XG3051DP Differential pressure transmitter

Product Introduction:
XG3051DP belongs to the domestically produced 3051 series capacitive intelligent differential pressure transmitter, which adopts the principle of capacitive sensing to convert the pressure difference of the measured medium into 4-20mA+HART standard signal. It can be used to measure process parameters such as differential pressure, liquid level, flow rate, closed container liquid level, pipeline pressure difference, etc. It is widely used in DCS and PLC control systems.

Application industry:
1. Petrochemical industry: reaction kettle liquid level, pipeline flow rate, filter pressure difference, tank liquid level, widely used in explosion-proof conditions.
2. Power industry: monitoring of boiler and turbine systems in power plants, steam and water flow rate, furnace negative pressure, container liquid level, and filter pressure difference.
3. Water treatment/environmental protection: sewage and water purification processes, tank level, pipeline flow rate, filter pressure difference.
4. Metallurgical industry: Measurement of fluid pressure difference, medium liquid level, and process pipeline flow in smelting processes.
5. Paper industry: pulp liquid level, filter pressure difference, process flow measurement.

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FAQ Performance Specifications Functional Specifications Installation Process Connection Instructions Electrical Connections Model and Specification Code Table Physical Specifications

Q1: What parameters can XG3051DP measure?
A: This is a differential pressure transmitter that measures differential pressure at its core. Through differential pressure conversion, it can measure pipeline flow, closed container liquid level, pressure difference before and after filters, and furnace negative pressure. It is not possible to directly measure absolute pressure. When measuring flow, the HART square root function can be activated to output flow signals.

Q2: What is the reason for inaccurate transmitter output signal and large zero drift?
A: There are leaks, blockages, and fluid accumulation in the positive and negative pressure pipes; ② Range migration setting error; ③ Sudden changes in environmental temperature; ④ The membrane is subjected to overpressure impact. Prioritize checking the impulse piping and recalibrate the zero and range using a HART controller.

Q3: What are the precautions for XG3051DP two-wire wiring?
A: Adopting a DC24V two-wire system, without distinguishing between positive and negative signal lines, the maximum circuit load does not exceed 500 Ω; HART communication requires a circuit connected in series with a 250 Ω resistor; Strictly follow explosion-proof specifications for wiring in explosion-proof situations, and ensure reliable grounding of the casing.

Q4: What operating conditions require replacement of non 316L membranes?
A: The tested medium is a highly corrosive medium (strong acid, strong alkali, high chloride ion content), 316L will corrode, and it is necessary to select Hastelloy C, Monel or Tantalum film sheets; Food and pharmaceutical hygiene conditions require customized hygienic membrane structures.

Reference accuracy for adjusting the range
(Including zero-based linearity, hysteresis, and repeatability)±0.075%
If TD＞10 (TD = Maximum Span / Adjusted Span), the accuracy is:±(0.0075 × TD)%
The accuracy for square-root output is 1.5 times the above linear reference accuracy.

Ambient Temperature Effect

Span Code	Total Effect from -20℃ ~ 65℃
A	±(0.45 × TD + 0.25)% × Span
B	±(0.30 × TD + 0.20)% × Span
C/D/E	±(0.20 × TD + 0.10)% × Span
Span Code	Total Effect for -40℃ ~ -20℃ and 65℃ ~ 85℃
A	±(0.45 × TD + 0.25)% × Span
B	±(0.30 × TD + 0.20)% × Span
C/D/E	±(0.20 × TD + 0.10)% × Span
Out-of-Range Effect	±0.075% × Span

Static Pressure Effect

Span Code	Effect Quantity
A	±(0.15%URL + 0.10%Span) / 4MPa
B	±(0.10%URL + 0.075%Span) / 16MPa
C/D/E	±(0.05%URL + 0.05%Span) / 16MPa

Overpressure Effect

Span Code	Effect Quantity
A	±0.2% × Span / 4MPa
B	±0.2% × Span / 16MPa
C/D/E	±0.1% × Span / 16MPa

Long-term Stability

Span Code	Effect Quantity
A	±0.5% × Span/year
B	±0.2% × Span/year
C/D/E	±0.1% × Span/year

Power Supply Effect: ±0.001% /10V (12- 42 V DC), negligible.

