Intrinsically Safe Barrier / ION7650

[gord_integris-t]

Any recommended models for an Intrinsically Safe Barrier (Zener Barrier) for an ION 7650 (pulse inputs) that is being connected to a gas meter?

[Anonymous user]

Here in Huntington Indiana, NIPSCO specified their own intrinsically safe barrier. It was a Peppler Fuchs from Newark, part #81C8243, PF Catalog # KFD2-SR2-EX2.W. Wired contacts from Nipsco meter to intrinsically safe relay in Nema-4X box 10' away from meter. See link to barrier below and reference EX 0,1,2, Div 1,2 environment.

Not an expert defining customer's classifications, but we are using this for pulse counting natural gas consumption from providers meter.

Paul C.

http://www.farnell.com/datasheets/1919433.pdf?_ga=1.149296054.1034508146.1449075413

IEC 60079-10.1 Classification of areas - Explosive gas atmospheres

Zone	Nature and Probability of Hazard Material
Zone 0	Ignitable concentrations of flammable gases or vapors which are present continuously or for long periods of time.
Zone 1	Ignitable concentrations of flammable gases or vapors which are likely to occur under normal operating conditions.
Zone 2	Ignitable concentrations of flammable gases or vapors which are not likely to occur under normal operating conditions and do so only for a short period of time.

Dusts

IEC 60079-10.2 Classification of areas - Combustible dust atmospheres

Zone	Nature and Probability of Hazard Material
Zone 20	An area where combustible dusts or ignitable fibers and flyings are present continuously or for long periods of time.
Zone 21	An area where combustible dusts or ignitable fibers and flyings are likely to occur under normal operating conditions.
Zone 22	An area where combustible dusts or ignitable fibers and flyings are not likely to occur under normal operating conditions and do so only for a short period of time.

Zones compares to classes and divisions in the North American Class/Division system.

Group

Group define the type of hazardous material and (partly) the location of the surrounding atmosphere. Group is divided in three groups where group I is reserved for mining locations.

Group		Type of Hazardous Material and Location of Atmosphere
Group I		Mines susceptible to firedamp (flammable mixture of gases naturally occurring in a mine).
Group II		Explosive gas atmosphere other than mines susceptible to firedamp. Group II equipment is subdivided into three subgroups.

[JamesAZZO]

Phoenix Contact makes a low cost option 24Vdc powered with opto isolation. We use it all the time. 

[gord_integris-t]

Thanks for the info - I'll add that to my list.

[gord_integris-t]

Thanks for the great breakdown Paul!