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3G Electric
Mcdonnell & Miller Series FS1 High Sensitivity Liquid Flow Switches
Mcdonnell & MillerFlow Switches

Mcdonnell & Miller Series FS1 High Sensitivity Liquid Flow Switches

McDonnell & Miller Flow Switches.

SKU 3G-OTH-02752

Brand
Mcdonnell & Miller
Item
Series FS1 High Sensitivity Liquid Flow Switches
Part Number
FS1
Category
Flow Switches
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Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
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Mcdonnell & Miller Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

McDonnell & Miller Flow Switches.

Frequently Asked Questions

What is the McDonnell & Miller FS1 flow switch used for?

The McDonnell & Miller FS1 flow switch detects liquid flow or no-flow in piping systems. It is commonly used in HVAC, boiler, and industrial process applications to interlock pumps, alarms, or burners when flow is present or lost.

What are the specifications of the McDonnell & Miller FS1 flow switch?

The FS1 features a 1/2" NPT connection, high flow capacity, and an in-line configuration that eliminates the need for a pipe tee. It includes a single-pole, double-throw snap switch and a sealed switch compartment for reliable operation.

Where to buy the McDonnell & Miller FS1 in Singapore?

You can source the McDonnell & Miller FS1 flow switch through 3G Electric in Singapore. We handle logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this item.

How to install the McDonnell & Miller FS1 flow switch?

Install the FS1 in a horizontal pipe with the flow arrow aligned to flow direction. Use a 1/2" NPT fitting and ensure the switch is wired per the SPDT contact rating. Follow standard piping practices and verify flow before commissioning.

Used in

Common applications for Mcdonnell & Miller
Steam boiler low-water cutoff — McDonnell & Miller inline flow switches (e.g., FS-1) for automatic burner shutdown
Cooling water flow monitoring — McDonnell & Miller insertion-style switches (e.g., FS4-3D) in large-diameter pipes
Hazardous-area process lines — McDonnell & Miller FS7-4E with NEMA 7/9 enclosure for Class I, Div 1 locations
HVAC chilled water systems — McDonnell & Miller FS6-1 inline switch for pump flow verification
Industrial wastewater treatment — McDonnell & Miller FS4-3S stainless steel switch for corrosive fluid flow detection
Boiler feedwater control — McDonnell & Miller FS8-WJ with BSP connections for international installations
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Mcdonnell & Miller Products

3G Electric supplies Mcdonnell & Miller flow switches. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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