PEECO E Series Flow Switch

E Series Flow Switch

Explosion-Proof Flow-Actuated Switching for Hazardous Locations

Up to 600 PSI | Liquid or Gas Service

The PEECO E Series Flow Switch is a rugged, explosion-proof, flow-actuated electrical switch engineered for hazardous location service where safety, reliability, and precision are non-negotiable. Designed for liquid or gas applications, the E Series operates at pressures up to 600 PSI and is custom-built to meet your exact process requirements.

Unlike off-the-shelf flow switches, every PEECO E Series unit is application-specific, ensuring accurate actuation, minimal dead band, and dependable operation in demanding industrial environments.

Engineered for Hazardous Locations

The PEECO E Series is a true explosion-proof design, exceeding all applicable UL Code requirements and meeting Class I, Group D standards for use in hazardous locations.

• Heavy-duty, industrial construction
• Designed to safely contain any internal explosion
• Proven reliability in severe service environments

Each of the four basic E Series styles can be adapted to a wide range of fittings, piping arrangements, and installation configurations.

Heavy-Duty Explosion-Proof Construction

• 1/4″ thick heat-treated aluminum cover
• Five fully engaged threads to encapsulate internal explosions
• Housing and cover made from 356-T6 heat-treated aluminum
• Epoxy-coated for enhanced corrosion resistance and long service life
• Conduit outlet: 1/2″ FNPT standard
  • 3/4″ FNPT and metric sizes available

This construction provides superior mechanical strength, environmental protection, and long-term durability in hazardous process areas.

Actuated by Flow — Not Pressure

PEECO E Series flow switches are true flow-actuated devices, eliminating the inaccuracies common with pressure-based switches.

• Flow is detected by fluid velocity, not static pressure
• 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

The result is precise, repeatable switching even in fluctuating process conditions.

Mechanical Precision & Leak-Proof Design

The desired flow condition—increase, decrease, or reverse flow—is transmitted mechanically from the process media:

1. Flow deflects the paddle in the line
2. Motion is transferred through the stem and bellows assembly
3. Micro-switch is actuated
4. Electrical signal is sent to the control system, alarm, or interlock

The bellows assembly is seamless 321 stainless steel, silver-brazed or welded per specification, making the E Series inherently leak-proof without packing glands or stuffing boxes.

• Base stem travel: 1/4″
• Micro-switch travel: approximately 0.005″

This design delivers high sensitivity with excellent mechanical durability.

Extreme Operating Capability

• Temperature: From -450°F to +1,500°F (application dependent)
• Pressure: From high vacuum service up to 600 PSI
• Line sizes: From 1/16″ to 12″ and larger

Few flow switches offer this combination of explosion-proof protection and wide operating range.

Common Options

• DPDT micro-switch
• Reverse flow actuation
• High-temperature configurations
• Low-flow sensitivity
• Duct-mounted versions

Typical Applications

• Chemical and petrochemical processing
• Refineries and hazardous gas systems
• Power generation facilities
• Pharmaceutical manufacturing
• Industrial automation and fluid management
• Safety interlocks and alarm systems

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 (3/4″ and metric available)
• Maximum Pressure: 600 PSI (41 bar)
• Maximum Temperature: 300°F (148°C) standard

E Series vs. Standard 300°F Flow Switches

Feature	Standard Flow Switch	PEECO E Series Flow Switch
Hazardous Location Rating	❌ Not rated	✔ Class I, Group D explosion-proof
Actuation Method	Often pressure-based	True flow-actuated
Maximum Pressure	Typically ≤ 300 PSI	Up to 600 PSI
Custom Engineering	Fixed, off-the-shelf	Built per application
Leak Prevention	Packing glands or seals	Welded/brazed bellows — leak-proof
Dead Band / Differential	High or undefined	<10% make/break differential
Environmental Protection	Basic enclosure	Heavy-duty explosion-proof housing
Adjustability	Limited	Fully field adjustable
Suitability for Hazardous Areas	❌ Not suitable	✔ Designed specifically for hazardous locations
Engineering Support	Minimal or none	Included at no cost

The Advantage

Standard flow switches are not designed for hazardous environments and often fail due to leakage, inaccurate actuation, or insufficient protection. The PEECO E Series Flow Switch combines explosion-proof safety, precision flow detection, and rugged industrial construction—making it the trusted choice where safety and reliability are critical.

Available PEECO Models