1151GP Gauge pressure transmitter

1151GP Gauge pressure transmitter

Overview

A pressure transmitter in the general sense is mainly composed of a load cell sensor (also called a pressure sensor), a measurement circuit and a process connection. It can convert physical pressure parameters such as gas and liquid sensed by the load cell sensor into standard electrical signals (such as 4~20mADC, etc.) to supply secondary instruments such as indicating alarms, recorders, and regulators for measurement and indication. and process regulation.

The pressure transmitter is an instrument that accepts pressure variables and converts the pressure changes into standard output signals in a certain proportion after sensing and conversion. The output signal of the transmitter is transmitted to the central control room for pressure indication, recording or control.

Pressure transmitters can be divided into general pressure transmitters (0.001MPa ~ 35MPa), differential pressure transmitters (0 ~ 1.5kPa), and negative pressure transmitters according to the measurement range; from the perspective of accuracy, because The accuracy of my country's national standard is 0.5%. Therefore, in recent years, it can be divided into high-precision pressure transmitters (0.1% or 0.2% or 0.075%) and general pressure transmitters (0.5%).

Pressure transmitters can be divided into capacitive pressure transmitters, diffused silicon pressure transmitters, and monocrystalline silicon pressure transmitters according to the type of sensor.

Working principle

The pressure transmitter transmits the pressure signal to the electronic device, which in turn displays the pressure on the computer.

The principle is roughly:

Convert the mechanical signal of water pressure, such as pressure, into an electronic signal, such as current (4-20mA)

Pressure and voltage or current have a linear relationship, generally a proportional relationship

Therefore, the voltage or current output by the transmitter increases as the pressure increases

This results in a relationship between pressure and voltage or current

The two pressures of the measured medium of the pressure transmitter pass into the high and low pressure chambers, and the pressure in the low pressure chamber adopts atmospheric pressure or vacuum, which acts on the isolation diaphragms on both sides of the delta element (ie, the sensitive element), and passes through Figura. The filling fluid in the spacer and element is transferred to both sides of the measuring diaphragm. The pressure transmitter is composed of a measuring diaphragm and electrodes on both sides of the insulating sheet to form a capacitor. When the pressure on both sides is inconsistent, the measuring diaphragm will be displaced, and its displacement is proportional to the pressure difference, so the capacitances on both sides are not equal. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure.

Features

1) It uses a wide range of measured media, and can measure oil, water and paste compatible with 316 stainless steel and 304 stainless steel, and has a certain anti-corrosion ability.

2) High accuracy, high stability, imported original sensor, good linearity and high temperature stability.

3) Small size, light weight, easy to install, debug and use

4) Stainless steel fully enclosed shell, good waterproof.

5) The pressure sensor directly senses the measured liquid level pressure and is not affected by the foaming and deposition of the medium

●Super measurement performance for pressure measurement

●Digital precision: + (-) 0.05%

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

●Full performance: +(-)0.25F.S

●Stability: 0.25% for 60 months

●Turndown ratio: 100:1

●Measurement rate: 0.2S

●Miniaturized (2.4kg) all stainless steel flange, easy to install

●Process connections are compatible with other products for optimal measurement

Main tech data

Objects of use: liquid, gas and steam

·Output signal, 4~20mADC. (Specially, it can output 4-wire 0～10mADC)

·Power supply: The power supply is 12~45VDC, the digital display with LCD is 15~45VDC, and the general working power is 24VDC.

·Load: related to the power supply. The relationship between the load impedance R and the power supply voltage V is R≤(V-12)Ω

·Span and zero: external continuously adjustable.

·Positive and negative migration: The maximum positive migration is the maximum difference between the URL and the measurement range; the negative migration is not greater than atmospheric pressure.

Ambient temperature range: general transmitter -20℃~70℃, with on-site display -15℃~70℃

Overload pressure, no more than 1.5 times the specified pressure, 1151 pressure transmitter will not be damaged

·Storage temperature: -10℃~55℃

Damping time: continuously adjustable within 0.2 to 1.67 seconds, for micro, low differential pressure and flange transmitters, the damping time is longer

·Volume change, less than 0.16cm3

·Indicator: On-site output indication has ammeter, linear indication 0～100% and square root indication 0～100%, 3-1/2 digit LCD liquid crystal display, word height 13mm. The output is displayed as a percentage.

Start-up time: 2 seconds, no preheating required

·Explosion-proof: Our factory produces two types of explosion-proof transmitters: a flameproof type, b intrinsically safe type.