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Luft Flow Meter: Custom Ventilation Airflow Diagnostics Instruments
Quick Answer: Silver Automation Instruments builds Luft flow meters for ventilation airflow diagnostics on industrial sites. These instruments log air velocity, volumetric flow, and temperature inside ducts from DN15 to DN300. Tell us your duct pressure, air temperature, pipe size, and flow range to get a custom quote and lead time.
What a Luft Flow Meter Does Inside a Ventilation System
A Luft flow meter sits directly in the airstream and reads real time mass or volume flow. Our custom units use a thermal dispersion sensor paired with a PT1000 temperature reference. This design gives you two values on one Modbus list: flow in Nm sup3/h and temperature in deg C. No external temperature transmitter is needed.
Engineers in food, chemical, and textile plants often choose a Luft flow meter when off the shelf probes cannot handle their duct geometry. Maybe the port is only DN40, or the internal humidity spikes to 95 percent during washdown. We produce probe lengths from 150 mm to 900 mm and can adjust the sensor head coating for saline mist or mild acid fumes.
Custom Build Options That Eliminate Field Workarounds
Standard airflow meters ship with fixed insertion depth and a single 4-20 mA output. In practice that forces maintenance teams to build adapter flanges on site or add a separate HART modem. Our custom Luft flow meters can ship with a welded DN25 tri clamp fitting, a ball valve assembly for hot tap insertion, or a PTFE lined probe for sticky exhaust from spray dryers.
Output signals are configurable. You can get dual 4-20 mA with HART, RS485 Modbus RTU, or a pulse output for totalisation. Some customers in the Middle East request ATEX Zone 2 certification because their exhaust ducts run close to solvent storage. We handle that with an intrinsically safe barrier and a screened cable gland that we label in English and Arabic.
Real Site Example from a Textile Mill in Bangladesh
Last November a dyeing and finishing plant near Dhaka ordered twelve Luft flow meters. They wanted to prove that their roof exhaust fans were pulling 18 000 m sup3/h per line after a filter upgrade. The field team installed the probes through 50 mm ball valves and mapped airflow across six departments. One meter showed a 22 percent drop on line four. The root cause was a loose bypass damper that had been left half open during commissioning. The plant manager closed the damper, airflow returned to target, and the fa
This kind of diagnostic loop is what makes custom airflow instruments valuable. You do not just measure a number. You find the exact restriction and fix it before product quality drifts.
Technical Specifications We Typically Ship
Every Luft flow meter is built to order, but most units fall inside these ranges: air velocity 0.2 Nm/s to 40 Nm/s, temperature minus 20 deg C to plus 120 deg C, duct pressure up to 6 bar, and accuracy plus or minus 1.5 percent of reading above 1 Nm/s. The electronics housing is IP67 die cast aluminium. Process connection can be a compression fitting, a DN15 or DN25 flange, or a 1.5 inch tri clamp. We include a 10 metre shielded cable with a weatherproof connector as standard.
FAQ
Can the Luft flow meter tolerate dust or lint in ventilation ducts? Yes. We can apply a sintered metal filter cap over the sensor head. This cap blocks fibres and dust without disturbing the airflow reading. The cap needs a quick compressed air blowdown every four to six weeks in heavy lint environments.
Which pipe sizes do you cover? We build insertion probes for ducts from DN15 to DN300. For rectangular ducts we provide the insertion length you specify and a mounting flange that suits your wall thickness.
How do you calibrate a custom Luft flow meter? Every meter goes through a wind tunnel calibration against a NIST traceable master. We record five points across your requested flow range and ship a printed calibration certificate with the serial number.
What is the typical lead time? A standard custom Luft flow meter ships in 15 working days. If you need ATEX certification or special coating, add five working days. We air freight to Southeast Asia, Oceania, the Middle East, Africa, and Latin America using DHL or FedEx.
Does Silver Instruments offer on site commissioning support? We provide remote video support during installation and loop checks. Our engineers join a Teams or WhatsApp call and walk your electrician through the wiring and Modbus mapping step by step.
Ready to specify your Luft flow meter? Send us your duct pressure in bar, air temperature in deg C, pipe size in DN, and the flow range you need to monitor. Email: [email protected] | Tel: +86-135-1213-1526 | WhatsApp: 86-135-12131526 | WeChat: +86 13512131526. Silver Automation Instruments will return a dimensional drawing and a commercial offer within 24 hours.