Operation
The SIEMENS System 3 Intrinsically Safe Zone Model
ZS-30, consisting of a Zone Module and a Diode
Shunt Barrier, is designed for use in System 3 low
voltage control anels. With detection devices located
in hazardous areas identified as Class I, II, and III,
Division 1, Grou s A, B, C, D, E, F, and G, the intrinsi-
cally safe characteristic is achieved by using a diode
shunt barrier (P/N 515-180238) with the ZS-30. The
Diode Shunt Barrier, though hysically a se arate unit
of ZS-30, must always be used to achieve an intrinsi-
cally safe zone. The Diode Shunt Barrier limits the
energy to the detector circuit.
The following equi ment is covered by this instruction
sheet.
Item Name and
Model Number Description
NON-HAZARDOUS LOCATION QUIPM NT
Model ZS-30 Zone module (P/N 515-022079)
Model 515-180238 Diode shunt sa ety barrier
(P/N 515-180238)
HAZARDOUS LOCATION QUIPM NT
Detector DI-3IS
Detector S121
Detector S122
Base DB-3 For use with DI-3IS
Cable 465-514391 Limited-energy shielded cable
(Optional)
Check that each device to be located in the intrinsi-
cally safe area has an FM intrinsically safe label. In
addition, direct shorting manual stations and/or
thermal detectors (devices not containing any energy
storing, or voltage roducing, com onents) may be
connected in the detector loo without jeo ardizing the
intrinsically safe characteristics of the system.
NEC Hazardous Location Classification
Class I: Class I locations are those in which flammable
gases or va ors are (or may be) resent in the air in
quantities sufficient to roduce ex losive or ignitable
mixtures.
Class II: Class II locations are those that are hazardous
because of the resence of combustible dust.
Class Ill: Class Ill locations are those that are hazardous
because of the resence of easily ignitable fibers or
flyings, but in which such fibers or flyings are not likely
to be in sus ension in the air in quantities sufficient to
roduce ignitable mixtures.
Division 1: A Division 1 location is a location (a) in
which hazardous concentrations of flammable gases or
va ors exist continuously, intermittently, or eriodically
under normal o erating conditions; or (b) hazardous
concentrations of such gases or va ors may exist
frequently because of re air or maintenance o erations
or because of leakage; or (c) breakdown or faulty
o eration of equi ment or rocesses that might release
hazardous concentrations of flammable gases or va ors
occur and might also cause simultaneous failure of
electric equi ment.
Group A: Grou A atmos heres contain acetylene.
Group B: Grou B atmos heres contain such chemi-
cals as butadiene, hydrogen ethylene oxide
(or gases or va ors of equivalent hazard to
hydrogen, such as manufactured gas), or
ro ylene oxide.
Group C: Grou C atmos heres contain such chemicals
as acetaldehyde, cyclo ro ane, diethyl
ether, ethylene, iso rene, or unsymmetrical
dimethyl hydrazine (UDMH).
Group D: Grou D atmos heres contain such chemicals
as acetone, acrylonitrile, alcohols, ammonia,
Operation and Installation Instructions
MODEL ZS-30
Intrinsically Safe Module
Fire Safety
Siemens Building Technologies, Inc.
8 Fernwood Road
Florham Park, New Jersey 0 932
Siemens Building Technologies, Ltd.
2 Kenview Boulevard
Brampton, Ontario L6T 5E4 CN
P/N 315-024056-17
