Gas Calibration Device

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Electromagnetic Flow Meter

Vortex Flow Meter

Ultrasonic Flow Meter

Turbine Flow Meter

Thermal Mass Flow Meter

Coriolis Mass Flow Meter

Metal Tube Rotameter

Precession Vortex Flowmeter

Ultrasonic Level Meter

Radar Level Meter

Radar-Flowmeter

Oval Gear Flow Meter

Water Quality Analyzer

Throttling Device

Magnetic Level Gauge

Calibratin Device

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Introduction

Cases

Technical Data

Configuration

Introduction

QGCS Series: high-accuracy critical venturi sonic nozzle gas calibration device compliant with ISO 9300:2005 and GB/T 21188-2007, using Critical Flow Venturi Nozzles (CFVN). Equipped with standard-compliant temperature/pressure interfaces, it calibrates/verifies gas turbine, vortex, roots, and industrial diaphragm flowmeters. Ideal for instrument manufacturers (high-volume calibration) and metrological institutions (precision requirements).

Advantages

Multiple power source combinations, high efficiency and energy saving, reduced noise.
Skid-mounted installation, simple and convenient, high level of device uncertainty.
Automatic clamp, linear guide rail, positioning light rod.
One-button operation, high degree of automation.
Simple and durable nozzle structure.
Modular structure, good repeatability, high reliability

Cases

DN15-DN200, 4000 m3

DN15-DN300, 5000 m3

DN15-DN400, 16000 m3

DN15-DN100, 1000 m3

DN15-DN200, 3000 m3

DN15-DN400, 16000 m3

Technical Data

Working Principle

The Critical Flow Venturi Nozzle achieves high-precision gas flow measurement using the "choked flow" principle. As gas accelerates through the converging throat, velocity increases with pressure differential. When the downstream-to-upstream pressure ratio falls below the critical value (typically 0.528), the throat velocity reaches sonic speed, creating "critical flow." At this point, further downstream pressure reduction no longer increases flow rate, which depends solely on upstream stagnation pressure and temperature. This characteristic isolates measurement from downstream disturbances, achieving accuracy up to ±0.2%

Technical Parameters

Model	QGCS-Q1000	QGCS-Q3000	QGCS-Q4000	QGCS-Q5000
Size	DN15-DN100	DN15-DN150	DN15-DN200	DN15-DN300
Max Flow（m3）	1000	3000	4000	5000
Area(LxWxH) m	10 x 4 x 3.5	12 x 6 x3.5	16 x 6 x 3.5	18 x 8 x 3.5
Consumption（KW）	≤32	≤80	≤107	≤132
Uncertainty	≤0 . 33%
Accuracy	Absolute pressure transmitter: 0.075% ~ 0. 1% Temperature sensor: 0.2% Humidity sensor: 2% Critical flow nozzle: 0.2%
Collect Signal	Pulse, 4~20 mA
Wetted Parts	SS304
Flow	Min standard: 0.016 m3/h, normal standard: Qm=2n
Working Environment	Atmospheric pressure: 86 ~ 104KPa Relative humidity: 40% ~90%RH
Design Standard	lSO 9300:2005, GB/T 21188-2007

Drawing (Design according to clients' requirements)


QGCS-Q1000	QGCS-Q3000

QGCS-Q4000	QGCS-Q5000

Configuration

I. Workstation Unit

QGCS-Q1000	DN50/DN100
QGCS-Q3000	DN25/DN50/DN80/DN100/DN150
QGCS-Q4000	DN50/DN80/DN100/DN150/DN200
QGCS-Q5000	DN50/DN100/DN150/DN200/DN300

2. Standard Vessel Unit

It consists of a stagnation vessel, a large-area vacuum vessel, a small-area vacuum vessel, standard flow meters (Critical Flow Venturi Nozzles), vacuum valves, connecting pipelines, and structural component

Pressure Measurement: The pressure data upstream and downstream of the Critical Flow Venturi Nozzles are respectively collected from the stagnation vessel and the large/small vacuum vessels.

Modular Design: The entire standard device module features a skid-mounted design, which facilitates easy installation and future expansion.

Installation Method: The Critical Flow Venturi Nozzles are installed on the stagnation vessel using the upstream large-space method (or "stagnation chamber" method)

3. Power Unit

1. Basic Composition: It consists of a fan power unit, a vacuum pump power unit, a flow-stabilizing tank, valves, connecting pipelines, and structural components.

2. The power source module adopts a stepped-stage design, which offers significant energy-saving effects and contributes to cost reduction and efficiency improvement.

Software

1. Self-diagnostic function	2. Customizable calibration data format
3. Adaptive power system	5. Selectable data forms / Optional data templates
6. On-site verification of nozzle coefficient / Field calibration of nozzle coefficient	4. Arbitrary matching of flow points / Flexible flow point matching