Gas Roots Flow Meter

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Natural gas flow meter

Gas turbine flow meter

Introduction

Application

Technical Data

Installation

Introduction

QTLL intelligent gas roots flow meter is a flow meter that integrates flow, pressure and temperature detection functions which could perform pressure, temperature and compression factor correction. It has a variety of structural forms and functional configurations to meet the different requirements of users. QTLL gas roots flow meter is widely used in the fields of urban gas and industrial gas flow measurement and detection, and could meet the user's requirements for high-precision, high-reliability measurement or detection.

Advantages

Gas roots flow meter is with high accuracy and good repeatability, it adopt high-precision imported dust-proof stainless steel special bearings which could ensure long service life. The intelligent integrated design can dynamically detect the temperature and pressure, and perform automatic compensation and compression factor correction. With advanced dual-power micro-power consumption technology, gas roots flow meter support battery working life more than 3years.
Compared with precession vortex flow meter, gas turbine flow meter is with low pressure loss, low initiating flow and wider range ratio.

Application

Gas roots flow meter is widely used in the flow measurement of natural gas, coal-to-gas, inert gas, air and other gases. It is an ideal flow measurement device for domestic and foreign urban gas, oilfield chemical, scientific research and other departments.

Natural Gas

Petroleum

Chemical

Electric Power

Industrial Boilers

Gas Metering

Technical Data

Gas Roots Flow Meter Parameters

Size	DN25-DN200mm
Accuracy	1.5% (Standard) Qt—Qmax ±1.5%，Qmin—Qt ±3.0%，Qt=0.05Qmax 1.0% (Optional) Qt—Qmax ±1.5%，Qmin—Qt ±3.0%，Qt=0.05Qmax
Repeatability	Better than 0.2%
Working condition	Ambient: -30℃～+60℃ Medium temperature:-20℃～+80℃ Relative humidity: 5%-9%
Power supply	External power: ＋12～24VDC Internal power:3.6V Battery
Power consumption	<2W (external power) ≤1mW (internal power)
Output	Pulse 4-20mA (external power)
Communication	RS485
Pressure rating	1.6MPa

Gas Roots Flow Meter Dimension

Model	Flow Spec	L	H1	H	Remark
QTLL-25	G16	273	128	340	Flange dimension refer to PN1.6MPa GB flange. Other flange standards can specially make. While installation, please consider the sealing gasket thickness about 2-3mm.
QTLL-40	G25	354	190	375
QTLL-50	G25	354	190	375
	G40	425	190	375
	G65	425	190	375
QTLL-80	G65	412	190	375
	G100	412	190	375
	G160	475	245	400
QTLL-100	G160	575	245	400
QTLL-100	G250	665	245	400
QTLL-150	G400	683	460	505
QTLL-150	G650	802	460	505

Gas Roots Flow Meter Flow Range

Model	Flow Spec	Size (mm)	Flow Range （m³/h）	Start up flow （m³/h）	Max Pressure loss （KPa）
QTLL-25	G16	DN25	1-25	0.05	0.08
QTLL-40	G25	DN40	1-40	0.05	0.08
QTLL-50	G25	DN50	1-40	0.1	0.08
	G40		2-65	0.1	0.1
	G65		2-100	0.12	0.15
QTLL-80	G65	DN80	2-100	0.12	0.15
	G100		2.5-160	0.1	0.15
	G160		3-250	0.1	0.18
QTLL-100	G160	DN100	3-250	0.1	0.2
QTLL-100	G250	DN100	4-500	0.65	0.35
QTLL-150	G400	DN150	8-650	0.76	0.46
QTLL-150	G650	DN150	15-1000	0.85	0.5
QTLL-200	G1600	DN200	32-1600	0.95	0.6

Gas Roots Flow Meter Model Selection

QTLL	Parameters	×××	×	×	×	×	×	×
Size (mm)	DN25-DN200mm
Accuracy	1.5% (standard)		1
	1.0%		2
Nominal Pressure	1.0MPa			1
	1.6MPa			2
	Others			3
Body Material	Aluminum Alloy				A
	Stainless Steel				S
Output/ Communication	Pulse					1
	Pulse+4~20mA					3
	Pulse+4~20mA+RS485					4
Power Supply	Battery Powered						1
	Battery Powered + External Power DC24V						2
Ex-proof	With							1
	Without							2
Installation	Horizontal							H
	Vertical							V

Installation

Installation Requirement for Gas Roots Flow Meter
Before the flow meter is installed (especially the new pipeline or the pipeline after repair), the pipeline must be purged to remove impurities such as welding slag and rust.

(1)Vertical installation
When installing vertically, the gas inlet should be at the top, and the airflow will flow from top to bottom, that is, top in and bottom out. The company recommends users to use vertical installation as much as possible. The self-cleaning ability of the rotor to sundries;

(2)Horizontal installation
When installing horizontally, the axis of the inlet and outlet ends of the flow meter should not be lower than the axis of the pipeline to prevent impurities in the gas from staying in the flow meter and affecting normal operation. At the same time, the flow meter flange should be directly connected to the filter flange;

(3) Regardless of vertical installation or horizontal installation, the rotor shaft in the flow meter must be in a horizontal position.