User manual

Model: EC-GOLD
ECGOLDUM17.DOC Rev: 1.7
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5.0 SELF-TEST FEATURE
The Self-test feature only applies to EC Gold units with Carbon Monoxide (CO) sensors. The sensor
health is checked by generating a small amount of Hydrogen gas in the sensor. Hydrogen produces a
response similar to CO. The amount of response is measured. With age, this response declines and is
used to determine when a sensor should be changed.
The test is initiated in 2 ways: Push to Test (on demand) and Periodic.
5.1 PUSH TO TEST
Press the Push to Test pushbutton to activate this feature. See Figure 3.0 for the pushbutton location.
When the button is pressed and released, the Status LED starts blinking green on and off every 2
seconds to indicate a test is underway.
The test lasts about 30 seconds.
If the test is successful, the Status LED goes back to steady green.
If the response is too low, the Status LED starts blinking red to indicate a sensor fault. If the sensor is
properly seated in its connector, then the sensor should be replaced.
When a sensor fault is detected, then if the sensor has been configured for Discrete Voltage Output
(DVO) mode, the output goes to 10V to signal the ISA66RLU panel the sensor fault condition. If analog
output mode is selected, then the output goes to full scale (20mA for current type and 10V for voltage
type).
The alarm sensor fault condition will continue until either the next successful self-test (either Push to Test
or Periodic), or the EC Gold power is turned off then on.
The alarms are still enabled so the yellow Low alarm and red High alarm LED’s may show alarm
depending on the sensor response and the alarm setpoints.
5.2 PERIODIC SELF TEST
This occurs every 18 hours, 12 minutes and 16 seconds from power up or from a calibration. The timer is
restarted by a calibration to stagger the self test times so all sensors in a system do not go into self test
simultaneously.
The test is identical to the Push to Test except it is initiated automatically based on elapsed time. The
actual test sequence takes about 30 seconds. During the test, the Status LED blinks green on and off
every 2 seconds to indicate a test is underway.
After 3 seconds, the response is checked.
If the test is successful, the Status LED goes back to steady green. Since the test is intended for
unattended operation, the alarms and voltage/current output are disabled for 15 minutes
to allow the
sensor to recover and to prevent alarms due to the test. If an Arjay/Enmet CAP unit is connected to this
sensor, it too ignores the elevated ppm levels due to the test for 15 minutes. NOTE: the alarms and
voltage/current outputs are only disabled for 15 minutes if the test was successful.
If the response is too low, the Status LED starts blinking red to indicate a sensor fault. If the sensor is
properly seated in its connector, then the sensor should be replaced.
When a sensor fault is detected the 15-minute alarm disable period is aborted. In a sensor fault
condition, if the sensor has been configured for Discrete Voltage Output (DVO) mode then the output
goes to 10V to signal the ISA66RLU panel the sensor fault condition. If analog output mode is selected,
then the output goes to full scale (20mA for current type and 10V for voltage type).
The alarm sensor fault condition will continue until either the next successful self-test (either Push to Test
or Periodic), or the EC Gold power is turned off then on.