Description
FEATURES
- NDIR CO2 sensing technology
- 0 to 2,000 ppm range
- ABC logic ensures long-term calibration stability
- Planar capacitive polymer RH sensor
- Integral bandgap PTAT temperature sensor
- Non-Isolated RS-485 output circuitry
- Time-tested and reliable BACnet and Modbus firmware
- Field selectable BACnet MS/TP or Modbus RTU protocols
- BACnet master
- DIP switch selectable baud rates
- Attractive wall-mount package
- DIP switch selectable baud rates
- Attractive wall-mount package
- Compatible with all GreenTrol application specific controllers
- Operates on 24 VAC/DC
OVERVIEW
The GS-N300-W is a high performance CO2 sensor for today’s demanding DCV applications. Temperature and relative humidity are provided over a single network connection for a fraction of the cost of providing separate RH and temperature transmitters.
Unlike competitive network sensors the GS-N300-W uses time-tested and reliable BACnet MS/TP and Modbus RTU firmware. Its reliablilty makes it the only approved wall mounted RS-485 CO2/RH/T sensor for GreenTrol outdoor air controllers.
When combined with a GreenTrol outdoor air controller, this CO2 sensor can be used to improve traditional CO2 demand control ventilation by using a unique control algorithm that resets the outdoor air setpoint between user defined upper and lower airflow limits (not damper positions) to maintain the space CO2 level. This control method eliminates the under- and over-ventilation that is prevalent with traditional CO2-DCV.
An even more advanced control method uses the measured airflow rate and CO2 level to estimate the population and calculates the required outdoor airflow, thus meeting the actual requirements of ASHRAE Standard 62.1.
Long term stability and high-performance components ensure years of trouble free performance.
FUNCTIONALITY
CO2 Measurement: Provides the CO2 level in ppm via the network connection
System Status Alarm: Yes
USER INTERFACE
Baud Rate, Protocol and Addressing: DIP switch
End of Line Termination: Jumper
Important: Modification of the factory default settings requires that power is cycled to the device. It is recommended that each device is bench configured prior to installation OR settings are provided at the time of order so that the device can be factory configured prior to shipment.
CO2 SENSOR
Technology: Telaire Non Dispersive Infrared (NDIR)
Range: 0 to 2,000 ppm
Accuracy: 400 to 1,250 ppm ±30 ppm or 3% of reading, whichever is greater 1,250 to 2,000 ppm ±5% of reading + 30 ppm
Temperature Dependence: 0.36% FS/°F [0.2% FS/°C]
Pressure Dependence: 0.33% of reading per 0.1 in. [2.54 mm] Hg
Stability: <2% of FS over life of sensor (15 year typical)
Calibration Interval: Not required when ABC logic is enabled
Response Time: <2 minutes for 90% step change typical
Signal Update: Every 4 seconds
Warmup Time: 2 minutes operational, 10 minutes to achieve maximum accuracy
TEMPERATURE SENSOR
Technology: Integral Bandgap PTAT
Range: 32 to 122 ⁰F [0 to 50 °C]
Accuracy: ±1.08 ⁰F [0.6 °C] @77 ⁰F [25 °C]
Temperature Dependence: 0.36% FS/°F [0.2% FS/°C]
Pressure Dependence: 0.33% of reading per 0.1 in. [2.54 mm] Hg
Resolution: 0.36 ⁰F [0.2 °C]
Calibration Interval: Not required when ABC logic in enabled
Response Time: <2 minutes for 90% step change typical
Signal Update: Every 4 seconds
Warmup Time: 2 minutes operational, 10 minutes to achieve maximum accuracy
RELATIVE HUMIDITY SENSOR
Technology: Planar Capacitive Polymer
Range: 0 to 100% RH
Accuracy: 1±3% <20% RH ±2% 20% to 80% RH ±3% >80% RH
Resolution: 0.4% RH
NETWORK CONNECTIONS
N1
Type: Non-Isolated, field selectable MS/TP BACnet master or Modbus RTU connection
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
ENVIRONMENTAL LIMITS, POWER REQUIREMENTS & DIMENSIONS
Environmental Limits
Temperature: 32 to 122 ⁰F [0 to 50 ⁰C]
Humidity: 5 to 95%
Power Requirement: 24 VAC (22.8 to 26.4 under load) @1.5V-A
Dimensions: 4.56H x 3.25W x 1.09D in. [115.8 x 82.6 x 27.7 mm]
