How do you know if your flow switch is faulty?

If any of the following situations occur, the flow switch may be faulty: the switch does not activate when flow is present, or it does not reset after flow stops; the switch repeatedly turns on and off when flow is stable; the indicator light does not illuminate, or the light’s status does not change when the flow rate changes. Before determining that the switch is faulty, perform the following three checks: Use a multimeter to verify that the power supply is 24 VDC and that the wiring is correct. Clean the probe to remove surface scale and any entanglements. Reset the setpoint under normal flow conditions. The response time for thermal flow switches is 1–13 seconds; a delay of a few seconds is normal. If you have performed all three checks and the switch still does not respond, you can generally conclude that the sensor is damaged and needs to be replaced.

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TS360 Sanitary Flow Switch

Name: TS360 Sanitary Flow Switch
Brand: Sino-Inst
SKU: TS360
Price: 250 USD
Availability: InStock

The TS360 Sanitary Flow Switch is a measuring instrument that provides real-time monitoring of fluid flow in pipelines, along with signal output and control capabilities. The product is constructed from sanitary-grade stainless steel and features a fully enclosed, laser-welded design. Its carefully engineered sanitary probe and collet connection allow for quick and easy disassembly, minimizing the risk of contamination during use and facilitating cleaning and maintenance. In field applications, the switch points can be set on-site based on actual changes in the flow velocity of the medium within the pipe, providing reliable assurance for customers’ process control.

Multiple LED indicators display the flow status and switch status in real time. It can be used to monitor fluid velocity within pipelines, detect flow interruptions, or prevent pumps from running dry. It is widely used in industries with high hygiene requirements, such as food, beverages, pharmaceuticals, hydropower, and industrial hydraulics.

From USD 250.00/pc. The final price depends on display type, process connection, output signal and temperature range.

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Benefits

Features an all-stainless-steel construction with no moving parts or hygiene dead zones;
Provides real-time monitoring of fluid flow within pipelines, along with signal output and control;
Output signals: PNP, NPN, relay, analog (4–20 mA), normally open + normally closed (SPDT);
Waterproof housing design with a unique waterproof adjustment knob for convenient and reliable operation;
Features a unique conical probe design that effectively prevents media entanglement and flow obstruction;
Suitable for various types of pipelines, with the switching threshold continuously adjustable on-site;
Sanitary, high-temperature, and corrosion-resistant models available;
Options include relay switching, analog output, or integrated analog + switching output;

Featured Applications

Used to monitor fluid flow velocity in pipelines, detect flow interruptions, or prevent pumps from running dry.

Widely used in the hydropower industry, industrial hydraulics, and other applications requiring monitoring of fluid flow velocity in pipelines.

Technical Specifications

Measuring range	1–150 cm/s (water), 3–300 cm/s (oil), 20–2000 cm/s (air)
Supply voltage	24 VDC ±20%
Output signal	PNP, NPN, relay, analog (4–20 mA); NO + NC (SPDT)
No-load current	Max. 80 mA
Pressure rating	100 bar
Ambient temperature	–20°C to 80°C
Ingress protection rating	IP67
Response time	1–13 s (typical: 2 s)
Medium temperature	–20°C to 100°C (high-temperature version: –20°C to 120°C)
Inrush current	Max. 1 A, 48 VAC/DC (relay type)
Setting method	Potentiometer adjustment
Flow indication	LED array (6 LEDs), digital display
Housing material	304 stainless steel
Wetted parts material	304, 316.

TS360 Sanitary Flow Switch Dimension Drawing

Order Guide

Code format: TS360 – [Display] [Process Connection] [Output] [Temperature] [Wetted Material]

Item	Code	Description
Display Type	(blank)	Standard: LED bar indicator (6 LEDs)
Display Type	M	LCD display
Process Connection	L1	Threaded, G1/2 male
	L3	Tri-clamp 1.5″ (3A), clamp OD 50.5 mm
	L5	Tri-clamp 2.0″ (3A), clamp OD 64.0 mm
	LX	Custom connection (please specify)
Output Signal	D1	4-20 mA analog output
	D7	Relay switch output
	D8	PNP / NPN transistor output
Temperature Range	W1	-20 to 85 °C (-4 to 185 °F)
Temperature Range	W2	-20 to 120 °C (-4 to 248 °F)
Wetted Material	SS	304 stainless steel
Wetted Material	LL	316 stainless steel

Ordering example:

LED bar display / 1.5″ tri-clamp (OD 50.5 mm) / relay output / standard temperature / 316 wetted parts

Order code: TS360-L3D7W1LL

Notes:

All models are powered by 24 VDC.
For non-standard process connections, add the size after the code, e.g. 25.2 mm clamp: LX (25.2 mm).

FAQ

A flow switch is an automated control device that detects changes in the flow rate of a fluid (such as water, gas, or oil) within a pipeline and triggers a switch signal when a preset threshold is reached.

Flow switches can be installed inline or as insert-type devices to provide equipment protection and process control, preventing equipment from running dry or becoming damaged.

If any of the following situations occur, the flow switch may be faulty: the switch does not activate when flow is present, or it does not reset after flow stops; the switch repeatedly turns on and off when flow is stable; the indicator light does not illuminate, or the light’s status does not change when the flow rate changes.

Before determining that the switch is faulty, perform the following three checks:

Use a multimeter to verify that the power supply is 24 VDC and that the wiring is correct.
Clean the probe to remove surface scale and any entanglements.
Reset the setpoint under normal flow conditions.

The response time for thermal flow switches is 1–13 seconds; a delay of a few seconds is normal. If you have performed all three checks and the switch still does not respond, you can generally conclude that the sensor is damaged and needs to be replaced.

Common types of flow switches include: orifice plate flow switches, thermal diffusion flow switches, electronic flow switches, and piston-type flow switches. For a detailed introduction, please refer to “Types of Flow Switches”.

Flow switches should be installed in a straight section of piping, away from the pump suction inlet and elbows. The orientation should ensure that the medium flows over the probe; avoid installing it upside down or using excessively long connectors.

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Zhang Wei

Zhang Wei, possesses 20 years of experience as an automation instrumentation engineer, specializing in the research, design, installation, commissioning, and maintenance of automation instruments.

Face to various instrument communication protocols (such as Modbus, Profibus, etc.), with solid hardware circuit design and software programming skills (proficient in C language and PLC programming). Has extensive project experience; projects he has led and participated in have all achieved outstanding results, improving product accuracy, reducing costs, and increasing production efficiency.

Possesses excellent communication and coordination skills and a strong team spirit, enabling him to quickly respond to customer needs and provide high-quality automation instrumentation solutions.