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Dwyer Series 641RM Air
Velocity Transmitter with Cable
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| For Remotely Mounting Electronic
Enclosure |
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 The
Series 641RM is the ideal instrument for
monitoring air flow. This transmitter uses a heated mass flow sensor,
which allows for precise velocity measurements at various flow
rates and temperatures. The 641’s 16 field selectable ranges
from 0-250 to 15,000 FPM (0-1.25 to 75 MPS) provide it the versatility
to be selected for a multitude of applications. The units 6' cable
which connects the sensing probe with the electronic enclosure
allows the enclosure to be mounted where it can be more easily
accessed. Longer cable lengths are available fro ducts that are
at very high elevations from the plant floor. The optional LED
produces a complete, compact solution for local indication of air
flow. Dimensional
Information |
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| SPECIFICATIONS |
Service: Air and compatible, non-combustible
gases.
Accuracy:
3% FS Process gas: 32 to 122°F (0 to 50°C).
4% FS Process gas: -40 to 32°F & 122 to 212°F
(-40 to 0°C & 50 to 100°C).
Response Time: Flow: 1.5 seconds to 95% of final value (output filter
set to minimum).
Temperature Limits: Process: -40 to 212°F (-40 to 100°C). Ambient:
32 to 140°F (0 to 60°C).
Pressure Limit: 100 psi (6.89 bar) maximum.
Humidity Limit: Non-Condensing.
Power Requirements: 12–35 VDC, 10–16 VAC.
Output Signal: 4-20 mA, isolated 24V source, 3 or 4-wire connection.
Output Filter: Selectable 0.5 –15 (seconds).
Loop Resistance: 600 ohms max.
Current Consumption: 300 mA max.
Electrical Connections: Screw terminal.
Mounting Orientation: Unit not position sensitive. Probe must be aligned
with airflow.
Weight: 13.2 oz (374.26 g).
Cable Length: 6 ft (1.82 m).
Probe Length: 12" (30.48 cm) standard.
Probe Diameter: 5/16" (0.79 cm). |
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| OPTIONAL DISPLAY VERSION: |
Display: 4-1/2 digit 1/2" red LED.
Resolution: 1 FPM, 0.01 MPS (10 FPM @ 10,000 and 15,000
FPM ranges).
Weight: 13.9 oz (394.16 g). |
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| ACCESSORIES |
A-156 - Universal Mounting Plate, 1/2" Female
NPT
A-158 - Split Flange Mounting Kit
A-159 - Duct Mounting Gland |
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| POPULAR MODELS |
| Model
Number |
Description |
| 641RM-12 |
Air Velocity Transmitter with 6' cable |
| 641RM-12-LED |
Air Velocity Transmitter with 6' cable and LED
display |
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| ACCESSORIES |
| Model Number |
Description |
| A-156 |
Universal Mounting Plate, 1/2" Female NPT |
| A-158 |
Split Flange, Used with Series 160 Pitot Tubes |
| A-159 |
Mounting Gland, Used with Series 160 Pitot Tubes |
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