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641-12 | Air velocity transmitter | 12" (304.8 mm) probe length. | Dwyer Instruments
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Dwyer Instruments NCO-641-12 Air Velocity Transmitter with 12" Probe
Dwyer Instruments NCO-641-12 Air Velocity Transmitter is a reliable and accurate instrument designed to measure air velocity in various industrial and commercial applications. With its rugged construction and advanced features, this transmitter ensures precise and dependable performance.
The NCO-641-12 features a 12-inch probe, making it ideal for measuring airflows in ducts, vents, and other confined spaces. The transmitter utilizes a precision thermistor sensor to provide accurate velocity readings and is equipped with a 4-20 mA output signal for easy integration with control systems.
This air velocity transmitter is housed in a durable enclosure that protects it from harsh environments. Its compact design allows for easy installation and maintenance. The NCO-641-12 is widely used in HVAC systems, clean rooms, and other applications where accurate air velocity measurement is critical.
Technical Specifications:
- Probe Length: 12 inches
- Output Signal: 4-20 mA
- Accuracy: ±2% of reading or 5 FPM
- Repeatability: ±1% of reading or 2.5 FPM
- Response Time: <1 second
- Operating Temperature: 32°F to 120°F (0°C to 49°C)
- Storage Temperature: -40°F to 158°F (-40°C to 70°C)
- Dimensions: 5.25" x 3.5" x 1.75"
- Weight: 1.5 pounds
Our HVAC supply store offers the Dwyer Instruments NCO-641-12 Air Velocity Transmitter at competitive prices with fast shipping. Contact us today to place your order or for expert assistance with your industrial equipment needs.
Series 641 Air Velocity Transmitter
High Accuracy, Field Selectable Ranges
The Series 641 Air Velocity Transmitter 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 provides it the versatility to be selected for several air flow applications. The optional LED produces a complete, low-cost solution for local indication of air flow.
NIST CALIBRATION available in Product Configurator.
Product Applications
- Exhaust stack flow monitoring
- Air control in drying processes
- HVAC air velocity measurements
- Fan supply and exhaust tracking
- Clean room fresh air supply
- Ensure proper lab hood exhaust flow rates
- Ranges from 250 FPM (1.25 MPS) to 15,000 FPM (75 MPS)
- Optional bright LED display
- Easy push button set-up
- Compact housing
- 4 to 20 mA output
- Digital filter for signal damping
Specifications
- Series
- 641 Air Velocity Transmitter
- Category/Type
- Air Velocity
- Type
- Air Velocity Transmitter
- Series
- 641 Air Velocity Transmitter
- Service
- Clean 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 s to 95% of final value (output filter set to min.).
- 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 to 35 VDC; 10 to 16 VAC. 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.
- Output Filter
- Selectable 0.5-15 s.
- Loop Resistance
- 600 Ω max.
- Current Consumption
- 300 mA max.
- Electrical Connections
- Screw terminal.
- Process Connections
- 1/2" male NPT.
- Enclosure Rating
- Designed to meet NEMA 4X (IP66) for non LED models only.
- Mounting Orientation
- Unit not position sensitive. Probe must be aligned with airflow.
- Weight
- 12.6 oz (357.2 g).
- Agency Approvals
- CE.
- 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
- 13.3 oz (377 g).
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