Diaphragm sealed pressure transmitter

I. Product Overview:

ZWA438W series diaphragm sealed pressure transmitter is a new type of transmitter which imports advanced technology and equipment from abroad. The key raw materials, components and components are all imported. After rigorous assembly and testing, the whole machine has the characteristics of advanced design principle, complete varieties and specifications, simple installation and use. Because the isolation diaphragm is very thin, it is the weak link of corrosion resistance, so the liquid-contacting diaphragm material has 316L, Harrington C-276, Monel, Tantalum and so on. It can be applied to different anti-corrosion requirements, and can be reasonably selected according to the measured medium concentration, humidity, pressure and other parameters, which are suitable for the appendix to give the reference table of corrosion resistance.

2. Small lightweight design:

ZWA438W series diaphragm sealed pressure transmitter reduces the weight of this model to half of the original model due to the use of ASIC amplifier design to reduce packaging, as well as diaphragm box construction and flange miniaturization. ASIC design not only reduces the number of parts, but also improves the reliability of the amplifier.

3. Fieldbus communication capability:

Fieldbus is a bidirectional digital communication system, an innovative technology for configuring instrumentation control system, and also a promising replacement product. It is used to replace the standard 4-20mA analog communication widely used in field instruments.

ZWA438W series diaphragm sealed pressure transmitter provides two Fieldbus modes, FOUNDATION & #8482; fieldbus low voltage mode and PROFIBUS PA equipment, in order to achieve the collaboration between Zhongwei measurement and control and other suppliers. In software aspect, EJA series uses two AI function blocks to calculate differential pressure and static pressure, thus realizing flexible instrument configuration.

4. Application occasions:

ZWA438W series diaphragm sealed pressure transmitter is used to measure the pressure of liquid, gas and steam, and then output 4-20mADC signal corresponding to the pressure. Because they can communicate with HART375 hａnd manipulator, they can be set and monitored remotely.

V. Main characteristics:

1. Super measurement performance for pressure, differential pressure, liquid level and flow measurement;

2. Digital accuracy: +(-) 0.2%;

3. Simulation accuracy: +(-) 0.75% +(-) 0.1% F.S.

4. Full performance: +(-) 0.25F.S.

5. Stability: 0.25% for 60 months;

6. Range ratio: 100:1;

7. Measurement rate: 0.2S;

8. Miniaturized (2.4kg) stainless steel flange, easy to install;

9. Process connection is compatible with other products to realize measurement.

10. The only sensor in the world that uses H-alloy sheath (technology) achieves excellent cold and thermal stability.

11. Intelligent transmitter with 16-bit computer;

12. Standard 4-20mA, with HART protocol based digital signal, remote control;

13. Support the upgrading of fieldbus and field control technology.

6. 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: less than 0.22 uF;

Load inductance: less than 3.3mH;

Spacing with power cord: more than 15 cm;

When the input impedance of the receiving instrument connected to the receiving resistance is 2.4 kHz, the ambient temperature above 10 K is -40-85 (-40-185 degrees F) (general type); - 30-80 (-22-176 degrees F) (with digital head).

2. Working pressure: 7kPaabs (20mm Hgabs) - rated working pressure of flange.

3. The influence of power supply voltage variation is 0.005%/V (21.6-32 VDC, 350_).

4. Installation:

Transmitter: 2-inch pipeline installation;

EJA438W Diaphragm Sealed Pressure Transmitter Seal: Flange Installation.

5. Installation flange specifications:

Sawtooth processing on the contact side of ANSI flange and gasket (according to ANSIB16.5)

6. Waterproof structure:

JIS C0920 anti-immersion type (equivalent to IECIP67 and NEMA4X)

7. Transmitter Material:

Flange: JISSUS14A

Flange Bolts: Refer to "Model and Specification Code Table"“

8. Material of diaphragm seals:

Capillary: JIS SUS316;

Protection tube: JIS SUS304;

PVC shielding (Ambassador Zui temperature of PVC: 100 C).

9. Damping time constant:

The time constants of the amplifier assembly and the diaphragm box assembly with diaphragm seals are added.