FSP900 Series：thermal flow switch|Water Flowmeter
FSP900 Type: insertion flowmeter|hermal flow switch|Water Flowmeter
- Technical specifications
- Series specifications
- Scope of application
- Order information
- Catalog download
- Flow range: water: 0.03~3 m/S oil: 0.03~3 m/S
- Applicable pipe diameter size: DN8~DN350
- Detection fluid: water, oil
- Protection level: IP67
FSP900 water flow switch
is a device that automatically controls and protects water flow. When the water flow is changed, when the force generated by the water flow on the target is dynamic, the control circuit absorbs or disconnects, so as to achieve the purpose of automatic control. Water flow switches are widely used in HVAC air conditioning systems
FSP900 water flow switch
Product Featured Design
FSP900 water flow switch
Remote monitoring design
The working principle of FSP900 water flow switch:
The FSP900 water flow switch will be installed on the chilled water outlet of the chilled water unit and the chilled water/chilled water outlet of the water-cooled chiller. Normally closed water flow switch (when the air conditioning system is operating normally, the water flow switch control circuit is closed, here refers to the state of the water flow switch is normally closed) The working process is: when the water flow reaches a certain value, the FSP900 water flow switch is closed After that, the compressor starts and the air-conditioning system starts to run. If there is water leakage in the air conditioning system or other reasons that reduce the water flow of the system, when the water flow drops to a certain value, the water flow switch will be turned off, and the compressor will stop at the same time, and the HVAC air conditioning system will stop running.
1. Cooling water outlet pipe; 2. Water-cooled chiller condenser; 3. Water-cooled chiller evaporator; 4. Chilled water outlet pipe; 5. FSP900 water flow switch.
Installation position of FSP900 water flow switch in air conditioning system
The function of FSP900 water flow switch:
When the air-conditioning system has sufficient water flow, the FSP900 water flow switch is closed, after which the compressor is started, so as to ensure the safe and efficient operation of the air-conditioning system.
1) When the chilled water flow is too small, the evaporator load is insufficient, the evaporating temperature is low, the cooling capacity decreases, and the operation efficiency decreases.
2) When the chilled water flow is extremely small, the evaporator load is seriously insufficient, the evaporation temperature is very low, the evaporator freezes (or even freezes), and the compressor suction pressure is very low. If the system is operated for a long time under this working condition, the compressor will be damaged due to difficulty in oil return.
3) When the cooling water flow of the water-cooled chiller is too small, the heat dissipation efficiency of the condenser is low, and the heat of the fluorine system cannot be dissipated in time, which causes the system's condensing temperature to rise, the cooling capacity to drop, and the operating efficiency to decrease.
4) When the cooling water flow of the water-cooled chiller is extremely small, the heat dissipation of the condenser is seriously insufficient, the condensing temperature rises to a high level, and the compressor discharge temperature is extremely high. If the system is operated for a long time under this working condition, the compressor will be damaged due to the carbonization of the lubricating oil.
Design flow value:
Illustrate the method of calculating the closed and open flow values of the chilled water flow switch of a chiller with a certain cooling capacity.
Knowing that the cooling capacity of the chiller is 32kW, try to calculate the closed and open flow values of the matched water flow switch.
1) Calculate the closed flow value of the water flow switch. The design water flow (m3/h) of the unit evaporator can be calculated according to formula (1):
Taking into account the induction error of the water flow switch, the open flow value of the water flow switch is (3.1±0.2) m3/h.
Application of FSP900 water flow switch:
The FSP900 water flow switch uses stainless steel corrosion-resistant inserts with high pressure resistance to detect water flow conditions. When there is water flow, it quickly captures the flow rate and temperature of the flowing water and drives the action output to provide a water flow status signal.
