ALL-DP-2051 Differential Pressure Transmitter
A high-accuracy differential pressure transmitter with HART for flow, level, density and filter monitoring on liquids, gases and steam, with static pressure ratings up to 40 MPa.
Key Features of the ALL-DP-2051 Differential Pressure Transmitter
High accuracy
Reference accuracy of ±0.075% or ±0.1% of calibrated span, including linearity, hysteresis and repeatability.
Square root output is 1.5 times the reference accuracy.
Spans 0.2 kPa to 3 MPa
Capsule B: 0.2 to 6 kPa; C: 0.4 to 40 kPa; D: 2.5 to 250 kPa; F: 30 to 3000 kPa, with the zero fully elevated or suppressed within the range limits.
Overload protection to 40 MPa
Working pressure of 16, 25 or 40 MPa, and one-sided overload up to the maximum working pressure.
HART, linear or square root
Two-wire 4 to 20 mA with HART superimposed, programmable linear or square root, output range 3.9 to 20.5 mA.
Wetted materials for the medium
Isolating diaphragms in 316L, Hastelloy C, gold-plated 316L or tantalum, with silicone or fluorinated oil fill and NBR, FKM or PTFE gaskets.
Display and local set-up
Optional LCD or backlit LCD, external zero adjustment with 0.01% resolution, and local re-ranging.
ALL-DP-2051 Technical Specifications
Tap a group to filter the differential pressure transmitter specifications, or show them all.
- ±0.075%Reference accuracyof calibrated span
- 0.2 kPa to 3 MPaSpansfour capsules
- 40 MPaStatic pressure16, 25 or 40 MPa
- IP67Protection
| Specification | Details |
|---|---|
| Measured variable | Differential pressure of liquids, gases and steam, for flow, level, density and pressure; static pressure on the display or over HART |
| Spans and range limits | B: 0.2 to 6 kPa (±6 kPa); C: 0.4 to 40 kPa (±40 kPa); D: 2.5 to 250 kPa (±250 kPa); F: 30 to 3000 kPa (-500 to 3000 kPa) |
| Reference accuracy | ±0.075% or ±0.1% of calibrated span; if TD > 10, ±(0.005 × TD)%; square root output 1.5 × reference accuracy |
| Stability | ±0.1% of span over 3 years |
| Ambient temperature effect | -20 to 65 °C: ±(0.075 × TD + 0.025)% of span |
| Static pressure effect | ±(0.025% URL + 0.05% span) per 10 MPa |
| Output | 2-wire 4 to 20 mA with HART, linear or square root; output range 3.9 to 20.5 mA |
| Failure alarm | Low 3.7 mA, high 21 mA (standard) or hold last value |
| Response and start-up | Amplifier damping 0.1 s; sensor 0.1 to 1.6 s; adjustable damping 0.1 to 60 s; start-up < 15 s |
| Adjustment and display | External zero, 0.01% resolution; local re-ranging; optional LCD or backlit LCD |
| Working pressure | 16, 25 or 40 MPa (silicone oil); static limits 3.5 kPa abs to the maximum working pressure |
| Process connection | Flanges with 1/4-18 NPT female thread and 7/16-20 UNF bolting; oval flange 1/2 NPT or M20×1.5 connector optional |
| Wetted parts | Sensor body 316L; diaphragm 316L, Hastelloy C, gold-plated 316L or tantalum; cover flanges and connectors 316; fill silicone or fluorinated oil; gaskets NBR, FKM or PTFE |
| Temperatures | Ambient -40 to 85 °C (-20 to 65 °C with LCD or FKM seal); medium -40 to 100 °C; storage -50 to 85 °C |
| Housing and weight | Aluminium with epoxy resin coating; 304 nameplate; approx. 3.3 kg |
| Supply and load | 12 to 42 V DC, 24 V DC standard (15 V minimum with LCD); load R ≤ (Us − 12 V) / 23 mA; 230 to 600 Ω for HART |
| Electrical connection | M20×1.5 cable entry; screw terminals up to 2.5 mm² |
| Protection and EMC | IP67; tested for ESD, radiated RF, burst and surge immunity |
| Hazardous areas | Intrinsically safe and flameproof versions in the order code; confirm availability with us |
Figures from the SUP-2051 datasheet on which the ALL-DP-2051 is based. Confirm the capsule, materials and options for your application before ordering.
