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HQRS Gas Mass Flow Meter
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HQRS Gas Mass Flow Meter
The HQRS flow meter measures based on the widely accepted thermal mass flow principle of thermal gas mass flow meters, directly measuring thermal mass flow and displaying standard volumetric flow without requiring temperature and pressure compensation.
The HQRS is specifically designed for harsh environments, featuring an IP67 protection rating for all-weather applications. All parts in contact with the gas are made of 316L stainless steel, making it corrosion-resistant and capable of measuring dirty gases with high impurity content. It is explosion-proof certified and can measure explosive gases such as natural gas, hydrogen, and biogas, as well as corrosive gases. It is suitable for fuel and gas supply in furnaces, boilers, and industrial melting furnaces, and for gases in coolers. Basically, any mixed gas can be measured as long as the mixing ratio and composition are known and relatively stable. The HQRS thermal gas mass flow meter has powerful communication capabilities, providing communication interfaces for factory automation systems in modern factories. Hielscher's flow meters support not only traditional 4-20mA and pulse outputs but also various fieldbus interfaces such as HART, MODBUS, and M-BUS. The modular design makes it easy to adapt to other fieldbuses. The HQRS thermal gas mass flow meter also supports Bluetooth communication. The VA450 display has a diameter of 95mm and a thickness of 114mm, and can be adjusted (rotated or inverted) according to the site environment; it is suitable for pipe diameters DN15-DN300, and larger diameters can be customized. HQRS Thermal Gas Mass Flow Meter
Thermal Gas Mass Flow Meter Product Features:
The HQRS thermal gas mass flow meter directly measures mass flow and standard volumetric flow, requiring no pressure compensation. It is suitable for a wide range of pipe sizes, with insertion type for large diameters and inline type for small diameters. It has no moving parts, and all parts in contact with the medium are made of 316L stainless steel. A robust and durable housing protects the device, making it suitable for harsh outdoor applications. Sensor settings can be changed on-site using a wireless Bluetooth interface. The screen displays flow rate, consumption, medium temperature, and diagnostic results. It features two analog outputs [4-20 mA] and one pulse output.
Optional: Fieldbus interface: HART, MODBUS, M-BUS
ATEX explosion-proof certification: II 2 G Ex d IIC T4
Bidirectional measurement
Flow control
Technical parameters of thermal gas mass flow meters:
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HQRS Gas Mass Flow Meters |
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|---|---|
| Measurement range |
0.4...92.7 sm/s (Standard range calibration) 0.8...185 sm/s (Extended range calibration) (Please refer to the volumetric flow rate range table for flow measurement ranges under different pipe diameters) *sm/s: Standard flow velocity |
| Accuracy |
±(1.5% Reading + 0.3% of full scale) |
| Accuracy Conditions | Ambient/Process temperature: 23 °C ±3°C Ambient/Process humidity: < 90%, non-condensing Process pressure: 0.6 MPa |
| Repeatability |
0.25% |
| t95 Reaction time | <5s |
| Sampling rate | The display and output are refreshed every 200 milliseconds. |
| Pipe diameter |
Insertion type: DN25 ... DN1500 In-line type: DN15 ... DN80 |
| Process connection |
Insertion type: ½” G-type thread (ISO 228-1) Pipeline type: R-type thread (ISO 7-1), Flange EN 1092-1, ANSI 16.5, JIS B2220 |
| Measurement medium | For any gas with known and constant composition and mixing ratio, please refer to the ordering information and media temperature in the standard gas list. |
| Operating temperature |
-40 to +150 °C (medium temperature, immersion type) -40 to +100 °C (medium temperature, pipe-mounted type) -40 to +65 °C (ambient temperature) |
| Operating pressure |
1.6 MPa (Insert type) 4.0 MPa (Pipeline type) |
| Analog output |
2 x 4...20 mA, maximum load 500 ohms, active or passive output selectable, measurement channels selectable, output range programmable. |
| Pulse/Alarm Output |
One pulse is generated for every 1, 10, or 100 units consumed; the alarm is programmable. |
| Power |
16-30 VDC, 7 W |
| Out case |
NEMA 4X, IP 67 |
| Sensor Material | 316 SSL |
| Certifications |
CE, RoHS ATEX : II 2 G Ex d IIC T4(Optional) |
| Fieldbus (optional) |
MODBUS HART M-BUS |
| Configure interface | Hill's Service Kit Bluetooth |
HQRS Thermal Gas Mass Flow Meter Applications:
Flow and distribution of compressed air
Flow and distribution of process gases, such as carbon dioxide, argon, nitrogen, and oxygen
Explosive gases, such as natural gas, hydrogen, and biogas
Corrosive gases, such as biogas
Fuel and gas supply in furnaces, boilers, and industrial kilns
Gases in coolers
Gas injection dosage control
Schematic diagram of the HQRS thermal gas mass flow meter structure
Certifications
