Flange&Groove Flow Switch
The special flow switch for fire water adopts the speed difference method, which is designed for urban water supply duct, firefighting and subway measurement table, solves the problem of non-measurement of traditional flow meter with high starting flow rate and small flow rate, and is suitable for a variety of industrial sites.
Overview
When used as a flow switch, the alarm flow signal can be set at will through the data communication interface. When the flow rate of the flow meter is greater than the set flow rate value, an open signal will be output to be connected to the power switch of the motor to achieve the purpose of opening the pump. When the flow rate is less than the set flow rate value, a turn signal will be output to turn off the motor power supply to achieve the purpose of turning off the pump. Using ultrasonic flow measurement technology, diameter pipe body design, no pressure loss, no mechanical turning parts, reducing corporate water supply costs. High reliability, measurement is not interfered by magnets. It has a variety of output functions and is equipped with wireless transmission, which can form a monitoring system to monitor the operation of the instrument and the operating status of the pipe network. The special flow switch for fire water reserves a pressure sensor detection interface, which can also achieve the function of opening and stoping pump when the pressure changes.
Working PPrinciple
Fire flow switch, based on the principle of thermal, two resistors are included in the closed probe, one of which is heated as a detection resistor, the other is not heated as a reference resistor, when the medium flows, the flow on the heating resistor is taken away, the resistance value is changed, and the two resistance difference is used as the basis for judging flow rate.
Product Features
No movable parts, maintenance-free, easy installation, one model is suitable for a variety of pipe diameter requirements. Continuously adjustable switching volume, extremely low pressure loss, compact structure. Led displays flow trends and switch status. It is suitable for pipe diameter dn50~dn100. the length of the probe rod is determined according to the pipe diameter.
Technical Specifications
| Nominal diameter | DN20~DN300 |
| Measure fluid | Water,homogeneous liquid,and full of pipes |
| Accuracy | Level 2 |
| Withstand pressure | 1.6MPa |
| Working environment | Temperature:-10~45℃Humidity:≤100%rh |
| Pressure loss | ≤0.025MPa |
| Temperature level | T30 |
| Working power supply | 220v ac or 24v dc |
