EFS 1000 Flow Switch: Reliable Flow Monitoring for Fire Protection and Water Systems
In fire protection systems, water installations, irrigation lines and heating or cooling circuits, flow monitoring is essential for system safety and operational reliability. When flow starts or stops, the system must provide a reliable electrical signal for alarms, control panels or equipment protection.
The EFS 1000 Flow Switch Series is designed for detecting flow in pipelines and providing contact output when flow conditions change. With its flexible paddle structure, U-Bolt mounting design, adjustable time delay and dual contact output, EFS 1000 offers a practical solution for fire lines and general liquid flow monitoring applications.
What Is EFS 1000?
EFS 1000 is a flow switch used to detect flow inside pipes. It is designed to provide open or closed contact signals when flow starts or stops.
These contact signals can be used to protect electrical equipment and send fault information to a system. In fire protection systems, one contact can be used for a visual or audible alarm, while the other contact can send a signal to the fire control panel.
The product family includes pipe-size-based models such as EFS 1050, EFS 1065, EFS 1080, EFS 1100, EFS 1125, EFS 1150 and EFS 1200.
Operating Principle
EFS 1000 works with a flexible paddle positioned in the pipeline. When liquid flows through the pipe, it moves the paddle. This movement changes the internal switch position and provides contact output.
When the flow stops or changes, the paddle returns and the contact status changes accordingly.
The device includes a protective cover, removable cable cover, nut, washer, U-Bolt and flexible paddle. This structure allows the switch to be mounted directly onto suitable pipe sizes.
Adjustable Time Delay
One of the key features of EFS 1000 is its adjustable time delay. The catalog states that the time delay is adjusted with a dial mechanism.
The delay time range is 60 to 90 seconds. The adjustment screw is factory-set before shipment, but users can change the setting according to the application.
This time delay helps prevent false alarms caused by short-term flow fluctuations, pressure changes or transient flow movements.
Dual Contact Output
EFS 1000 has dual contact output. The contact rating is 2 x 10 A at 125 / 250 VAC and 2.5 A at 6 / 12 / 24 VDC.
The catalog wiring diagram shows two separate switches with NO, NC and COM terminals. One switch can be used for a visual or audible alarm, and the other switch can send the signal to the fire control panel.
This dual output structure is especially useful in fire protection applications where both local warning and panel communication may be required.
Technical Specifications
EFS 1000 has a working pressure of 31 bar / 450 PSI and a test pressure of 62 bar / 900 PSI.
The working temperature range is 4.5 °C to 50 °C, equivalent to 40 °F to 120 °F.
The nominal pipe diameter range covers DN50 to DN200, corresponding to 2" to 8" pipe sizes.
For DN50 and DN65, the required pipe hole diameter is 33.0 ± 2.0 mm. For DN80 to DN200, the required pipe hole diameter is 50.8 ± 2.0 mm.
The U-Bolt torque value is 20 ft-lb / 27 Nm.
Model Options by Pipe Size
The EFS 1000 series is ordered according to line diameter.
EFS 1050 is used for DN50 / 2" pipes.
EFS 1065 is used for DN65 / 2½" pipes.
EFS 1080 is used for DN80 / 3" pipes.
EFS 1100 is used for DN100 / 4" pipes.
EFS 1125 is used for DN125 / 5" pipes.
EFS 1150 is used for DN150 / 6" pipes.
EFS 1200 is used for DN200 / 8" pipes.
This model structure makes product selection simple and directly linked to the pipe diameter.
Application Areas
The EFS 1000 series is suitable for fire installations, irrigation systems, low-viscosity oils and acids, heating and cooling systems, and water installations.
It can be used with non-corrosive liquid fluids. In fire protection systems, it can detect water flow and provide a signal for alarm or control panel indication.
Its U-Bolt mounting structure and adjustable delay make it practical for fire lines and large pipe installations.
Installation Requirements
The catalog includes important installation warnings. Before installation, the operating instructions must be read. Installation must be carried out by qualified and experienced personnel according to national and international regulations.
Before starting installation, the electrical power supply must be disconnected.
The arrow direction on the flow switch must be installed in the same direction as the water flow. Otherwise, the product will not operate correctly.
The installation line should include a strainer, and the water flow should be free from dirt and debris.
For fire protection systems, the pipe material and wall thickness must comply with international fire installation regulations such as NFPA 13.
Mechanical Installation
To install the flow switch, a hole suitable for the pipe diameter must be drilled into the pipe.
The flexible paddle is bent and inserted into the hole. Then the U-Bolt is placed around the pipe and the switch is mounted using nuts and washers with the correct tightening torque.
This mounting method allows the switch to be installed securely on different pipe sizes.
Dimensional Information
The catalog provides dimensional data for each nominal pipe diameter.
For DN50, dimension A is 125 mm, B is 68 mm and pipe outside diameter is 51.3 mm.
For DN65, dimension A is 125 mm, B is 68 mm and pipe outside diameter is 63 mm.
For DN80, dimension A is 146 mm, B is 87.5 mm and pipe outside diameter is 77.8 mm.
For DN100, dimension A is 173 mm, B is 88 mm and pipe outside diameter is 100 mm.
For DN125, dimension A is 218 mm, B is 90 mm and pipe outside diameter is 129.7 mm.
For DN150, dimension A is 238 mm, B is 90 mm and pipe outside diameter is 152.3 mm.
For DN200, dimension A is 178 mm, B is 90 mm and pipe outside diameter is 208.1 mm.
These values help installers check mechanical compatibility before installation.
Electrical Connection
For electrical connection, the red protective cover is removed using the special key supplied in the box.
After the cover is removed, the NO, NC and COM sections connected to two separate switches can be accessed.
One switch can be used to activate a visual or audible alarm. The other switch can be used to send a signal to the fire control panel.
The removable cable cover should be used for proper cable arrangement. After wiring is completed, the switch output must be checked to verify that the required signals are being received.
After adjustment and wiring are completed, the red protective cover must be closed.
Periodic Maintenance and Testing
The catalog recommends monthly periodic checks.
During inspection, the test and drain valve on the line should be moved to the test position to verify whether the product provides a signal and whether there is any leakage.
Products with leakage or signal problems should not be used.
This regular maintenance procedure is especially important in fire protection systems where reliability is critical.
Advantages of EFS 1000
EFS 1000 provides several important advantages for industrial users and fire system installers.
It has adjustable time delay, dual contact output and U-Bolt mounting. It is also suitable for fire lines.
The device can provide alarm and control panel signals and helps protect electrical equipment by detecting flow changes.
Why Choose EFS 1000?
EFS 1000 is a strong choice when reliable flow detection is required in fire protection and water systems.
Its flexible paddle structure, dual switch output, adjustable delay, U-Bolt connection and compatibility with DN50 to DN200 pipes make it practical for a wide range of installations.
For fire systems, irrigation lines and water-based installations, EFS 1000 provides a dependable flow signal for alarm and control purposes.
Conclusion
The EFS 1000 Flow Switch Series is a reliable solution for detecting flow in pipelines and providing electrical contact output when flow starts or stops. With 31 bar working pressure, 62 bar test pressure, 60–90 second adjustable time delay, dual 10 A contact output, U-Bolt mounting and pipe size options from DN50 to DN200, it is well suited for fire installations, irrigation systems, heating and cooling systems, water installations and low-viscosity liquid applications.
By supporting local alarm output and fire control panel signaling, EFS 1000 helps improve system safety, monitoring reliability and operational protection.