PEECO N Series Flow Switch

N Series Flow Switch

Flow-Actuated Electrical Switching for Non-Hazardous Locations

Up to 600 PSI | Liquid or Gas Service

The PEECO N Series Flow Switch is a rugged, flow-actuated electrical switch engineered for non-hazardous industrial environments requiring dependable performance, long service life, and precise flow detection. Designed for liquid or gas service, these switches operate at pressures up to 600 PSI and are custom-produced to meet the exact requirements of each application.

Unlike mass-produced “shelf” switches, every PEECO N Series unit is built specifically for your operating conditions—ensuring accurate actuation, minimal dead band, and reliable performance over a wide range of line sizes and process conditions.

Built for Your Application — Not a Shelf

PEECO N Series flow switches are maintenance-free and available for line sizes from 1/16″ up to 12″ and larger. Each of the four basic styles can be adapted to a wide variety of piping connections, fittings, and configurations.

These switches incorporate the same proven design principles and internal reliability as PEECO’s explosion-proof models, but are configured for non-hazardous locations using a rugged, slip-on steel cover and weather-tight enclosure.

Weather-Tight, Industrial-Grade Construction

• NEMA 4X weatherproof design
• .062″ thick slip-on cover
• Precision machined mechanical groove with O-ring seal (standard on all non-explosion-proof models)
• Heat-treated 356-T6 aluminum housing and cover, epoxy coated for enhanced corrosion resistance

This construction protects internal components from moisture, dust, and harsh outdoor or wash-down environments.

Actuated by Flow — Not Pressure

The PEECO N Series is true flow-actuated, eliminating the uncertainty common with pressure-based switches.

• No concern with minimum or maximum flow limits
• You define the flow requirement — PEECO engineers the solution
• Fully field adjustable across the entire operating range
• Less than 10% dead band/differential between make and break

Flow indication can be configured to respond to:

• Increase in flow
• Decrease in flow
• Flow reversal

Mechanical motion is transmitted from the process media by paddle deflection through the stem and bellows or flexure tube assembly, actuating the micro-switch and delivering a precise electrical signal to the desired control point.

Leak-Proof by Design

The bellows or flexure tube is silver brazed or welded per application requirements, creating an inherently leak-proof seal. This design eliminates the need for packing glands or stuffing boxes—reducing maintenance, improving reliability, and preventing process leakage.

Extreme Operating Range

• Temperature: From -450°F to +1,500°F (application dependent)
• Pressure: From high vacuum service up to 600 PSI

This wide operating envelope allows the N Series to be used across diverse industries and applications.

Engineering Support Included

PEECO’s experienced technical staff is available at no cost to assist with:

• Application consultation
• Engineering and layout support
• Design optimization
• General flow-control guidance

You get more than a switch—you get engineering expertise.

Standard Specifications

• Cover: Heat Treated Aluminum 356-T6
• Housing: Heat Treated Aluminum 356-T6
• Body: Carbon Steel or 316 Stainless Steel
• Bellows: Seamless 321 Stainless Steel
• Stem / Paddle: 302 / 303 Stainless Steel
• Bearings: 440C Stainless Steel Micro Ball
• Nameplates: Stainless Steel
• Micro-Switch: SPDT, 15A @ 125/250/480 VAC
  • 1/8 HP @ 125 VAC
  • 1/4 HP @ 250 VAC
  • 1/2A @ 125 VDC / 1/4A @ 250 VDC
  • UL Code L96 (1 N.O., 1 N.C., 1 Common)
• Conduit Connection: 1/2″ FNPT
• Maximum Pressure: 600 PSI (41 bar)
• Maximum Temperature: 300°F (148°C) standard

N Series vs. Standard 300°F Flow Switches

Feature	Standard Flow Switch	PEECO N Series Flow Switch
Actuation Method	Often pressure-based	True flow-actuated
Application Flexibility	Fixed limits	Custom-engineered per application
Maximum Pressure	Typically ≤ 300 PSI	Up to 600 PSI
Line Size Capability	Limited	1/16″ to 12″ and larger
Adjustment Range	Narrow	Fully field adjustable across full range
Dead Band / Differential	High or undefined	<10% make/break differential
Leak Prevention	Packing glands / seals	Welded or brazed bellows — inherently leak-proof
Environmental Protection	Basic enclosures	NEMA 4X weather-tight enclosure
Durability	Moderate	Industrial-grade, epoxy-coated construction
Engineering Support	Limited or none	Included technical consultation

The Advantage

Standard flow switches are built to generic limits and often struggle with reliability, leakage, and inconsistent actuation. The PEECO N Series Flow Switch is purpose-built—offering superior accuracy, longer service life, higher pressure capability, and true flow-based actuation for demanding industrial applications.

Available PEECO Models