Table of Contents
Advertisement
Quick Links
TQ Environmental Ltd.
ATEX
OPERATING MANUAL
© TQ Environmental Ltd.
This manual must not be copied or reproduced in part without the express written
permission of TQ Environmental Ltd. All information contained herein is subject to
modification.
TQ Environmental Ltd,
Tel: +44 (0) 1924 271013
5812M16
th
Issue 16:
17
Feb 2022
TQ122
GAS SENSOR HEAD
TQ ENVIRONMENTAL Ltd BS EN ISO 9001
Silkwood Court,
Wakefield,
West Yorkshire,
WF5 9TP.
United Kingdom
Email: sales@tqenv.com
Web:
www.tqenv.com
Page 1 of 22
Advertisement
Table of Contents
Related Manuals for TQ Environmental TQ122
Summary of Contents for TQ Environmental TQ122
- Page 1 OPERATING MANUAL © TQ Environmental Ltd. This manual must not be copied or reproduced in part without the express written permission of TQ Environmental Ltd. All information contained herein is subject to modification. TQ ENVIRONMENTAL Ltd BS EN ISO 9001...
-
Page 2: Table Of Contents
TQ Environmental Ltd. CONTENTS Page no: Proprietary Warning, Cautions and Notes Safety Warnings Limit of Application of Operating Manual Section 1 Description 1.1 General Description 1.2 Method of Detection 1.3 Sensor Unit Description 1.4 Gases Monitored 1.5 Performance Specifications 1.6 Cross Sensitivity 1.7 Performance Tests... -
Page 3: Proprietary
TQ Environmental LTD does not assume any liability arising out of the application or any use of any product or circuit described herein;... -
Page 4: Safety Warnings
TQ Environmental Ltd. SAFETY WARNINGS • TO MAINTAIN THE HAZARDOUS AREA CERTIFICATION FOR THE TQ122 GAS SENSOR, IT MUST BE SCREWED INTO A SUITABLY CERTIFIED JUNCTION BOX TO ALLOW CONNECTION TO THE ASSOCIATED CONTROL/DISPLAY UNIT. NEITHER THE COVER OF THE TQ122 NOR THE ENCLOSURE INTO... -
Page 5: General Description
This technical manual covers the use of the TQ122 Sensor as a diffusion type sensor. A suitable device may be connected to the sensor to allow its use in flow through applications. -
Page 6: Gases Monitored
FIGURE 1.---GENERAL OVERVIEW GASES MONITORED. A number of different types of sensing elements may be fitted to the TQ122 Gas Sensor depending upon the gas being monitored and the composition of the background gas present. Table 1 details the sensors available. The measurement of toxic gases and oxygen are 4-20mA based sensors (electrochemical cells) whilst, in the flammable gas sensors, the gas is burnt catalytically in the presence of air (pellistors). - Page 7 TQ Environmental Ltd. Table 1. TQ122 Sensor Ranges TQ PART NO GAS/VAPOUR RANGE 0 – 25 %volume 122-001 Oxygen Toxic Gases 0 – 1000 ppm 122-002 Carbon Monoxide 0 – 50 ppm 122-003 Hydrogen Sulphide 0 – 20 ppm 122-004 Sulphur Dioxide 0 –...
