Industrial VRS Magnetic Speed Sensors
CONTROL DRAWING FOR DUAL CHANNEL BARRIERS
Hazardous Location
Non-hazardous Location
Speed Sensor
Ground
Intrinsic Safety Barrier
.
HAZARDOUS LOCATIONS
Catalog listing 3042H20:
Class I, Groups A, B, C, D
Class II, Groups E, F, G
Class III
Catalog listing 3042A:
Class I, Groups A, B, C, D
ENTITY PARAMETERS
Vmax = 24 V, Imax = 35 mA, Li = 26 mH, Ci = 0
μF
Any barrier (see General Notes) with entity parameters
connected in accordance with barrier manufacturers
instructions of:
Vmax > Voc
Imax > Isc
Ca > Ci + cable capacitance
La > Li + cable inductance
Catalog listing 3042H20: Green wire must be connected to
SYSTEM PARAMETERS
Any barrier (see General Notes) having one of the following
specified parameters:
Vmax
30
25
Rmin
1414
1160
Vmax
20
15
Rmin
842
556
Vmax
10
5
Rmin
272
2
Exia = Intrinsically Safe, Sécurité Intrinsèque
intrinsically safe system ground.
SENSOR GROUNDING
Catalog listing 3042A: Sensor housing must be connected to
intrinsically safe system ground during installation.
GENERAL NOTES
1. For jurisdictions requiring certification to the applicable
Canadian standards, the barrier must be CSA Certified
and the system must be installed in accordance with the
Canadian Electrical Code Part 1.
2. For jurisdictions requiring Certification to the applicable
Occupational Safety and Health Administration (OSHA)
standards, the barrier must be CSA NRTL or equivalent
and the system must be installed in accordance with the
National Electrical Code (NEC), article 504 or
ANSI/NFPA 70.
Honeywell Sensing and Control
7
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