IECEx Certificateof Conformity
INTERNATIONAL ELECTROTECHNICAL COMMISSION
IEC Certification System for Explosive Atmospheres
for rules and details of the IECEx Scheme visit www.iecex.com

Certificate No.:

IECEx DEK 17.0050X

Page 1 of 5

Status:Current

Issue No: 5

Date of Issue:

2024-04-26

Applicant:

RIKEN KEIKI Co., Ltd.
2-7-6, Azusawa,
Itabashi-ku,
Tokyo, 174-8744,
Japan

Equipment:

Portable Gas Monitors models GX-3R and GX-3R Pro

Optional accessory:
Type of Protection:

Ex da ia

Marking:

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

Approved for issue on behalf of the IECEx
Certification Body:

L.G. van Schie

Position:

Certification Manager

Signature:(for printed version)Date:(for printed version)

2024-04-26

1. This certificate and schedule may only be reproduced in full.
2. This certificate is not transferable and remains the property of the issuing body.
3. The Status and authenticity of this certificate may be verified by visiting www.iecex.com or use of this QR Code.

Certificate issued by:
DEKRA Certification B.V.
Meander 1051
6825 MJ Arnhem
Netherlands

Certificate history:
Issue 4 (2022-10-27)
Issue 3 (2022-05-17)
Issue 2 (2020-07-07)
Issue 1 (2018-12-05)
Issue 0 (2018-07-06)

IECEx Certificateof ConformityCertificate No.:

IECEx DEK 17.0050X

Page 2 of 5

Date of issue:

2024-04-26

Issue No: 5

Manufacturer:

RIKEN KEIKI Co., Ltd.
2-7-6, Azusawa, Itabashi-Ku,
Tokyo, 174-8744,
Japan

Manufacturinglocations:

RIKEN KEIKI NARA MFG. Co., Ltd.
49‐1, Abe, Sakurai‐shi,Nara, 633‐0054,
Japan

RIKEN KEIKI Co. Ltd
2-3, Minamisakae-cho,
Kasukabe-shi,
Saitama, 344-0057
Japan

This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with theIEC Standard list below and that the manufacturer's quality system, relating to the Ex products covered by this certificate, was assessed andfound to comply with the IECEx Quality system requirements.This certificate is granted subject to the conditions as set out in IECEx Scheme
Rules, IECEx 02 and Operational Documents as amended
STANDARDS :The equipment and any acceptable variations to it specified in the schedule of this certificate and the identified documents, was foundto comply with the following standards
IEC 60079-0:2017
Edition:7.0

Explosive atmospheres - Part 0: Equipment - General requirements

IEC 60079-1:2014
Edition:7.0

Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"IEC 60079-11:2011
Edition:6.0

Explosive atmospheres - Part 11: Equipment protection by intrinsic safety "i"This Certificate does not indicate compliance with safety and performance requirements
other than those expressly included in the Standards listed above.
TEST & ASSESSMENT REPORTS:
A sample(s) of the equipment listed has successfully met the examination and test requirements as recorded in:
Test Reports:
NL/DEK/ExTR12.0033/02
NL/KEM/ExTR07.0057/04

NL/DEK/ExTR17.0047/02

Quality Assessment Reports:
NL/DEK/QAR23.0010/00

NL/DEK/QAR23.0011/00

NL/DEK/ExTR17.0063/05

IECEx Certificate
of Conformity
Certificate No.:

IECEx DEK 17.0050X

Page 3 of 5

Date of issue:

2024-04-26

Issue No: 5

EQUIPMENT:
Equipment and systems covered by this Certificate are as follows:
Description
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 of protection Ex da), oxygen (O2, at slot 3), hydrogen sulfide (H2S, at slot 1), sulfur dioxide(SO2, at slot 1) and carbon monoxide (CO, at slot 1) by diffusion sampling method.
The model GX-3R Pro can aditionaly 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 and buzzer. 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 in accordance with IEC 60529.

SPECIFIC CONDITIONS OF USE: YES as shown below:
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 I environment, therefore it shall be protectedagainst high impact energy.
• The Sensor model NCR-6309 shall not be exposed to ultraviolet light or used in equipment in which 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.

IECEx Certificate
of Conformity
Certificate No.:

IECEx DEK 17.0050X

Page 4 of 5

Date of issue:

2024-04-26

Issue No: 5

Equipment (continued):Marking variations
The portable gas monitor is in type of protection Ex ia and it can either be equipped with thermo catalytic gas sensor model NCR-6309 formonitoring combustible gasses (LEL) in type of protection 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:
Ex da ia IIC T4 Ga
Ex da ia I Ma
Ambient temperature: -40 °C to +60 °C
When not equipped with thermo catalytic gas sensor model NCR-6309:
Ex ia IIC T4 Ga
Ex ia I Ma
Ambient temperature: -40 °C to +60 °C
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.

IECEx Certificate
of Conformity
Certificate No.:

IECEx DEK 17.0050X

Page 5 of 5

Date of issue:

2024-04-26

Issue No: 5

DETAILS OF CERTIFICATE CHANGES (for issues 1 and above)
1. Minor change on the label drawings and instructions.
2. Specific conditions of use are reworded.
3. Linked to new QARs.
4. Manufacturing location Ebina Denki is no longer listed.