Mcdonnell&Miller
0 ratings
McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
genuine image
McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
Used for starting or stopping electrically operated equipment. Sealed Monel Bellow. Four stainless steel paddles included: 1, 2, 3 & 6.
McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch
Item #: 402234

McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

Item #: 402234

OMR 96

Price Details

Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )

*All items will import from US

0 ratings Write a review
In stock
us Imported from USA store

QTY:

Order now and get it around Saturday, August 08
Secured transactionsecured transaction

Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.

Our Top Logistics Partners
  • fedex
  • dhl
  • aramex
Used for starting or stopping electrically operated equipment. Sealed Monel Bellow. Four stainless steel paddles included: 1, 2, 3 & 6.
U-Care Warranty:
None
Select a Plan
fast shipping

Fast
Shipping

free return

Free
Return*

secure packaging

Secure Packaging

100% original products

100% Original Products

pci-dss

PCI DSS Compliance

iso certified

ISO 27001 Certified

paypal payment
visa payment
mastercard payment
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.

What Stands Out

Reliable Performance
Ensures consistent operation by accurately detecting liquid flow rates, preventing potential system failures and maintaining efficient process control across various applications.
Versatile Compatibility
Designed to work seamlessly with multiple liquids, making it suitable for diverse industrial applications while reducing the need for various switches.
Durable Construction
Built with high-quality materials that withstand tough environments, providing long-lasting durability and reducing maintenance costs over time.

Product Details

Get the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch at Ubuy Oman. Perfect for electrically operated equipment. Shop now!
Package Weight2.16 Pound

Who Should Buy?

Suitable For
  • HVAC Systems

    Ideal for HVAC professionals needing reliable flow detection to optimize system performance and prevent equipment damage.

  • Industrial Applications

    Well-suited for various industrial processes where liquid flow monitoring is crucial for operational efficiency and safety.

  • Water Treatment

    Effective for water treatment facilities requiring precise flow measurement to ensure proper chemical dosing and system integrity.

Not Suitable For
  • High Viscosity Fluids

    Not suitable for fluids with high viscosity that could impede the functionality of the flow switch.

Product Description

McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch

Have any Query? Chat with us

Product Buying Guide

The McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch is a versatile device designed for starting or stopping electrically operated equipment. It is commonly used for signal lights, alarms, motors, automatic burners, and metering devices. With its easy flow adjustment and durable stainless steel paddles, this flow switch offers reliability and convenience. Read on to learn more about its specifications, key features, usage scenarios, competitors, user reviews, price analysis, buying considerations, and conclusion.

Product Specifications

  • Connection: 1 NPT
  • Temperature Range: 32°F to 300°F
  • Sensitivity Adjusting Screw: Yes
  • Included Paddles: 1, 2, 3 & 6 (25, 50, 80, & 150mm)
  • Electrical Knock-outs: 2

Key Features

  • Versatile flow switch for starting or stopping electrically operated equipment
  • Suitable for signal lights, alarms, motors, automatic burners, and metering devices
  • Easy flow adjustment with sensitivity adjusting screw
  • Includes four stainless steel paddles for customization
  • 1 NPT connection with two electrical knock-outs for flexible installation

Usage Scenarios

  • Controlling the activation of signal lights or alarms
  • Starting or stopping motors in industrial settings
  • Operating automatic burners for heating systems
  • Controlling the flow rate of metering devices

Usage Scenarios

  • Brand X Liquid Flow Switch
  • Brand Y General Purpose Flow Switch

Some User Review

  • I have been using the McDonnell & Miller FS4-3 flow switch in my industrial facility for the past year, and it has performed flawlessly. The sensitivity adjustment feature makes it easy to fine-tune the flow settings, and the included stainless steel paddles allow for customization. Highly recommend!
  • This flow switch is a game-changer for our heating system. It allows us to control the automatic burners with precision, ensuring optimal performance and efficiency. The 1 NPT connection and electrical knock-outs make installation a breeze. Great product!
  • I purchased the McDonnell & Miller FS4-3 flow switch for my metering device, and it has exceeded my expectations. The flow adjustment screw is incredibly handy for maintaining the desired flow rate. The paddles provided are also of high quality. Very satisfied with this purchase.

Competitors

  • The price of the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch is competitive compared to its competitors in the market.
  • Considering its durability and performance, the product offers good value for its price range.
  • It is always recommended to compare prices from different retailers to find the best deal.

Buying Considerations

  • Check the compatibility of the flow switch with your specific equipment and application.
  • Ensure that the flow switch meets the temperature requirements of your system.
  • Read user reviews and consider the feedback from other customers who have used the product.
  • Compare prices from different retailers to find the best deal and ensure a competitive price.

Conclusion

The McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch is a reliable and versatile device for controlling the flow of liquid in various applications. With its easy flow adjustment, customizable stainless steel paddles, and flexible installation options, it offers convenience and efficiency. Consider the specifications, user reviews, and buying considerations to make an informed purchase decision. Whether you need to control signal lights, alarms, motors, burners, or metering devices, this flow switch is a valuable addition to your equipment.

