GreenFlow GF Series
Airflow/Temperature Transmitter Module w/Contact Closure Airflow Alarm


GreenFlow GF Series
Airflow/Temperature Transmitter Module w/Contact Closure Airflow Alarm

The GF-N3000 transmitter is functionally the same as the GF-A2000 with the excpetion 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


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

User Interface

Display: 16-character alpha-numeric LCD

Navigation: 4-button interface

Integrated Sensor Capability

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

Network Connection


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

Contact Closure Relay


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, Power Requirements & Dimensions

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

GreenTrol Automation

156 Holly View Lane Loris, SC 29569 Toll Free 877 446 8765

Find a Rep Near YouCancel
Rep Finder

Select Your Country/Region

Enter your Zip Code