High-Temperature Flow Switches
Reliable Flow Detection for Process Temperatures up to 1,500°F
Power Engineering & Equipment Company (PEECO) High-Temperature Flow Switches are engineered for applications where extreme heat renders conventional flow switches unreliable or unusable. Designed for demanding industrial environments, these flow-actuated electrical switches deliver dependable performance at temperatures up to 1,500°F, where other devices simply fail.
Engineered for Extreme Heat
Standard industrial flow switches are typically limited to 300°F. PEECO offers multiple high-temperature solutions to match your exact process conditions:
- Up to 300°F – Standard PEECO flow switch configuration
- Up to 400°F – Achieved with a high-temperature micro-switch upgrade
- Above 400°F to 1,500°F – Achieved using PEECO’s patented high-temperature body extension system
For elevated temperatures beyond 400°F, PEECO flow switches are supplied with variable-length convoluted stainless steel body extensions featuring integrated finned rings.
Advanced Heat Dissipation Design
The stainless steel finned-ring extensions are engineered to:
- Thermally isolate electrical components from extreme process heat
- Rapidly dissipate heat away from the switch housing
- Preserve switch accuracy and long-term reliability
- Extend service life in continuous high-temperature operation
The number of finned rings is precisely matched to the required maximum temperature rating, ensuring optimal protection without unnecessary bulk or cost.
When paired with PEECO’s high-temperature micro-switch, this design delivers stable, repeatable switching performance at temperatures most flow switches cannot withstand.
True Flow Actuation — Not Pressure
Like all PEECO flow switches, high-temperature models are actuated by flow velocity, not pressure, providing accurate and reliable response even in fluctuating thermal conditions.
- No dependence on pressure differentials
- Reliable detection of flow increase, decrease, or loss
- Fully field adjustable to application requirements
Available Across the PEECO Product Line
PEECO High-Temperature Flow Switches are available in multiple configurations to meet plant standards and code requirements:
- Non-Explosion-Proof Models – For non-hazardous high-temperature environments
- Explosion-Proof Models – For hazardous locations requiring certified protection
- High-Pressure Models – For applications combining extreme temperature and pressure
This flexibility allows a single flow-switch technology to be used across diverse processes and industries.
Typical Applications
- Furnaces and kilns
- Industrial ovens and dryers
- Thermal oxidizers and incinerators
- Hot gas exhaust and combustion air systems
- High-temperature chemical processing
- Power generation and refinery services
Why Choose PEECO High-Temperature Flow Switches?
- Proven operation up to 1,500°F
- Custom-engineered for each application
- Stainless steel finned extensions for superior heat dissipation
- Compatible with explosion-proof and high-pressure designs
- Flow-actuated for accuracy and reliability
- Designed for long service life in extreme environments
When process temperatures exceed the limits of conventional instrumentation, PEECO High-Temperature Flow Switches deliver dependable performance where others fail.
Available on our Series N Flow Switch – these units are furnished with a slip-on steel cover. This .062 thick housing is NEMA 4X weather proof, by utilizing a special “O” ring seal fitted into a mechanical groove in the body; a standard on all of the non-explosion proof models. The housing & cover are both made of heat treated aluminum T-356 and are epoxy coated (for extra protection). Each of the four basic styles shown are adaptable to many other fittings and configurations.
Available on our Series E Flow Switch – All explosion proof models are rugged, heavy duty units exceeding all UL Code requirements. Each of the four basic styles are adaptable to many other fittings and configurations. Utilizing 1/4″ thick Heat treated aluminum cover (shown at right) with 5 fully engaged threads, these units are designed to encapsulate any internal explosion. All explosion proof models meet Class 1, Group D requirements for use in hazardous locations; all NEMA classifications available. The housing & cover are both made of heat treated aluminum T-356 and are epoxy coated (for extra protection). Other classes and groups are available. Conduit outlet: 1/2″ NPT on all models; 3/4″ and metric sizing available.
Available on our Series H Flow Switch – Utilizing ¼” thick Heat Treated aluminum cover with 5 fully engaged threads, all units are designed to encapsulate any internal explosion. In lieu of a bellows assembly a solid rod extends through a flexure tube brazed or welded into a S.S. ball fixture. Unit has been successfully field tested up to 10,000 psi. Wall thickness of the flexure tube will vary with pressure requirements. This model is recommended for all pressures over 600 psi. Each of the four basic styles shown are adaptable to many other fittings and configurations.
| Explosion Proof Models Shown with Optional Heat Dissipation: | |
| All explosion proof models are rugged, heavy duty units exceeding all UL Code requirements. Each of the four basic styles are adaptable to many other fittings and configurations. Utilizing 1/4″ thick Heat treated aluminum cover (shown at right) with 5 fully engaged threads, these units are designed to encapsulate any internal explosion. All explosion proof models meet Class 1, Group D requirements for use in hazardous locations; all NEMA classifications available. The housing & cover are both made of heat treated aluminum T-356 and are epoxy coated (for extra protection). Other classes and groups available. Conduit outlet: 1/2″NPT on all models; 3/4″ and metric sizing available. |  |
| Non-Explosion Proof Models Shown with Optional Heat Dissipation: | |
| Encompassing all the features and reliability of our more popular Explosion Proof models, these units are furnished with a slip-on steel cover. This .062 thick housing is NEMA 4X weather proof, by utilizing a special “O” ring seal fitted into a mechanical groove in the body; a standard on all of the non-explosion proof models. The housing & cover are both made of heat treated aluminum T-356 and are epoxy coated (for extra protection). Each of the four basic styles shown are adaptable to many other fittings and configurations. |  |
| High Pressure Models (10,000psi) Shown with Optional Heat Dissipation: | |
| Utilizing ¼” thick Heat Treated aluminum cover with 5 fully engaged threads, all units are designed to encapsulate any internal explosion. In lieu of a bellows assembly a solid rod extends through a flexure tube brazed or welded into a S.S. ball fixture. Unit has been successfully field tested up to 10,000psi. Wall thickness of the flexure tube will vary with pressure requirements. This model is recommended for all pressures over 600psi. Each of the four basic styles shown are adaptable to many other fittings and configurations. |  |