Description
The GDT Series of gas monitoring sensors monitor levels of carbon monoxide (CO) and/or nitrogen dioxide (NO2) to provide an early warning of elevated concentrations.
The GDT is available as a standalone CO or NO2, as well as a CO/NO2 dual sensor device. The dual sensor device is available in 2 configurations: CO/NO2 housed one enclosure or as CO with remote NO2 sensor for mounting at a higher location.
The GDT gas sensors are encapsulated in field replaceable sensors pods that are located on the bottom of the enclosure. The pod design provides a greater area of gas sampling then that of devices that utilize a single vent hole. Replacement pods come pre-calibrated and ready for installation.
The GDT is available with either Analog, BACnet or Modbus outputs for communication with a building automation system. Standard features include LCD display for configuration and local display as well as status LED’s. Optional features include: 1 or 2 adjustable control/alarm relays, adjustable audible (buzzer) & visual (strobe) alarms as well as various temperature sensor.
The GDT is housed in an IP65 polycarbonate enclosure with a hinged and gasketed cover that provides ease of installation and access for set up and configuration.
Please specify in the Order comments field, whether you need Analog Output or DC Voltage Output options, Concealed or Visible LCD display.
For Relay, Audible/Visual Alarm, Temperature Sensor or BACnet MSTP/Modbus RTU options, please contact us.
Features
- Setup/calibration fully menu driven
- Selectable ranges of 0-100, 150, 300, 400 or 500 ppm
- Replaceable Electrochemical sensing element
- Optional on board relays with field adjustable trip point.
- Optional BACnet or Modbus communications
- Powered by either an AC or DC source
- Choice of three field adjustable analog output signals
- Easy to calibrate in the field
Specifications
Specifications for all Models
| GAS TYPE DETECTED | Carbon Monoxide (CO) and/or Nitrogen Dioxide (NO2 ) |
| SENSOR TYPE | Electrochemical, diffusion sampling |
| SENSOR APPROVALS | CO Sensor is a UL approved component for UL 2075/with UL 2034, File No. E240671 |
| SENSOR ACCURACY |
Carbon Monoxide: ±5 ppm or ±5% of reading |
| MEASUREMENT RANGE |
Carbon Monoxide: 0-500 ppm, adjustable 100-500 ppm Nitrogen Dioxide: 0-10 ppm |
| RESPONSE TIME | < 30 seconds typical |
| WARM-UP TIME | 1 minute |
| SENSOR COVERAGE AREA | 700m2 (7500ft2 ) or 15m (50ft) radius |
| SENSOR LIFE SPAN |
Carbon Monoxide: 5-7 years in air Nitrogen Dioxide: 2 years |
|
SENSOR REPRODUCIBILITY (SAME DAY) |
±2% |
| LONG TERM DRIFT |
Carbon Monoxide: <5% per year Nitrogen Dioxide: Zero - <±2 ppm/year Span - <2% signal/month |
| POWER SUPPLY | 24 Vdc ±20% or 24 Vac ±10% (non-isolated half-wave rectified) |
| PROTECTION CIRCUITRY | Reverse voltage and transient protected |
| OUTPUT SIGNAL TYPE | 4-20 mA (3-wire), 0-5 Vdc/0-10 Vdc, BACnet® or Modbus |
| NETWORK INTERFACE |
Hardware: 2 wire RS-485 Software: Native BACnet® MS/TP or Modbus RTU Baud Rate: Locally set 9600, 19200, 38400, 57600, 76800, or 115200 MAC Address Range: 0-255 (Factory default is 1) (128 devices max on one daisy chain) |
| CURRENT CONSUMPTION | 425 mA @ 24 Vac max, 220 mA @ 24 Vdc max (test mode) |
| OUTPUT DRIVE @ 24 VDC |
Current: 550Ω maximum Voltage: 10,000Ω minimum |
| AMBIENT OPERATING RANGE | -20 to 50°C (-4 to 122°F), 15 to 90 %RH non-condensing |
| STORAGE TEMPERATURE | -30 to 60°C (-22 to 140°F) |
| LCD |
Viewable or concealed (with cover closed) Units: ppm for CO/NO2 , °C/°F for optional temperature Size: 35mm W x 15mm H (1.4” x 0.6”), alpha-numeric 2-line x 8 characters Backlight: Enable or disable via menu |
| USER INTERFACE |
Silence/Test button, Bi-color status LED, Red LED alarm indicator, White high intensity LED strobe (optional) |
| OPTIONAL TEMPERATURE SIGNAL |
Type: Thermistor or RTD Accuracy: Thermistors - ±0.2˚C (±0.36˚F) @ 25˚C (77˚F) Platinum RTD’s - ±0.3˚C (±0.54˚F) @ 0˚C (32˚F) Nickel RTD’s - ±0.4˚C (±0.72˚F) @ 0˚C (32˚F) Output: 2-wire resistive Type: Analog, BACnet® or Modbus Sensor Accuracy: ±0.2°C (±0.36˚F) Range: -20 to 50°C (-4 to 122°F) or 0 to 50°C (32 to 122°F) (field selectable) Output: Analog - 0-5/0-10 Vdc or 4-20mA (As per output selected) BACnet®/Modbus - Network Variable |
| OPTIONAL RELAY OUTPUTS | Contact Ratings: Form C (NO + NC), 5 Amps @ 140 Vac, 5A @ 30 Vdc Relay Setpoint + Hysteresis: Programmable via menu Relay Time Delay: Programmable via menu |
| OPTIONAL ALARM | Audible: Buzzer, 93dB @ 30 cm Visual: High intensity white LED strobe |
| MAIN ENCLOSURE |
Material/Rating: Grey Polycarbonate, UL94 V0, IP65 (NEMA 4X) with Security Screw installed Dimensions Incl. Sensor Pod: 202.3mm H x 184mm W x 54.3mm D (8” x 7.24” x 2.15”) Weight Incl. Sensor Pod: 515 grams (1.14 lbs) |
| REMOTE NO2 ENCLOSURE |
Material/Rating: Grey Polycarbonate, UL94 V0, IP65 (NEMA 4X) Dimensions Incl. Sensor Pod: 109.5mm H x 83.3mm W x 52mm D (4.31” x 3.28” x 2.05”) Weight Incl. Sensor Pod: 109 grams (0.24 lbs) |
| WIRING CONNECTIONS | Screw terminal block (14 to 22 AWG), Top or bottom conduit entry 22.73mm (0.875”) hole |
| APPROVALS | CE |
| COUNTRY OF ORIGIN | Canada |