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Positive Displacement Flow Meters

Positive Displacement Flowmeters, which employ one of the oldest-known flow measurement techniques, are widely used in industry and have one of the largest install bases of any flow meter technology. Positive Displacement Flowmeters feature two precisely machined rotating members inside a measuring chamber of known volume which may be used to accurately determine volumetric flow rate as a function of the rotors' velocity. A more detailed discussion of the principle of operation can be found at:

The advantages that the Positive Displacement Flowmeter provides over other technologies are numerous. These advantages include high accuracy (up to 0.1% of reading), excellent repeatability, wide turndown ratios, high temperature operation, high viscosity operation, no upstream or downstream straight pipe requirement, the ability to be used with mechanical registers which require no electrical power, and readings which are immune to changes in viscosity. This combination of features and advantages makes the PD meter an ideal choice for applications that can be found in many different industries including food & beverage, paint & coatings, oil & gas, and fluid power.

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ALPD Family
Technology Model Diameters Flow rate Viscosity Accuracy Pressures Temperature Materials Approvals
ALBRPD ¼"-16" (8-400mm) 1-33333 LPM (0.26-8800 USGPM) 0~20,000 cP ±0.5% (Std), ±0.2%,0.1% (Opt) 64 bar
(930 PSI)
-30°- 250°C (-22 ~ 480°F) CS (Std),     SS #304 or SS #316 (Opt) CSA/ATEX Approved Class 1 Div 1
ALGPD ¼"-1½" (6-32mm) 0.005 to 1000 LPM (0.001 to 264 USGPM) 5 up to 25,000 cP ±0.25% 690 Barg
(10,000 PSI)
180°C (356°F) SS per DIN 1.4305/AISI 303 or 1.4571/AISI 316 Ti ATEX II 2 G EEx ia IIC T4,
ALOVPD ¼"-8" (8-200mm) 0- 5667 LPM (0-1497 USGPM) 2,000 cP ±0.5% (Std), ±0.2% (Opt) 63 bar
(914 PSI)
200°C (392°F)

CS (Std),     SS #304 or SS #316(Opt)

Helical Rotor
Helical Rotor
ALHPD ¼"- 1½" FNPT
(6 to 40 mm)
0.01 to 400 LPM (0.002 to 105 USGPM) 30 to 1,000,000 cP ±0.25% 400 Bar (5800 PSI) 150°C (302°F) SS DIN 1.4571/1.4435 (SS #316 Ti/316L) ATEX II 2 G EEx ia IIC T4, BVS 03 ATEX E 205
ALMPD ¼” NPTF 1-250 CC/min or 5-1250 CC/min 100 SSU (25 cP) ±1.0% of range 21-147 Mpa (3,000-21,000 psig) -40~80°C (-40~180°F ) SS# 316/ PTFE CSA explosion proof, Class I, Div I grp. C & D


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