GDC-350 Operation Manual
5909-9000 Rev 1
3
1.4. Sensor Aging and Calibration Extending Firmware (CEF)
GDC-350 systems with on-board electrochemical sensors have been programmed
with our CEF (Calibration Extending Firmware). This firmware takes into
consideration the aging of the electrochemical CO, NO and NO
2
sensors so that less
frequent calibrations are acceptable in non-critical applications such as parking
garages. The system tracks the age of the sensor and automatically compensates for
the degraded output of the sensor as it ages.
2. SPECIFICATIONS
2.1. Controller Specifications
Categories/Subcategories
Descriptions
Enclosure
Type
Standard (NEMA 1X)
Water Tight (NEMA 4X)
Dimensions
H x W x D
5.25 x 6.75 x 2.63
(in)
133 x 172 x 67
(mm)
5.13 x 7.13 x 4.00
(in)
130 x 181 x 102
(mm)
Weight
1.2 lbs (0.6 kg)
1.4 lbs (0.7 kg)
Construction
Polycarbonate with
hinged, secured door
(drip resistant)
Polycarbonate with
hinged, secured door
(water tight)
Wiring
Power
24 V (nominal), DC or AC (50/60 Hz)
Remote
Sensor
500’ maximum distance between controller and
remote sensor using minimum 18 gauge wire
User
Interface
Display
Common set of LED indicators (4) for:
Power, Fail, Low (Warning) Gas Alarm,
High Gas Alarm
Sensor indicators (2) for:
Sensor 1, Sensor 2
4-digit 8-segment LED digital display (optional)
Audio
Integral alarm rated 80 dB @ 10’
Buttons
Push-button to silence audible alarm
Relays
Two DPDT dry-contact relays (rated 5 A @ 240 VAC)
1
Control
Settings
2
Relays
(DIP Switch)
Low Gas Alarm “On” Delay (on “make”) 5 min
Low Gas Alarm “Off” Delay
3
High Gas Alarm “On” Delay (on “make”) 5 min
(on “break”) 10 min
Audio
Audible Alarm “On” Delay (on “make”) 5 min
Audible Alarm Feature (on/off)
Environ-
mental
Temperature
0° to 40° C (32° to 104° F)
Humidity
0 to 95% RH non-condensing
1
System is configured such that all relays are “FAIL SAFE” (relay coils are always
energized in non-alarm state). Relays are “common” to both channels (activated by
either channel).
2
May be set by user
3
Also known as “minimum run time”