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.
●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.
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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