Diaphragm sealed differential pressure transmitters are used to measure the pressure, level or density of liquids, gases or vapors. The use of fully sealed capacitors or silicon differential pressure sensing components allows for high measurement accuracy and excellent stability and reliability.
The sealing diaphragm is used to prevent the medium in the pipe from directly entering the pressure sensor assembly in the differential pressure transmitter. It is connected to the transmitter by a capillary filled with fluid.
Diaphragm sealed differential pressure transmitters are used to measure the pressure, level or density of liquids, gases or vapors. The use of fully sealed capacitors or silicon differential pressure sensing components allows for high measurement accuracy and excellent stability and reliability. The product can be configured with HART communication protocol and can communicate with the control system or the handheld device. They are set up, monitored, tested and configured. The HART protocol uses the industry standard BELL202 frequency phase shift keying (FSK) technology to superimpose the digital signal on the 4~20mA signal to achieve communication. The communication frequency signal does not cause any interference to 4~20mA.
Standard technical specifications:
1. Communication line conditions:
Power supply voltage: 16.4 ~ 42V DC (16.4 ~ 30V DC);
Communication distance: 2km, when using CEV cable;
Load capacitance: 0.22μF or less;
Load inductance: 3.3mH or less;
The distance from the power line: 15cm or more;
The input impedance of the receiving instrument connected to the receiving resistor is 10kΩ or more at an ambient temperature of -40 to 85 (-40 to 185 °F) (normal type); -30 to 80 °C (-22 to 176 °F) at 2.4 kHz. ) (with digital meter).
2, working pressure: 7kPaabs (20mmHgabs) ~ flange rated working pressure.
3. The influence of power supply voltage variation is 0.005%/V (21.6~32VDC, 350Ω).
Transmitter: 2-inch pipe installation;
Seal: flange mounted.
5, the installation flange specifications:
ANSI-compliant flange-to-shield side for zigzag machining (according to ANSI B16.5)
6, waterproof structure:
JIS C0920 anti-dip type (equivalent to IECIP67 and NEMA4X)
7, transmitter material:
Flange bolt: Refer to "Model and Specification Code Table"
8, diaphragm seal material:
Capillary: JIS SUS316;
Protection tube: JIS SUS304;
PVC shielding (PVC's large use temperature: 100 ° C).
9, damping time constant:
a time constant of the amplifier assembly and the bellows assembly with the diaphragm seal;
Amplifier component time constant: 0.2 ~ 64 seconds, can be divided into 9 segments;
When the capillary length is 3 m, the code A of the injection solution is obtained at a normal temperature.
(1) Diaphragm sealed differential pressure transmitter adopts high-precision silicon sensor technology from the global ling.
(2) It has excellent static pressure performance (max high static pressure up to 32MPa).
(3) Overload strong static pressure error is better than ≦±0.05%/10MPa.
(4) Zero point and range are adjustable on-site button, the range ratio is 50:1.
(5) Optional HART communication protocol or RS485 digital signal is avaliable.
1 hydraulic and pneumatic control system, liquid level measurement and control
2 petrochemical, environmental protection (CEMS), pharmaceutical
3 power station operation inspection, locomotive brake system
4 thermal power units, light industry, machinery, metallurgy
5 Industrial Process Inspection and Control
6 Building automation, constant pressure water supply, automatic control and detection system