Product Description
The McDonnell & Miller Series FS1 is a high sensitivity in-line liquid flow switch designed for general purpose applications requiring precise detection of low to moderate flow rates, including air conditioning, heating, hydronic systems, water, fuel oil, and process fluids. It features a 1/2" NPT in-line connection that eliminates the need for a pipe tee, a single pole double throw (SPDT) snap-action switch, and a fully sealed switch compartment to protect it from liquid contact. A sensitivity adjusting screw allows for easy on-site flow adjustment within the specified range.
Technical Specifications
| Specification | Value |
|---|---|
| Brand | McDonnell & Miller |
| Model / Part Number | FS1 Flow Switch |
| Manufacturer Part Number (MPN) | 113200 |
| Series | FS1 |
| Type | High Sensitivity Liquid Flow Switch |
| Switch Type | Single Pole, Double Throw (SPDT) Snap Switch |
| Voltage | 120/240 VAC |
| Frequency | 50/60 Hz |
| Full Load Amps (120 VAC) | 7.4 A |
| Full Load Amps (240 VAC) | 3.7 A |
| Locked Rotor Amps (120 VAC) | 44.4 A |
| Locked Rotor Amps (240 VAC) | 22.2 A |
| Pilot Duty Rating | 125 VA at 120 or 240 VAC |
| Pipe Connection Size | 1/2" NPT |
| Connection Type | In-Line (Threaded x Threaded) |
| Flow Rate — Minimum (Flow Setting) | 0.41 GPM (1.55 LPM) |
| Flow Rate — Maximum (Flow Setting) | 1.81 GPM (6.85 LPM) |
| Flow Rate — Minimum (No-Flow Setting) | 0.24 GPM (0.91 LPM) |
| Flow Rate — Maximum (No-Flow Setting) | 1.28 GPM (4.84 LPM) |
| Maximum Liquid Pressure | 100 PSI (7 kg/cm²) |
| Maximum Flow Velocity | 10 ft/sec (3 m/sec) |
| Liquid Temperature Range | 32°F – 225°F (0°C – 107°C) |
| Ambient Temperature Range | 32°F – 120°F (0°C – 49°C) |
| Enclosure Rating | NEMA 1 (IP 21) |
| Applicable Standards | UL Listed (Canada and US) |
| Overall Dimensions (W x H) | 3-13/16" W x 4-7/16" H |
| Overall Dimensions (L x W x H) | 5.05" x 7.3" x 4.3" |
| Weight | 3.09 lbs |
| Application | HVAC, Hydronic Systems, Air Conditioning, Heating, Water, Fuel Oil, Process Liquids |
| Manufacturer | McDonnell & Miller (a Xylem brand) |
We warranty all items for 30 days from date of purchase.
Other Details
We warranty all items for 30 days from date of purchase. If you experience any issues with your item within this period, please contact us and we will work with you to resolve the problem. This warranty covers defects in functionality but does not cover damage caused by misuse, improper installation, or normal wear and tear.Product Videos
Custom Field
GTIN 679523686185
Sensor Type In-Line Paddle / Snap-Action
Country/Region of Manufacture USA
Full Load Amps 7.4A @ 120VAC / 3.7A @ 240VAC
Manufacturer Mcdonnell
Enclosure Type NEMA 1 (IP 21)
Part Number FS1 FLOW SWITCH
Shelf K-32
Model FS1 FLOW SWITCH
MPN FS1 FLOW SWITCH
Type Flow Sensor
