___________________________________________________________________________________________
Whilst SGX has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also
reserves the right to change the specification of goods without notice. SGX accepts no liability beyond the set out in its standard conditions of sale in respect of
infringement of third party patents arising from the use of SGX products in accordance with information contained herein.
In case of modification of the product, SGX disclaims all liability.
SGX Europe sp .z o.o. Poland REGON: 362332227 DS-0240, Issue 1, 16-May-2016, Page 1
SGX Europe Sp. z o.o.
Building 11
Ligocka St. 103,
40-568 Katowice,
Poland
T: +48 (0) 32 438 4778
E: sales.is@sgxsensortech.com
www.sgxsensortech.com
VQ600 Datasheet
Pellistor Gas Sensor for Hazardous Areas
(Fixed Systems)
The VQ600 Series is designed to detect and monitor various
gases in the range 0 to 100% LEL for combustible gases and
0 to 100% volume in thermal conductivity mode when using
the SGX range of pellistor gas sensors.
The VQ600 Series is designed for use as an integral part of a
fixed gas detection system. The head comprises a stainless
steel flameproof enclosure constructed with an integral
stainless steel sinter which allows the safe entry of the
atmosphere being tested.
There are three types of mounting thread available to allow
easy fixing to the junction box of the fixed system and the
facility to attach accessories to the sensor via an external M46
thread.
FEATURES
Designed for fixed gas detection systems
For detection of the following:
o Combustible gases
(Catalytic Sensors)
o Light gases (e.g. hydrogen and helium).
(Thermal Conductivity Sensors)
LEL and % Volume Monitoring
Diffused gas sampling via sinter
Three thread options available
Operational in varying temperature, pressure and
humidity
Fast response
Rugged stainless steel construction
No moving parts
Resistance to corrosion
Low maintenance
Accessories available for field applications
ATEX certified
CSA certified (Canada and US)
OPERATION
The pellistor used in the head should be operated in the
manner recommended in the appropriate data sheet. In
general it is recommended that the detector and compensator
be run in a Wheatstone Bridge circuit so that a difference
signal may be obtained. A suitable circuit is shown in Fig. 1.
In use, the bridge supply voltage should not be allowed to
vary by more than the specified +0.1 V, or the output in clean
air may change in sympathy.
The head must be mounted so that the cable is protected.
This is normally achieved by mounting it into a port in a
suitable junction box.
Although SGX generally recommends that pellistors should be
run with a constant voltage supply to the bridge, it is possible
to use a constant current supply provided that the voltage
across the bridge in clean air remains within the
recommended limits.
It is essential that the head be efficiently earthed (grounded).
This may be achieved by mounting it either into an earthed
metal junction box, or into a non-metallic junction box fitted
with an earth continuity plate used in accordance with the box
manufacturer's instructions. There are no internal connections
to the sensing head body.
TECHNICAL SPECIFICATION
Mechanical
Environmental
Ambient temperature range
for operation (ATEX):
for operation (CSA):
storage:
-20°C to +60°C
-20°C to +65°C
-20°C to +60°C
Operational pressure range
Humidity range for operation
and storage
0 to 100% RH
(Non-condensing)
Electrical
See Configurations
Table on Page 2
Refer to Pellistor Type
Datasheet
