Products
LF3051-DWF Remote-Seal Differential Pressure Transmitter
Measuring Range:
10kPa-1MPa
Output Signal:
4-20mA, 4~20mA/HART, Modbus-RTU/RS485, Customer
Reference Accuracy:
±0.2% URL, ±0.5% URL
Measuring Medium:
Pressure, Level, Differential Pressure, Density, Interface, Flow
Ingress Protection:
IP67
Stability:
±0.2% URL/5 Years
Product Description
Product Overview
The LF3051-DWF remote-seal differential pressure transmitter is built around a single-crystal silicon sensor chip manufactured with advanced MEMS technology, housed in a twin-diaphragm floating capsule with a modular architecture. Combined with closely controlled production processes, this delivers high accuracy and exceptional stability. An embedded intelligent signal-processing module unites pressure and temperature compensation, so the transmitter holds reliable measurement accuracy and excellent long-term stability across wide variations in static pressure and temperature.
The transmitter is assembled from an LF3051-DP transmitter body and welded remote-seal flanges connected by capillaries. Process pressure applied to the remote seal first deflects the seal diaphragm, is transferred through the fill fluid and along the capillary, and finally reaches the sensing element. The instrument measures gauge or absolute pressure of liquids, gases or steam and converts it into a 4–20 mA DC output with superimposed HART communication.
Key Features
- High accuracyHigh-precision single-crystal silicon sensor chip; accuracy up to ±0.05% of span.
- Strong overload capabilityDual overload-protection diaphragm design; single-side overpressure up to 40 MPa.
- Excellent environmental adaptabilityIntelligent static-pressure and temperature compensation cancels the effects of temperature, static pressure and overload, reducing total field measurement error to a minimum.
- Excellent long-term stabilityStability maintained within ±0.2% URL/5 years.
- Flexible remote commissioningParameter setting and configuration are performed locally or remotely through HART or RS485 communication and the panel keys.
Applications
Oil, chemical and petrochemicalPaired with flow elements to provide accurate pressure and level measurement in flow-measurement pipelines and storage tanks.
Power generation and city gasPressure, flow and level measurement where high stability and high accuracy are essential.
Pulp and paperFurnace and kiln pressure, vacuum (negative pressure) measurement and other duties that demand high stability and accuracy.
Steel, non-ferrous metals and ceramicsPressure, flow and level measurement of chemically aggressive and corrosive liquids.
Machinery and shipbuildingApplications where pressure, flow and level are tightly controlled and stable measurement is critical.
Performance Specifications
| Model | LF3051-DF remote-seal differential pressure transmitter |
| Measured medium | Pressure of liquids, gases or steam |
| Measurement type | Differential pressure |
| Output signal | 4–20 mA + HART digital signal; RS485 serial signal |
