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Suitable for measuring dirty air flow through heated mass-flow sensor technology, this air velocity transmitter runs four selectable ranges from 250 to 2000 FPM. In addition, this transmitter runs with an isolated 4 to 20 mA output and a corresponding metric range of 1.25 to 10 MPS.
Suitable for measuring dirty air flow through heated mass-flow sensor technology, this air velocity transmitter runs four selectable ranges from 250 to 2000 FPM. In addition, this transmitter runs with an isolated 4 to 20 mA output and a corresponding metric range of 1.25 to 10 MPS.
Features
Applications
| Service | Air and compatible non-combustible gases from 250 to 2000 FPM (1.25 to 10 MPS) |
| Accuracy | 5% FS process gas: 32 to 122°F (0 to 50°C) 6% FS process gas: -40 to 32°F and 122 to 176°F (-40 to 0°C and 50 to 80°C) |
| Response Time | Flow: 1.5 seconds to 95% of final value (output filter set to minimum) |
| Temperature Limits | Process: -40 to 176°F (-40 to 80°C) Ambient: 32 to 140°F (0 to 60°C) |
| Humidity Limit | Non-condensing |
| Power Requirements | 12 to 35 V DC / 10 to 16 V AC 1.5 A rating required on supply due to initial power surge drawn by transmitter |
| Output | Signal: 4 to 20 mA, isolated 24 V source, 3 or 4-wire connection Filter: selectable 0.5 to 15 seconds |
| Loop Resistance | 600 Ω |
| Current Consumption | 300 mA maximum* *A brief current transient exceeding 300 mA may be seen on startup. |
| Electrical Connections | Screw-type terminal |
| Enclosure Rating | Designed to meet NEMA 4X (IP66) |
| Mounting Orientation | Mounting not position sensitive |
| Dimensions | 1.72 x 9.25" (43.66 x 235 mm) |
| Weight | 0.79 lbs (357.2 g) |
Click on a category to view a selection of compatible accessories with the Dwyer 641B-4 Air Velocity Transmitter, 250 to 2000 FPM.
| Service | Air and compatible non-combustible gases from 250 to 2000 FPM (1.25 to 10 MPS) |
| Accuracy | 5% FS process gas: 32 to 122°F (0 to 50°C) 6% FS process gas: -40 to 32°F and 122 to 176°F (-40 to 0°C and 50 to 80°C) |
| Response Time | Flow: 1.5 seconds to 95% of final value (output filter set to minimum) |
| Temperature Limits | Process: -40 to 176°F (-40 to 80°C) Ambient: 32 to 140°F (0 to 60°C) |
| Humidity Limit | Non-condensing |
| Power Requirements | 12 to 35 V DC / 10 to 16 V AC 1.5 A rating required on supply due to initial power surge drawn by transmitter |
| Output | Signal: 4 to 20 mA, isolated 24 V source, 3 or 4-wire connection Filter: selectable 0.5 to 15 seconds |
| Loop Resistance | 600 Ω |
| Current Consumption | 300 mA maximum* *A brief current transient exceeding 300 mA may be seen on startup. |
| Electrical Connections | Screw-type terminal |
| Enclosure Rating | Designed to meet NEMA 4X (IP66) |
| Mounting Orientation | Mounting not position sensitive |
| Dimensions | 1.72 x 9.25" (43.66 x 235 mm) |
| Weight | 0.79 lbs (357.2 g) |
Click on a category to view a selection of compatible accessories with the Dwyer 641B-4 Air Velocity Transmitter, 250 to 2000 FPM.
