Home>Product Introduction> Type LL Roots Flow Meter

Type LL Roots Flow Meter is a certain kind of volumetric flow measuring meter, used for fluid volumetric flow in enclosed pipeline. It is of on-site display and remote-transfer interface, which can be adapted with Optical-Electrical Pulse Convertor and Flow Totalizer for remote measurement, display and control.

1) High measuring accuracy; tolerance ¡À0.2% to ¡À0.5% in general, ¡À0.1% for special; Flow Meter performance is usually not affected by flowing status, or Reynolds Number;
2) Applicable to flow measuring of liquids with high viscosity;
3) Wide Range-ability; typical range ratio 5:1 to 10:1;
4) Digital Wheel Counter for flow accumulation display; no external power supply is needed; easily-operated; Counter dual displays for flow accumulation, one of them is Zero- returnable for user¡¯s discontinuing measuring convenience;
5) Non-contacting, no friction wearing among measuring parts; long working lifespan;

6) Dual Rotors are adopted for Roots-Flow meters with big diameter in order to reduce running noise and vibration;

  • LL Type: suitable for flow measuring of pure crude oil, heavy oil and liquids with high viscosity;
  • LL-D Sand-Proof Type: suitable for flow measuring of crude oil, heavy oil and liquids with sand content;
  • LL-F Stainless Steel Type; Flow Meter wetted parts are made of stainless steel with good corrosion-proof performance; suitable for flow measuring of corrosive liquids, especially suitable in chemical industry;
  • LL-H Light Oil Type (low viscosity): suitable for flow measuring of light oil, diesel and liquids with low viscosity;

    Flow Meter is attached with Photo-Electrical Output Shaft, by Output Shaft connecting with Type LPJ-12D (or Type LPJ-12D/FI) Optical-Electrical Pulse Convertor; it can transfer pulse signal or 4 ¨C 20mA current signal remotely.

Product Standard:Q/TDSM 01-2014
Verification Regulation: JJG 667-2010 Verification Regulation of Liquid Positive Displacement Flowmeter

Main Technical Specifications

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Type Selection

1. Settle Nominal Diameter:
    According to actual working flow rate Q (normal flow rate) and principle: 30%Qmax < Q <80%Qmax, to figure out Qmax; refer to Table ¡°Main     Technical Specifications¡± to settle Nominal Diameter:
2. Settle Fundamental Tolerance (Accuracy Class):
    As per practical needs, to select ¡À0.2% or ¡À0.5% or others;
3. Settle Nominal Pressure:
    As per actual working pressure and principle: actual working pressure < Nominal Pressure; to settle Flow Meter Nominal Pressure;
4. With settled Nominal diameter, Fundamental Tolerance (Accuracy Class) and Nominal Pressure, and then with reference to ¡°Type Code for     Selection¡±, to finalize the Flow Meter Type;

Type Selection Code

Dimensions & Installation Reference

Complementary Product Briefing