| Response time | Amplifier damping constant 0.1 s; sensor and remote-seal time constant 0.2–6 s, depending on sensor range, turndown ratio, capillary length and fill-fluid viscosity; additional adjustable time constant 0.1–60 s |
| Range limits | The minimum span is the greater of the value shown in the range table and the minimum span of the remote-seal flange table; the adjusted span must not be smaller than the minimum span. The maximum span is the smaller of the transmitter body maximum and the rated pressure of the remote-seal flange. |
| Zero effect of mounting position | Correctable; see installation notes |
| Ambient temperature | Minimum: depends on fill fluid · Maximum: 85 °C · −20 to +65 °C with display and FKM seal |
| Storage temperature | Minimum: depends on fill fluid · Maximum: 85 °C |
| Process medium temperature | −30 to +400 °C |
| Relative humidity | 0–100 % |
| Shock resistance | 50 g for 11 ms |
| Vibration resistance | 2 g at 2–500 Hz |
| Electromagnetic compatibility | See EMC schedule |
| Pressure limit of transmitter body | From 3.5 kPa absolute to the rated pressure; protection pressure up to 1.5 × rated pressure, applied simultaneously to both sides |
Measuring ranges and recommended turndown
| Range code | Measuring range | Recommended turndown |
|---|---|---|
| 0B | 0–1 kPa to 6 kPa | 6:1 |
| 0C | 0–4 kPa to 40 kPa | 10:1 |
| 0E | 0–25 kPa to 250 kPa | 10:1 |
| 0F | 0–100 kPa to 1 MPa | 10:1 |
| 0G | 0–200 kPa to 3 MPa | 15:1 |
Minimum span by remote-seal flange
| Seal type | Nominal size | Single remote seal | Dual remote seal |
|---|---|---|---|
| Flat type | DN 50 / 2″ | 10 kPa | 10 kPa |
| DN 80 / 3″ | 6 kPa | 2 kPa | |
| DN 100 / 4″ | 6 kPa | 2 kPa | |
| Insert (extended) type | DN 50 / 2″ | 16 kPa | 16 kPa |
| DN 80 / 3″ | 6 kPa | 2 kPa | |
| DN 100 / 4″ | 6 kPa | 2 kPa |
Fill fluid, operating temperature and minimum working static pressure
| Fill fluid | Silicone oil (G) | High-temp. silicone oil (HG) | Ultra-high-temp. silicone oil (GG) | Food-grade oil (S) |
|---|---|---|---|---|
| Density at 25 °C | 960 kg/m³ | 980 kg/m³ | 1 020 kg/m³ | 937 kg/m³ |
| Operating temperature | −30 to 200 °C | −10 to 350 °C | −10 to 400 °C | 0 to 250 °C |
| Static pressure at 20 °C | > 10 kPa abs | > 10 kPa abs | > 10 kPa abs | > 10 kPa abs |
| Static pressure at 100 °C | > 25 kPa abs | > 25 kPa abs | > 25 kPa abs | > 25 kPa abs |
| Static pressure at 150 °C | > 50 kPa abs | > 50 kPa abs | > 50 kPa abs | > 50 kPa abs |
| Static pressure at 200 °C | > 75 kPa abs | > 75 kPa abs | > 75 kPa abs | > 75 kPa abs |
| Static pressure at 250 °C | — | > 100 kPa abs | > 100 kPa abs | > 100 kPa abs |
| Static pressure at 350 °C | — | > 100 kPa abs | > 100 kPa abs | — |
| Static pressure at 400 °C | — | — | > 100 kPa abs | — |
Operating conditions outside the fill-fluid, temperature and static-pressure envelope above can be met by special design — please state the requirement at the enquiry stage.
Mechanical Construction
| Remote-seal flange rating | ANSI 150–600 psi; DIN PN 1.6–10 MPa |
| Diaphragm | Stainless steel 316L · Hastelloy C-276 · tantalum · gold-plated |
| Process connection material | Stainless steel 304 or 316 |
