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• The Automatic Alarm Reset operates as described below:
AUTOMATIC ALARM RESET (DEFAULT)
The trip point, hysteresis and delay time of each alarm can be programmed via the menu. For example,
Alarm1 defaults to a 50 ppm CO trip point, 10 ppm hysteresis and 2 minute delay time. Alarm2 defaults
to a 150 ppm CO trip point, 20 ppm hysteresis and 2 minute delay time All of these values can be
changed via the menu. In the example for Alarm1, a timer is started when the CO level exceeds 50 ppm
(the trip level). If the level drops below 50 ppm before 2 minutes (the delay time) has expired, then the
alarm is not activated. If the CO level exceeds 50 ppm for 2 minutes then the alarm is activated. The alarm
will remain activated until the CO level drops below 40 ppm (trip level – hysteresis). This alarm can be
used to signal a “low alarm”. Alarm2 operates in the same manner and has independently programmable
trip point, hysteresis and delay time. This alarm can be used to signal a “high alarm”. The LCD will indicate
the Alarm mode details and the LED will flash red. If the device has the optional relays, then Relay1 is tied
to Alarm1 and Relay2 is tied to Alarm2.
The buzzer alarm defaults to a 150 ppm CO trip point and 5 minute delay time and can be programmed
similarly to Alarm1 and Alarm2. When the trip point is exceeded for a time longer than the delay
time, then the buzzer will sound until the CO level falls below the trip point. The buzzer operates
independently of Alarm1 and Alarm2 and can be disabled via the menu. If enabled, and the device is in
Alarm mode, pressing the TEST switch will "silence" the buzzer only. Buzzer silence will only hold until the
buzzer alarm condition is cleared so the next buzzer setpoint alarm will activate the buzzer again. The
TEST switch will not change status of LEDs, only silence the Buzzer.
The Strobe alarm defaults to a 150 ppm CO trip point and 5-minute delay time and can be programmed
similarly to buzzer alarm. When the trip point is exceeded for a time longer than the delay time, then the
Strobe LED will flash until the CO level falls below the trip point. The Strobe LED operates independently
of Alarm1 and Alarm2 and can be disabled via the menu. If enabled, and the device is in Alarm mode,
pressing the TEST switch will have no impact on Strobe.
MANUAL ALARM RESET
In this case, the alarms will activate the same way as described above but will not automatically reset to
Normal Mode when the CO level drops below the trip level - hysteresis value. In order to reset the alarms
to Normal Mode the user must also press the TEST switch on the front cover (or activate the remote TEST
input). If the CO level is below the alarm level AND the TEST switch is pressed, then the alarms will return
to the Normal Mode.
The Manual Reset also applies to the buzzer alarm. If the buzzer alarm is active, pressing the TEST switch
will "silence" the buzzer. If the buzzer alarm was active but the CO level has been reduced below the trip
point, then the TEST switch must be pressed to reset the buzzer alarm to the Normal Mode.
OPERATION - TEST MODE
The Test mode function is disabled by default, it must be enabled via the menu to operate. To initiate the
Test function during normal operation, either press and hold the TEST switch, located on front cover for
1 second or activate it remotely by shorting the TEST + to COM. This will cause the Status LED to blink
red, all analog outputs to go to 100% and both alarms to activate. The buzzer will also beep once every
15 seconds if enabled and the LCD will indicate the Test mode and the remaining time. The Test function
will continue for 5 minutes (default) and then the device will reset to normal operation. The Test function
can be canceled by pressing the TEST switch a second time. Test mode cannot be activated if the device
is in Fault, Alarm or Re-Cal modes of operation, only in Normal mode. The Test function is useful to verify
the output and alarm relay operation and the Test time can be programmed via the menu. The Test Mode
display will show even if the LCD mode is set to off.
• The LCD will display an alarm if a sensor POD is not communicating and the buzzer will beep once
every ten minutes. The buzzer can be silenced by pressing the TEST switch.
NO2 Sens
Error
CO Sens
Error
TestMode
300 Sec
TestMode
299 Sec
IN-GE-GDTXXX-06
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