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Fire new regulation water tank level controller, level measuring and controlling instrument, water level display instrument device, fire liquid level valve

High upper limit water level alarm, low lower limit water level alarm, 220V power supply, can adjust the liquid level value

price:USD$536.00
discount 70% in 2018-09-18 to 2018-09-20
price: USD$ 375.20
freight :USD$18.00,(Express)
freight :USD$7.00,(Postal parcel)
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Water level indicator: used for water level measurement, control and alarm in water conservancy, electric power, environmental protection, water supply, drainage, petroleum, food and other industries

Instrument Description: with various sensors, transmitters used in conjunction with the temperature, pressure, liquid level, flow, weight and other industrial process parameters for measurement, display, alarm control, variable output, data acquisition and communication.
Main technical index of instrument:
Basic error: 0.5%FS + 1 words
Resolution: 1/20000, 14 bit A/D converter
Display mode: two row four bit LED digital tube display
Sampling period: 0.2S
Alarm output: 2 Road, lower limit output, the control output point can be arbitrarily set, the relay output contact capacity AC220V/3A (standard)
Variable output: 4 ~ 20mA, 0 ~ 10mA, 1 ~ 5V, 0 ~ 5V (optional)
Communication output: interface mode isolated serial bidirectional communication interface (optional) RS485/RS422/RS232/Modem (optional)
Feed output: DC24V/30mA
Power supply: switching power supply 85 ~ 265VAC, power consumption below 4W
Probe structure features:
The diffusion silicon sensor, accurate measurement, good stability, the transmitter probe adopts stainless steel sealing structure, filled with silicone oil, sensor chip and medium level measurement can be completely isolated, a variety of media, compact and firm structure, convenient installation and use, is the scene with a digital display output indicator
Probe working principle
The static pressure level transmitter sensor is to determine the liquid level height by measuring the static pressure generated by the liquid level. Said, with the formula P=Po+, GH: Po the hydrostatic pressure to the atmospheric pressure, the upper level, for the measured liquid density, liquid height for H, G for the acceleration of gravity (constant). When the Po remains constant, the pressure depends on the two variables of density and liquid level. When the liquid density is a certain value, the liquid level will be linear with the pressure. This pressure acts on the pressure sensing surface of the transmitter silicon pressure sensor, and converts the liquid column pressure into the voltage signal through the piezoresistive effect of the sensor. This signal is amplified and converted into 4~20mA directly.
If the upper atmospheric pressure changes, the pressure sensor will be affected by the same level change. BP-800K adopts the design method of through core gas permeable cable, and introduces the external atmospheric pressure to the other side of the sensing surface of the sensor. Thus, the atmospheric pressure is eliminated.
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