2. Baffle-type flow switch does not contain bellows that can easily lead to failure.
3. The electrical components of the baffle flow switch are not in direct contact with metal components with large temperature difference, and the problem of condensed water corrosion of electrical components will not occur.
4. The baffle type flow switch adopts imported magnetic switch as the electrical moving part, which has small open circuit and reset flow.
Installation position The installation position of the baffle flow switch is generally installed on the pipeline from the water outlet of the water pump to the water outlet of the equipment, and it is best not to install it on the pipeline at the suction inlet of the water pump, so that the water pump cannot absorb water normally and the water flow switch cannot be turned on, which requires special attention. The baffle flow switch allows horizontal (wire part at the top) and vertical installation. The gas-liquid dual-purpose type can be widely used in industrial automation/mechanical equipment/air compression industry/refrigeration and air conditioning field, and is specifically used in water-cooled welding machines, laser equipment cooling systems, vacuum coating machines, electric furnaces, polysilicon ingot furnaces and the like in industrial occasions. Water flow switch magnet is not in the running water channel, so it can be used in sewage system and can work normally. Technical parameter △ voltage: 250V (max. )
△ Maximum current and capacity: 1A, 50VA
△ Connection mode: direct wiring.
△ output: SPST magnetic switch (factory set normally open)
△ Pressure resistance: 25bar, optional customized 50bar.
△ Average pressure loss: 0.0 1 bar (maximum flow)
△ Working temperature: -20...90℃ (150℃ can be customized)
△ Enclosure protection grade: IP65
△ material: liquid contact shell: nickel-plated brass
Baffle: beryllium copper alias thermal flow switch, also known as electronic flow switch. Features★ Relay/transistor /4-20mA output
★ No fluid blockage, no pressure drop and no maintenance.
★ Six LEDs display alarm and flow status.
★ Temperature compensation in the whole temperature zone;
★ Switch output and control points can be continuously adjusted on site.
★ Easy installation, the product is suitable for all kinds of pipe diameters;
The flow switch can monitor the liquid flow in the pipeline in real time, provide the switch output, and display the fluid flow in real time with six light-emitting diodes, thus realizing the following monitoring functions:
The medium flows, reducing/increasing the flow rate;
Media presence/absence;
Medium flow/static;
It can be used to monitor the flow rate of the fluid in the pipeline, stop the flow or prevent the pump from idling. It is widely used in all walks of life where it is necessary to monitor the fluid velocity in the pipeline or protect important equipment when the liquid flow fails. Working principle The heat flow switch is designed according to the temperature change principle of the probe. The probe is internally provided with a heating sensor and a thermal sensor which are in contact with the medium. When measuring, the heating sensor emits constant heat. When there is no medium flowing in the pipeline, the heat received by the thermal sensor is a constant value. When a medium flows, the heat received by the thermal sensor will change with the flow rate of the medium. The thermal sensor converts this temperature difference signal into an electrical signal, and then converts it into a corresponding contact signal or an analog signal through a circuit.
The principle of thermal diffusion flow switch, thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. The typical principle is that when two sensing elements are placed in a fluid, one of them is heated and the other is used to sense the process temperature. The temperature difference between the two sensing elements is related to the process flow rate and the properties of the process medium. The temperature difference between the two sensing elements is the largest in the state of no flow, but with the increase of flow, the heated sensing element cools and the temperature difference decreases. Fluid velocity directly affects the degree of heat diffusion. Setting range of technical parameters:1~150cm/s (water), 3 ~ 300m/s (oil) and 20 ~ 3m/s (air).
Signal output: PNP, NPN, relay, analog (4 ~ 20ma).
Power supply: 24V 20%DC
Conduction current: 400 Ma max (PNP or NPN type), 1A@24V ac/dc max (relay type).
No-load current: 80mA max
Flow indication: LED row (6 pieces) setting mode: potentiometer setting.
Pressure range: 100 bar
Medium temperature change: ≤4℃/s
Response time: 1 ~ 13s, with typical value of 2s.
Initialization time: about 8s.
Electrical protection: reverse phase, short circuit and overload protection.
Protection grade: IP67
Medium temperature: -20 ~ 80℃
Ambient temperature: -20 ~ 80℃
Storage temperature: -20 ~ 100℃
Material: probe: stainless steel 304 (optional 3 16L), shell: stainless steel 304.
Technical parameter of embedded formula 43 1 1: measuring range: it can be continuously calibrated from 0-20cm/s to 1- 100cm/s (related to water, the range is expanded for other media).
Measurement time: 2- 10 second, depending on the measurement conditions.
Linear deviation:
Repeatability tolerance:
Temperature drift:
Power supply voltage: 24V DC 10%
Current consumption: max 100 mA.
Output current: 4-20mA
Resistive load: 0-600 Ohms Switch value (D): It is a digital signal, which is a switch state: high level and low level (that is, on and off, 1 and 0, etc.). );
Analog (A): It is an analog signal, that is, a general voltage or current signal.
Voltage signal: measure the flow and convert it into 1 ~ 5V voltage signal, which is analog.
Current signal: measure the flow and convert it into 4 ~ 20ma current signal, which is also analog. Characteristics For the measurement of water flow, the accurate flow can be obtained by measuring the pressure drop at both ends of the valve and orifice plate, and then checking the pressure drop and flow curve of the valve or orifice plate, and the flow can be obtained by the pressure drop method. It was first used in 2003, and has been widely used in water-side systems and flow meters of HVAC since 20 13. The application of differential pressure switch in HVAC system is mainly controlled according to the resistance and flow curve of HVAC equipment. Water-side heat exchangers (sleeve type, shell-and-tube type, tube-plate type and commonly used plate type heat exchangers), water filters, valves and pumps in HVAC all have their performance curves of pressure drop and flow rate. As long as the pressure difference measured on both sides of the pressure difference switch is compared with the preset value, the flow can be accurately controlled. As the flow control in HVAC, differential pressure switch has the characteristics of accurate flow control, no additional resistance to water system, no requirement for water pipe diameter and no disturbance to water flow, and can replace any form of target flow switch. Compared with the target flow switch, it can avoid the false flow caused by pump cavitation and has very accurate reset flow and disconnection flow. The invention can be widely applied to large, medium and small air-cooled or water-cooled chillers, and adopts plate heat exchangers, sleeve heat exchangers and shell-and-tube heat exchangers for water flow control and monitoring of water pumps and water filters. Technical parameter △ Temperature range of medium used: -20 ~ 93℃
△ High and low voltage side connection interfaces:1/4sae (7/16-20unf), G 1/4, etc.
△ Maximum allowable static pressure: 10bar (20bar can be customized)
△ Maximum allowable pressure difference: 5 bar (8 bar can be customized)
△ Repeatability deviation of set value: 1%
△ output form: a set of SPDT dry contact outputs (factory standard two-wire normally open output, three-wire normally open normally closed output optional)
△ Switch parameter: 10A (max. ) 250 volts (max. )
△ Connection mode: 105℃ flame retardant sheath line 2X0.75mm2 or 3X0.75mm2 is optional.
△ Enclosure protection grade: IP54