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Differential Pressure Flowmeters
Differential Pressure Flow Meters consist of a flow body containing some type of throttle restriction with known characteristics, such as a venturi, orifice, cone, or segmented wedge. This restriction creates a differential pressure between a pressure tap (P1) upstream of the restriction and a pressure tap downstream of the restriction (P2) which is proportional to the square of the volumetric flow rate. For a more detailed discussion of the principle of operation, please go to: http://www.smartmeasurement.com/flow-meters/differential-pressure/measuring-principle
Differential Pressure Flow Meters are excellent for very low flows or low Reynolds numbers (Re. < 500), high-viscosity fluids which contains dust or solid particles, or applications for measuring flows of liquid cement, crude oil flow meters, asphaltic oil, coal-tar oil, wastewater, hard pulp, carbon black solution, asphaltic oil, coal-tar oil, wastewater, hard pulp, carbon black solution, as well as two phase flows. SmartMeasurementTM offers Cone-Type Differential Pressure flowmeters as well as a wide selection of Differential Pressure (DP) transmitters that can be used with a customer-supplied Differential Pressure element. Volumetric calculations can be performed with the ALDP-3051 transmitter with the ALDP-3051MV multivariable transmitter has the ability to perform mass flow calculations. Please see the Differential Pressure matrix below for the best fit device for your application.
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Differential Pressure CapabilitiesHover mouse over icon for application notes
| Technology | Model/ Series |
Gas Flow | Liquid Flow | Steam Flow | Line Size | Temperature | Pressure | Viscosity | Accuracy | Considerations |
| DP Meters | ALDP |  |
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Must include DP transmitter |
Differential Pressure Flow Meters
| ALDP Family | ||||||||||
| Technology | Model | Diameters | Flow Rate | Accuracy | Pressure | Temperature | Materials | Approvals | Special Features | |
 Cone Meters |
ACONE | ½"~120" (15~3000mm) |
Based on Re > 8000 For Gases, Liquid and Steam | Liquid: ± 0.5% of Rd, Gas & Steam: ± 1.0% of Rd |
61,000 psig (420 Mpa) |
320~1500°F (-196~850 °C) |
304L/SS 306L, CPVC ,PTFE, Brass, A106B A335-P11, A335-P22, Dual - Phase Steel, Inconel 625, Hastelloy C276 | CE and ExibIICT6 or Explosion Proof ExdIICT6 | Piping requirements; ONLY 0-3 Φ upstream and 0-1 Φ downstream | |
 .jpg) DP Transmitters |
ALDP-1151 |
Depends on primary element (see ACONE) | Depends on primary element (see ACONE) | Accuracy GRADE 0.075, 0.2, 0.5 | DP: 0～0.16 kPa to 0～10 Mpa, RP max 0～40 Mpa, min 0～0.16 Kpa AP max 0～25 Mpa, min 0～20 Kpa |
-40~256 °F (-40 ~ 125 °C) |
316SS, Tantalum and other exotic materials | CE and ExibIICT6 or Explosion Proof ExdIICT6 | ART protocol, Profibus, or FOUNDATION fieldbus | |
 DP-MV-Multivariable |
ALDPMV | Depends on primary element (see ACONE) | Depends on primary element (see ACONE) | Accuracy GRADE 0.075, 0.2, 0.5 | 5800PSI (40 MPa) | -40~256 °F (-40 ~ 125 °C) |
316SS, Tantalum and other exotic materials | CE and ExibIICT6 or Explosion Proof ExdIICT6 | Multi-functional: a single transmitter provides up to three measured values | |
