CMASS008PU Helium Coriolis Mass Flowmeter

This is the most critical advantage. Traditional flow meters such as vortex or turbine types measure volumetric flow, but gas volume is highly influenced by temperature and pressure . To obtain true mass flow, additional temperature and pressure sensors are required for complex calculations, which not only increases costs but also introduces more potential error sources.

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Description

CMASS008PU Helium Coriolis mass flowmeter

1.Direct mass flow measurement without temperature or pressure compensation
This is the most critical advantage. Traditional flow meters such as vortex or turbine types measure volumetric flow, but gas volume is highly influenced by temperature and pressure . To obtain true mass flow, additional temperature and pressure sensors are required for complex calculations, which not only increases costs but also introduces more potential error sources.

2.Exceptionally high accuracy and repeatability
Accuracy typically reaches ±0.1% to ±0.5% (or even higher), while repeatability is better than ±0.05%. This is essential for cost-intensive helium measurement and demanding process control applications.

3.Wide Turndown Ratio (Rangeability)
Wide rangeability. This means that the same flow meter can accurately measure both high and low flow rates, making it highly adaptable to different process conditions.

4.Insensitivity to Fluid Properties
The measurement principle is based on vibration and is independent of gas conductivity, dielectric constant, thermal conductivity, or other properties. As long as the medium can flow through the measuring tube, it can be accurately measured. This ensures excellent compatibility with gases such as helium, hydrogen (low density), and others.

Model	A	B	F	C	D	d	M
CMASS003	210	325	95	156.50	54	Φ65	NPT 1/4" Female thread
CMASS004	210	325	95	156.50	54	Φ65	NPT 1/4" Female thread
CMASS008	210	325	95	156.50	54	Φ65	13/16-16UNF Female thread
CMASS015	210	348	95	180	54	Φ65	G3/4" Female thread

Advantages of U-Shaped Tube

Relatively Low Pressure Loss: Compared to more compact tube designs like the Ω-type, the U-shaped tube offers a smoother flow path, resulting in lower pressure loss for light gases such as helium.
Easier to Empty: The U-shaped structure minimizes the accumulation of liquids or impurities, helping to maintain the purity of helium measurements.
High Stability: The robust mechanical design ensures strong resistance to interference and reliable performance.

Model and diameter

Model	Nominal diameter		Medium temp.	Max.W.P	Max. flow-rate
Model	inch	mm	Medium temp.	Max.W.P	kg/min	Lb/min
CMASS003	1/8"	DN03	-50℃～+150℃	≤10MPa	3	6.61
CMASS004	1/6"	DN04	-50℃～+150℃	≤10MPa	5	11
CMASS008	1/4"	DN08	-50℃～+150℃	≤10MPa	20	44
CMASS015	1/2"	DN15	-50℃～+150℃	≤10MPa	60	132

Characteristic	Description
Certification: Transmitter & Sensor Assembly	CCS Certification, CPA, Explosion proof certificate(ex)
Power Supply	220VAC/24VDC Self-adaption
Output signal	Hart,4 to 20mA current loop active,Modbus RTU/RS-485, Pulse active
Display;Operate	3-line backlight; Touch key control
Protection grade	IP66,IP67
Housing material	304 stainless steel, ZL401 (Transmitter)
Electrical connection	1/2 NPT,M20*1.5
Measuring Tube Material;Wetted Parts Surface Finish	316L (default), titanium/Ha C alloy/tantalum (optional); polishable.
Process connection	Thread,Flange,Sanitary high-speed interface
Accuracy	±0.1%,±0.15%, ±0.2%, ±0.5 %, ±1.0%
Transmitter software	CLS100 (default), optional CLS200, CLS300
>Operating language display	Chinese, English, Russian
>>Other certifications	Explosion proof certificate, SIL, CCS, 3-A, EAC

Key Considerations

Extremely Low Gas Density: Helium has the second lowest density among all gases (after hydrogen). Low-density fluids can reduce the sensitivity of the flow meter, making it essential to select a model specifically optimized and calibrated for low-density media. The DN25 caliber you selected is a common choice for measuring gas flow.
Pressure and Range: Ensure that your operating pressure and required flow range (within target accuracy) fall within the flow meter's rated specifications. Measuring low-density gases at low pressures presents greater challenges.

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