CERTIFICATE(1)

EU-Type Examination(2)

Equipment or protective systems intended for use inpotentially explosive atmospheres - Directive
2014/34/EU(3)

EU-Type Examination Certificate Number: DEKRA 17ATEX0103X(4)

Product:

Portable Gas Monitor Models GX-3R and GX-3R Pro(5)

Manufacturer:

RIKEN KEIKI Co., Ltd.

(6)

Address:

2-7-6, Azusawa, Itabashi-ku, Tokyo, 174-8744, Japan(7)

This product and any acceptable variation thereto is specified in the schedule to this certificate and the documents
therein referred to.

(8)

DEKRA Certification B.V., Notified Body number 0344 in accordance with Article 17 of Directive 2014/34/EU of theEuropean Parliament and of the Council, dated 26 February 2014, certifies that this product has been found tocomply with the Essential Health and Safety Requirements relating to the design and construction of products
intended for use in potentially explosive atmospheres given in Annex II to the Directive.

Issue Number: 5The examination and test results are recorded in confidential test report number NL/DEK//ExTR17.0063/05.
(9)Compliance with the Essential Health and Safety Requirements has been assured by compliance with:EN IEC 60079-0 : 2018
EN 60079-1 : 2014

EN 60079-11 : 2012
EN 50303 : 2000

except in respect of those requirements listed at item 18 of the Schedule.
(10)

If the sign ”X” is placed after the certificate number, it indicates that the product is subject to the Specific Conditionsof Use specified in the schedule to this certificate.

(11)This EU-Type Examination Certificate relates only to the design and construction of the specified product. Further
requirements of the Directive apply to the manufacturing process and supply of this product. These are not coveredby this certificate.

(12)The marking of the product shall include the following:

II 1 GI M1

Ex da ia IIC T4 Ga or Ex ia IIC T4 Ga andEx da ia I Ma or Ex ia I Ma

Date of certification: 26 April 2024
DEKRA Certification B.V.

ÙL.G. van Schie
Certification Manager
Throughout this document, a point is used as the decimal separator.
© Integral publication of this certificate and adjoining reports is allowed. This Certificate may only be reproduced
in its entirety and without any change.

DEKRA Certification B.V. Meander 1051, 6825 MJ Arnhem P.O. Box 5185, 6802 ED Arnhem The Netherlands
T +31 88 96 83000 F +31 88 96 83100 www.dekra-product-safety.com Registered Arnhem 09085396

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Description

Issue No. 5

The Portable Gas Monitor Models GX-3R and GX-3R Pro are designed to provide continuous
exposure monitoring of combustible gases (LEL, at slot 2 – by sensor type NCR-6309 in type ofprotection Ex da), oxygen (O2, at slot 3), hydrogen sulfide (H2S, at slot 1), sulfur dioxide (SO2, atslot 1) and carbon monoxide (CO, at slot 1) by diffusion sampling method.
The model GX-3R Pro can additionally measure (at slot 4) toxic gases including sulfur dioxide(SO2), ammonia (NH3) etc., and carbon dioxide (CO2) by IR sensor.
The measurement results are displayed on the LCD while gas alarms can be issued via LED andbuzzer. Measurement results can be wirelessly transmitted to a host using Bluetooth.
The enclosure of the Portable Gas Monitor provides a degree of protection of at least IP64 inaccordance with EN 60529.
Marking variationsThe portable gas monitor is in type of protection Ex ia and it can either be equipped with thermo
catalytic gas sensor model NCR-6309 for monitoring combustible gasses (LEL) in type ofprotection Ex da or with a dummy sensor in type of protection Ex ia. Both options are detailed in
the instruction manual.
When equipped with thermo catalytic gas sensor model NCR-6309:
II 1 G Ex da ia IIC T4 Ga
I M1
Ex da ia I Ma
Ambient temperature: -40 °C to +60 °C
When not equipped with thermo catalytic gas sensor model NCR-6309:
II 1 G Ex ia IIC T4 Ga
I M1
Ex ia I Ma
Ambient temperature: -40 °C to +60 °C
Additional information
The performance of the Portable Gas Monitor Models GX-3R and GX-3R Pro, as a safety device,
is not covered by this certificate.
Electrical data
Charging circuit:
Um = 6.3 V (SELV circuit)
Supply (Models GX-3R):
Non user-replaceable rechargeable Li-ion battery pack.
Supply (Models GX-3R Pro):
User-replaceable rechargeable Li-ion battery pack model BUL-3R
orUser-replaceable primary battery pack model BUD-3R including rechargeable backup Lithium
battery.
Installation instructions
The instructions provided with the product shall be followed in detail to assure safe operation.
AM 2972:4

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Report Number

Issue No. 5

NL/DEK//ExTR17.0063/05(17)

Specific conditions of use
When the portable gas monitor is equipped with thermo catalytic gas sensor model NCR-6309 in
type of protection Ex da:- The sensor model NCR-6309 is tested with low risk of mechanical danger for use in a Group Ienvironment, therefore it shall be protected against high impact energy.
- The Sensor model NCR-6309 shall not be exposed to ultraviolet light or used in equipment inwhich it is not fully enclosed.
- The Sensor model NCR-6309 is a flameproof product and is not to be disassembled or
modified with the exception of specified parts.
- The equipment shall not be exposed to oil or hydraulic fluid.

(18)

Essential Health and Safety Requirements
Covered by the standards listed at item (9).

(19)

Test documentation
As listed in Report No. NL/DEK//ExTR17.0063/05.

AM 2972:4

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