PEECO FLOW SWITCH

PEECO Flow Switch Product Line Overview

Power Engineering & Equipment Company (PEECO) flow switches are proudly made in the USA and engineered to deliver unmatched reliability, accuracy, and durability across the most demanding industrial applications. PEECO offers three distinct flow switch series to cover the full spectrum of operating conditions:

• N Series – Non-explosion-proof flow switches for non-hazardous locations
• E Series – Explosion-proof flow switches for hazardous environments
• H Series – Ultra-high-pressure, explosion-proof flow switches for extreme service

Each PEECO flow switch is custom-designed, not pulled from a shelf. Built to your exact application requirements, these flow-actuated electrical switches provide years of dependable service in lines ranging from 1/16″ to 12 feet or larger.

Proven Mechanical Reliability

PEECO flow switches are simple, precision mechanical devices with minimal movement and negligible friction. This design philosophy results in exceptional repeatability, long service life, and consistent performance—even in harsh industrial environments.

When properly engineered, there is nothing to interfere with operation. A change in flow conditions mandates a positive, immediate response from the PEECO flow switch.

True Flow Actuation — Not Pressure

All PEECO flow switches are actuated by flow velocity, not pressure, eliminating the uncertainty common with pressure-based devices.

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

Operating ranges span:

• Temperatures: From –450°F to +1,500°F
• Pressure: From high vacuum service to 10,000 PSI

Designed for Your Application

PEECO flow switches are engineered to minimize pressure drop and are available in:

• Explosion-proof and non-explosion-proof designs
• Any electrical rating required
• Any type of process connection
• Most metals, including stainless steels
• Specialty materials such as Teflon® and engineered plastics

The desired flow condition—increase, decrease, or reverse flow—is transmitted mechanically by deflection of the paddle through the stem and bellows or flexure tube assembly. This motion actuates the micro-switch, producing a precise electrical signal for control systems, alarms, or safety interlocks.

• Stem travel:
  • 1/16″ (H Series)
  • 1/4″ (E Series)
• Micro-switch travel: Approximately 0.005″

Bellows or flexure tubes are silver-brazed or welded per specification, creating an inherently leak-proof design without packing glands or stuffing boxes.

Versatility Without Equal

PEECO flow switches are trusted worldwide in process control, industrial automation, and fluid management systems, including chemical processing, pharmaceutical manufacturing, power generation, and countless other industries requiring precise flow detection.

High or low pressure. High or low temperature. Extreme flow conditions.
The versatility of PEECO Flow Switches is unmatched in the field of flow control.

PEECO Flow Switch Series Selection Guide

Choosing the Right Series for Your Application

PEECO offers three distinct flow switch series designed to cover non-hazardous, hazardous, and extreme-pressure applications. All PEECO flow switches are flow-actuated (not pressure-based), custom engineered, and built for long-term industrial service.

Use the guide below to quickly identify the correct series for your operating conditions.

Quick Selection Table

Feature / Requirement	N Series	E Series	H Series
Location Classification	Non-Hazardous	Hazardous	Hazardous
Explosion-Proof	❌ No	✔ Yes	✔ Yes
Maximum Pressure	Up to 600 PSI	Up to 600 PSI	Up to 10,000 PSI
Recommended Pressure Range	Low to Medium	Low to Medium	All applications above 600 PSI
Service Media	Liquid or Gas	Liquid or Gas	Liquid or Gas
Actuation Method	True flow-actuated	True flow-actuated	True flow-actuated
Sealing Method	Bellows	Bellows	Solid rod with flexure tube
Leak-Proof Design	✔ Yes	✔ Yes	✔ Yes
Line Size Capability	1/16″ to 12′+	1/16″ to 12′+	1/16″ to 12′+
Temperature Capability*	–450°F to +1500°F	–450°F to +1500°F	–450°F to +1500°F
Field Adjustable	✔ Yes	✔ Yes	✔ Yes
Typical Enclosure	NEMA 4X	Explosion-Proof	Explosion-Proof
Certifications	Industrial / UL electrical	UL, CSA, Class I Group D	UL, CSA, International & Military
Typical Applications	General industrial	Hazardous process areas	Extreme-pressure hazardous service

*Temperature capability is application-dependent and may require optional configurations.

Series Descriptions & When to Use Each

N Series – Non-Explosion-Proof Flow Switch

Best choice for non-hazardous locations up to 600 PSI

Choose the N Series when your application does not require explosion-proof protection but still demands reliable, accurate, flow-based switching.

Ideal for:

• General industrial process control
• Utilities and water systems
• HVAC and ventilation systems
• Non-hazardous chemical and fluid handling

E Series – Explosion-Proof Flow Switch

Best choice for hazardous locations up to 600 PSI

The E Series is designed for hazardous environments where explosion-proof construction is required but pressures remain within standard industrial ranges.

Ideal for:

• Chemical and petrochemical processing
• Refineries
• Pharmaceutical manufacturing
• Hazardous gas or vapor environments
• Safety interlocks and alarms

H Series – High-Pressure Explosion-Proof Flow Switch

Required choice for pressures above 600 PSI

The H Series is PEECO’s ultra-high-pressure solution, engineered specifically for applications where pressure exceeds the limits of bellows-based designs. It utilizes a solid rod and flexure tube assembly, successfully field-tested up to 10,000 PSI.

Ideal for:

• High-pressure chemical injection systems
• Refinery and petrochemical processes
• Hydraulic systems
• Power generation
• Military and government installations
• Any application exceeding 600 PSI

Simple Selection Rule

• Non-hazardous area + ≤600 PSI → N Series
• Hazardous area + ≤600 PSI → E Series
• Any application >600 PSI → H Series

One Common Advantage Across All Series

• Flow-actuated (not pressure-based)
• Custom engineered per application
• Fully field adjustable
• Minimal pressure drop
• Inherently leak-proof (no packing glands)
• Long service life with exceptional repeatability

No matter the pressure, temperature, or environment, there is a PEECO flow switch designed for the job.