Network setup guide
The network setup guide describes the implementation of the BACnet protocol. The network setup guide assists control
system programmers who may need to add support to their systems to communicate with this device. BACnet setup
guide downloads are available online.
Technical specifications
Table 3: GS3000 Gas Detection Sensor Series technical specifications
Specification
Description
Gas type detected
CO or NO
2
Sensor type
Electrochemical, diffusion sampling
Response time
<30 s
Reproducibility:
±2%, same day
Warm-up time
1 min
Sensor coverage area
7500 ft
2
(700 m
2
) or 50 ft (15 m) radius
Accuracy:
±5 ppm or ±5% of reading
Measurement range:
0 ppm to 500 ppm, adjustable 100 ppm to 500 ppm
Long term drift:
<5% per year
Carbon monoxide
Expected lifespan:
5 to 7 years
Accuracy:
±0.2 ppm or ±5% of reading
Measurement range:
0 ppm to 10 ppm
Long term drift:
Zero: < ±2 ppm per year
Span: < 2% signal per month
Nitrogen dioxide
Expected lifespan:
>2 years
Power supply
24 VDC ±20% or 24 VAC ±10% (non-isolated half-wave rectified)
Protection circuitry
Reverse voltage-protected and transient-protected
Output signal type
4 mA to 20 mA active (sourcing) or 0 VDC to 5 VDC, 0 VDC to 10 VDC, BACnet
Hardware:
2 wire RS-485
Software:
Native BACnet MS/TP
Baud Rate:
Locally set 9600, 19200, 38400, 57600, 76800, or 115200
Network interface
MAC address range:
0 to 255, factory default is 1, 128 devices maximum on one daisy chain
Current consumption
425 mA at 24 VAC maximum, 220 mA at 24 VDC maximum, test mode
Output drive capabilities
Current: 550 ohm maximum
Voltage: 10K ohm minimum
Ambient operating range
-4°F to 122°F (20°C to 50°C), 15% RH to 90 % RH noncondensing, 0.9 atm to 1.1 atm
Storage temperature
-22°F to 140°F (-30°C to 60°C)
LCD display
Viewable or concealed, with cover closed
Units:
ppm for CO or NO
2
, °C/°F for optional temperature
Size:
alpha-numeric 2-line x 8 characters
Dimensions (H x W):
15 mm x 35mm (0.6 in x 1.4 in.)
Backlight:
Enable or disable through the Menu
User interface
Silence or test button, bi-color status LED, red LED alarm indicator, and white high intensity
LED strobe
Sensor accuracy
1K Platinum RTD:
±0.54˚F (±0.3˚C) at 32˚F (0˚C)
1K Nickel RTD:
±0.72˚F (±0.4˚C) at 32˚F (0˚C)
Sensor type:
IK Platinum or 1K
Nickel RTD
Output
2 wire resistive
Sensor accuracy
±0.2°C (±0.36˚F)
Range
-4°F to 122°F, 32°F to 122°F, -20°C to 50°C, or 0°C to 50°C,
field-selectable
Temperature sensor
Sensor type:
Analog or BACnet
Output
Analog:
0 VDC to 5 VDC, 0 VDC to 10 VDC, or 4 mA to 20 mA,
as per output selected
BACnet:
network variable
Relay outputs
Contact ratings:
Form C, NO + NC, 5 A at 140 VAC, 5 A at 30 VDC adjustable setpoints, delay
and hysteresis, programmable through the Menu
Relay time delay:
programmable through the Menu
GS3000 Gas Detection Sensor Series Installation Guide
16