5
6 Specifications
Models: RS74A 750Fand RS74M-750F
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 up to 400°C
Ambient Temperature -40°C to 40°C
Manual Reset
Process temperature up to 400°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; T2
Use Supply Wires Suitable For 96˚C
6.6 Process Connection; NACE MR0175-2003
2” MNPT Threaded Connection
SA-193-B7M, Zinc Plated
Diaphragm: Inconel 718
Retaining Ring: Incoloy 925
Primary Seal: Graphite
6.7
Input Ratings (model dependent):
RS74A-750F
Auto Reset
RS74M-750F
Manual Reset
Figure 6
IMPORTANT INFORMATION about 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
Manual Reset Model
Auto Reset Model
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
ZIMCO INSTRUMENTATION INC.
11141
15 Street NE, Calgary, AB, T3K 0Z5, Canada
Phone:
403-253-8320
Email:
Website:
www.zimco.ca
