MT4299E Rev.1
15/10/2019
Pagina 12 di 55
Adjustments are required whenever either Fault or unjustified Alarms due to environmental
conditions occur (Zero adjustment) or detectors need modifying their response to gas (Span
adjustment).
Span adjustment requires a calibrated gas cylinder, either filled with the same gas the detector
has been calibrated for or a reference gas advised by the manufacturer
For the Zero adjustment, gas detectors are to be in fresh air (without any gas or interfering
compounds) and powered on since 8 hours at least.
Once the routine is over a test with gas is to be made to verify the right working condition.
KEYPAD
