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Device (AMD) for Round Ducts
Thermal Dispersion Airflow/Temperature Measurement Device (ATMD) for Round Ducts
The GF-A1000-DI airflow measurement device is a low cost, high performance, solution for airflow measurement in smaller round ducts. Designed for insertion mounting, the GF-A1000-DI is provided with an integral transmitter. Simply provide 24 VAC/DC power and connect the output cable wires to a BAS or other analog input device to determine the airflow rate. Available in aluminum or stainless steel. Fits 4 to 16 inch round ducts.
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]
GP1
Type: Binary Input (BI1)
Assignment: Mode activation trigger signal
Configurable Ranges: 0-24VAC or 0-24VDC
Trigger Threshold:
VAC Configuration: 7 VAC
VAC Configuration: 3 VAC
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 & Power Requirements
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
