Model GF-N3000


GF Series


RS-485 BACnet/Modbus Airflow/Temperature Transmitter Module w/Contact Closure Airflow Alarm

The GF-N3000 transmitter is functionally the same as the GF-A2000 with the exception that the BAS connection is via RS-485 field selectable BACnet MS/TP or Modbus RTU. In addition to airflow, temperature and alarm capability, device status is also available via the network.

  • Provide continuous verification of airflow rates
  • Ideal for monitoring applications
  • Connect to an application controller to maintain airflow rates and/or temperature
  • Demonstrate compliance with ASHRAE Standards 62.1, 90.1 and 189.1
  • Satisfy LEED prerequisites and document code compliance
  • Improve indoor air quality and thermal comfort
  • Save energy
Overview PDF



  • Compatible with GreenTrol IAT integrated thermal dispersion airflow/temperature sensors
  • LCD with push-button user interface standard
  • Measures airflow and temperature
  • Airflow and system status notification alarms
  • RS-485 network connection can be field configured for BACnet MS/TP or Modbus RTU
  • Airflow can be assigned to one or two airflow locations when more than one probe is provided
  • Contact closure relay can be assigned to notification alarms
  • “Plug and play” operation
  • Fully field configurable
  • Field adjust wizard facilitates airflow adjustment when conditions warrant.


The GF-N3000 can be provided with a single integrated IAT-DI duct probe or, one or two integrated IAT-UI or IAT-US universal mount probes.

The GF-N3000 provides a network connection for the average airflow of one or two probes. It can also be configured to output the airflow of the second probe for applications where two probes are installed in separate locations. Temperature and notification alarms are available via the network. The airflow and temperature of individual sensor nodes are available via the network, if desired. A contact closure relay is provided that can be assigned to the notification alarms. The GF-N3000 can be configured for I-P or SI units of measure.

Although the transmitter is “plug and play” and operates on power up, it is fully configurable in the field using the pushbutton interface and LCD.


Airflow Measurement: Provides the average airflow rate of one or two probes, or optionally of individual probes, in FPM [m/s] or CFM [LPS] on the LCD and via the network.

Temperature Measurement: Provides the velocity weighted or arithmetic average temperature in ⁰F [ ⁰C] on the LCD and to analog output AO2 when AO2 is assigned to temperature.

Notification Alarms

High/Low Airflow Alarm

System Trouble Alarm

Note: Alarms can be assigned to the contact closure relay


Display: 16-character alpha-numeric LCD

Navigation: 4-button interface


Type: Accepts GreenTrol IAT-DI, IAT-UI and IAT-US Thermal Dispersion Airflow and Temperature Measurement Probe (required). See appropriate IAT product data sheet for probe information.

Available Configurations: IAT-DI Probes

Single Probe: 1 probe x 1 or 2 sensor nodes/probe

Available Configurations IAT-UI and IAT-US Probes

Single Probe: 1 probe x 1 sensor node/probe

Dual Probe: 2 probes x 1 sensor node/probe



Type: Non-isolated, field selectable MS/TP BACnet master or Modbus RTU connection (provide separate transformer to each GFN1000-DI or an RS-485 network isolator if isolation is required)

B.A.S. Object/Register Read/Write Access: Yes

Device Load: 1/8 load

Supported Baud Rates: 9.6, 19.2, 38.4 and 76.8 kbaud



Type: Dry contact w/ onboard jumper to drive a remote LED

Assignment: Notification alarms

Status: Normally Open (N.O.)

Rating: 30 VDC or 24 VAC @ 3 amp. max


Environmental Limits

Temperature: -20 to 120 ⁰F [-28.9 to 48.9 ⁰C]

Humidity: 5 to 95%

Important: Provide a weather-proof enclosure if the transmitter module is mounted outdoors

Power Requirement: 24 VAC (22.8 to 26.4 under load) @8.5V-A

Dimensions: 3.57H x 6.00W x 1.50D in. [90.7 x 152.4 x 38.1 mm]

Related Documents

Data Sheets
Product Catalog