First, product overview

Absolute pressure transducers enable pressure measurements of degassing systems, still towers, evaporators, crystallizers, etc., allowing overpressure up to 10Mpa. Absolute pressure transmitter is a new series of products specialized in vacuum measurement and control, which completely solves the difficult problem of vacuum measurement. It is widely used in pharmaceutical, medical equipment, aerospace, scientific research, leak detection, automation equipment and other fields. Objects of use: liquids, gases and vapors.

Absolute pressure refers to the pressure exerted directly on the surface of a container or object, that is, the actual pressure under which the object is subjected. Its zero point is J.D vacuum and its symbol is PABS (ABS is the subscript). The pressure caused by a thick layer of atmosphere surrounding the earth's surface is called "atmospheric pressure" (symbol B). The pressure measured by pressure gauges, vacuum gauges, U-shaped tubes and other instruments is called "surface pressure" (also called relative pressure). The "surface pressure" takes atmospheric pressure as the starting point and the symbol is Pg.

The absolute pressure transmitter is a new type of transmitter produced by our company with the introduction of foreign technology and equipment. The key raw materials, components and spare parts are imported. The whole machine has been strictly assembled and tested. As the appearance of this model fully integrates the structural advantages of the two popular and widely used transmitters (Rosemount 3051 and Yokogawa EJA) in China, it gives users a fresh feeling. At the same time with the traditional 1151, CECC and other products can be directly replaced on the installation, has a strong versatility and alternative ability. In order to suit the continuous improvement and development of domestic automation level, this series of products in addition to small and exquisite design, but also introduced with HART fieldbus protocol intelligent function.

Two, product characteristics

1. High accuracy, good stability, two-wire system input (special four-wire system);

2. Solid components, plug-in printed circuit boards; Small, light weight, strong vibration resistance;

3. Range, continuous adjustable outside the zero; Positive migration can be up to 500% and negative migration can be up to 600%

4. Damping can be adjusted; Good unidirectional overload protection;

5. No mechanical moving parts, less maintenance work; The whole series of unified structure, the parts are interchangeability;

6. The diaphragm material of contact medium can be selected; (316L, TAN, HAS-C, MONEL and other corrosion resistant materials)

7. Explosion-proof structure, all-weather use; Intelligent HART Fieldbus protocol

3. Technical parameters

Objects to use: liquids, gases, and vapors

Measuring range: 0 ~ 0.1Kpa to 0 ~ 40Mpa

Output signal: 4 ~ 20mA DC

Power supply: 12 to 45VDC, usually 24V power supply

Field display: Pointer type 0 ~ 100% scale display, LED digital display, LCD liquid crystal display is optional

Explosion-proof grade: flameproof dIIBT4, intrinsically safe iaIICT6

Accuracy: ±0.2%, ±0.25%, ±0.5%

Stability: No more than the basic error J.D value of the large scale z.u within six months

Diaphragm: 316 stainless steel, Hastelloy C-276, Monel or bile

Exhaust/exhaust valve: 316 stainless steel, Hastelloy C, Monel

Flange and joint: 316 stainless steel, Hastelloy C, Monel

Contact medium O - ring: nitrile rubber, fluorine rubber

Filling liquid: silicone oil or inert oil

Bolt: 316L stainless steel

Shell material: low copper aluminum alloy

Pressure connecting piece: flange, NPT1/4, center distance 54mm; Fitting NPT1/2 or M20×1.5 male thread, ball conical, sealed, center distance 50.8, 54, 57.2mm with fitting (NPT taper thread according to GB/T12716-91)

Signal connecting hole: G1/2

Iv. Product specifications

Absolute pressure transmitter

L Membrane box M membrane box A membrane box

The measuring range is 0~10kPa abs

(0~2.95inHg abs) 0~130kPa abs

(0~38inHg abs) 0~3MPa

(0~430psia)

Measuring range 0.67~10kPa

(0.2~2.95inHg) 1.3~130kPa

(0.38~38inHg) 0.03~3MPa

(4.3 ~ 430 psi)

Accuracy ±0.5% ±0.2% ±0.1%

Protection classes IP67, NEMA 4X, and JIS C0920 are immersion resistant

Explosion-proof specification CSA, IECEx

Output signal 4 to 20mA DC or FOUNDATION™ Fieldbus or PROFIBUS PA two-wire digital communication

Power supply HART:10.5~42V DC (basic safety type :10.5~ 30V DC)

Ambient temperature -40~85℃ (-40~185℉) (normal type)

-30~80℃ (-22~176℉) (internal indicator)

Process temperature M and A box: -40~120℃ (-40~248℉) (normal type)

L Membrane box: -40~100℃ (-40~212℉) (normal type)

z.u high overpressure 500kPa abs

(72psia) 500kPa abs

(72psia) 4.5MPa abs

(645psia)

Install a 2-inch pipe

Liquid receiving parts material membrane box SUS316L (diaphragm: Hastelloy C-276)

Room flange SUS316

Case Aluminum alloy or SUS316 Stainless steel (optional)