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(Specify length when ordering 4″, 5″, 6″, 7″, 8″, 9″, 10″, 12″, 14″, 16″.)
The GF-N1000-DI is a cost-effective, high-performing duct insertion airflow and temperature measurement device for round ducts. It features two thermal dispersion sensors (probe sizes 5″ to 16″ (one sensor 4″)) with an integral transmitter, delivering precise and reliable airflow readings. Each sensing node is individually calibrated at 7 points in high-performance wind tunnels. The transmitter processes each individual sensor node independently. The result is the true average airflow rate when more than one sensing node is applied. BAS connection is via RS-485 field selectable BACnet MS/TP or Modbus RTU. Installed airflow accuracy is ±4% of reading to NIST traceable standards when installed in accordance with published placement guidelines.
Airflow Measurement: Provides the average airflow rate in FPM [m/s] to analog output AO1.
Temperature Measurement: Provides the velocity weighted temperature in ⁰F [ ⁰C] to analog output AO2
Output Scaling: Set by DIP switch
Type: -DI Duct Insertion Thermal Dispersion Airflow and Temperature Measurement Probe
Available Configurations
4 inch [102 mm]: 1 probe x 1 sensor node
5 to 16 inch [127 to 406 mm]: 1 probe x 2 sensor nodes
Sensing Node Sensors
Self-heated sensor: Precision, hermetically sealed, bead-in-glass thermistor probe
Temperature sensor: Precision, hermetically sealed, bead-in-glass thermistor probe
Probe Tube
Material: Mill finish 6063 aluminum (optional: 316 SS)
Probe Mounting Brackets
Material: 304 stainless steel
Probe Mounting: Insertion
Sensing Node Housing
Material: Glass-filled Polypropylene
Sensor Potting Materials: Waterproof marine epoxy
Sensing Node Internal Wiring
Material: Kynar® coated copper
Airflow Measurement
Averaging Method: Independent, arithmetic average
Installed Accuracy: Better than ±4% of reading to NIST traceable airflow standards
Calibrated Range: 0 to 3,000 fpm [0 to 15.24 m/s]
Calibration Points: 7
Temperature Measurement
Averaging Method: Independent, velocity weighted
Accuracy: ±0.15⁰F [0.08 ⁰C]
AO1
Assignment: Linear airflow output signal or equivalent velocity pressure
Configurable Ranges: 0-5V/1-5V or 0-10V/2-10V- specify at time of order
AO2
Assignment: Temperature output signal
Configurable Ranges: 0-5V/1-5V or 0-10V/2-10V– must be same as AO1
Note: The VDC output circuit can drive the input circuit of devices designed to measure 4-wire, 4-20mA, current loops with a resistive load ≥250 ohms
Environmental Limits
Temperature: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]
Humidity: 5 to 95%
Important: Not recommended for outdoor use
Power Requirement: 24 VAC (22.8 to 26.4 under load) @5V-A
