LD-1151、3051（GP、AP）系列壓力變送器
LD-1151、3051（GP、AP）Series Pressure Transmitter
LD-1151、3051（GP、AP）系列壓力變送器簡介
壓力變送器主要用于測量氣體、液體和蒸汽的壓力、真空等參數(shù)，然后將其轉換成4～20mA DC信號輸出。壓力變送器包括GP型（表壓力）和AP型（壓力）兩種類型。GP和AP型與智能放大板組合，可構成智能型壓力變送器，它可通過符合HART協(xié)議的手操器相互通訊，進行設定和監(jiān)控。
GP型壓力變送器的δ室一側接受被測壓力的信號，另一側則與大氣壓力貫通，因此可用于測量表壓力或負壓。
AP型壓力變送器的δ室（結構參見AP型壓力變送器的壓力δ室敏感部件圖）一側接受被測壓力的信號，另一側被封閉成高真空基準室，它可以測量除氣系統(tǒng)、蒸餾塔、蒸發(fā)器和結晶器等的壓力。
Brief Introduction:
LPressure transmitter is principally used to measure such parameters as pressure and negative pressure of gases, liquids, and vapors before transform them into 4～20mA DC signals for output purpose. Pressure transmitter has two models: GP model （meter pressure） and AP model （absolute pressure）. Both GP and AP models can be integrated with amplifying board to form inligent pressure transmitter, which can communicate with hand-controller in conformity with HART Protocol to realize enactment, monitoring, and control.
As one side of the δ cabinet of GP model pressure transmitter receives signals of pressure to be tested, and another side of it runs through atmospheric pressure, it can be used to measure meter pressure or negative pressure.
As one side of the δabinet of AP model pressure transmitter （see following figure Ap pressure transmitters absolute pressure of δ sensor） receives signals of absolute pressure to be tested and another side of it is enclosed as a reference chamber with high vacuum, it can be used to measure absolute pressure of degassing system, distillation tower, evaporator, crystallizer, and so on.
產(chǎn)品特點
- 精度高，性能穩(wěn)定。
- 二線制，4～20mA DC 輸出。
- 采用固體δ室元件，接插式印刷電路板，抗振性強。
- 量程、零點大范圍連續(xù)可調。
- 單向過載保護性能好。
- 零部件互換性、通用性好，經(jīng)久耐用。
- 安裝方便，使用場合廣泛，戶外、防爆、高溫和強腐蝕環(huán)境均可。
- 針對LD-3051型智能壓力變送器還具備以下特點：
- 微處理器的使用使智能變送器的靈活性增大、功能增強。
- 智能電子部件僅一塊線路板組成，*性更強、可靠性更高。
- 量程比為10：1或15：1。
- 量程范圍寬：0～25Pa～42Pa。
- 就地按鍵調整零點和量程。
- 符合HART協(xié)議，可用HART通訊器與本智能表進行雙向通訊而不中斷輸出信號。
- 具有自診斷功能和遠程診斷功能。
- 帶有EEPROM，斷電后不丟失數(shù)據(jù)。
- High in accuracy and steady in performance
- Two-wire system, 4～20mA DC output
- Solid cell is adopted for δ cabinet. With direct-plug printed circuit board, it has strong vibration resistance.
- Continuously adjustable in measuring range and large range in zero point
- With good performance in protection of single-direction overload
- Good in interchangeability and commonality, with long-term durability in usage
- Easy to install. It has wide using occasions, covering outdoor, flameproof, high temperature, and environments with strong causticity.
Ap型壓力變送器的壓力δ室敏感部件
AP series pressure transmitter absolute Pressure δ room Sensor component
結構和工作原理
電容式壓力變送器主要由實現(xiàn)壓力/電容轉換的δ室敏感部件和將電容轉換成二線制4～20mA.DC的電子線路板組成。
Structure and working principle:
Capacitance pressure transmitter principally comprise of sensing unit of δcabinet to perform pressure / capacitance conversion and electronic circuit board to convert capacitance into 4～20mA DC in two-wire system.
當過程壓力從測量容室的兩側（或一側）施加到隔離膜片后，經(jīng)硅油罐充液傳至δ室的中心膜片上，中心膜片是一個邊緣張緊的平膜片，在壓力作用下產(chǎn)生相應的位移（zui大約0.1mm），該位移即形成差動電容變化，并經(jīng)電子線路板的解調、振蕩和放大，轉換成二線制的4～20mA.DC輸出信號，輸出電流與過程壓力的大小成正比。
When course pressure is applied to isolating membrane from two sides （or one side） of the measuring cabinet, through transfer by silicone oil as filling liquid to the central membrane of cabinet, which is an edge-tightened flat membrane, corresponding displacement （0.1mm at most） is generated by the effect of pressure. This displacement makes changes of differential capacitance accordingly, which is converted into 4～20mA DC output signal through demodulation, oscillation, and amplification by electronic circuit board. And the output electric current is in direct proportion to the course pressure.
