differential pressure a burglar alarm When we hear the name, we will think what kind of machine it is. The so-called differential pressure alarm is a common type of wind pressure sensor in industry, which is widely used. It can be said that it will save a lot of time and energy in industry. Especially dust remover Spraying equipment 、 air conditioner Filter, boiler furnace negative pressure and positive pressure air supply system. Next century Xinggangong will take you to know about the differential pressure alarm.
This equipment consists of two parts:
1) Digital display
2) Air pressure differential sensor
The product adopts the wind pressure measurement core imported from the United States, with double row 4-digit digital display, which respectively displays the measured differential pressure value and the control output differential pressure value (user can freely set); belt Power Supply instructions lamp (Power switch button), with audible and visual alarm.
Introduction to audible and visual alarm pipeline wind pressure alarm device:
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measuring range
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Differential pressure/wind pressure: 0-5KPA
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Allowable overvoltage
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2 times full scale pressure
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Measuring medium
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Non corrosive, dust-free and dry gas
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Comprehensive precision: linear, repetitive, hysteresis
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±0.1%FS
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±0.2%FS
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±0.4%FS
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Medium temperature
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-20℃~85℃
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Compensation temperature
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-10℃~70℃
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ambient temperature
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-10℃~70℃
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Zero temperature drift
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Classic: 0.02% FS/℃
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Explosion proof type: 0.05% FS/℃
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Sensitivity temperature drift
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Classic: 0.02% FS/℃
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Explosion proof type: 0.05% FS/℃
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Long term stability
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Classic type: ± 0.1% FS/year
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Explosion proof type: ± 0.2% FS/year
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Power supply range
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12~36VDC (24VDC generally)
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signal output
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4~20mA / 1~5V DC;/ 0~5V DC;/ 0.5~4.5V DC
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Load resistance
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≤(U-12)/0.02 Ω
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Housing material
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PP plastic or 304 stainless steel
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Protection grade
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IP65 or IP67
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Process connection
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Φ 8 nozzle belt M10x1 mounting screw (special thread connection is allowed)
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Explosion proof sign
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Exia II CT5 (intrinsically safe explosion-proof type)
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weight
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About 0.35Kg
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Vibration error
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≤ ± 0.01% FS (X, Y, Z axis, 200Hz/g)
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response time
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≤2 ms
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insulation resistance
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100MΩ,500V DC
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Easy to use. It is suitable for measuring the pressure or differential pressure of various dry and non corrosive gases with high measurement accuracy. After precise temperature compensation, amplification and processing, it is converted into 4-20mA standard signal, which is very simple to interface with industrial computer or distribution system. There are M4 screw mounting holes on both sides of the body, and threads on the air nozzle. Users can choose screws or M10 * 1.5 nuts to fix. The default pressure interface is φ 8 Pagoda nozzle, of which the long nozzle is the high-end pressure interface and the short nozzle is the low-end pressure interface. (Optional φ 6 Pagoda mouth or quick plug connector)
In particular, the display function is added to realize the synchronous display of on-site display and upper machine position, which is convenient for on-site personnel to watch and debug. Advanced circuit linearity and temperature compensation technology; Make the transmitter perform better. Compact and solid structure; Small size and light weight; Simple installation; Easy to use. It is suitable for measuring the pressure or differential pressure of various dry and non corrosive gases with high measurement accuracy. After precise temperature compensation, amplification, conversion into 4-20mA standard signal, interface with industrial computer or distributed system, widely used in the measurement of air duct pressure or flow in petroleum, chemical, metallurgy, power plants, to achieve the control of automatic measurement in production process.
Audible and visual alarm pipeline wind pressure alarm device Product purpose:
One purpose is to detect whether the filter (dust remover) is blocked, and there are impurities in the gas. The purpose of using the filter is to filter these impurities. When the filter filters too many impurities, the pressure difference between the front and back of the filter will become larger (blocked), so a differential pressure transmitter is needed to monitor the working condition of the filter. If the pressure difference becomes larger, The filter needs to be replaced or cleaned.
For another purpose, when the filter is blocked, the gas cannot pass through, the pressure at the back end of the filter will decrease, and the air may enter the gas pipeline from the gas outlet to mix with the gas, which will explode when you ignite again. Therefore, this differential pressure transmitter should be installed for safety reasons. For the above two reasons, the differential pressure transmitter must be installed.
Product application:
This system can be used in the environmental protection and dust removal alarm protection system of plate processing, furniture manufacturing, casting industry, ceramics industry, glass industry, refractory materials, cement building materials, grinding wheel manufacturing, chemical products, machining and other industries, to provide basic data support for the stable operation of the dust removal system, and to alarm the abnormal information that occurs during the operation of the dust removal system, The operation efficiency of the dust removal equipment is improved, and the safe and stable operation of the dust removal system is ensured to achieve the purpose of environmental protection dust removal.
The differential pressure alarm has two pressure ends, which are divided into high pressure end (H) and low pressure end (L). Measure the pressure difference between the high pressure end and the low pressure end. How to determine the differential pressure range? First, consider the system pressure when the tested system works normally, which can also be called unilateral pressure. Secondly, determine the value of the pressure difference between the measured end and the reference end, that is, the range of the pressure difference alarm. If the pressure at the high pressure end of the tested device must be higher than that at the low pressure end, a single range can be selected, such as 0-1Kpa, 0-10Kpa; If the high voltage end cannot be determined, - 1KPa and - 10Kpa can be selected, so that both ends can be connected at will and the test is more convenient.
Example 1: Check whether the performance of the filter meets the standard. The inlet pressure of the filter is 300KPa, and the filter needs to be replaced when the outlet pressure of the filter is less than 280KPa. Then, the differential pressure transmitter can be selected according to the parameters that the system pressure is 300KPa and the differential pressure range is 20Kpa.
Example 2: Check the consistency of pressure in two high-pressure tanks. The standard pressure in the tank is 1 MPa, and the two tanks are inflated at the same time to ensure that the pressure difference between the two tanks is less than 1 kPa. Then we can select the range of differential pressure transmitter according to the parameters of system pressure 1 MPa and differential pressure - 1 kPa.
