ATI Series D12 Toxic Gas Transmitter with H10 Smart Sensor
Revision N (7/15) 43
Auto-test
The Auto-test option verifies the serviceability of the transmitter on a prescribed schedule by exposing
the sensor to a small amount of gas, and verifying a minimum response. Three attempts per test are
made, and if the sensor does not respond on the third attempt, a fault alarm is triggered (may be
optionally disabled). A summary of pass, fail, and retry counts are maintained in the sensor memory,
and may be viewed on the Auto-test History page.
The test is performed at a specific time of day, and may be scheduled to repeat every 1 to 14 days. The
date and time of the next test is available for editing, and the test may be triggered manually at any
time, without affecting the preset schedule.
During startup, the transmitter examines the date and time of the next scheduled Auto-test. If the
scheduled time and date has past, or if it is scheduled to occur within the next 24 hours, the transmitter
moves the date by one day to provide a minimum of 24 hours before the first (or next) test is performed.
This is done to allow sensors an additional “settling time”, and to avoid confusion to installers during
the commissioning period. Set the system clock to local time before scheduling the Auto-test time of
day.
The Auto-test option requires a C18 gas generator, which must be compatible with the installed
sensor’s gas type, and full-scale range.
lists gas compatible generators and sensors. Contact factory for a complete list.
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