LLQ Series Gas Roots Flow Meter Round Standard Display

LLQ Series Gas Roots Flow Meter Mechanical Monitor

LLQ Series Gas Roots Flow Meter IC Card Control

LLQ Series Gas Roots Flow Meter Square Standard Display

LLQ Series Gas Roots Flow Meter – Volumetric

LLQ series Gas Roots Flow Meter integrates flow, temperature, and pressure detection functions, and can automatically compensate for temperature and pressure. Also called lumpar wheel flow meter, roots meter.

1. High accuracy, up to ±1.5%R. The internal rotor is precision machined and balanced tested for contactless rotation. Ensure that the accuracy of the flow meter remains unchanged.
2. There is no need for straight pipe sections before and after the flow meter, and it can be installed in narrow environments.
3. The initial flow rate is small, and the initial flow rate of different specifications of flow meters is 0.04m³/h~1.20m³/h.
4. Wide range ratio, suitable for measuring gas flow with large changes.
5. Measuring accuracy is not affected by changes in pressure and flow, with stable performance and long life.
6. Equipped with RS-485 communication interface and IC card dedicated signal concentrator. And can form a remote data collection machine monitoring system through GPRS/CDMA, internet and network. Facilitates centralized collection and real-time management of data.
7. Display flow value locally and have multiple signal output functions.
8. It has real-time data storage function, and the explosion-proof mark is ExibllCT4.

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LLQ Series Gas Roots Flow Meter Description

LLQ series Gas Roots Flow Meter is a new generation gas flow meter that integrates flow, temperature and pressure detection functions and can automatically compensate for temperature and pressure.

Sino-Inst Gas Roots Flow Meter adopts advanced microcontroller technology and micro-power consumption high technology. It can perform in-press settings and automatic temperature tracking and compensation calculations for the medium being measured. Directly displays the total volume of P0=101.325Kpa and T0-293.15K under standard conditions. Facilitate the unification of standards between trading parties.

The LLQ series intelligent gas Roots (waist wheel) flow meter is suitable for measuring non-corrosive gases such as natural gas, city gas, propane, nitrogen, and industrial inert gases.

LLQ Series Gas Roots Flow Meter Data Sheet

Measuring medium	Gas in closed pipe
Instrument diameter and connection method	DN20~DN25~DN250, flange connection;
Accuracy	±1.5%R
Material	Meter body: cast aluminum or cast iron; rotor: high-quality aluminum alloy; converter: cast aluminum;
Conditions of Use	Medium temperature: -10~60℃; Ambient temperature: -30~60℃; Relative humidity: 5%~90%; Atmospheric pressure: 86~106Kpa;
Working power supply	A. External power supply: 24VDC ± 15%, ripple: ≤ ±5%. Suitable for 4-20mA output, pulse output, RS485 communication, etc. B. Internal power supply: 1 3.6VDC lithium battery. An undervoltage indication occurs when the voltage is lower than 2.0.
Machine power consumption	A. External power supply: <1W B. Internal power supply: average power consumption ≤1W, can be used continuously for more than 5 years.
Output signal function	Pulse output; 4-20mA current signal output; IC card control signal
Communication output function	RS485 communication
show	Display function: It can display the cumulative total, instantaneous flow, temperature, pressure and battery power at the same time.
Real-time recording function	Start and stop recording, daily recording, fixed time interval recording.
Signal line interface	Internal thread M20*1.5 or other
Explosion-proof level	ExiaⅡCT4
Protection level	IP65

