gazex DEX/F User Manual

Two-threshold gas detector

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BEFORE installing, read the USER MANUAL

in its entirety.

To ensure safety during

installation and operation of the detector,

comply with the recommendations

and warnings in this User Manual

bearing this symbol.

Proceed only if you have fully understood of this Manual.

Keep this Manual for reference by the User of the gas

detection system.

Purpose

Technical parameters

Detector description / Order picking

Installation conditions

DEX installation

Maintenance / operation

6.2.2 Sensor module replacement

Warranty terms and conditions

DEX/F maintenance SCHEDULE

Work and Live SAFER with Us!

User Manual: DEX/F Detector all models – ed. 1allFU1

USER

MANUAL

edition 1allFU1

The 'GAZEX' logo and the names 'gazex', 'dex', and ASBIG are registered trademarks of GAZEX company.

TWO-THRESHOLD GAS DETECTOR

EXPLOSION

with an INTERCHANGEABLE SENSOR

DEX-nn/N, DEX-nE/N,

models:

DEX-nK(L)/N, DEX-nR/N

[U1] series

PROOF

p. 3

©gazex

Page 1 / 24

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Summary of Contents for gazex DEX/F

Page 1 Warranty terms and conditions DEX/F maintenance SCHEDULE ©gazex’2024. All rights reserved. Reproduction or copying, in whole or in part, without the permission of GAZEX is prohibited. The ‘GAZEX’ logo and the names ‘gazex’, ‘dex’, and ASBIG are registered trademarks of GAZEX company.
Page 2 TC-DEX – cap for delivering test gases to the DEX detector enclosure – can be used when the detector is placed in IIA or IIB gas-hazardous zone; MD – two-threshold alarm modules manufactured by GAZEX, types MD-(1, 2, 4)… or measuring modules MDP-(4, 8, 16)…;...
Page 3 ‘n’ is for digits comprising the code of the sensor module (calibration gas). MS sensor modules for DEX-nn, DEX-nn/N, DEX-nE/N, DEX-nK/N, DEX-nKL/N, DEX-nR and DEX-nR/N are interchangeable, i.e. different modules can be used for the same DEX/F body (except for DEX-nn.K detectors).
Page 4 (values for individual substances in accordance with PN–EN 60079-20-1:2010). NOTE: Detecting media in other ranges or different media is possible = special version, requires consultation with GAZEX; in particular cases, it is possible to tailor detector parameters to a specific application = ANALYSIS OF OPERATING CONDITIONS IS REQUIRED.
Page 5 The data for Tables 1.1.nE and 1.2.nE were sourced from materials provided by electrochemical sensor manufacturers (updated November 2023). GAZEX assumes no responsibility for the reliability of the above data. NOTE: When selecting a detector for a specific Customer application, GAZEX may use sensors with different parameters than those listed above.
Page 6 (updated July 2007). Coefficients for other media (if provided by the manufacturer) are available at GAZEX. The above coefficients should be regarded as approximate; they may differ from the actual values for a given sensor and may change over the course of operation.
Page 7 SL – selectivity as per Figure 1.2.nR Detecting other media or in other ranges is possible = special version, requires consultation with GAZEX; in particular cases, it is possible to tailor detector parameters to a specific application = ANALYSIS OF OPERATING CONDITIONS IS REQUIRED.
Page 8 F4-C,F4-CM,F4-S-C,F4-S-CM,F4-HT-C,F4-HT-CM versions KDB 04ATEX133X Ex detector certificate Standard Gazex 3-Year Plus Warranty (SGG3Y+) covering the period until the Warranty end of the year in which the device was manufactured and the following 3 years (year of manufacture indicated on the nameplate => no warranty cards required);...
Page 9 -20°C to +25°C. Calibration is required after 6 months from the production date (does not Storage conditions apply to DEX-9E5/N). User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 9 / 24...
Page 10 (especially those containing silicones Storage and derivatives), in a tightly sealed polyethylene bag; in a location free from vibrations and strong shocks; storage temperature: -20°C to +50°C User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 10 / 24...
Page 11 – 1 pc.  detector operating manual (may be included with the  manual for the MD-type control module) Fig. 3.1. View without cover User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 11 / 24...
Page 12 (selection indicated by a dot generation) (model determinant: DEX-12/N) or typed number) Fig. 3.3. BEFORE unscrewing the cover ==► Fig. 3.2. DEX/F components: unscrew the LOCKING screw: User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 12 / 24...
Page 13  as close as possible to the workplace but always within the incoming air stream from the potential toxic  gas emission source. User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 13 / 24...
Page 14 – in this position, thermal compensation may not function correctly. INSTALLATION POSITIONS: or conditionally permitted* – horizontal RECOMMENDED – vertical NOT PERMITTED: * – not recommended for DEX-nK/N with catalytic sensor User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 14 / 24...
Page 15 9.3.3 of the PN-EN 60079-14:2014-06 . As this requirement is not precise in the standard, GAZEX recommends the use of flexible standard control cables with polyvinyl chloride (PVC) or similar plastic insulation, designed by the manufacturer for industrial applications, for permanent installation, including outdoors and directly in the ground, with a rated voltage of 0.6/1 kV.
Page 16 DEX cable gland. The cable should also be additionally secured to a fixed surface close to the DEX cable gland, i.e., not more than 30 cm from the end of the gland. The purpose is to fix the cable in User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406...
Page 17 ‘Ex’ junction box with at least four terminals (available from GAZEX). The cable connecting the junction box to the control module should then meet the requirements listed in section 5.1.1.1: a) with an outer diameter selected for the cable gland used in the junction box, b) with core cross-sections appropriate for the terminals in the junction box, d), e), g), h).
Page 18 Note: DEX-9E5/N is sensitive even to brief power interruptions and may overestimate oxygen concentration readings after such an event—returning to normal operation may take up to 2 hours. User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406...
Page 19 3 years of detector operation. User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 19 / 24...
Page 20 ONLY by the Manufacturer!!! In cases of contamination with oil or lacquers, the cylindrical cover should be replaced with a new one. User Manual: DEX/F Detector all models – ed. 1allFU1 ©gazex ’2024 v2406 Page 20 / 24...
Page 21 ® 6.4. STORAGE OF DEX DEX/F detectors should be stored in a place free from vibrations, moisture, dust, exhaust fumes, free of any chemically active substances (especially those containing silicones and derivatives), in a tightly sealed polythene bag.
Page 22 GAZEX reserves the right to make minor changes to the technical specifications of the products supplied, while such changes and not included in this User Manual, and to modify the latter.
Page 23 SGG3Y+ available at www.gazex.pl. Selected extracts from the SGG3Y+ terms and conditions: … 1. GAZEX guarantees the efficient operation of devices of its own manufacture for the period up to the end of the year in which the device was manufactured and for another three years.
Page 24 DEX/F Detector – Recommended for Normal Operating Conditions MAINTENANCE SCHEDULE v2406 INSPECTION INSPECTION OF INSPECTION OF OPERATIONAL GAS SENSOR MAINTENANCE OF SENSOR COVER DETECTOR BODY ACTIVITY CHECK CALIBRATION THREADED PERMEABILITY SEALING CONNECTIONS Sensor shield with Threads on detector Cable gland...

This manual is also suitable for:

Dex-12/n Dex-14/n Dex-14/n-s Dex-15/n Dex-22/nl Dex-31/n ... Show all