Certificate / Certificat
Zertifikat /RK 2103038 C004
exida hereby confirms that the:The manufacturer
may use the mark:Gas Detector with Signal Converter
Model SD-3 Series
RI/NC/EC(CO, H2S, O2)/ECB
RIKEN KEIKI Co., Ltd.
Itabashi-ku, Tokyo - Japan
Has been assessed per the relevant requirements of:

IEC 61508 : 2010 Parts 1-7
and meets requirements providing a level of integrity to:

Systematic Capability: SC 3 (SIL 3 Capable)
Random Capability: Type B Element
SIL 2 @ HFT=0; SIL3 @ HFT = 1; Route 1H
Revision 5.1 August 21, 2023Surveillance Audit Due
August 31 , 2024

PFH/PFDavg and Architecture Constraints
must be verified for each application
Safety Function:
The Model SD-3 Series is a fixed type explosion-proof gas
detectors that continuously monitor for combustible gases, toxic
gases, and oxygen in the surrounding atmosphere. when thegas concentration is over the set value. The Model SD-3 Series
detect gas leaks and activate an alarm when preset
concentrations are exceeded. The Model SD-3 Series detect
gas concentrations and convert 4-20 mA output with HART
signal. The Model SD-3 Series has two types, direct sensor
mount type and remote sensor type.
Application Restrictions:
The unit must be properly designed into a Safety Instrumented
Function per the Safety Manual requirements.

Place embossed
seal here fororiginals, lining it
up at the bottom#1004

Evaluating Assessor

Certifying Assessor
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Certificate / Certificat / Zertifikat /RK 2103038 C004
Systematic Capability: SC 3 (SIL 3 Capable)
Random Capability: Type B Element
SIL 2 @ HFT=0; SIL 3 @ HFT = 1; Route 1H
PFH/PFDavg and Architecture Constraints
must be verified for each application

Gas Detector withSignal Converter
Model SD- 3 Series
RI/NC/ECB/EC(CO, H2S, O2))

Systematic Capability:
The product has met manufacturer design process requirements of Safety
Integrity Level (SIL) 3. These are intended to achieve sufficient integrity
against systematic errors of design by the manufacturer.
A Safety Instrumented Function (SIF) designed with this product must not
be used at a SIL level higher than stated.
Random Capability:
The SIL limit imposed by the Architectural Constraints must be met foreach element. This element meets exida criteria for Route 2H.

IEC 61508 Failure Rates in FIT*Device/Configuration
SD-3RISD-3NC

λSD

λSUλDDλDU

SFF

Direct Sensor Mount type

-

32

1,105

90

92.7%

Remote Sensor type-361,536 107

93.6%

Direct Sensor Mount type-

256 6,673 330

95.5%

Remote Sensor type-

262 7,039 348

95.5%

Direct Sensor Mount type
SD-3EC(CO, H2S, O2) Remote Sensor type-1524 2,400 244

94.1%

-

1529 2,863 263

94.4%

Direct Sensor Mount type-1526 2,643 247

94.4%

Remote Sensor type-

1531 3,106 266

94.6%SD-3ECB* FIT = 1 failure / 109 hours

SIL Verification:
The Safety Integrity Level (SIL) of an entire Safety Instrumented Function (SIF)
must be verified via a calculation of PFH/PFDavg considering redundantarchitectures, proof test interval, proof test effectiveness, any automatic
diagnostics, average repair time and the specific failure rates of all products
included in the SIF. Each element must be checked to assure compliance withminimum hardware fault tolerance (HFT) requirements.
The following documents are a mandatory part of certification:
80 N Main StSellersville, PA 18960

T-110, V5R1

Assessment Report: RK 21-03-038 R005 V5 R1(or later)
Safety Manual: PT2E-306 (Rev.12) (or later)

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