Diaphragm sealed differential pressure transmitter

I. Product Overview:

The key raw materials, components and components of ZWA118W series diaphragm sealed differential pressure transmitter are imported or jointly manufactured. The whole machine has been rigorously assembled and tested. The product has the characteristics of advanced design principle, complete varieties and specifications, and simple installation and use. Because this model fully integrates the structural advantages of two kinds of transmitters (Rosemount 3051 and Yokogawa EJA), which are popular in China and widely used at present, it gives users a refreshing feeling, and has strong versatility and substitution ability. In order to adapt to the continuous improvement and development of domestic automation level, this series of products not only have compact and exquisite design, but also have the intelligent function of HART Fieldbus protocol.

2. Small lightweight design:

ZWA118W Series Diaphragm Sealed Differential 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 and the miniaturization of diaphragm box construction and flange. 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.

ZWA118W series diaphragm sealed differential pressure transmitters provide two Fieldbus modes, FOUNDATION & #8482; fieldbus low-voltage mode and PROFIBUS PA equipment, in order to achieve the collaboration between Asder and other suppliers. In software aspect, ZWA118 series uses two AI function blocks to calculate differential pressure and static pressure, thus realizing flexible instrument configuration.

IV. Product Application:

It is used to measure the flow, liquid level, density and pressure of gases, liquids and vapors, and then convert them into current signal output of 4-20 mADC. ZWA118W, ZWA118N and ZWA118Y can also communicate with each other through BRAIN or CENTUM CS/uXL or HART275, through which they can be set up and monitored.

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. Volume 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;

Seals: 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.

The time constant of the amplifier module is 0.2-64 seconds, which can be set in 9 segments.

When the length of the capillary is 3M and the code A of the injected liquid is A, the value obtained at normal temperature is obtained.

7. Transmitters with remote transmission devices are suitable for the following working conditions:

1. It is necessary to isolate the high temperature medium from the transmitter.

2. Measuring medium has corrosive effect on sensor of transmitter.

3. The measured medium solidifies or crystallizes due to environmental or temperature changes.

4. It is necessary to purify the measuring head strictly to replace the measured medium.

5. Suspension liquid or high viscosity medium.

6. The measuring head must be kept clean and hygienic.

7. Measurement of sealed pressure vessels.

8. Specification and range: