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Differential Pressure Flowmeters

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 ALDPT-3051 transmitter with the ALDPT-MV 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 Capabilities Hover mouse over icon for application notes

Technology Model/ Series Gas Flow Liquid Flow Steam Flow Line Size Temperature Pressure Viscosity Accuracy Considerations
DP Meters ALDPT
Unlimited flow
Unlimited flow
Unlimited flow
15-3K mm
½"~120"
-196 to 850 °C
-312 to 1562 °F
420 bar
69200 PSI
< 30 CP
± 0.2% and ± 0.5% of Reading
Must include DP transmitter

Must include DP transmitter

Differential Pressure Flow Meters

ALDPT Family
Technology Model Diameters Flow Rate Accuracy Pressure Temperature Materials Approvals Special Features
Unlimited flow

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
ALDP-3051 Water Flow Meter
ALDP-1151

DP Transmitters

ALDPT-3051

ALDPT-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
ALDPMV

DP-MV-Multivariable

ALDPT-MV 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