AO920 (analog, fully intelligent HART) ceramic capacitive pressure transmitter
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- Technical specifications
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- AO920 (analog, fully intelligent HART) ceramic capacitive pressure transmitter
1、 Overview
The AO920 ceramic capacitive pressure transmitter adopts a ceramic capacitive sensor, combined with high-precision electronic components, and is assembled through strict process. It adopts dry pressure measurement technology without intermediate fluid. Fully leveraging the technological advantages of ceramic sensors, the pressure transmitter has excellent technical performance. It has strong overload and impact resistance, high stability, and high measurement accuracy. The AO920 ceramic capacitive pressure transmitter has multiple models, ranges, process connection forms, and materials. It can be widely used in many industrial fields such as petroleum, chemical, power, metallurgy, pharmaceuticals, and food, and can adapt to various occasions and media of industrial measurement. It is an ideal upgraded product for traditional Pressure gauges and pressure transmitters, and an ideal pressure measuring instrument in the field of industrial automation.
2、 Working principle
The pressure of the measured medium is directly applied to the ceramic diaphragm of the sensor, causing the diaphragm to produce a small displacement proportional to the pressure of the medium. Under normal working conditions, the displacement of the diaphragm is not greater than 0.025 millimeters. After the electronic circuit detects this displacement, it is converted into a standard industrial measurement signal corresponding to this pressure. During overpressure, the diaphragm is directly attached to a sturdy ceramic substrate. As the gap between the diaphragm and the substrate is only 0.1 millimeters, the displacement of the diaphragm during overload can only be 0.1 millimeters. Therefore, the structure ensures that the diaphragm will not undergo excessive deformation. Due to the use of high-performance industrial ceramics, the sensor has strong impact and overload resistance.
3、 Characteristics
1. Strong resistance to overload and impact
Overvoltage can reach several to a hundred times the range.
2. High precision, good repeatability, and high stability
Better than 0.1% F.S/1 year.
3. Small temperature drift
Due to the elimination of the intermediate liquid in the measuring element, the sensor has achieved high measurement accuracy and is less affected by temperature.
4. Strong anti-interference ability
Waterproof, dustproof, vibration proof, explosion-proof, and anti-corrosion.
5. Easy to install
The product has a reasonable structure, small size, light weight, and can be installed directly at any position.
4、 Technical parameters
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1. Technical indicators
Object of use: liquid, gas, or vapor
Measurement range gauge pressure: 0-5KPa to 3.5MPa;
Sealed gauge pressure: 0-7MPa;
Absolute pressure: 0-7KPa;
Negative pressure:- 0.1MPa～2MPa
Output 4-20mADC
Power supply 12-36VDC
Load characteristics 4-20mADC two-wire system
Temperature range: ambient temperature -40 ℃~+85 ℃
The shell protection is better than IP65
Explosion proof type and explosion-proof type d Ⅱ CT6; The intrinsically safe type IA Ⅱ CT6 should be equipped with an external safety barrier
2. Performance indicators
Comprehensive precision accuracy level: 0.1%, 0.2%
Stability better than ± 0.1% FS/year
Temperature impact within the range of -10 ℃ to+60 ℃: variation less than ± 0.10%/10 ℃ (0.1 level)
Change less than ± 0.15%/10 ℃ (0.2 level)
-30 ℃~-10 ℃, 60 ℃~+85 ℃: variation less than ± 0.15%/10 ℃ (0.1 level)
Change less than ± 0.20%/10 ℃ (0.2 level)
When the vibration frequency is 20-200Hz in any direction, the variation is less than ± 0.02% BFSL
The impact affects any direction with a 100G impact for 11ms, and the change is less than ± 0.02% FS
As long as the terminal voltage of the input transmitter is higher than 12V, there will be no load impact.
Location affects installation position but does not affect zero point
3. Structural indicators
Structural material membrane: alumina ceramic
Shell: Low copper cast aluminum
Contact medium material: Stainless steel 316L1Cr18Ni9Ti
O-ring sealing structure: polytetrafluoroethylene or fluororubber
The process connection standard provides M20 × 1.5 external thread
The electrical connection can be led out from any outlet as needed, and it is recommended to use a φ 10 industrial cable as the lead for sealing The universal cable connector PG16 or M20 × 1.5 can be used for the lead out joint, and the non lead end should be sealed with an end cap.
4. Structural dimensions
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AO920 (analog, fully intelligent HART) ceramic capacitive pressure transmitter Instrument Model AO920 ceramic capacitor pressure transmitter Measurement Range A 0～10 kPa B 0～20 kPa C 0～40 kPa D 0～100 kPa E 0～200 kPa F 0～400 kPa G 0～1.0MPa H 0～2.0MPa I 0～4.0MPa Z Other Range Output Signal E 4～20mADC S Intelligent HART Fieldbus Protocol Interface Basic Error 2 0.10% 3 0.20% Process Connection A Clamp Type 1" (Suitable for Ranges Above 100kPa) (Note: Material) B Clamp Type 1 1/2" (Note: Material) C Clamp Type 2" (Note: Material) F Flange DN25 PN40 (Note: Material) G Flange DN50 PN40 (Note: Material) H Flange DN80 PN40 (Note: Material) R Standard Type M20×1.5 External Thread (Commonly Used) 0 Custom Machining per User-Provided Dimensions Options M3 3 1/2-Digit LCD Digital Display Head G Gauge Pressure Measurement A Absolute Pressure Measurement F Negative Pressure Measurement S Heat Sink and Process Connection Fittings Q Custom Specification X Oil-Free Requirement Y Water-Free and Oil-Free Requirements Z Degreasing Treatment i Intrinsically Safe Type Exia IIC T6 d Explosion-Proof Type Exd IIC T6 L Lightning Protection Selection Example AO920 - F - S - 3 - R - M3d Note1 This product must NOT be used with media containing hydrofluoric acid, acetic acid, ammonia, etc Note2 Flange with PTFE Material (Suitable for Anti-Corrosion Applications with Ranges Below 600kPa) Note3 Clamp Type 1" (Suitable for Ranges Above 100kPa)
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