Rev 4/14/21
Operation:
Upon power up the unit performs a self test and will play the following audio alert, “Carbon Monoxide Detector Test OK”. The Green LED will flash
then extinguish. After two minutes of stabilization, the Green LED should illuminate steadily.
CO Alerts:
• Low: 50 to 100 PPM - Flashing green LED, Voice Alert: "Caution, Carbon Monoxide", Relay connected to ground
• Medium: 100 to 400 PPM - Steady Red LED, Voice Alert: "Warning, Carbon Monoxide", Relay connected to ground
• High: Greater than 400 PPM - Flashing Red LED, Voice Alert: "Danger, Carbon Monoxide", Relay connected to ground
Alerts for lower concentrations of CO are delayed. As the concentration increases to 400PPM alerts occur more quickly.
To acknowledge an alert PRESS the button. The following acknowledgement steps occur:
• Prevents further audio alerts
• Opens the Relay
• Clears the alert signal sent to the EFIS
• The LED will flash green then continue to display alert status
NOTE: The Detector will continue to send the CO concentration to the EFIS for pilot monitoring. The alert condition is automatically cleared when
the concentration drops below 50PPM.
Some EFIS manufacturers enable the EFIS to send an acknowledgement command to the Detector by pressing a button on the EFIS. An EFIS
acknowledgement performs the same steps as above.
CO Alert Procedures:
• Turn off the cabin heat
• Open fresh air vents and windows
• Land and correct the source of CO
Altitude Alerts:
The following altitude Alerts are provided:
• 10,000’: Voice Alert: "Cabin Altitude", Momentary EFIS altitude alert
• 12,500’: Voice Alert: "Cabin Altitude", Momentary EFIS altitude alert
• 14,000’: Voice Alert: "Cabin Altitude", Continuous EFIS altitude alert
The altitude alert will reset below 9500’
The altitude alert may be acknowledged and cancelled by PRESSING the button.
Maintenance:
The sensor in the GD-40 has a demonstrated service life of more than 10 years. At power up and periodically during operation, the detector
performs a self test to confirm it’s integrity. If a problem is detected, “Carbon Monoxide Detector Test Fail” will be played via the audio system.
There are two failure modes that can occur after power up: 1) The LED will flash RED and GREEN for a sensor failure or 2) The LED flash RED
for an internal memory failure. In the case of an internal memory failure, the unit will operate normally, but with less accuracy.
Replacement of the sensor and recalibration of the unit must be performed at the factory. Contact us to make arrangements for sensor
replacement and recalibration service.
A date code is printed on the sticker on the outside of the unit. For four digit codes, the first number in the code is the year of manufacture of
the unit the second three numbers are the day of the year. Example “1302” translates to the 302nd day of 2011. For five digit date codes the
first two numbers are the year and the second three are the day of the year.
Need Help?
or call (831) 325-3131
Specifications:
Input Voltage: 12-28 Volts DC
Dimensions: 4.7” X 3.1” X 1.0”
Weight: 4.1 oz.
Altitude Compensated to 25000’ Cabin Altitude
Detects as low as 10 PPM CO Concentration