LD-3051系列智能型變送器的工作原理
Principle of LD-3051 Series Inligent Pressure Transmitter:
上圖中敏感元件測得的壓力信號，通過振蕩和解調環(huán)節(jié)轉換成與壓力成正比的直流信號，A/D轉換器將此電流轉換成數(shù)字信號，其值被微處理器用來判定輸入壓力值。微處理器控制變送器工作。另外，它還進行傳感線性化、重復測量范圍、工作單位轉換、阻尼、開方、傳感器微調等運算，以及診斷和數(shù)字通訊。
D/A轉換器把微處理器來的并經(jīng)過校正的數(shù)字信號轉換成4～20mA模擬信號并送到輸出回路。
EEPROM保存所有組態(tài)、特性化和數(shù)字微調數(shù)據(jù)，這些數(shù)據(jù)可用變送器軟件修改，數(shù)據(jù)貯存在EEPROM內即使斷電也保存完整。
數(shù)字通信線路為變送器提供一個與外部設備（采用HART協(xié)議的控制系統(tǒng)）的連接接口。此線路檢測疊加在4～20mA上的數(shù)字信號，并通過回路傳送所需信息。
The pressure signal measured by the sensing element shown in above figure, being converted into DC signal in direct proportion to pressure through stages of oscillation and demodulation, is converted into digital signal by A/D converter, whose value is used to determine the input pressure value by microprocessor, which controls how the transmitter works. In addition, it also performs such operations as linearization for sensing, repetition of measuring range, conversion of working units, amortization, evolution, and trimming of sensors, together with diagnose and digital ecommunication.
D/A converter converts corrected digital signals from microprocessor in to 4～20mA analog signals and sends them to output circuit.
In EEPROM, all group statuses, and characterized and digital trimming data are stored. These data can be modified with transmitter software and stored in EEPROM compley, even in case of power supply interruption.
Digital ecommunicating circuit provides an interface for the transmitter, connecting peripheral equipment （adopting HART Protocol for control system）. This circuit check will be added to the 4～20mA digital signal, and the needed information is transmitted through the return circuit.
主要技術參數(shù)
- 測量范圍：0～1.3～41370（kPa）
- 精確度等級：0.25
- 過載壓力：≤7MPa，200%；≤21MPa，150%；≤42MPa，125%
- 介質溫度：灌充硅油-40～104℃；
灌充氟油0～71℃ - 環(huán)境溫度影響：±0.2℃%/28℃
- 輸出信號：4～20mA.DC二線制（適用于1151系列）
二線制4～20mA直流信號上疊加數(shù)字信號，由用戶選擇線性或開方輸出。
（適用于3051系列） - 供電電源：12～45V.DC
- 負載特性：見下圖
Principal Technical Indicators
- Measuring range: 0～1.3～41370 （kPa）
- Precision class: 0.25
- Overloaded Pressure: ≤7MPa, 200%; ≤21MPa, 150%; ≤42MPa，125%
- Medium temperature: -40～104℃ （if silicone oil is filled）; 0～71℃ （if fluorocarbon oil is filled）
- Influence by ambient temperature: ±0.2℃%/28℃
- Output signal: 4～20mA DC, two-wire system （applicable for 1151 series）
- For 4～20mA added with digital signal, clients are allowed to choose linear output or evoluted output （applicable for 3051 series）.
- Power supply: 12～45V DC
- Load features:right chart
型號規(guī)格 Types and specifications
附注：
1.超壓影響和溫度影響，均在變動器zui大量程下進行測定。
2.在其他量程下，超壓引起的零點變化，通過零點調整，即可恢復正常工作。
3.GP型壓力變送器符合技術指標的工作壓力：
充硅油時：≥3.5kPa.abs
充氟油時：高于大氣壓力
Remarks:
- Influences caused due to overpressure and temperature are measured when the transmitter reaches its maximum measuring range.
- Zero point variation caused due to overpressure at other measuring ranges can be restored to normal work through zero adjustment.
- For those GP model pressure transmitters in conformity with technical indicators, the working pressures are:≥3.5kPa.abs if silicone oil is filled, or greater than atmospheric pressure if fluorocarbon oil is filled.
外形尺寸 External dimension
裝配分解圖 Internal structure
型號表示 Model designations
訂貨須知 Ordering instructions
訂貨時須注明：產(chǎn)品電腦編碼、型號、名稱、精確度、測量范圍。如特殊要求，請注明技術要求。
Ordering instructions: The product computer code ,types, names, accuracy grades, and measuring ranges .must be clearly noted. In case of special requirements, technical requirements shall be clearly noted specifications on the back of the order on ordering goods.
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