-
Page 8: Performance Specifications
TQ Environmental Ltd. PERFORMANCE SPECIFICATIONS. The performance of the TQ122 will depend upon the gas being monitored and the background gas composition. Table 2. TQ122 Sensor Performance Specifications. FACTOR SPECIFICATION Detection Method: Electrochemical, pellistor or similar cell Sampling Method: Continuous Diffusion (option of flow through cell) -
Page 9: Cross Sensitivity
Pellistors show a general response to most combustible gases. Table 4 shows a typical response for the TQ122-210 sensor to % LEL concentrations of various gases where the sensor has been previously calibrated with 100% LEL methane. Pellistors may be subject to poisoning in some applications. Common gases and vapours which should be avoided include silicones and hydrogen sulphide. -
Page 10: Performance Tests
100% LEL Hydrogen PERFORMANCE TESTS The performance of the TQ122-210 in conjunction with a TQ series 8000 control unit has been tested against the relevant parts of BS EN 61779-1 and BS EN 61779-4. A copy of the test results is available from TQ Environmental LTD. -
Page 11: Mechanical Installation
It is important to ensure the connection between the TQ122 and the junction box is watertight. • The only method of mounting the TQ122 is through the M20 thread on the top of the unit. ELECTRICAL INSTALLATION. Figure 2 shows the installation of a 2-wire TQ122. Table 5 shows the connections of a pellistor based sensor. -
Page 12: Cabling
SUPPLY (1.5w Power Limited) TQ122 Yellow DISPLAY / CONTROL UNIT Load Resistor Figure 2 -- Wiring of Two Wire TQ122 Table 5. Connections to Pellistor Based Sensors (TQ122-210, TQ122-211, TQ122-212, TQ122-215) Cable Colour +2v Power Supply Blue Signal Out Green Cabling. - Page 13 Individual cores should be 1.5mm , type 7/0.53. For the TQ122-210, 122-211, 122-212 & 122-215 sensors it is essential that the resistance of each conductor does not exceed 3 ohm. Figure 3 shows an installation where the sensor and control unit are separated by K metres.
- Page 14 (SWA) cable when connecting to the power source and Control/Display Unit. CAUTION Please contact TQ Environmental Ltd if there is any doubt concerning the wiring of the TQ122 or its operation in a hazardous environment. 5812M16 Issue 16: Feb 2022...
-
Page 15: Commissioning
TQ Environmental Ltd. SECTION 3 - COMMISSIONING & CALIBRATION COMMISSIONING. Prior to connecting power to the TQ122 Sensor, the following preliminary checks should be made. a. Ensure the Sensor is screwed tightly into its junction box. b. Check that the Sensor is correctly wired. -
Page 16: Calibration
TQ Environmental Ltd. CALIBRATION. The TQ122 is factory calibrated for the gas and range as engraved on the body of the sensor. User adjustment of the instrument or output signal is not possible. Instead any calibration adjustments (zero and span) of the displayed value should be carried out on the associated Monitoring Equipment or Control Unit attached to the TQ122. -
Page 17: Routine Maintenance
End of Life and the sensor should be replaced. WARRANTY When the TQ122 Gas Sensor is operated in accordance with conditions described in this Manual the Standard Warranty is the shelf life detailed in Table 2. -
Page 18: Certification
Installations in hazardous areas are covered by certificate number:- SIRA 03ATEX1304X SPECIAL CONDITIONS FOR SAFE USE The TQ122 gas sensor shall not be used as a safety related device as defined in ATEX Directive 2014/34/EU. The TQ122 gas sensor shall be connected to an enclosure that has been suitable certified by a notified body and provides:- •... - Page 19 TQ Environmental Ltd DECLARATION REGARDING DIRECTIVE 2014/34/EU This declaration confirms that the TQ122 Gas Sensor has been designed and constructed in accordance with good engineering practice and is suitable for use in foreseeable indoor and outdoor industrial environments. TQ Environmental Ltd attests to the following: ▪...
-
Page 20: Addendum I Duct Mounting Kit
DUCT MOUNTING KIT Pt No 122-019 GENERAL DESCRIPTION The TQ122 series may also be supplied with a kit which will allow the TQ122 gas detector to be fitted in a constant velocity, low pressure air duct and provide a means of calibrating or checking the calibration in situ. - Page 21 COMMISSIONING The TQ122 duct mounted sensor is commissioned in the same way as section 3.1 in this Manual. However extra attention will require ensuring the duct mounted plate has maintained a good air tight seal with the duct wall.
- Page 22 TQ Environmental Ltd. To make sure the calibration gas when injected is not diluted by flowing gas inside the measurement cell. Under these static flow conditions the calibration gas will swamp the cell allowing accurate calibration to be established. CAUTION CALIBRATION WHILST GAS IS FLOWING THROUGH THE DUCT.
Need help?
Do you have a question about the TQ122 and is the answer not in the manual?
Questions and answers