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Fox FT1 Flow Meter Features: Utilizing Digital Thermal Mass Technology for Direct Gas Sizing
Quick Answer
Quick Answer: The Fox FT1 is a thermal mass flow meter that measures gas mass flow directly in kg/h, Nm3/h, or scfm. It does not need separate pressure and temperature transmitters for direct gas sizing. Send Silver Automation Instruments your gas type, pipe size in DN, pressure in bar, temperature in °C, and flow range for a price estimate.
What Direct Gas Sizing Means on the Fox FT1
Direct gas sizing means the meter reports mass flow without external density compensation. Inside the Fox FT1, the heated sensor and reference sensor are platinum RTD elements with a PT100 class response. Gas flow removes heat from the heated sensor. The transmitter converts that heat loss into a mass flow signal. Because the primary measurement is mass flow, you do not need a flow computer to calculate density from pressure and temperature.
In practice, this simplifies installation on gas lines. A natural gas line in a food plant can have pressure swings from 2 bar to 5 bar. The Fox FT1 still reports kg/h. You do not need to retune a differential pressure transmitter or correct for temperature drift at different operating points. Here is the thing. Many volumetric meters need density correction. The FT1 skips that step for most clean gas flows.
Key Specifications for Procurement
The Fox FT1 supports insertion and inline body configurations. Common line sizes start at DN15 for inline and DN50 or larger for insertion probes. The transmitter outputs 4-20 mA HART and RS485 Modbus RTU as standard. Some sites add a local display with a flow totalizer. Power supply can be 24 VDC or 85 to 265 VAC depending on the transmitter option. The standard enclosure is IP66. Process temperature ratings reach 200 °C. Pressure ratings depend on the probe assembly and often reach 40 bar for insertion models.
Accuracy is typically plus or minus 1 percent of reading plus 0.5 percent of full scale. Turndown can reach 100 to 1. This means a meter sized for 1000 kg/h air can still read 10 kg/h during low demand. We have seen this help a wastewater plant in Malaysia where night air load was much lower than day load. Repeatability is often better than 0.2 percent of reading. Because the sensor has no moving parts, maintenance is low compared to turbine meters or rotary meters.
As a Fox FT1 flow meter supplier, Silver Automation Instruments supports plant engineers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. We help you select insertion or inline configurations and keep local language support for technical review.
Typical Applications for the Fox FT1
At Silver Instruments, we see Fox FT1 inquiries from food and beverage plants in Indonesia, chemical sites in Thailand, oil and gas terminals in Nigeria, and water authorities in Australia. Common uses include aeration air flow, nitrogen blanketing, natural gas feed to boilers, biogas from digesters, and compressed air audits.
For a dairy processor in Vietnam, a nitrogen blanket on edible oil tanks needed low flow measurement at 0 to 50 kg/h on a DN25 line. The insertion model would not fit that small line. We quoted an inline thermal
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How to Select the Right Fox FT1 Configuration
The first step is to list normal flow, minimum flow, and maximum flow. Use the same engineering unit for all three values. Add gas composition because a meter calibrated for air will have a large offset on hydrogen or carbon dioxide. Tell us the pipe material, pipe ID, and whether the pipe is round duct or square duct. Include temperature and pressure at the meter location. Also confirm if the area has a hazardous area classification such as ATEX Zone 1 or NEC Class 1 Division 1.
Silver Instruments can provide a sizing worksheet. Most engineers skip this part. They send only flow rate and pipe size. Then we ask about gas composition and pressure. That back and forth delays the quote by one or two days. Sending complete data on the first enquiry helps us recommend the correct probe length, insertion depth, and flow conditioner if needed.
Five Questions Before You Request a Quote
What Gas Types Can the Fox FT1 Measure?
The Fox FT1 is factory calibrated for a single gas such as air, nitrogen, natural gas, oxygen, argon, or carbon dioxide. It is not suitable for unknown mixed gas streams or condensing wet gas. For biogas with variable methane content, we need a gas analysis before sizing.
Does the Fox FT1 Need Pressure and Temperature Compensation?
No. Thermal mass flow meters measure mass flow directly. You do not need an external pressure transmitter or temperature transmitter for gas sizing. Pressure and temperature still matter for calibration and for mechanical design limits.
What Is the Typical Turndown and Accuracy?
The FT1 can hold a turndown around 100 to 1 with accuracy typically plus or minus 1 percent of reading plus 0.5 percent of full scale. Repeatability is better than 0.2 percent of reading on many installations. These values depend on gas type, line size, and flow profile.
Can the Fox FT1 Be Installed in Hazardous Areas?
Yes. Configurations for ATEX Zone 1 or Class 1 Division 1 are available. You must specify the exact class, zone, and gas group when requesting a quote. The electrical outputs and enclosure options change with the approval.
What Data Does Silver Instruments Need for a Fox FT1 Quote?
Send us gas type, gas composition if mixed, normal flow in kg/h or Nm3/h, minimum flow, maximum flow, pipe size in DN or pipe ID, pressure in bar, temperature in °C, and target output signal. Also tell us the installation type, insertion or inline. Reach Silver Instruments on Tel +86-25-68650347, WhatsApp +86-25-52155837, WeChat +86 15365082610.
Next Step
For a Fox FT1 price estimate, include quantity, gas type, line size, and required approvals. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. The team at Silver Automation Instruments will reply with a model recommendation, accuracy estimate, and lead time. Our product pages at flow-meter.com.au also show related thermal mass flow meters for air, inert gas, and natural gas applications.
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