Download Data SheetHow does the ALL-DP-2051 work?
Step by step:
Because the high and low sides see the same line pressure, it cancels out and only the difference is measured. Across an orifice plate or pitot tube the difference rises with the square of flow, so the square root output gives a signal proportional to flow.
Where the ALL-DP-2051 is used
Typical applications for this differential pressure transmitter.
- 01Flow measurementWith an orifice plate, venturi or averaging pitot tube, using the square root output.
- 02Level in closed tanksLiquid level in pressurised or vented vessels, with the low side connected to the vapour space.
- 03Filter and strainer monitoringPressure drop across filters, strainers and heat exchangers, to schedule cleaning.
- 04Process industriesChemical, power, metallurgy, petroleum, water and brewing plants.
How the ALL-DP-2051 compares
The highlighted row is this instrument. Tap any other name to open its page.
| Instrument | Principle | Range | Output | Supply | Protection |
|---|---|---|---|---|---|
| Gauge and absolute pressure | |||||
| ALL-P-P400 pressure transmitter | Piezoresistive (diffused silicon) | -1 to 600 bar (-0.1 to 60 MPa) | 4 to 20 mA, 0 to 10 V, 1 to 5 V, RS485 | 9 to 32 V DC | IP65 |
| Differential pressure | |||||
| ALL-DP-2051 differential pressure transmitter | Differential pressure (silicon sensor) | Spans 0.2 kPa to 3 MPa, static to 40 MPa | 4 to 20 mA + HART, linear or square root | 12 to 42 V DC | IP67 |
| Pressure sensor with switch outputs | |||||
| Balluff BSP00Y4 IO-Link pressure sensor | Ceramic measuring cell | 0 to 10 bar | IO-Link, 2 × PNP/NPN, 4 to 20 mA or 0 to 10 V | 18 to 30 V DC | IP67 |
From Selection to a Working Signal in Your Control System
A pressure transmitter is only as useful as the signal that reaches the control room. Proplant PCE handles the steps around the instrument as well as the instrument itself.
Application review
We check the medium, pressure range, peaks, temperature, process connection and output before recommending an instrument.
Supply
Instruments from the brands on this page, with datasheets and calibration certificates for your engineering file.
Installation
Mechanical installation, earthing, cabling and termination by our E&I team.
Integration
Signal wiring and configuration into your PLC or SCADA, including Siemens systems.
What to tell us so we can recommend an instrument
Tick off what you already know. We will check the ALL-DP-2051 against your conditions, or suggest a better fit from our range.
Other instruments to consider
ALL-DP-2051 FAQ
What is a differential pressure transmitter used for?
It measures the difference between two pressures. Typical uses are flow across an orifice plate or pitot tube, liquid level in closed tanks, density, and the pressure drop across filters.
How accurate is the ALL-DP-2051?
Reference accuracy is ±0.075% or ±0.1% of calibrated span, with stability of ±0.1% of span over three years.
What spans are available?
Four capsules: 0.2 to 6 kPa, 0.4 to 40 kPa, 2.5 to 250 kPa and 30 to 3000 kPa. The zero can be elevated or suppressed within the range limits.
What static pressure can it handle?
The maximum working pressure is 16, 25 or 40 MPa depending on the version, and either side can be overloaded up to that pressure.
Does it support HART?
Yes. HART is superimposed on the 4 to 20 mA signal for remote set-up, diagnostics and reading the static pressure.
When should I use the square root output?
For flow measurement with an orifice plate, venturi or pitot tube, where the differential pressure rises with the square of the flow. Use linear output for level and filter monitoring.
Can Proplant PCE supply it with a pitot tube or orifice?
Yes. We can supply the transmitter with an Itabar averaging pitot tube, manifolds and impulse fittings, sized for your pipe and flow range.
Let's Discuss Your Pressure Application
Tell us the medium, the pressure range and what the signal needs to do. We will come back with a recommendation and the datasheet.