SENSITRON
A Halma Company
MT4811
SMART 3 NC
Quick Guide (EN)
P. 9/10
Testing and use
POWER ON
When the detector is powered on, the red LED on the motherboard starts
blinking at slow intermittence. Output current is nearly 1.5 mA.
After 1 minute, the red LED flash rate is equivalent to the detector working status
and the output current is 4.0mA.
Once the warm-up phase is over, the detector can work correctly, although the
optimal performances will be achieved after two hours.
TESTING
Detectors are factory calibrated for the specific gas required by the customers.
Future adjustment of the preset calibration can be carried out by employing the
calibration keypad.
Testing should be carried out by using a gas mixture in the appropriate range,
along with our calibration kit.
USE
The detector works autonomously and automatically. Once adequately
connected, no further operations are required.
The flashing red LED on the motherboard indicates the detector’s working
condition as detailed in the main manual.
MAINTENANCE
Sensitron racommends a check of permance through a test gas with the proper
calibration kit. If the gas detector is equipped with an electrochemical cell or
a pellistor sensor, the check must be biannual. With an infrared sensor the
performance checking must be annual. If required, during these tests perform
the Zero and Span calibration. Moreover, Sensitron recommends to perform the
same tests when the detector reports a gas reading above an alarm threshold.
Test results should be recorded into a suitable book to be shown to the Authority
in case of inspection. For further information, refer to the kit calibration manual
MT894.
