Lightningproof circuit and immersion type piezoresistance liquid level transmitter with the same
A lightning protection circuit and transmitter technology, applied in the direction of displaying liquid level indicators, circuit devices, emergency protection circuit devices through pressure measurement, etc. transmitter, large residual pressure, etc.
Inactive Publication Date: 2008-03-05
KUNSHAN SHUANGQIAO SENSOR MEASUREMENT CONTROLLING
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] 2. A powerful lightning protection discharge tube is connected between the power supply and the signal for protection. This protection method can protect against a large surge impact energy, but the residual voltage is large, which may easily cause damage to the transmitter integrated circuit. ;
[0005] 3. The plug-in type lightning protection and surge power protector is used for protection. Its protection ability is good, but its large appearance is not suitable for small pressure liquid level transmitters.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0027] Further description will be made below in conjunction with Fig. 1 to Fig. 4:
[0028] A lightning protection circuit is connected between the input line and the output line of the transmitter. The lightning protection circuit is composed of three-level circuits, among which:
[0029] The first-stage circuit is composed of three gas discharge tubes U1, U2 and U3, a first resistor R1, a second resistor R2, a first inductance L1, and a second inductance L2. One of the three gas discharge tubes is connected across the Between the input line and the output line of the transmitter, the other two gas discharge tubes are respectively connected between the input line and the output line of the transmitter and the ground. The three gas discharge tubes have a discharge capacity of 10KA and an Response time, the first resistance R1 and the first inductance L1, the second resistance R2 and the second inductance L2 are respectively connected in series with the input line and output l...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A throw in type compressive resistance liquid level transmitter having lightning protection circuit consists of compressive resistance force sensitive assembly, transmitter, transmitter shell and gasses guide balanced cable. Said Pressure resistance sensitive assembly is made of silicon pressure resistance sensitive element with soaking silicone oil insulated by stainless steel corrugation film, using stainless steel corrugation film as compression face to transmit pressure to silicon pressure resistance sensitive element whose back pressure side with transmitter shell being water proof sealed, gasses guide balanced cable with transmitter shell being water proof sealed, gas tube in gasses guide balanced cable realizing silicon pressure resistance sensitive element communication with atmospheric pressure, lightning protection circuit connected between transmitter input / output wire, lightning protection circuit packaged on lightning protection circuit board in stainless steel shell, stainless steel shell with transmitter being waterproof sealing, lightning protection circuit and transmitter housing earthing. The present invention has high protection lightning stroke energy, fast response time, small residual voltage and current, low restrain voltage, and small transmitter packaging size etc properties.
Description
technical field [0001] The invention relates to a lightning protection circuit and an input piezoresistive liquid level transmitter with a lightning protection circuit, in particular to a lightning protection circuit with strong lightning resistance and an input piezoresistive liquid level transmitter with a lightning protection circuit Transmitters are used in applications where open spaces, high locations are susceptible to lightning strikes, long lead-out cables, and pressure level transmitters must be miniaturized. Background technique [0002] The main methods of lightning protection and surge protection circuits currently applied to power supply and electrical protection are: [0003] 1. Connect the varistor or TVS tube between the power supply and the signal line for protection. This kind of protection method is simple but the surge impact energy that can be protected is small; [0004] 2. A powerful lightning protection discharge tube is connected between the power ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04H02H3/22G01F23/14
Inventor 谢维钦王文襄许广军李建峰
Owner KUNSHAN SHUANGQIAO SENSOR MEASUREMENT CONTROLLING