MEGA-TMF450 measures the gas mass flow based on Thermal Diffusion principle. One sensor measures the velocity of gas flow (Rh) and the other sensor detects the temperature shift of gas flow (Rmg). When there are two RTDs in the gas flow, Rh will be heated and Rmg will sense the temperature difference. As the velocity of gas flow increases, more heat will dissipate and so the temperature read by Rh will decline.
MEGA-TMF450 Thermal Mass Flowmeter design is based on a constant power measuring method, thus the RTD is heated on a consistent power and will be more durable and stable. Due to that, TMF-450 meter has less problem of zero-off which may cause a function failure of RTD due to overheating the term.
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| Media capability | Air, Nitrogen (N2) |
| Pipe diameter | 1" to 16" |
| Flow velocity range | 0.3-30, 0.6-60, 0.9-90, 1.2-120, 1.5-150Nm/s |
| Accuracy | ±1.5% FS |
| Maximum Pressure | 1.6MPa |
| Temperature of medium | -40 °F to 302 °F (-40 °C to 150 °C) |
| Power supply | 13.5 to 42 VDC or 85 to 265 VAC |
| Response time | 1 second |
| Output | Pulse and 4-20 mA |
| Communication | RS485 or HART |
| Display Indication | Mass flow, Volume flow in normal condition, Total flow, Temperature of medium, Velocity |
| Signal output | 4-20mA (std), Pulse (opt) |
| Protection | IP65 |
