Liquid level differential pressure transmitter

Liquid level differential pressure transmitters are used to measure the liquid level, flow rate, and pressure of liquids, gases, or vapors in high working pressure environments, and then convert them into 4-20mA DC signal outputs. -The 1151/3351HP intelligent model can communicate with the HART controller for setting, monitoring, or forming an on-site monitoring system with the upper computer.
1. Performance specifications
(Zero benchmark calibration range, under reference conditions, filled with silicone oil and 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
1.5.1. Digital and intelligent: 6 months, ± 0.1% URL
1.5.2. Simulation, linear: 6 months, ± 0.2% URL
1.3. Environmental temperature impact
1.3.1. Numbers and Intelligence:
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
At a static pressure of 31027kPa, it is ± 0.2% URL. Zero point error can be corrected online through zero adjustment.
1.4.2. Range
Can be corrected to ± 0.25% 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, the 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: 25, 32MPa
2.2. Zero point and range
2.2.1. Digital and intelligent: can be adjusted using the local range and zero buttons, or with a HART controller.
2.2.2. Simulation, linear: 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.
2.5. Damping time constant
Digital and intelligent: The time constant can be adjusted in increments of 0.1 seconds, from the smallest to 16.0 seconds.
Simulation, linear: The time constant can be adjusted from the smallest to 1.67 seconds.

◆ Selection method