Sensitron SMART3G, Дополнение

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ENGLISH
Pag. 15
3.1 Forewords
The routines described here after allow adjusting the Zero, Span, 4-20mA output and alarm
thresholds values on the SMART3G.
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). Have the detectors connected to the control panel or PLC before adjusting the
4-20mA output values.
The menu password is 1234, but if the user wants to modify the alarm thresholds and hyste-
resis value he has to use the password 5345.
Span adjustment requires a calibrated gas cylinder, either filled with the same gas the detec-
tor has been calibrated for or a reference gas advised by the manufacturer (e.g. Methane to
adjust a detector calibrated for Ethyl Alcohol or Butane for an LPG detector).
The ZM.CAP calibration cap is necessary to let the gas flow to the sensor head. These cap,
made of stainless steel, has been designed to inlet the right gas flow to the sensor. It comes
complete with two adapters to make it fit with al of Sensitron’ sensor heads.
Essential requirements to perform correct Zero, Span and 4-20mA adjustment routines are
as follows:
³
Gas detectors are to be in fresh air (without any gas or interfering compounds) and
powered on since 8 hours at least.
³
Once the routine is over a test with gas is to be made to verify the right working con-
dition.
WARNING!
NEXT magnet
EXIT magnet
ENTER magnet
- enter in the main menù
It allows to:
- during value settings, the modifiable digit switches to the
next one
- switch from a sub-menu step to the next one
It allows to:
- browse the main menù voices
- during value settings, the modifiable digit increases
the value by 1
- return from a sub-menu step to the main menu
It allows to:
- exit from main menu
- if an operation causes an error, it allows to return
to the main menu
Figure 4) Description of ENTER, NEXT and EXIT magnets