The installation requirements are relatively high, and the resistance is relatively large when installed in small pipe diameters, and it cannot be installed on curved pipelines. When installed in a small pipe diameter or when the water flow is small, it is easy to be shaken by the water flow and move frequently. The FPS900 water flow switch also solves the traditional design flow switch problem, and it is easy to cause the target to break when installed at the large pipe diameter elbow. An effective solution is obtained.
The static pressure of the pipeline impacts the bellows, and the bellows is prone to fatigue due to frequent movements.
FSP900 water flow switch solves the cause of the target fracture of the target flow switch:
Solve the problem that the force of the target of the target type flow switch is related to the water flow speed and the area of the target. The larger the flow rate and the area of the target, the greater the force acting on the target. Usually installed in a large pipe diameter water flow switch for better For sensing water flow, the longest target is often installed on site. Due to the large force acting on the target, the target is excessively bent and loses its elasticity. In severe cases, the target is broken.
The target type flow switch usually needs to be more than 5 times the pipe diameter from the elbow and valve. Due to the small area of the computer room of the current building, it is impossible to guarantee enough straight pipe sections to install the water flow switch. For example: DN300 pipe diameter, before and after the water flow switch It is almost impossible to guarantee a straight pipe section of 1500m. This is a very important reason for the failure of many on-site water flow switches.
In a curved pipe, due to the diversion effect of the curved pipe wall, the inner flow velocity increases, and the outer flow velocity gradually decreases, forming a trapezoidal velocity distribution law of each flow section, causing the entire target to be unevenly stressed and broken .
The impact of the water hammer generated every time the pump starts and stops will cause the target to be excessively bent or broken. The larger the pipe diameter, the greater the risk.
The FSP900 water flow switch can be installed closer to the elbow or valve, which can greatly reduce the straight pipe section required to install the target flow switch, which saves the engineering cost and greatly improves the stability of the water flow protection. The factory has been widely used.
Installation method of FSP900 water flow switch
FSP900 water flow switch full pipe installation
Water flow switch
-20~80 ℃,≤8 5 % R H
Flow rate display / Temperature display
Multi display interface
2 Sets of 4-20mA (flow+temperature) + 2 Sets of alarm contacts
Relay (flow+temperature) + 2 sets of alarm contacts
NPN/PNP (flow+temperature) + 2 sets of alarm contacts
F01: Welded joint
F02: Three-way threaded joint
F03: Three-way flange joint
IoT_D: Rail installation MI/O+RS485
IoT_R: Rail installation RS485
IoT_N: Economical installation of RS485
Flow Output signal Temperature Output signal communication Power Relay NPN
4-20mA Relay NPN
4-20mA RS485 24V
FSP900-S1 DN8~DN100 M
With Optional With With Optional With With With -- FSP900-S2 DN80~DN450 M
With Optional With With Optional With With With --
Water: 0.03~3 m/s; Oil: 0.03~3 m/S; Air: 2~30 m/S For sensor rod length (mm): 45.5 (standard type)
Water: 0.03~3 m/s; Oil: 0.03~3 m/S; Air: 2~30 m/S For sensor rod length(mm): 72.5 (long shaft type)
Water (Standard type)
Flow/Temperature: 4~20mA+2 Sets of Relays
Flow/Temperature: 4~20mA+2 Sets of NPN
Flow/Temperature: 4~20mA+2 Sets of PNP
Specify the length of the sensing rod (unit: mm)
The total product length tolerance is ± 5mm
Features, specifications and dimensions are subject to change without notice
Maximum length. 200mm
Please contact our service center
Stainless steel 304
Optional accessories: connector
Welding joint (applicable: DN25~DN350)
Three-way screw joint (applicable: DN8~DN50)
Three-way flange (applicable: DN25~DN150)
Optional function: remote monitoring transmitter
Rail-mounted type (applicable: MIO: AI/DI input)
Rail-mounted type RS485
Economical Type RS485
Optional function: SMM software
Complete Ordering Code
＊Note:Using customer Logo launch to more than 100 united for one year