Range and Limits
Span Code	Item	kPa	mbar
A	Span	0.1 ~ 1	1 ~ 10
A	Range	−1 ~ 1	−10 ~ 10
B	Span	0.2 ~ 6	2 ~ 60
B	Range	−6 ~ 6	−60 ~ 60
C	Span	0.4 ~ 40	4 ~ 400
C	Range	−40 ~ 40	−400 ~ 400
D	Span	2.5 ~ 250	25 ~ 2500
D	Range	−250 ~ 250	−2500 ~ 2500
E	Span	20 ~ 2000	0.2 ~ 20 bar
E	Range	−500 ~ 2000	−5 ~ 20 bar

Parameter	Specification
Range Limits	Adjustable freely within the upper and lower limits of the range. It is recommended to select the span code with the lowest possible turndown ratio to optimize performance.
Zero Setting	Zero and span can be adjusted to any value within the measuring range, provided that: Calibrated Span ≥ Minimum Span
Mounting Position Effect	Changes of mounting position parallel to the diaphragm cause no zero drift. If position changes by more than 90° relative to the diaphragm surface, a zero offset within <0.4 kPa occurs (correctable by zero adjustment). No span effect.
Output	2-wire, 4~20 mA DC, optional HART digital communication.
	Linear or square-root output selectable.
	Output signal limits: Imin = 3.9 mA, Imax = 20.5 mA
Alarm Current	Low-alarm mode (min): 3.7 mA
	High-alarm mode (max): 21 mA
	No-alarm mode (hold): hold the valid current before fault
	Default: high-alarm mode
Response Time	Damping constant of amplifier unit: 0.1 s; sensor time constant: 0.1~2 s (span & turndown dependent).
	Additional adjustable time constant: 0.1~60 s.
	Non-linear output effect (e.g., square-root) depends on the function and can be calculated.
Warm-up Time	< 15 s
Ambient Temperature	−40 ~ 85 ℃
Ambient Temperature	−20 ~ 65 ℃ (with LCD and fluororubber O-ring)
Storage / Transport Temperature	−50 ~ 85 ℃; −40 ~ 85 ℃ (with LCD display)
Working Pressure	Rated working pressure: 16 MPa / 25 MPa / 40 MPa (three ratings)
Static Pressure Limit	From 3.5 kPa absolute pressure up to rated pressure. The proof pressure can be 1.5 times the rated pressure, applied to both sides of the transmitter simultaneously.
Unidirectional Overload Limit	Unidirectional overload up to rated pressure
Electromagnetic Compatibility (EMC)	See Appendix Table of Electromagnetic Compatibility on next page

Power Supply and Load Conditions
Power Supply Voltage	24 V, R ≤ (Us − 12 V) / Imax kΩ
Power Supply Voltage	(where Imax = 23 mA)
Maximum Power Supply Voltage	42 VDC
Minimum Power Supply Voltage	12 VDC; 15 VDC (with backlit LCD)
Digital Communication Load Range	250 ~ 600 Ω

Electrical Connection
M20×1.5 cable gland; terminal block suitable for conductors of 0.5 ~ 2.5 mm².

Process Connection
The two end faces of the process connection flange are tapped with NPT 1/4 and M10 internal threads.

Process connectivity instructions for unilateral forwarding without forwarding flanges

1/2-NPT Stainless Steel Elliptical Flange (Code 1)		1. Pressure Chamber Flange
		2. O-ring seal
		3. NPT 1/2 Elliptical Flange Connection
		4. Bolt
M20x1.5 Stainless Steel T-Connector (Code 2)		1. Pressure chamber flange
		2. M20×1.5 T-shaped male threaded fitting
		3. Bolt
		4. O-ring
		5. M20×1.5 nut
		6. Pressure lead-in tube

Figure 5: Electrical Connection Diagram

Note: The quick interface function is equivalent to the signal terminal.

Differential Pressure Transmitter Model Selection XG3051DP-

Accuracy

Output

Basic error ±0.05%

4–20mA with HART communication

Basic error ±0.075%

4–20mA with HART communication

Basic error ±0.1%

4–20mA with HART communication

4–20mA analog output

0–100Pa ~ 1kPa (0-10 ~ 100 mmH₂O) / (0-1 ~ 10mbar)

0–200Pa ~ 6kPa (0-20 ~ 600 mmH₂O) / (0-2 ~ 60mbar)

0–400Pa ~ 40kPa (0-40 ~ 4000 mmH₂O) / (0-20 ~ 400mbar)

0–2.5kPa ~ 250kPa (0-0.25 ~ 25 mH₂O) / (0-25 ~ 2500mbar)

0–30kPa ~ 3MPa (0-2 ~ 200 mH₂O) / (0-0.3 ~ 30bar)

0–140kPa ~ 14MPa (0-3 ~ 300 mH₂O) / (0-1.4 ~ 140bar)

Diaphragm Material

Fill Fluid

316L Stainless Steel

Silicone Oil

316L Stainless Steel

Fluorinated Oil

Hastelloy C

Silicone Oil

Hastelloy C

Fluorinated Oil

Gold-plated 316L Stainless Steel

Silicone Oil

Gold-plated 316L Stainless Steel

Fluorinated Oil

FEP Coated 316L Stainless Steel

Silicone Oil

Tantalum

Silicone Oil

Rated Working Pressure

0.2MPa (For Range A only)

7MPa (For Range A only)

16MPa

25MPa

40MPa

Process Connection