Flow Range

Nominal Diameter	Model No.	Starting Flow Rater m³/h	Maximum Flow Rate m³/h	Pressure Loss Pa	Pressure Rating MPa	Accuracy %	Range Ratio	Materials
DN25 mm	LLQ-20	0.06	20	100	1.0	1.5/1.0	20:01	Aluminium Alloy
DN40 mm	LLQ-30	0.06	30	100	1.0	1.5/1.0	20:01
DN40 mm	LLQ-40	0.06	40	140	1.0	1.5/1.0	20:01
DN50 mm	LLQ-60	0.07	60	100	1.0	1.5/1.0	60:01:00
DN50 mm	LLQ-85	0.07	85	140	1.0	1.5/1.0	70:01:00
DN80 mm	LLQ-100	0.07	100	110	1.0	1.5/1.0	70:01:00
	LLQ-140	0.07	140	150	1.0	1.5/1.0	100:01:00
	LLQ-200	0.1	200	180	1.0	1.5/1.0	100:01:00
DN100 mm	LLQ-300	0.15	300	180	1.0	1.5/1.0	110:01:00
DN100 mm	LLQ-450	0.15	450	130	1.0	1.5/1.0	110:01:00
DN150 mm	LLQ-650	0.6	650	200	1.0	1.5/1.0	80:01:00
DN150 mm	LLQ-1000	1	1000	350	1.0	1.5/1.0	80:01:00
DN200 mm	LLQ-1600	1.2	1600	450	1.0	1.5/1.0	80:01:00
DN250 mm	LL0-3000	2	3000	650	1.0	1.5/1.0	60:01:00

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LLQ series Gas Roots Flow Meters produced and supplied by Sino-Inst have a wide range of applications and can be used to meter various non-corrosive gases, such as propane, nitrogen and industrial inert gases.

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Gas Roots Flow Meter Applications

In the field of industrial gas measurement, Roots gas flow meters have become a reliable and common choice. This flowmeter adopts the volumetric measurement principle, which has the advantages of high precision, low interference, and good stability.

Measurable gases:
Suitable for measuring non-corrosive gases such as natural gas, city gas, propane, nitrogen, and industrial inert gases.

Main applications:
1. Widely used in flow measurement of natural gas, coal gas, inert gas, air and other gases. It is an ideal flow measurement device for urban gas, oilfield chemical industry, scientific research and other departments at home and abroad.
2. It is widely used in the trade measurement of urban gas. It is especially suitable for the trade measurement of large gas consumers such as government agencies, schools, enterprises and institutions, hotels, and restaurants. It can also be used in various industrial raw gas main metering, gas distribution stations, main gas supply stations and other occasions.
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LLQ Series Gas Roots Flow Meter - Volumetric Detail Display

More Detail

Roots Meter Working Principle

Roots flowmeter (gas waist wheel flowmeter) is mainly composed of a housing, a conjugate rotor and a counting device.

A pair of conjugate rotors installed in the measuring chamber maintains the correct relative position of the rotors through precision-machined adjustment gears under the action of the outlet pressure difference of the circulating gas. The optimal working clearance between the rotors, the rotor and the shell, and the rotor and the wall panel is maintained to achieve continuous non-contact sealing.

Each time the rotor rotates once, the gas output is four times the effective volume of the metering chamber. The rotation speed of the rotor passes through the magnetic seal coupling device and reduction mechanism. Passed to the totalizing indication counter, thereby displaying the cumulative volume of the output gas.

What is a Roots gas meter?

Roots gas meter is also called gas waist wheel gas meter. There is a metering chamber inside the casing, and there are one or two pairs of waist wheels in the metering chamber that can rotate tangentially. A pair of drive gears are installed coaxially with the two waist wheels outside the flowmeter housing. They mesh with each other so that the two waist wheels can link with each other to obtain a metering gas meter.

Roots gas meters are mainly used as high-precision measuring instruments for continuous or intermittent measurement of gas flow in pipelines. It has the characteristics of high precision, good reliability, light weight, long life, low operating noise, and easy installation and use.

What is the best flowmeter for gas?

There are many types of flow meters that can measure gases. There is no best one, only the gas flow meter that is most suitable for your measurement conditions.

The following are some gas flow meters commonly used for industrial gas measurement:

Gas turbine flow meter;
Vortex flowmeter;
Precession vortex flowmeter;
Positive displacement flow meter;
Differential pressure flow meter;
Thermal mass flow meter;

After understanding the parameters and performance characteristics of various gas flow meters, you need to select the most suitable gas flow meter based on the actual measurement conditions. If you need technical support for selecting a gas flow meter, please feel free to contact Sino-Inst’s sales engineers!