DAS546633AA

T: +48 797 420 003 

E: sales.is@sgxsensortech.com www.sgxsensortech.com 

SGX Europe Sp. z o.o. Konduktorska 42 St., 40-155 Katowice, Poland 

## **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 detectionsystems Fordetectionof the following:** 

o **Combustible gases** (Catalytic Sensors) 

o **Light gase** s (e.g. hydrogenandhelium) (Thermal Conductivity Sensors) 

**LEL and % Volume Monitoring Diffused gas samplingvia sinter T hree thread options available Operational in varying temperature, pressure and humidity Fast response Ruggedstainless steel construction No moving parts Resistance to corrosion Low maintenance Accessories available for field applications ATEX** certified **UKCA** certified **CSA** certified (Canada andUS) 

## **Principle of 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 nonmetallic 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. 

## **General Data** 

## **Mechanical** 

|**Mechanical**|**Mechanical**|
|---|---|
|**Dimensions**|See outline on Page 4|
|**Body material**|Stainless Steel|
|**Weight**|435g|
|**Environmental**||
|**Ambient temperature range**<br>**for operation (ATEX, UKCA):**<br>**for operation (CSA):**<br>**storage:**|-20°C to +60°C<br>-20°C to +65°C<br>-20°C to +60°C|
|**Operational pressure range**|700hPa to 1300hPa|
|**Humidity range for operation**<br>**and storage**|0 to 100% RH<br>_(Non-condensing)_|
|**Gases Detected**|Combustible, Light Gases|
|**Electrical**||
|**DC supply to detectors**|See Configurations Table<br>on Page 2|
|**Typical power**|Refer to Pellistor Type<br>Datasheet|



DS-240-VQ600, Issue 2, 12-Mar-2024, Page 1/5 

© SGX Sensortech 2012-2024 

SGX Europe Sp. z o.o. T: +48 797 420 003 Konduktorska 42 St., 40-155 Katowice, E: sales.is@sgxsensortech.com Poland www.sgxsensortech.com 

## **Configurations** 

|**Base**<br>**Sensor**<br>**Type**|**Pellistor**<br>**Type**<br>**(See Note 1)**|**Operating**<br>**Voltage (V)**<br>**(See Note 3)**|**Typical**<br>**Current**<br>**(mA)**|**Type**|**Thread Code**<br>**(See Table Below)**|**Thread Code**<br>**(See Table Below)**|**Thread Code**<br>**(See Table Below)**|**Gas Types**|
|---|---|---|---|---|---|---|---|---|
||||||**1**|**2**|**3**||
|**601**|VQ1B|2|300|Catalytic|Yes|Yes|Yes|All Flammable<br>Gases|
|**603**|VQ3B|2.5|330|Catalytic|Yes|Yes|Not Available<br>(See Note 2)|All Flammable<br>Gases|
|**605M**|VQ5MB|2|175|Thermal<br>Conductivity|Yes|Not Available<br>(See Note 2)|Not Available<br>(See Note 2)|Light Gases<br>(e.g. H2, He2)|
|**606M**|VQ6MB|2|300|Thermal<br>Conductivity|Yes|Not Available<br>(See Note 2)|Yes|Light Gases<br>(e.g. H2, He2)|
|**621T**|VQ21TB|2|300|Catalytic|Yes|Yes|Yes|All Flammable<br>Gases|
|**621TS**|VQ21TSB|2|300|Catalytic|Yes|Not Available<br>(See Note 2)|Yes|All Flammable<br>Gases|
|**622T**|VQ22TB|2|175|Catalytic|Yes|Yes|Yes|All Flammable<br>Gases|
|**623**|VQ23TB|2.5|335|Catalytic|Yes|Not Available<br>(See Note 2)|Not Available<br>(See Note 2)|All Flammable<br>Gases|
|**625**|VQ25B|2|300|Catalytic|Yes|Yes|Yes|Most Flammable<br>Gases<br>(Not including Methane)|
|**631M**|VQ31MB|3.5|90|Thermal<br>Conductivity|Yes|Yes|Yes|Light Gases<br>(e.g. H2, He2)|
|**635M**|VQ35MB|4.2|55|Thermal<br>Conductivity|Yes|Yes|Yes|Light Gases<br>(e.g. H2, He2)|
|**641TS**|VQ41TSB|2|100|Catalytic|Yes|Not Available<br>(See Note 2)|Yes|Most Flammable<br>Gases<br>(Not including Methane)|



