz
47504 Neukirchen-Vluyn
Phone +49(0)2845-202-0
Fax +49(0)2845-202-265
http://www.trox.de
e-mail: trox@trox.de
2
Installing and commissioning instructions
Velocity sensor VS-TRD
LABCONTROL system
MI/7.4/5/EN/2
1. There must be enough mounting room for the
VS-TRD at the selected position.
2. Inside the fume cupboard the selected area must
have a constant air flow with non turbulent air.
(laminar airflow).
3. The VS-TRD should not be exposed to any air
streams outside the fume cupboard.
(e.g. installation beneath ceiling diffusers).
4. The VS-TRD should not be installed inside pressure
ceilings.
5. If a pressure difference between the area around the
transducer and the room can be recognized an
opening is required as big as necessary to avoid a
measurable airflow.
The best possible sensor position is shown in the
following pictures:
Insertion of the velocity sensor into the borehole:
1. The velocity sensor VS-TRD should only be inserted
into the borehole of the fume cupboard.
2. The sensor must not rest onto the fume cupboard.
3. Never exceed the given diameter of the borehole.
Attention:
Exceeding the diameter of the borehole will influence the
measuring negatively!
Optimal
mounting
position
Prohibited
mounting positions
Airtight connection of sensor duct and fume cupboard
Alternative mounting position
Opening size see
point 5 on the left side
Design changes reserved · All rights reserved © TROX GmbH (02/2010)
≥ 100 mm
Alternative
mounting positions
Optima
l
mounting
position
Pressure ceiling not
allowed!
Important:
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