| Nuts and bolts | Stainless steel A2-70 · zinc-plated carbon steel 12.8 |
| Transmitter housing | Aluminium alloy with epoxy-resin coating · stainless steel |
| Fill fluid | Silicone oil · high-temperature silicone oil · ultra-high-temperature silicone oil · food-grade oil |
| Process connection | Low-pressure side: NPT 1/4 and UNF 7/16 female thread. High-pressure side: flange to ANSI or DIN standard, mounted directly. |
| Electrical connection | M20 × 1.5 cable gland; terminals accept 0.5–2.5 mm² conductors |
| Power supply and load | 10.5–45 V DC; load resistance 0–600 Ω (HART communication range shown on the load diagram) |
| Ingress protection | IP65 · IP67 (explosion-proof versions) |
| Weight | Single seal: DN 50/2″ approx. 7–10 kg; DN 80/3″ approx. 8–11 kg; DN 100/4″ approx. 9–12 kg. Dual seal: DN 50/2″ approx. 10–16.5 kg; DN 80/3″ approx. 12–18 kg; DN 100/4″ approx. 14–21 kg. |
Model and Suffix Codes
| Category | Code | Description |
|---|---|---|
| Accuracy class | D | 0.25% |
| C | 0.1% | |
| B | 0.075% | |
| Measuring range | 0B | 0–2 kPa to 6 kPa |
| 0C | 0–4 kPa to 40 kPa | |
| 0E | 0–2.5 kPa to 250 kPa | |
| 0F | 0–10 kPa to 1 MPa | |
| 0G | 0–30 kPa to 3 MPa | |
| Rated working pressure | P2 | 16 MPa |
| P3 | 25 MPa | |
| P4 | 40 MPa | |
| Transmitter output | E | 4–20 mA + HART digital signal |
| R | RS485 | |
| I | I²C | |
| U | 4–20 mA | |
| F | FF (Foundation Fieldbus) | |
| Wetted parts material | L | 316L |
| HC | Hastelloy C-276 | |
| TH | Tantalum | |
| TI | Titanium | |
| Gd | 316L, gold-plated | |
| Mn | Monel | |
| Sensor fill fluid | G | Silicone oil |
| F | Fluorinated oil | |
| S | Vegetable oil | |
| Electrical connection | L1 | Aluminium housing, M20 × 1.5 |
| L2 | Aluminium housing, NPT 1/2 | |
| G1 | Stainless steel 316L housing, M20 × 1.5 | |
| G2 | Stainless steel 316L housing, NPT 1/2 | |
| G3 | Stainless steel 316L housing, M20 × 1.5 | |
| G4 | Stainless steel 316L housing, NPT 1/2 | |
| Display | M0 | No display |
| M1 | Low-power LCD display | |
| M2 | Low-temperature LCD display | |
| Mounting bracket | W | No mounting bracket |
| P | Flat mounting bracket | |
| Z | Right-angle mounting bracket | |
| Approval | E0 | Non-explosion-proof |
| E1 | Intrinsically safe, Ex ia IIB T6 Ga | |
| E2 | Flameproof, Ex db IIC T6 Gb | |
| Flange size | F0 | DN 25 |
| F1 | DN 50 | |
| F2 | DN 80 | |
| F3 | DN 100 | |
| F4 | DN 2″ | |
| F5 | DN 3″ | |
| F6 | DN 4″ | |
| F7 | Other | |
| Flange standard | 1 | DIN PN 10/16, HG/T 20592-2009 (Chinese chemical industry standard) |
| 2 | DIN PN 25/40, HG/T 20592-2009 | |
| 3 | DIN PN 64, HG/T 20592-2009 | |
| 4 | DIN PN 100, HG/T 20592-2009 | |
| 5 | ANSI 150, ASME B16.5 | |
| 6 | ANSI 300, ASME B16.5 | |
| 7 | ANSI 600, ASME B16.5 (DN 4″ excluded) | |
| 8 | Other | |
| P13 | PN 10 MPa | |
| P21 | 150 psi | |
| P22 | 300 psi | |
| P23 | 600 psi | |
| Flange fill fluid | G | Silicone oil |
| DG | Low-temperature silicone oil | |
| GG | Ultra-high-temperature silicone oil | |
| HG | High-temperature silicone oil | |
| F | FL oil | |
| S | Vegetable oil | |
| Wetted parts material (flange) | L | 316L |