_**Note 1:** Refer to the datasheet for each Pellistor Type for more information._ _**Note 2:** If the desired Thread Type is listed as “Not Available” please contact SGX._ _**Note 3:** Thermal Conductivity sensors can be operated at voltages different to stated above depending upon target gas type._ 

## **Thread Codes** 

The sensing head is supplied with one of three different mounting threads at the user's choice (see outline on Page 4). 

|**Thread code**|**Thread**|**Dimension X (mm)**|
|---|---|---|
|1|Metric 20 x 1.5 mm|16.00|
|2|ANP (Taper) ½" - 14 NPT|19.85|
|3|ANP (Taper) ¾" - 14 NPT|20.16|



Taper threads are manufactured in accordance with ANSI/ASME B1.20.1. 

## **Operating Circuit** 

R1 = R3 = 500 to5000 , R2 R1/5 R2 provides zero adjustment andmaybeomittedif not required. 

DS-240-VQ600, Issue 2, 12-Mar-2024, Page 2/5 

© SGX Sensortech 2012-2024 

SGX Europe Sp. z o.o. T: +48 797 420 003 Konduktorska 42 St., 40-155 Katowice, E: sales.is@sgxsensortech.com Poland www.sgxsensortech.com 

## **Certification** 

||**ATEX / UKEX**|**CSA**|
|---|---|---|
|Certificate / File:|BAS01ATEX2110X<br>CSAE22UKEX1013X|2589678|
|Standards|EN IEC60079-0:2018<br>IEC60079-1:2014Ed.7|CSAC 22.2 No.30 (M 1986)<br>CSAC 22.2 No.142 (M 1987)<br>FM 3600 (Nov 1998)<br>FM 3615 (Feb 2006)|
|Product Marking|II2G Ex db IIC T5 Gb<br>CSAE 22UK EX1013X<br>&)|FM 3615 (Feb 2006)<br>Class I<br>Groups B,C & D|
|Manufacturing &<br>Certificate Address<br>a|SGX Europe sp. z o. o., 40-155 Katowice, 42 Konduktorska St., POLAND||



## **INSTRUCTIONS SPECIFIC TO HAZARDOUS AREA INSTALLATIONS** 

(Ref : EU ATEX Directive 2014/34/EU) 

1. The head is classified as flameproof equipment and is marked: 

BAS01ATEX2110X II 2G Ex db IIC T5 Gb Tamb = -20°C to +60°C 2W/5V MAX 

UKCA CSAE 22UKEX1013X 

The head should only be used within the limits imposed by this certification and by these conditions of use. 

2. The head may be used in a hazardous area without further mechanical protection. However, the cable requires mechanical protection and must be terminated in a suitable enclosure. 

3. The head must be efficiently earthed (grounded). This may be achieved by mounting it into an appropriate 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. 

4. In the event that the head becomes embedded in a junction box by over-tightening or corrosion, it may be released by the use of a spanner or wrench on the two flat surfaces on the sides of the body. 

5. There are no user serviceable parts inside the body of the sensing head, and no attempt should be made to open the body for any purpose. The unit is non-repairable. 

6. The head has not been assessed as a safety device (EHSR 1.5). 

7. When installed in outdoor locations where rain or spray could interfere with the safe working of the head, or in indoor locations where water jets, sprays, or hoses are used routinely for cleaning purposes, the head should be fitted with the Weather Cap that is available as an accessory. 

8. The end-user/installer should be aware that the certification of the head relies in its construction on the use of the following materials, which are suitable for most common applications: 

Enclosure ............................................................................................................................................... Stainless Steel Sinter ...................................................................................................................................................... Stainless Steel Bushing ....................................................................................................................................................... Epoxy resin 

In accordance with the Note in EN60079-0:2006 Clause 6.1, the end-user/installer shall inform the manufacturer of any adverse conditions that the head may encounter. This is to ensure that the head is not subject to conditions that may cause degradation of these materials. 

