• Differential Pressure Transmitter
  • Differential Pressure Transmitter
  • Differential Pressure Transmitter
  • Differential Pressure Transmitter
Differential Pressure Transmitter
  • Applicable Medium
    Gas, liquid
  • Not applicable medium
    solid
  • Product Introduction
    This product is widely used in water plants, oil refineries, sewage treatment plants, building materials, light industry, machinery and other industrial fields to realize the measurement of liquid, gas, and vapor pressure.

Working principle

The Intelligent Differential Pressure Transmitter is an advanced instrument for measuring fluid differential pressure. Differential pressure refers to the difference between the pressure at two different positions, which can convert the differential pressure into a standard electrical signal output and provide a variety of functions and intelligent features.


The two pressures of the measured medium enter the high and low pressure chambers, act on the isolation diaphragms on both sides of the delta element, and are transmitted to both sides of the measurement diaphragm through the isolation sheet and the filling liquid in the element. The electrodes on the measuring diaphragm and the insulating plates on both sides each form a capacitor.

When the pressures on both sides are inconsistent, the measurement diaphragm will be displaced. The displacement is proportional to the pressure difference. Therefore, the capacitances on both sides are not equal. Through the oscillation and demodulation link, it is converted into a signal proportional to the pressure. The working principle of pressure transmitter and absolute pressure transmitter is the same as that of differential pressure transmitter, but the difference is that the pressure in the low-pressure chamber is atmospheric pressure or vacuum.

The A/D converter converts the current of the demodulator into a digital signal, the value of which is used by the microprocessor to determine the input pressure value. The microprocessor controls the work of the transmitter. In addition, it performs sensor linearization. Reset the measurement range. Engineering unit conversion, damping, square extraction, sensor fine-tuning and other operations, as well as diagnosis and digital communication.


Product Features

●Intelligent electronic components consist of only one piece.

●The range ratio is 15:1 or 10:1.

●0-0.6-0-42000KPa.

●Press the local key to adjust the range and zero point.

●It can update the existing TY-1151 (including 1151) various analog transmitters as smart meters.

●Comply with HART protocol, HART communicators 268 and 275 can be used for two-way communication with this smart meter without interrupting the output signal.

● Two-way communication with the host computer in the distributed control system using HART protocol.

●With self-diagnosis and remote diagnosis functions.

●With EEPROM, you are not afraid of losing data after power failure.


Technical Parameters

Performance parameter


Measuring medium

Gas, steam, liquid

Precision

±0.075%, ±0.1%, ±0.2% (including linearity from zero, hysteresis and repeatability)

stability

±0.1%/3 years

power supply

10~36V DC (24V DC recommended)

Reference accuracy of 

range adjustment

If TD>10 (TD=maximum range/adjustment range), 

then: ±(0.075×TD)%

Ambient temperature

-40℃ ~85℃

Measure the temperature 

of the medium

-40℃~120℃

Storage temperature

-40℃ ~85℃

show

LCD、OLED

The display shows the

 temperature of the module

-20℃~70℃(LCD)、-40℃~80℃(OLED)

Physical parameter


Measuring diaphragm

316L, Tantalum, Hastelloy C, Monel

Process connection

Stainless steel 304, 316L

Nuts and bolts

Carbon steel galvanized, stainless steel

Filling fluid

Silicone oil, fluorine oil, etc.

Sealing ring

Nitrile rubber, fluorine rubber, polytetrafluoroethylene

Transmitter housing

Aluminum alloy material, sprayed with epoxy resin on the outside

Shell seal

Nitrile rubber

Nameplate

Stainless steel 304

weight

2.8kg (None: mounting bracket, process connection)

Shell protection level

IP67

Explosion-proof grade

Exd Ⅱ CT6 Gb、Exia Ⅱ CT6 Ga

Power supply and load 

conditions


The power supply voltage is

24V DC R≤(Us-10V)/ImaxΩ where Imax=21 mA

Maximum power supply 

voltage

36V DC

Minimum power supply 

voltage

10V DC

Digital communication 

load range

250~600Ω

Function parameter


Range limit

Within the upper and lower limits of the range, it can be set arbitrarily, as long as the calibration range is greater than or equal to the set range.

It is recommended to select a range with the lowest possible turndown ratio to optimize performance.

Influence of installation location

The change of the installation position will affect the zero position, which can be corrected by zero adjustment, and there is no influence on the range.

Output

Two-wire system 4-20mA, in line with NAMIR NE43 specification, superimposed digital signal (Hart protocol)

Output signal limit

Imin (minimum): 3.9mA Imax (maximum) = 21.0mA

Alarm current

Low report mode (minimum): 3.9mA High report mode (maximum): 21mA (user can preset)

Alarm current default 

setting

High report mode

Fault warning

If the sensor or circuit fails, the automatic diagnosis function will automatically output 22.0mA

Response time

The damping constant of the amplifier component is 0.1s; the time constant of the sensor is 0.1~1.6s, depending on the range and the range ratio.

The additional adjustable time constant is: 0~100s

Preheat time

<15s


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