| HC | Hastelloy C-276 | |
| TH | Tantalum | |
| TI | Titanium | |
| Gd | 316L, gold-plated | |
| TF | PTFE-coated | |
| PF | PTFE-lined | |
| Capillary length | H = | High-pressure side, actual capillary length (unit: m) |
| L = | Low-pressure side, actual capillary length (unit: m) |
Remote-Seal Flange Dimensions
| Nominal size | Rating | A | B | C | D | E | F | f | Bolts | Thread |
|---|---|---|---|---|---|---|---|---|---|---|
| DN 25 | PN 10/16 bar | 115 | 85 | 65 | 18 | 4 | 14 | 2 | 4 | M12 |
| PN 63/100 bar | 140 | 100 | 65 | 24 | 4 | 18 | 2 | 4 | M16 | |
| DN 50 | PN 10/40 bar | 165 | 125 | 95 | 20 | 4 | 18 | 2 | 4 | M16 |
| PN 63 bar | 180 | 135 | 95 | 26 | 4 | 22 | 2 | 4 | M20 | |
| PN 100 bar | 195 | 145 | 95 | 28 | 4 | 26 | 2 | 4 | M24 | |
| DN 80 | PN 10/16 bar | 200 | 150 | 127 | 20 | 8 | 18 | 2 | 8 | M16 |
| PN 25/40 bar | 200 | 160 | 127 | 24 | 8 | 18 | 2 | 8 | M16 | |
| PN 63 bar | 215 | 170 | 127 | 28 | 8 | 22 | 2 | 8 | M20 | |
| PN 100 bar | 230 | 180 | 127 | 32 | 8 | 26 | 2 | 8 | M24 | |
| DN 100 | PN 10/16 bar | 220 | 180 | 157 | 20 | 8 | 18 | 2 | 8 | M16 |
| PN 25/40 bar | 235 | 190 | 157 | 24 | 8 | 22 | 2 | 8 | M20 | |
| PN 63 bar | 250 | 200 | 157 | 30 | 8 | 26 | 2 | 8 | M24 | |
| PN 100 bar | 265 | 210 | 157 | 36 | 8 | 30 | 2 | 8 | M27 | |
| 2″ | 150 psi | 150 | 120.7 | 95 | 19.5 | 4 | 19 | 2 | 4 | M16 |
| 300 psi | 165 | 127 | 95 | 22.7 | 8 | 19 | 2 | 8 | M16 | |
| 600 psi | 165 | 127 | 95 | 32.4 | 8 | 19 | 2 | 8 | M16 | |
| 3″ | 150 psi | 190 | 152.4 | 127 | 24.3 | 4 | 19 | 2 | 4 | M16 |
| 300 psi | 210 | 168.3 | 127 | 29 | 8 | 22 | 2 | 8 | M20 | |
| 600 psi | 210 | 168.3 | 127 | 38.8 | 8 | 22 | 2 | 8 | M20 | |
| 4″ | 150 psi | 230 | 190.5 | 157 | 24.3 | 8 | 19 | 2 | 8 | M16 |
| 300 psi | 255 | 200 | 157 | 32.2 | 8 | 22 | 2 | 8 | M20 |
Installation Notes
- The transmitter body can be fixed in any position. Best practice is to keep the process flange axis vertical; any positional deviation produces a zero offset that can be corrected. The electronics housing rotates up to 360° and is locked in position by the locating screw.
- Remote pressure or absolute-pressure flanges are bolted to mating flanges that comply with ANSI or DIN standards; the mating flange must be fitted with a soft gasket and fixing bolts and nuts (bolts and nuts can be supplied by the customer).
- For double-flange remote-seal transmitters, the capillary assemblies and remote-seal flanges should be installed at the same ambient temperature wherever possible. The minimum bend radius of the capillary is 75 mm — never coil or wind the capillary.
- The load diagram gives the permissible load resistance against supply voltage; HART communication requires a minimum loop resistance, as shown on the diagram.
- Explosion-proof versions (Ex ia IIB T6 Ga, Ex db IIC T6 Gb) must be wired in accordance with the relevant certificate and local installation codes.
Detail Information
| Brand Name: | Puride |
| Model Number: | LF3051-DWF |
| MOQ: | 1piece |
| Price: | Price on request |
| Payment Terms: | L/C,D/A,D/P,T/T |
| Supply Ability: | 5,000 sets / month |
