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 19.0059

Page 1 of 4

Status:Current

Issue No: 2

Date of Issue:

2024-04-24

Applicant:

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

Equipment:

Portable Gas Monitor 04 series models OX-04, OX-04G, HS-04, CO-04, CX-04 and SC-04

Optional accessory:
Type of Protection:

Ex iMarking:Ex ia IIC T4...T3 Ga

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)

2024-04-24

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 1 (2020-06-25)
Issue 0 (2019-10-17)

IECEx Certificateof Conformity
Certificate No.:

IECEx DEK 19.0059

Page 2 of 4

Date of issue:

2024-04-24

Issue No: 2Manufacturer:

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

Manufacturinglocations:

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

RIKEN KEIKI NARA MFG. Co., Ltd.
49‐1, Abe, Sakurai‐shi,Nara, 633‐0054,
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 SchemeRules, 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 60079-11:2011
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 Report:
NL/DEK/ExTR19.0069/02
Quality Assessment Reports:
NL/DEK/QAR23.0010/00

NL/DEK/QAR23.0011/00

IECEx Certificateof Conformity
Certificate No.:

IECEx DEK 19.0059

Page 3 of 4

Date of issue:

2024-04-24

Issue No: 2

EQUIPMENT:
Equipment and systems covered by this Certificate are as follows:
The Portable Gas Monitor 04 series models OX-04, OX-04G, HS-04, CO-04, CX-04 and SC-04 are designed to provide continuous exposure
monitoring of toxic gases and/or oxygen by diffusion sampling method.
Portable Gas Monitor is available either as a single gas monitor for measuring carbon monoxide (CO) (model CO-04), hydrogen sulfide (H2S)(model HS-04), oxygen (O2) (models OX-04 and OX-04G), sulphur dioxide (SO2) (model SC-04) or as dual gas monitor for measuring
simultaneously (CO/O2) (model CX-04).
Sensor types used are either electrochemical or galvanic type.
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 IrDA.
The examination of the Portable Gas Monitor does not include a judgement of the functional performance of the apparatus.
Ambient temperature: -40 °C to +60 °C
Marking variations
Ex ia IIC T4 Ga (when equiped with primary batteries)
Ex ia IIC T3 Ga (when equiped with secondary batteries)
Both options are detailed in the instruction manual.
Electrical data
Supply:User-replaceable primary alkaline battery pack (3.3 V)
orsecondary Ni-MH battery pack (3.1 V, 800 mAh).
SPECIFIC CONDITIONS OF USE: NO

IECEx Certificate
of Conformity
Certificate No.:

IECEx DEK 19.0059

Page 4 of 4

Date of issue:

2024-04-24

Issue No: 2

DETAILS OF CERTIFICATE CHANGES (for issues 1 and above)
1. Minor change on the label drawing and instructions.
2. Linked to new QARs.
3. Manufacturing location Ebina Denki is no longer listed.