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.
Thermal Dispersion Airflow/Temperature Measurement Device (ATMD) for Round Ducts
Hospital, laboratory and clean room ducts
Outdoor air intakes to fan coils
Makeup air ducts to air handlers
Built-in transmitter provides a linear analog airflow output signal
Can be configured to provide the equivalent velocity pressure output in lieu of airflow
Thermal dispersion technology
Calibrated from 0 to 3,000 FPM
Stable bead-in-glass thermistor sensors
NIST traceable airflow and temperature measurement
Calibrated to volumetric airflow standards
Accurate and repeatable
Field calibration is not required
Fits standard 4 to 16 inch round ducts
Easy to install insertion probe design
Available in aluminum or stainless steel
The GF-A1000-DI airflow measurement device is a low cost, high performance, solution for airflow measurement in smaller round ducts. 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.
The GF-A1000-DI airflow measurement device is designed for duct insertion applications. Probes are available with one or two sensor nodes. Installed airflow accuracy is ±4% of reading to NIST traceable standards when installed in accordance to published placement guidelines.
The GF-A1000-DI measurement device uses the principal of thermal dispersion to determine the airflow rate. Thermal dispersion is ideal for HVAC applications that typically require measurement of low air velocities. Each sensing node uses two thermistors to determine airflow. One thermistor is self-heated above ambient while a second thermistor determines the ambient air temperature. The power dissipated into the airstream is directly related to the airflow rate.
Each thermistor body is a hermetically sealed bead-in-glass probe. Bead-in-glass thermistors have demonstrated extreme stability and superior performance over chip type thermistors used by other manufacturers. The bead-in-glass sensor used has been time tested for over 35 years by GreenTrol’s sister company, EBTRON. Thermistors are potted in a waterproof sensor assembly and are designed for years of trouble-free operation.
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.
Airflow Measurement: Provides the average airflow rate in FPM [m/s] to analog output AO1.
Output Scaling: Set by DIP switch
Airflow/Temperature Measurement Probe
Type:-DI Duct Insertion Thermal Dispersion Airflow and Temperature Measurement Probe
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
Material: Mill finish 6063 aluminum (optional: 316 SS)
Probe Mounting Brackets
Material: 304 stainless steel
Probe Mounting: Insertion
Sensing Node Housing
Sensor Potting Materials: Waterproof marine epoxy
Sensing Node Internal Wiring
Material: Kynar® coated copper
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
Averaging Method: Independent, velocity weighted
Accuracy: ±0.15⁰F [0.08 ⁰C]
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
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
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
156 Holly View Lane Loris, SC 29569 Toll Free 877 446 8765