5
RS74A
Auto Reset
6 Specifications
Models: RS74A and RS74M
6.1 Pressure Range
50 to 1500 psi (345 to 10,340 kPA)
6.2 Max Safety Pressure
5000psi (34,473 kPA), all models.
6.3 Temperature Range
Auto Reset
Process temperature –45°C to 140°C
Ambient Temperature -40°C to 60°C
Manual Reset
Process temperature –45°C to 120°C
Ambient Temperature -40°C to 40°C
6.5 Certification Markings
Class I, Division 1, Groups B, C and D; Type 4
Ex d IIB+H2; IP54
Zone 1 AEx d IIB+H2; IP54
Tamb -40˚C to +60˚C; T4
Use Supply Wires Suitable For 96˚C
6.6 Process Connection; NACE MR0175-2003
2” MNPT Threaded Connection
SA350 LF2 Class 1, Zinc Plated
Diaphragm Inconel 718
Retaining Ring 316 SS
CRN: 0F10666.2
6.7 Input Ratings (model dependent)
RS74M
Manual Reset
Figure 6
Manual Reset Auto Reset
Single Pole Double Throw
15A—125, 250 or 480 VAC
1/4 HP—125 VAC, 1/2 HP– 250 VAC
1/2A—125 VDC, 1/4A—250 VDC
Single Pole Double Throw
15A—125, 250 or 480 VAC, 2A—600 VAC
1/8 HP—125 VAC, 1/4 HP—250 VAC
1/2A—125VDC, 1/4A—250 VDC
IMPORTANT INFORMATION -Process Temperature Testing
Pressure Switches with the minimum Class 1 Div 1 name plate markings do not meet CSA C22.2 No
E60079-0:2007 which requires a maximum process temperature to be applied for explosion proof test-
ing.
All Robinson Pressure Switches in addition to meeting the minimum Class 1 Div 1 have also been tem-
perature tested to CSA C2.2 No E60079-0:2007 and are legally allowed to have the additional markings
of Ex d IIB+H2; IP54 Zone 1 AEx d IIB+H2; IP54 Tamb -40˚C to +60˚C; T4
ZIMCO INSTRUMENTATION INC.
11141
15 Street NE, Calgary, AB, T3K 0Z5, Canada
Phone:
403-253-8320
Email:
Website:
www.zimco.ca