DS-240-VQ600, Issue 2, 12-Mar-2024, Page 3/5 

© SGX Sensortech 2012-2024 

SGX Europe Sp. z o.o. T: +48 797 420 003 Konduktorska 42 St., 40-155 Katowice, E: sales.is@sgxsensortech.com Poland www.sgxsensortech.com 

## **Outline (All dimensions in millimetres; dimensions without limits are nominal)** 

## **Terminal connections** 

|**Lead Colour**|**Element**|
|---|---|
|Blue|Detector|
|Red|Compensator|
|Yellow|Common|



## **Accessories (All dimensions in millimetres)** 

Three accessories are available to complement the VQ600 Series gas detection head. 

## **Flow Cap DAS546633AA** 

## **Weather Cap DAS546632AA** 

## **Quick Calibration Hood DPP546618DA** 

The Flow Cap allows the VQ600 to be used in applications where it is to be aspirated permanently with a pumped or pressurised sample. The cap is made of 316 stainless steel and can be used in a variety of applications involving pumped sampling analysis or detection systems. 

The Weather Cap protects the VQ600 from water when used in external locations, where rain or spray could interfere with the safe working of the head, or in internal locations where water jets, sprays or hoses are used routinely for cleaning purposes, etc. The cap is made of 316 stainless steel and has been tested to IP64 for effectiveness, and also to ensure that it does not significantly affect the VQ600's performance. 

The Quick Calibration Hood is constructed from polypropylene, and provides a convenient means of supplying test gases to the VQ600 in the field, for calibration and checking purposes. The assembly push-fits into the central gas access recess of the head, and is designed to accommodate 6 mm ID or ¼" flexible tubing. 

DS-240-VQ600, Issue 2, 12-Mar-2024, Page 4/5 

© SGX Sensortech 2012-2024 

SGX Europe Sp. z o.o. Konduktorska 42 St., 40-155 Katowice, Poland 

T: +48 797 420 003 E: sales.is@sgxsensortech.com www.sgxsensortech.com 

## **Ordering Information (VQ600)** 

Three accessories are available to complement the VQ600 Series gas detection head. 

## **VQbase/n** 

## **BASE SENSO R TYPE** 

Refer to Configurations Tableon Page 2 

## **THREAD CODE** 

Refer to ThreadCodes Tableon Page 2 

## **Examples** 

## **VQ621T/1** 

_VQ600 series head fitted with VQ21T B pellistor and supplied with 20 x 1.5 mm metric thread cap._ 

## **VQ603/2** 

_VQ600 series headfitted with VQ3B pellistor andsuppliedwith ½" - 14 NPT American National Pipe Taper thread._ 

## DISCLAIMER: 

SGX Europe Sp. z o.o. reserves the right to change design features and specificaDons without prior noDficaDon. We do not accept any legal responsibility for customer applicaDons of our sensors. SGX Europe Sp. z o.o. accepts no liability for any consequenDal losses, injury or damage resulDng from the use of this document, the informaDon contained within or from any omissions or errors herein. This document does not consDtute an offer for sale and the data contained is for guidance only and may not be taken as warranty. Any use of the given data must be assessed and determined by the user thereof to be in accordance with federal, state and local laws and regulaDons. All specificaDons outlined are subject to change without noDce. 

SGX Europe Sp. z o.o. sensors are designed to operate in a wide range of harsh environments and condiDons. However, it is important that exposure to high concentraDons of solvent vapours is to be avoided, both during storage, fiĜ ng into instruments and operaDon. When using sensors on printed circuit boards (PCBs), degreasing agents should be used prior to the sensor being fiĦed. SGX Europe Sp. z o.o. makes every effort to ensure the reliability of its products. Where life safety is a performance requirement of the product, we recommend that all sensors and instruments using these sensors are checked for response to gas before use. 

**Copyright© 2012-2024 SGX Sensortech All rights reserved.** 

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**No part of this publication maybe reproduced, distributed, or transmittedin any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the publisher, except in the case of brief quotations embodied in critical reviews and certain other non-commercial uses permitted by copyright law. For permission requests or technical support please contact or write to the publisher, addressed “Attention: Permissions Coordinator,”.** 

DS-240-VQ600, Issue 2, 12-Mar-2024, Page 5/5 

© SGX Sensortech 2012-2024