1. “Hydrogen detection apparatus” Dr. Ichiro Matsubara, convener
ISO/ TC 197/ WG 13
“Hydrogen detection apparatus”
WD 26142
ISO TC197/WG13
Yuko Yasutake for
Dr. Ichiro Matsubara, convener

2. Outline
◆ Background
◆ NWIP
◆ Scope
◆ Issues
◆ Future plan

3. Hydrogen detection apparatus
Hydrogen stations in Japan
11 locations as of June 2004
Safety: detect hydrogen leaks at hydrogen facilities
Essential component of the hydrogen economy

4. Detectors in use

5. Feature: multi-level safety system
Performance requirements
・High sensitivity
・Broad detection range
・Quick response
・Long-term stability
JHFC H2 Refueling Station
from
Safety operation
4%v/v, LEL
(Lower Explosive Limit)
・ Station-wide shutdown
・ Shutdown of hydrogen fuel
Hydrogen concentration
1%v/v
5000 ppm
・ Forced ventilation
・ Nitrogen purge
500 ppm

6. flammable gas detection
Related standards:
flammable gas detection
IEC IEC ～6: (1998)　　　
　　　　 Electrical apparatus for the detection and measurement
of flammable gases - Part 1~6
UL ANSI / UL2075　(2004)
Standard for Gas and Vapor Detectors and Sensors
CSA C22.2.No.152-M (1984)
Combustible Gas Detection Instruments
JIS JIS M 7626-(1994) 　Stationary combustible gas alarms
JIS M 7653-(1996) 　Portable combustible gas detectors
CSA: Canadian Standard Association
No standards specific to hydrogen

7. IEC61779 Need for a new standard specific to hydrogen detection
Parameters required for multi-level safety mechanism
IEC61779
Accuracy ○
Response speed
Stability
Detection range X
Selectivity x
Poisoning
Test methods △
Not included in
IEC61779
Not adequate for multi-
level safety systems
Need for a new standard specific to hydrogen detection

8. New Work Item Proposal NWIP submitted on May 09, 2005
For： Argentina, Austria, Korea,
　　　　Denmark, France, Italy,
　　　　Holland, Norway, Spain
Against： Canada, Germany
Abstained：Sweden, Switzerland,
the U.S.
Approved
エネルギー・環境技術標準
　基盤研究（簡易型水素センサ）
WG13 formed on September 08, 2005

9. WG13 ◆ Convener and secretary: Japan ◆ Experts
　　Original： Japan, France, U.S.A., Norway, Korea,
　　　　　　　 Argentina, Holland
　　Feb. 2007：Japan, France, U.S.A. Norway, Korea,
　　　　　　　 Argentina, Holland, Spain, Germany,
Italy, Canada (26 in total)
◆ Liaison
　　IEC/TC31, Joint Research Center (EU)

10. WG13 at present ◆Meetings: 1. Tokyo on January 23 and 24, 2006
2. Paris on June 07, 2006
3. Vancouver, B.C. on October 31 and Nov.1, 2006
CD was circulated on February 08, 2007 with
the deadline for comments on May 08, 2007

11. Scope
This international standard defines the performance requirements and test methods of stationary hydrogen detection apparatus that is designed to measure and monitor hydrogen concentrations. The provisions in this standard cover the hydrogen detection apparatus used to achieve the single and/or multi-level safety operations such as nitrogen purging or ventilation and/or system shut-off corresponding to the hydrogen concentration. The requirements applicable to the control system as well as the installation requirements of such apparatus are excluded. This standard sets out only the requirements applicable to a product standard of a hydrogen detection apparatus, such as precision, response time, stability, measuring range, selectivity, and poisoning.
This standard can be used for the quality assessment or certification of the detection apparatus and establishes the provisions for type test.

12. Relationship with IEC TC31
Hydrogen is one of flammable gases, and, as such, hydrogen detectors should be covered by IEC TC31.
◆ISO TC197 WG13:
IEC60079, a document covering different flammable gases, lacks in the criteria for detection range, selectivity, and poisoning resistance in its current format. A new standard for hydrogen-specific requirements is needed.
◆ISO TC197
Liaison with IEC TC31

13. Major features of WG13 draft
Parameter
IEC61779
ISO WD26147
Precision ○
Response speed
Stability
Detection range x
Selectivity
Poisoning
Test methods △
試験方法の詳細要

14. Detection Range Wide detection range ppm～% Requirement
Hydrogen concentration
　Safety operation
4%v/v, LEL
(lower Explosive Limit)
・ Station shutdown
・ Hydrogen shutdown
1%v/v
Detected concentration
5000 ppm
・ Forced ventilation
・ Nitrogen purge
500 ppm
Wide detection range
　　 ppm～%
Requirement

15. Poisoning “poisoning” Poisoning test needed Sensor device Interaction
Chemicals
Sensor device
Target H2
Interaction
• Adsorption
• Chemical reaction
“poisons”
Harmful chemicals
• Organic silicone
• Hydrogen sulfide, Ammonia
• Ethanol, etc.
“poisoning”
Sensor
degradation
Poisoning test needed

16. Selectivity to be provided
Gases in the atmosphere
• From exhaust (CO, NOx, SOx)
• From fuel （n-butane, i-butane）
Application
Hydrogen stations and related facilities
Selective detection required
Selectivity to be provided

17. Test Method IEC61779 ISO WD26147 ✔ Chamber-type ✔ Simple methods
✔ Simple procedures
Example of proposed chamber

18. Outstanding Issues
Application (specific to fuel stations or broader?)  single vs. multi-level
Detection range (based on the current market vs. based on the anticipated needs)
Consistency with IEC TC31 or more hydrogen specific requirements

19. From here…. ◆Comments for CD: May 08, 2007
◆Next meeting: June 6 to 9, 2007
Seoul, Korea (with WG12)
◆Target dates:
DIS: August 2007
FDIS: August 2008
IS: February 2009

20. Thank you! Your opinion is important to our CD!
Please contact your national committee for comments.
Contact info:
Convener:
Dr. Ichiro Matsubara:
Secretary:
Yuko Yasutake: