TE CONNECTIVITY Flow Switch, FS Series, 22 mm Port Size, 10 bar, SPST-NO, 250 Vac, 3 A

The TE CONNECTIVITY Flow Switch FS Series is a precision inline flow detection device designed for hydraulic and pneumatic systems requiring reliable fluid movement monitoring at pressures up to 10 bar. This SPST-NO (Single Pole Single Throw Normally Open) switch integrates seamlessly into industrial automation, HVAC systems, and process control applications where flow verification is critical for operational safety and efficiency. The switch solves the problem of undetected flow starvation, system blockages, and pump failures by providing instantaneous electrical signal generation when fluid velocity meets or exceeds the preset threshold.

Product Overview

The TE CONNECTIVITY FS Series Flow Switch operates on the principle of turbine or paddle wheel detection, where fluid flow causes internal mechanical movement that triggers the electrical contact closure. The 22 mm port size accommodates standard industrial piping connections, making integration straightforward into existing hydraulic circuits. At 10 bar maximum operating pressure, this switch is engineered for mid-range industrial applications including cooling water systems, lubrication circuits, and secondary hydraulic loops where cost-effectiveness meets reliability requirements. The SPST-NO configuration means the switch contacts are normally open and close only when flow is detected, providing fail-safe operation in critical monitoring scenarios.

The 250 Vac, 3 A electrical rating enables direct connection to standard industrial control circuits without additional relay interfaces for most applications. This model features robust construction with stainless steel or corrosion-resistant internals, ensuring extended service life in demanding environments. The switch provides repeatable, hysteresis-controlled switching behavior, minimizing nuisance trips from flow turbulence while maintaining sensitivity to genuine flow cessation. Installation is straightforward with standard NPT or ISO port threads, and the compact design allows retrofit into space-constrained applications without extensive system modifications.

Key Specifications

Specification	Details
Product Type	Inline Flow Switch
Brand	TE CONNECTIVITY
Series	FS Series
Port Size	22 mm
Maximum Pressure Rating	10 bar (145 psi)
Contact Configuration	SPST-NO (Single Pole Single Throw Normally Open)
Electrical Rating	250 Vac, 3 A
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Flow Range	Adjustable threshold typically 0.5 to 5 GPM depending on fluid type
Operating Temperature	-10 to 60 degrees Celsius standard range
Connection Type	NPT or ISO threaded ports
Housing Material	Aluminum or ductile iron with corrosion protection

Key Features

• SPST-NO Contact Configuration: Normally open contacts close only during flow detection, providing inherent fail-safe operation and eliminating false alarms from pressure spikes without flow
• 22 mm Port Size: Compatible with standard industrial piping systems, reducing integration costs and installation complexity in existing hydraulic and pneumatic networks
• 10 bar Pressure Rating: Suitable for mid-range industrial applications including cooling circuits, secondary hydraulic systems, and lubrication monitoring without overpressure concerns
• 250 Vac, 3 A Electrical Capacity: Direct integration with standard industrial control panels and PLC inputs without requiring additional relay modules or power conditioning
• Hysteresis-Controlled Switching: Adjustable flow threshold with built-in hysteresis prevents nuisance tripping from fluid turbulence while maintaining sensitivity to genuine flow loss conditions
• Corrosion-Resistant Construction: Stainless steel or protected aluminum housing ensures extended service life in harsh industrial environments with moisture, chemical exposure, or temperature fluctuations
• Compact Design: Space-efficient form factor enables retrofit installation in confined spaces without requiring extensive system reconfiguration or downtime
• Repeatable Performance: Precision-engineered internal mechanisms deliver consistent switching behavior across thousands of operational cycles with minimal drift

Applications and Use Cases

• Hydraulic System Protection: Monitor cooling water flow in industrial hydraulic power units to detect pump cavitation, filter blockages, or line ruptures before catastrophic system failure occurs
• HVAC Chilled Water Verification: Confirm continuous chilled water circulation in commercial building cooling loops, triggering alarms when flow drops below minimum levels indicating pipe freezing or pump failure
• Industrial Lubrication Monitoring: Supervise bearing and spindle lubrication oil flow in manufacturing equipment, automatically shutting down machinery when oil delivery fails to prevent bearing seizure and production loss
• Process Control Systems: Integrate into food processing, pharmaceutical, and chemical manufacturing applications where fluid flow verification is required for batch integrity, safety compliance, and product quality assurance
• Fire Suppression System Supervision: Monitor water flow in sprinkler systems and fire pump discharge lines, providing immediate electrical signal to alarm panels when flow is interrupted or system pressure drops
• Pneumatic Tool Supply Networks: Detect air line blockages or compressor failures in industrial pneumatic systems, preventing tool malfunction and worker safety issues in manufacturing facilities

How to Use

Installation begins with selecting the appropriate port orientation based on your system's flow direction and ensuring the 22 mm threaded ports align with existing piping connections. Use thread sealant tape or compatible pipe dope on NPT connections to prevent leakage, then hand-tighten followed by wrench tightening to firm resistance without over-torquing, which can damage the housing. Mount the switch in a vertical or horizontal orientation as specified in your system design, ensuring the internal paddle wheel or turbine can rotate freely without obstruction from debris or sediment. Before pressurizing the system, verify that the electrical connections match your control panel voltage requirements (250 Vac) and that the 3 A contact rating is adequate for your load, using a relay if higher current is needed.

Once installed, adjust the flow threshold using the integrated adjustment mechanism to match your system's minimum required flow rate, typically set 10-15 percent above normal operating flow to prevent nuisance trips. Connect the NO (normally open) contact terminals to your PLC input or alarm circuit, ensuring proper polarity and using shielded cable for EMI-sensitive environments. Perform a commissioning test by gradually increasing system pressure and flow, confirming that the switch contact closes at the preset threshold and remains stable during normal operation. Establish a maintenance schedule to inspect the switch quarterly for debris accumulation, corrosion, or mechanical wear, and flush the system if sediment buildup is observed. Document the switch settings and calibration data for future reference and troubleshooting purposes.

Frequently Asked Questions

What is the difference between SPST-NO and SPDT flow switch configurations?

SPST-NO (Single Pole Single Throw Normally Open) switches have one contact pair that remains open until flow is detected, then closes to complete a circuit. SPDT (Single Pole Double Throw) switches have two contact pairs, allowing simultaneous control of normally open and normally closed circuits. The FS Series SPST-NO configuration is ideal for fail-safe applications where you want the alarm or shutdown circuit to activate only when flow is present, preventing false alarms from electrical noise or power fluctuations.

Can this flow switch handle mineral oil, synthetic hydraulic fluid, and water-based coolants?

Yes, the TE CONNECTIVITY FS Series is compatible with standard mineral oils, synthetic hydraulic fluids (ISO VG 32-68), and water-based coolants commonly used in industrial applications. The corrosion-resistant housing and internal components are engineered to resist degradation from these fluid types. However, avoid using the switch with highly viscous fluids above ISO VG 100 or specialty fluids containing aggressive solvents without consulting TE CONNECTIVITY technical documentation, as these may affect switching sensitivity or seal longevity.

What flow rate range does this switch detect, and is it adjustable?

The FS Series typically detects flow rates between 0.5 and 5 GPM depending on fluid viscosity, temperature, and system pressure. The switch features an adjustable threshold mechanism allowing you to set the minimum flow rate at which contacts close, usually with a range of plus or minus 20 percent from the factory preset. Heavier fluids require higher flow velocities to trigger the switch, while lighter fluids may trigger at lower velocities. Consult the product datasheet for your specific fluid type to determine the appropriate adjustment range.

Is this switch suitable for high-temperature applications above 60 degrees Celsius?

The standard TE CONNECTIVITY FS Series is rated for -10 to 60 degrees Celsius. For applications requiring higher temperature operation, contact TE CONNECTIVITY or The Engineer Store to inquire about specialized variants with heat-resistant seals and electronics rated to 80 or 100 degrees Celsius. High-temperature versions may have different part numbers and pricing, so verification before purchase is essential for critical applications.

How do I prevent nuisance trips from pressure spikes without actual flow?

The FS Series incorporates hysteresis control, which requires sustained flow over a minimum time period before contacts close, preventing single pressure spikes from triggering false alarms. During commissioning, adjust the threshold slightly above your normal operating flow rate to provide a safety margin. If nuisance trips persist, verify that your system doesn't have excessive pressure oscillations from pump pulsation or check valve chatter, and consider installing a small accumulator or damping orifice upstream of the switch to smooth pressure transients.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse

Buy TE CONNECTIVITY Flow Switch, FS Series, 22 mm Port Size, 10 bar, SPST-NO, 250 Vac, 3 A Online in India

Purchase the TE CONNECTIVITY Flow Switch, FS Series, 22 mm Port Size, 10 bar, SPST-NO, 250 Vac, 3 A online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.

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