Domestic intelligent differential pressure transmitter

Intelligent differential pressure transmitterUsed to measure the liquid level, density, and pressure of liquids, gases, or vapors, and then convert them into 4-20mA DC signals for output.Intelligent differential pressure transmitterCan be connected to HART The handheld devices communicate with each other to set, monitor, or form an on-site monitoring system with the upper computer. 1151/3351DP typeIntelligent differential pressure transmitterIt is a new product developed by Jinhu Dahua Instrument according to on-site requirements. It can be operated without a manual controller and can achieve on-site zero adjustment, configuration, and other operations through button pressing.
Intelligent differential pressure transmitter1. Performance specifications (zero benchmark calibration range, under reference conditions, filled with silicone oil, 316 L stainless steel isolation diaphragm). ）

1.1. Reference accuracy
1.1.1. Digital and intelligent: ± 0.1% calibration range
1.1.2. Simulation, linear: ± 0.2% calibration range
1.2. stability
1.2.1. Digital and intelligent: 6 months, ± 0.1% URL
1.2.2. Simulation, linear: 6 months, ± 0.2% URL
1.3. Environmental temperature impact
Intelligent differential pressure transmitter1.3.1. Digital and intelligent
Zero point error: ± 0.2% URL/56 ℃
Overall error: ± (0.2% URL+0.18% calibration range)/56 ℃
1.3.2. Simulation, Linear
Zero point error: ± 0.5% URL/56 ℃
Overall error: ± (0.5% URL+0.5% calibration range)/56 ℃
1.4. Static pressure influence
1.4.1. Zero point:
For ranges 4 to 8, the URL is ± 0.2% at 13790kPa; The other ranges are ± 0.25% URL. Zero point error can be corrected online by resetting to zero.
1.4.2. Range:
Can be corrected to ± 0.25% output reading/6895kPa, for range 3, can be corrected to ± 0.5% output reading/6895kPa
1.5. Vibration impact
In any axial direction, the vibration effect at 200Hz is ± 0.05% URL/g
1.6. Power supply impact
Less than ± 0.005% output range/volt.

1.7. Load impact:
There is no load impact unless there is a change in the power supply voltage.
1.8. Electromagnetic interference/radio frequency interference (EMI/RFI impact)
When the field strength reaches 30V/M from 20 to 1000MHz,
Output drift is less than ± 0.1% of the range.
1.9. Installation location impact
The zero drift is at most ± 0.25kPa. All zero drift can be corrected; Has no impact on the measurement range.
2. Functional specifications
2.1. Measurement range: Differential pressure: 0-1.3~6890KPa
Static pressure: 4, 10, 14MPa
2.2. Zero point and range
2.2.1. Digital and Intelligent:
It can be adjusted using the local range and zero buttons, or remotely using a HART controller.
2.2.2. Simulation and linearity:
The range and zero point are continuously adjustable.
2.3. Zero point positive and negative transfer
When zero point negative shift occurs, the lower limit of the range must be greater than or equal to - URL; When zero point is shifted forward, the upper limit of the range must be less than or equal to+URL. Verify that the range is greater than or equal to the smallest range.
2.4. output
Digital and intelligent:
4～20mA DC， Users can choose linear or square root output, and the digital process variable is superimposed on a 4-20mA DC signal, which can be used by upper computers using the HART protocol.
Simulation, linear:
4～20mA DC, Linear with process pressure.

Intelligent differential pressure transmitter◆ Selection method