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Ball Type Flow Meter: Sourcing Cylinder Gas Shielding Visual Dial Scales
Quick Answer: A ball type flow meter for cylinder gas shielding measures argon, CO2, helium, nitrogen, or mixed shielding gas in L/min. Silver Automation Instruments supplies these meters with visual dial scales for direct reading without power or wiring. Send us your gas type, flow range in L/min, connection size, and working pressure for a quote.
This meter is also called a variable area flow meter or rotameter. The body is a tapered glass tube. A ball float moves up as gas flow increases. The operator reads the flow at the ball center from a printed visual dial scale. There is no battery, no signal output, and no loop wiring.
How a Ball Type Flow Meter Works for Cylinder Gas Shielding
A gas cylinder regulator lets shielding gas flow into the ball type flow meter. The gas enters the bottom port and lifts the ball. The ball position corresponds to a flow rate on the visual dial scale. For cylinder gas shielding this gives a direct reading in L/min. Welders adjust the needle valve on the meter or the regulator to set the gas flow.
Because the gas cylinder pressure drops during use, a compact visual meter is easier to manage than a digital thermal mass flow meter. Most cylinder gas shielding applications do not need a 4-20 mA HART output. They need a reliable mechanical reading at the point of use.
Common Gases and Calibration for Visual Dial Scales
The most common gases are argon, CO2, helium, nitrogen, and an argon plus CO2 mix. Each gas has a different density. A ball type flow meter is calibrated for one gas or printed with dual scales. A scale for argon is not accurate for CO2. Most engineers skip this part. We have seen this on customer sites many times. They order a gas flow meter and later find the scale was calibrated for air. For cylinder gas shielding, order the scale gas at the start.
A typical DN15 model for TIG welding has an argon scale from 1 to 10 L/min or 1 to 15 L/min. A MIG welding CO2 model often uses 1 to 25 L/min. Helium shielding for laser or aluminium work may need a scale from 2 to 20 L/min. Silver Automation Instruments can print dual scales for argon and CO2 on one tube if requested.
Visual Dial Scales and Reading Accuracy
The visual dial scale is printed on the glass tube or a panel behind the tube. The scale gives a direct reading. No conversion chart is needed in the field. Accuracy is typically plus or minus 4 percent of full scale. For a 10 L/min full scale meter that is plus or minus 0.4 L/min.
The dial scale is not a digital reading. Here is the thing. Ball type flow meters are for flow indication and adjustment. They are not for custody transfer or fiscal measurement. In practice, the operator sets the flow at the start of a weld and checks the dial scale again after a cylinder change.
Key Specifications for Sourcing Cylinder Gas Shielding Flow Meters
Standard
For argon cylinder gas shielding at 1 to 10 L/min, order a DN15 ball type flow meter with 316L ball and argon visual dial scale. For CO2 at 1 to 25 L/min, use the same DN15 body with a CO2 visual dial scale. If the cylinder regulator outlet is a 1/4 inch flare or CGA fitting, tell us the exact fitting type in your inquiry.
Sourcing from Silver Automation Instruments
Silver Automation Instruments keeps stock in Nanjing for DN10, DN15, and DN25 ball type flow meters. Standard orders ship in 3 to 5 working days. We send small parcels by DHL or FedEx. Large orders can go by sea freight. We have supplied gas flow meters to TIG welding shops in Vietnam, a steel fabricator in Australia, a welding gas distributor in Qatar, and a food packaging line in Chile. The food packaging customer used nitrogen as a cylinder gas shielding and purging medium.
You can see the full range on flow-meter.com.au. For a quotation send us the gas type, flow range in L/min, connection size and type, and working pressure in bar. Contact Silver Automation Instruments at Tel +86-135-1213-1526 or WhatsApp 86-135-12131526 or WeChat +86 13512131526.
FAQ: Ball Type Flow Meter for Cylinder Gas Shielding
Q: What gases can a ball type flow meter measure for cylinder gas shielding? A: Argon, CO2, helium, nitrogen, and mixed gases like argon plus CO2. Choose the scale gas when ordering. A meter calibrated for argon will not read true for CO2.
Q: How do I read the flow from the visual dial scale? A: Read the center of the ball float. The printed dial scale gives a direct reading in L/min. On some models the top edge of the ball is used. We mark the reading edge in the manual.
Q: Can I use one ball type flow meter for different shielding gases? A: Yes but with a correction factor. It is better to order a dedicated scale for each gas. Silver Automation Instruments can print dual scales for argon and CO2 on one tube.
Q: What connection sizes are common for cylinder gas shielding? A: DN10 and DN15 are most common. Inlet and outlet can be 1/4 inch, 3/8 inch, or 6 mm compression fittings. Cylinder regulators often use a 1/4 inch BSP or CGA fitting. Give us your regulator outlet type when you ask for a quote.
Q: How do I order replacement ball type flow meters from Silver Automation Instruments? A: Send us the gas type, flow range in L/min, connection size, fitting type, and quantity. Contact Tel +86-135-1213-1526 or WhatsApp 86-135-12131526 or WeChat +86 13512131526. We will send a quotation within 24 hours.
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