The LL series waist wheel flowmeter is a volumetric flow measurement instrument that can be used to continuously measure the volumetric flow rate of liquid flowing through pipelines. Its working principle is that when the measured liquid flows through the measuring chamber, a pressure difference is formed at the inlet and outlet of the flowmeter, and the waist wheel rotates under the push of this pressure difference (see Figure a, b, c, d). Simultaneously, by fixing a pair of driving gears on the waist wheel shaft, the two waist wheels are kept in continuous rotation. The number of rotations, through gear transmission and sealed reduction mechanism, drives the counter and pointer to rotate, thereby displaying the volume of flow through the flowmeter.

The Ll type waist wheel flowmeter has a novel design and a beautiful appearance. It has the characteristics of light weight, high precision, and easy installation and use. It is one of the typical products of volumetric flow meters. Widely used in the measurement of gasoline, kerosene, light diesel and other oil products in departments such as petrochemicals, electricity, metallurgy, transportation, national defense, and commerce.

Main Technical Performance

Working pressure (MPa): 0.6, 1.0, 1.6, 2.5, 4.0

Working temperature (℃):- 10℃～60℃

Medium viscosity (mPa. s): 0.6-150

Accuracy level: 0.5 0.2

LL type waist wheel flowmeter is a volumetric flow measurement instrument used to measure the volumetric flow rate of fluids in closed pipes.
On site display of accumulated flow rate, with remote transmission output interface, matched with corresponding photoelectric pulse converter and flow integrator, can be used for remote measurement, display and control.
High precision, good repeatability, large range, and low requirements for the straight pipe sections before and after the flowmeter.
Suitable for fluids with higher viscosity, changes in fluid viscosity have little impact on the displayed values.
Suitable for non corrosive fluids such as crude oil and petroleum products
(Diesel, lubricating oil, etc.).

Working principle

When the measured liquid flows through the measuring chamber, a differential pressure is formed at the inlet end of the flowmeter. Under this pressure, the waist wheel rotates, and at the same time, the two waist wheels exchange driving rotation through a pair of driving gears fixed on the waist wheel shaft. Since the volume of the measuring chamber is a fixed value, the flow rate of the measured liquid is proportional to the number of waist wheel revolutions, and is transmitted to the counter through a variable speed mechanism of the transmission ratio. The cumulative value of the counter is the volume flow rate of the measured liquid during a certain period of time.

nominal orifice DN(mm)	big internet traffic m^3/h	Basic error limit (%)		medium temperature °c	Remote transmission output Shaft speed m^3/r	Nominal pressure MPa	High pressure loss MPa	Viscosity range mPa · s
		Range degree 5：1	Range degree 10：1
15	2.5	±0.2	±0.5	0~120	0.001	6.3	＜0.04	3~5000
25	6
40	16
50	25				0.01	1.6 2.5 4.0 6.3
80	60
100	100
150	250				0.1
200	400
250	600
300	1000

Note: If the temperature is above 120 ℃, special orders are required

Attributes
[Origin]	Jiangsu
[nominal diameter]	15 25 40 50
[Customized Processing]	correct
[Brand]	DETAIR
[Model]	LL
[Work pressure]	1.6
[Working temperature]	160
[Is it a cross-border export exclusive source of goods]	deny
[Whether to import]	deny
[Measurement Range]	1
[Type]	Positive displacement flowmeter
[Accuracy level]	0.5
[Item Number]	TB-40419435578
[Applicable medium]	liquid