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gazex DEX/P Series User Manual

Concentration-measuring gas detector with explosion-proof construction, with 4-20 ma output, with an interchangeable catalytic, electrochemical or infra-red optical sensor
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Warsaw
Read the USER MANUAL in its entirety
BEFORE installation.
To ensure safety during installation and
operation of the detector, it is essential
to comply with the
recommendations
and warnings in this Manual
bearing this symbol.
Proceed only if you have fully understood this
Manual.
Keep this Manual for reference by the User of the gas
detection system.
1.
Purpose and choice of models
2.
Technical parameters
3.
Description / Order picking
4.
Installation conditions
5.
Installation
6.
Maintenance / operation
6.2.2 Sensor module replacement
7.
Warranty terms and conditions
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 'gazex' name, as well as 'dex', 'Aktywny System Bezpieczeństwa Instalacji Gazowej' [Active Gas Installation Safety System],
User Manual: DEX/P detector, version 9PU2
USER
MANUAL
edition 9PU2
Work and Live SAFER with Us!
D
E
D
E
CONCENTRATION-MEASURING GAS DETECTOR
-
WITH EXPLOSION
PROOF CONSTRUCTION
with an interchangeable
catalytic, electrochemical
Infra-Red optical SENSOR
DEX-PnK/N, DEX-PnKL/N,
models:
DEX-PnE/N, DEX-PnR/N
[U2] series from 2021
ASBIG, are registered trademarks of GAZEX company.
©gazex ' 2024 v2406
X
X
/
P
/
P
®
®
,
4-20 mA
WITH
output,
or
p. 3
8
11
12
14
19
21
23
24
p. 1 / 24
©gazex

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Summary of Contents for gazex DEX/P Series

  • Page 1 ©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 ‘gazex’ name, as well as ‘dex’, ‘Aktywny System Bezpieczeństwa Instalacji Gazowej’ [Active Gas Installation Safety System], ASBIG, are registered trademarks of GAZEX company.
  • Page 2 P4-HT-CM, P6-B, P6-BM, P6-C, P6-CM; hereinafter ‘DEX’ or ‘detector’; DEX-PnK(L)/N – concentration-measuring detector with a catalytic sensor – models DEX-PnK/N or DEX- PnKL/N, where ‘n’ is the digit representing the calibration gas code according to GAZEX nomenclature; MDP – measuring alarm modules manufactured by GAZEX, type MDP-(1, 4, 8, 16)...;...

  • Page 3: Intended Use

    They feature an analogue current output in the 4-20 mA standard (passive – current sinking). These detectors are intended for use with MDP... type alarm modules manufactured by GAZEX. They can also be used with other control panels that accept the 4-20 mA input line standard (current emitting) when used with the optional MDPL1 power limiter.
  • Page 4 CONTROL OUTPUTS (12VDC) (24VDC) INPUT for cascading system expansion equipotential bonding point in the Ex zone Block diagram of DEX/P connections with an external gas detection system User Manual: DEX/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 4 / 24...
  • Page 5 JP-4 (jet fuel) {1.39} The data for Table 1.2.PnK were sourced from materials provided by the catalytic sensor manufacturer. GAZEX assumes no responsibility for the reliability of the above data (updated on 19 July 2007). Coefficients for other media (if provided by the manufacturer) are available at GAZEX.
  • Page 6 9E5/N is recommended! 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 7 W – concentrations considered high in metrological practice; SL – selectivity as per Figure 1.2.PnR 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: Technical Parameters

    Ex db IIC T4 Gb for P4-C, P4-CM, P4-S-C, P4-S-CM, P4-HT-C, P4-HT-CM versions KDB 04ATEX133X with Supplementary Certificates Ex detector certificate Standard Gazex 3-Year Plus Warranty (SGG3Y+) covering the period until the end of the year in which the device was manufactured and the following 3 years Warranty (year of manufacture indicated on the nameplate =>...
  • Page 9 Storage conditions -20°C to +25°C. After a period of 6 months from the production date, calibration is required (does not apply to DEX-P9E5/N). User Manual: DEX/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 9 / 24...
  • Page 10 DEX-P8R/N model – carbon dioxide (CO Detectable gases Selected typical cyclohexanol, acetic acid, chloromethane, methyl formate, chloroethanol, chemical compounds nitroethane, ethylene oxide, furan, for others = contact GAZEX; with minimal impact on (does not apply to DEX-P8R/N model). the sensor Typical chemical...
  • Page 11 – 1 pc.  detector operating manual (may be included with the manual for  the MDP-type control module) and available at www.gazex.pl . 3.1. V IEW WITHOUT COVER DEX/F nameplate Example of DEX Designation...

  • Page 12: Installation Conditions

    ACCESSED and there is free space of at least 15 cm below the  sensor shield (for future servicing). User Manual: DEX/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 12 / 24...
  • Page 13 The document must be retained and it is essential to pass it on to the detector/system user, as it forms the basis for dealing with any claims or calibration procedure. ©gazex ’ 2024 v2406 User Manual: DEX/P detector, version 9PU2...

  • Page 14: Installation Positions

    M5 screw that secures the detector. When installing DEX in an area where no explosion hazard zone has been designated, earthing the detector’s enclosure is not required. User Manual: DEX/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 14 / 24...
  • Page 15 9.3.3 of the PN-EN 60079-14:2014- . As this requirement is not precise in the standard, GAZEX recommends the use of 06 standard flexible 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 In an explosion hazard zone, only use cable conduits made of earthed metal pipes or plastics that do not accumulate electrostatic charges, or long elements made of any plastic, provided the projection does not exceed 25 mm. User Manual: DEX/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 16 / 24...
  • Page 17 Under normal conditions, the above start-up sequence is ‘unnoticed’ by the MDP – the detector’s readings are masked during the warm-up period for the first minute (the default setting in GAZEX control modules). When connecting DEX/P to third-party systems, the operation of the above start-up sequence should be taken into account.
  • Page 18 The date and name of the person performing the installation, along with the serial numbers of all detectors installed in the system, must be recorded in the Periodic Inspection Record attached to the MDP (or available at www.gazex.pl). The individual short calibration certificate should be stored with the Record.

  • Page 19: Maintenance / Operation

    In the constant presence of highly reducing gases, it may be necessary to periodically replace the sensor module. This is a paid service provided by the manufacturer! ©gazex ’ 2024 v2406 User Manual: DEX/P detector, version 9PU2 p. 19 / 24...
  • Page 20 If the above procedure does not significantly improve permeability, the cover should be replaced with a NEW one, supplied 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/P detector, version 9PU2 ©gazex ’ 2024 v2406 p. 20 / 24...
  • Page 21 1.1.B. column 6, in a gas-tight polyethylene bag. Storage temperature: -20°C to +30°C. The sensor module should be calibrated every 6 months calculated from the date of manufacture. ©gazex ’ 2024 v2406 User Manual: DEX/P detector, version 9PU2 p. 21 / 24...
  • 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: Warranty Terms And Conditions

    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 NEW or recalibrated For possible For possible sensor module replacement: new replacement: gasket for SPECIALISED TC-DEX ( supplier: GAZEX sensor shield with detector cover TOOLS/MATERIALS test gas cylinder with calibration set CS porous sinter REQUIRED FOR regulator and flow meter...

This manual is also suitable for:

Dex-pnk/nDex-pnkl/nDex-pne/nDex-pnr/n

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