Customer Questions & Answers

  • Question: What is the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch used for?

    Answer: The McDonnell & Miller FS4-3 Liquid Flow Switch is designed for monitoring liquid flow in a variety of applications. It triggers alarms or controls equipment when the flow rate drops below a predetermined threshold, making it vital for systems that require precise liquid management. Industries such as HVAC, water treatment, and boiler systems frequently utilize this device to ensure proper functionality and prevent damage caused by inadequate flow.
  • Question: What types of liquids can the McDonnell & Miller FS4-3 accommodate?

    Answer: The FS4-3 is suitable for use with water and various other non-corrosive liquids. Using it in applications with fluids that match its compatibility specifications is essential to ensure safe and effective operation. It is commonly used in cooling towers, boilers, and industrial processes where monitoring of liquid flow is critical.
  • Question: How does the McDonnell & Miller FS4-3 work?

    Answer: The FS4-3 operates using a paddle that detects liquid flow within a pipeline. When the flow rate is adequate, the paddle remains in a designated position, keeping the electrical contacts closed. If the flow diminishes below a set level, the paddle moves, opening the contacts and triggering alarms or control actions. This simple yet effective mechanism provides real-time monitoring and enhances operational safety.
  • Question: Can the FS4-3 be used in outdoor applications?

    Answer: Yes, the McDonnell & Miller FS4-3 can be installed outdoors if it is properly housed in a weatherproof enclosure. This ensures protection from environmental elements, prolonging its lifespan and maintaining its reliability. Common applications include outdoor cooling systems and irrigation setups, where monitoring flow is crucial for system efficiency.
  • Question: What is the fitting size for the FS4-3 Liquid Flow Switch?

    Answer: The FS4-3 features a standard 3/4-inch NPT (National Pipe Thread) fitting size. This compatibility allows for easy integration into existing pipework systems without the need for specialized adapters. Its universal fitting makes it ideal for various industrial and commercial applications requiring straightforward installation.
  • Question: Is the FS4-3 adjustable for different flow rates?

    Answer: Yes, the McDonnell & Miller FS4-3 allows for adjustable settings to cater to different flow rates. The adjustment process is straightforward, typically involving a screw mechanism that you can calibrate to meet specific operational needs. This enables users to customize the switch for particular systems, ensuring efficient operation based on varying flow requirements.
  • Question: What safety features does the FS4-3 provide?

    Answer: The FS4-3 includes several safety features designed to prevent equipment damage and ensure reliable operation. These features include automatic shut-off control for essential systems and alarm outputs that alert operators when flow levels are insufficient. This makes it a valuable component in safeguarding sensitive equipment like pumps and boilers from potential failures.
  • Question: How do I install the McDonnell & Miller FS4-3?

    Answer: Installation of the FS4-3 involves connecting it into the pipeline at the desired location. It is crucial to follow manufacturer instructions, ensuring that the flow switch is oriented correctly according to the flow direction. Tools required include basic plumbing tools for cutting and sealing. Proper installation minimizes leaks and maintains the efficiency of the liquid monitoring system.
  • Question: Where can I buy the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch?

    Answer: You can purchase the McDonnell & Miller FS4-3 General Purpose Liquid Flow Switch from Ubuy. Ubuy provides a convenient platform to explore, select, and acquire the FS4-3, ensuring a seamless shopping experience. With product information and details readily available, you can make informed decisions for your liquid flow monitoring needs.

Mcdonnell&Miller Flow Switches Editorial Review

No editorial reviews found

Customer Reviews & Ratings

5.0
1 customers ratings
  • 5 Star
    100%
  • 4 Star
    0%
  • 3 Star
    0%
  • 2 Star
    0%
  • 1 Star
    0%

Review this product

Share your thoughts with other customers

Platform Trust & Buyer Confidence

trustpilot logo
4.3/5 9200 + reviews
Read reviews
MA
Mohammad
Verified buyer

“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”

23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer

“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”

22-Jul-26 · via Trustpilot
K
kund
Verified buyer

“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”

23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer

“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”

22 July 2026 · via Trustpilot
SJ
SAO JOHN
Verified buyer

“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”

23 July 2026 · via Trustpilot
Secure Checkout Global Delivery Easy Returns Genuine Products

Product Price History

Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
  • Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

OMR 96

Order now and get it around Saturday, August 08

QTY:

Secured transactionsecured transaction

PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.

Our Top Logistics Partners
  • fedex
  • dhl
  • aramex
Fastest cross-border delivery

Features & Benefits

  • For starting or stopping electrically operated equipment
  • Sealed Monel Bellow
  • Sensitivity adjusting screw makes flow adjustment easy
  • Four stainless steel paddles included: 1, 2, 3 & 6.

Ubuy Assurance

Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.