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Oil pressure sensing devices for use on oil burner systems using any type of fuel oil, including heavy pretreated oils.


  • Clear plastic cover allows observation of the pressure settings.
  • Models have snap-acting switching to open or close a circuit on pressure rise.
  • L404T High pressure limit, break a circuit on oil pressure rise above setpoint.
  • L404V Low Pressure limit, makes a circuit on oil pressure rise above setpoint.
  • Adjustments are made by screws on top of case.
  • Mount using 1/4 inch -18 NPT internal pipe threads or surface mount through base of case.
  • Ground screw terminal.

Product Specifications

Oil pressure limit switch for fuel oil, including heavy oil applications
Dimensions (in.)
4 31/32 in. high x 4 1/2 in. wide x 2 3/4 in. deep
Dimensions (mm)
126 mm high x 114 mm wide x 70 mm deep
Miss-wiring Compliant (less B terminal)
1/4 in. NPT internal thread or surface mount through back of case
Approvals, Underwriters Laboratories Inc.
Listed: File No. MP2168, Guide No. MFHX
Approvals, Canadian Standards Association
Certified: File No. LR95329
Electrical Connections
Screw terminals
Contact Ratings
120 Vac Switch Contact-- 8.0 AFL, 48.0 ALR, 10.0 A resistive; 240 Vac Switch Contact-- 5.1 AFL, 30.6 ALR, 5.0 A resistive;
Operating Temperature Range (F)
-35 F to +150 F
Operating Temperature Range (C)
-37 C to +66 C
Sensor Element
Stainless Steel diaphragm
Operating Range (psi)
5 to 50 psi; 85 psi - Maximum Sustained
Operating Range (kPa)
35 to 350 kPa; 586 kPa - Maximum Sustained
Differential Pressure Range (psi)
6 to 14 psi
Differential Pressure Range (kPa)
40 to 100 kPa
Differential Type
Switch Operation
Auto recycle
Switching Action
Snap switch makes R-W on pressure rise
Pipe Connection
Main or High Pressure--1/4 in. NPT internal thread
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