a. Nominal at midscale operating range.

b. Brass bellows instead of stainless steel diaphragm.

c. Models with 1/4-19 BSPT thread instead of 1/4-18 NPT thread.

d. Make-on-rise models with terminal B omitted for miswiring compliance.

Features

• Use with steam, air, noncombustible gases, or fluids non-corrosive to pressure sensing element.
• Models have snap-acting switching to open or close a circuit on pressure rise.
• Have adjustable differentials.
• 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

Application: Provide control of steam, air, non-combustible gases or non-corrosive fluids

Dimensions (in.): 4 27/32 in. high x 4 1/2 in. wide x 3 1/4 in. deep

Dimensions (mm): 123 mm high x 114 mm wide x 83 mm deep

Mounting: 1/4 in. NPT internal thread or surface mount through back of case

Approvals, Underwriters Laboratories Inc.: Listed: File No. MP466, Guide No. MBPR

Approvals, Canadian Standards Association: Certified: File No. LR1620, Guide No. 400-E-O

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

Approvals, Swiss RE: Acceptable

Sensor Element: Stainless Steel diaphragm

Differential Type: Subtractive

Switch Operation: Auto recycle

Switching Action: SPDT snap action, make R-W, break R-B on pressure rise

Pipe Connection: Main or High Pressure–1/4 in. NPT internal thread

Resources:

• Honeywell L404 PressureTrol Product Data and Specifications