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K40 Flow Meter Specifications: High-Volume Industrial In-Line Variable Area Rotameters for Gas Processing
Quick Answer: The K40 variable area rotameter covers gas flows from about 0.4 Nm3/h on DN15 lines to 4000 Nm3/h on DN150 lines, depending on gas density, pressure, and temperature. It suits nitrogen, natural gas, air, biogas, hydrogen, and flare gas service. For a firm quote, send your gas type, flow range in Nm3/h or kg/h, pressure in bar, temperature in °C, pipe size DN, flange standard, and hazardous area classification.
Silver Instruments supplies the K40 as a direct in-line metal tube rotameter for high-volume gas processing. It is not a bypass meter. The float moves in a vertical flow path and gives a local reading plus an electronic signal. Because gas density changes with pressure and temperature, every K40 is calibrated for one gas or one defined gas mixture.
Most engineers skip this part. They focus on line size but forget gas density. A DN40 K40 on air at 1 bar gauge and 20 °C may read 10 to 100 Nm3/h. The same DN40 meter on natural gas at 5 bar may handle a much larger mass flow before the float reaches the top stop.
What Does the K40 Flow Meter Handle in Gas Processing?
We see the K40 used in nitrogen blanketing, fuel gas skids, flare line monitoring, gas mixing panels, compressor purge lines, and regeneration gas lines. The meter installs directly in the main pipe and does not need long straight upstream and downstream runs. In practice, that saves space on crowded gas processing skids.
A gas processing site in Oman ordered four K40 DN100 meters for fuel gas to a regeneration gas heater. The flow range was 300 to 3000 Nm3/h at 4 bar. They needed PN40 flanges and Ex d IIC T6 for Zone 1. The full order shipped in twelve days.
What Are the Core K40 Flow Meter Specifications?
The standard accuracy is 1.6 percent of full scale. An optional 1.0 percent full scale calibration is available for air and nitrogen. Turndown ratio is 10 to 1. The wetted parts are normally 316L stainless steel. The float can be 316L, PTFE, or Hastelloy C. The meter housing is 304 stainless steel.
Line sizes start at DN15 and go to DN150. Process connections are DIN PN16, DIN PN40, ANSI 150, or ANSI 300 flanges. Threaded and tri-clamp connections are available for small lines. Gas flow capacity depends on gas density, so the same meter body covers different ranges for different gases.
What Pressure and Temperature Ratings Apply?
The K40 handles gas temperatures from -40 °C to 200 °C as standard. A high temperature version extends to 300 °C. The standard pressure rating is PN40 or Class 300. Always check the permanent pressure loss because a variable area meter adds a small pressure drop to the line.
For explosive atmospheres, the K40 can be supplied with Ex d IIC T6 or Ex ia IIC T6 certification. ATEX Zone 1 and IECEx versions are common for natural gas, biogas, and hydrogen service. Specify the zone, gas group, and temperature class when you request a quote.
What Output Signals Does the K40 Support?
The electronic version provides a 4 to 20 mA HART output. Some customers add a pulse output or RS485 Modbus. The local mechanical pointer still works if loop p
Power supply is normally 24 V DC. The two-wire loop-powered transmitter keeps field wiring simple. For panel integration, Silver Instruments can supply a K40 with a backlit LCD indicator and two alarm outputs.
How Is the K40 Calibrated for Gas Density?
A variable area flow meter is calibrated for a specific gas at a specific pressure and temperature. If the operating conditions change, the reading shifts. Silver Instruments calibrates the K40 against your gas type and flow range before shipment.
For air and nitrogen, we use standard reference data. For biogas and mixed gas, we ask for gas composition percent by volume. Do not oversize the meter. A K40 that is too large pushes the float near the bottom and reduces accuracy at low flow. If the normal flow is below 20 percent of full scale, select a smaller meter size and use reducers.
Real Customer Examples on Gas Processing
Last year a customer in Vietnam ordered twelve K40 meters for nitrogen blanketing on a gas processing line. They used DN40 PN16 flanges, a flow range of 20 to 200 Nm3/h, and Ex d IIC T6 for Zone 1. Another customer in Malaysia put six DN50 K40 rotameters on a gas mixing skid with 4 to 20 mA HART output. Both projects shipped from stock within ten days.
We have seen this on customer sites many times. A K40 installed on a dirty biogas line runs for years with almost no drift if the float and guide are cleaned once a year. Because the meter has only one moving part, maintenance is usually limited to inspection and cleaning.
FAQ: Five K40 Rotameter Questions Engineers Ask
What flow range can the K40 handle on gas service? From about 0.4 Nm3/h on a DN15 to 4000 Nm3/h on a DN150. The exact range depends on gas density, pressure, and temperature. Send your gas type and operating conditions for a confirmed range.
What is the accuracy of the K40 variable area flow meter? Standard accuracy is 1.6 percent of full scale. Optional 1.0 percent of full scale is available for air and nitrogen. This is a full scale specification. Error is larger near the bottom of the range.
Can the K40 be used in hazardous areas? Yes. Ex d IIC T6 and Ex ia IIC T6 versions are available for ATEX Zone 1 and IECEx gas atmospheres. Specify the zone, gas group, and temperature class when requesting a quote.
What output signals does the K40 support? The electronic version provides 4 to 20 mA HART. Optional outputs include pulse and RS485 Modbus. A local mechanical pointer is standard on both mechanical and electronic versions.
How do I request a K40 price and lead time? Send your gas type, flow range in Nm3/h or kg/h, pressure in bar, temperature in °C, pipe size DN, flange standard, and hazardous area requirement. Contact Silver Automation Instruments at Tel +86-25-68650347, WhatsApp +86-25-52155837, or WeChat +86 15365082610.
For K40 industrial gas rotameter price, delivery, or technical selection, send your operating data to Silver Instruments. Our application engineers can confirm the flow range, pressure drop, material, and approval within one working day.
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