AO920 (Simulated, Full Intelligent HART) Ceramic Capacitive Pressure Transmitter

I. Overview

The AO920 Ceramic Capacitance Pressure Transmitter employs a ceramic capacitance sensor, paired with high-precision electronic components, and is assembled through a stringent manufacturing process. It utilizes a dry pressure measurement technology without an intermediate fluid. It fully leverages the technical advantages of the ceramic sensor, endowing the pressure transmitter with exceptional technical performance. It boasts strong overload and impact resistance, high stability, and high measurement accuracy. The AO920 Ceramic Capacitance Pressure Transmitter comes in various models, ranges, process connection types, and materials. It is widely applicable in many industrial sectors such as petrochemicals, chemicals, power, metallurgy, and food industries, capable of adapting to various industrial measurement scenarios and mediums. It is an ideal upgrade replacement for traditional pressure gauges and transmitters, serving as an ideal pressure measurement instrument in the field of industrial automation.

Part II: Working Principle

The pressure of the medium being tested is directly applied to the ceramic diaphragm of the sensor, causing a minute displacement proportional to the medium pressure. Under normal operating conditions, the displacement of the diaphragm does not exceed 0.025 millimeters. After the electronic circuit detects this displacement, it converts it into a standard industrial measurement signal corresponding to this pressure. In cases of overpressure, the diaphragm is directly adhered to the sturdy ceramic substrate. Due to the gap between the diaphragm and the substrate being only 0.1 millimeters, the displacement of the diaphragm under overload can only be 0.1 millimeters, thereby structurally ensuring that the diaphragm will not undergo excessive deformation. The use of high-performance industrial ceramics for the diaphragm enhances the sensor's strong shock and overload resistance capabilities.

Section 3: Features

1. High overload and impact resistance

Overvoltage can reach several to hundreds of times the rated range.

2. High precision, good repeatability, and high stability

Superior to 0.1% F.S./1 year.

3. Low temperature drift

Due to the elimination of the intermediary fluid for the measuring element, the sensor achieves high measurement accuracy and is minimally affected by temperature.

4. Strong anti-interference capability

Waterproof, dustproof, shockproof, explosion-proof, and corrosion-resistant.

5. Easy installation

The product has a rational structure, is compact in size, and lightweight, allowing for direct installation at any location.

IV. Technical Specifications

1. Technical Specifications

Intended Use: Liquids, Gases, or Steam

Measurement Range Table: Pressure: 0～5KPa～3.5MPa

Sealed Gauge Pressure: 0～7 MPa

Absolute Pressure: 0～7 KPa

Vacuum: -0.1 MPa to 2 MPa

Output: 4-20mA DC

Power Supply 12-36VDC

Load Characteristics 4-20mA two-wire system

Temperature Range Environmental Temperature -40℃ to +85℃

Shell Protection Exceeds IP65

Explosion-proof Type: Intrinsically Safe Type iaⅡCT6 with Ex-proof Type dⅡCT6; External Safety Fencing Required for Intrinsically Safe Type iaⅡCT6

2. Performance Specifications

Integrated Precision - Precision Grade: 0.1%, 0.2%

Stability: Better than ±0.1% FS/year

Temperature Influence: Within the range of -10℃ to +60℃, the variation is less than ±0.10%/10℃ (0.1 grade)

Variation less than ±0.15%/10℃ (0.2 grade)

-30°C to -10°C, 60°C to +85°C: Variation less than ±0.15%/10°C (0.1 grade)

Change less than ±0.20%/10℃ (0.2 grade)

Vibration Influence: The variation is less than ±0.02% at vibration frequencies of 20-200Hz in any direction. BFSL

Impulse Impact: Any direction, less than ±0.02% FS after 100G impulse within 11ms

Load Impact - There is no load impact as long as the terminal voltage of the transmitter is above 12V.

Location Affects - Installation location does not affect zero point

3. Structural Indicators

Structural Materials: Aluminum Oxide Ceramic Sheets

Shell: Low-Copper Cast Aluminum

Contact Medium Material: Stainless Steel 316L 1Cr18Ni9Ti

O-ring seal structure: Teflon or fluoroelastomer

Process Connection Standard Offers M20x1.5 External Thread

Electrical Connections can be pulled out from any outlet as required. It is recommended to use φ10 industrial cables for leads to facilitate sealing. The outlet connectors can be selected as a general cable connector PG16 or M20×1.5, with the non-lead end sealed with a cap.

4. Structural Dimensions