Calibration Instruction 1Calibration Instruction for Salwico ST400 O2
5103029_Salwico ST400 O2_Calibration Instruction_I0_EN_2014_B
3
6 You will get a confirmation message that
the detector has been disabled.
Press Close to continue.
7
NOTE!
For the following steps in the zero
calibration instruction proceed to
the Salwico ST400 detector.
1.3 Calibrating the sensor (Span calibration)
Hint!
A typical sign for when lifespan of the O
2
sensor is up is drifting values, instable
readings and inability to set the 17.4 mA signal even with the SPAN potentiometer
in max position.
1 Connect a Multi-meter (set to mA) to the
test points and adjust the readout on the
“SPAN” pot to 17.4 mA when normal
breathing air is present.
1.4 Calibrating the sensor (Zero calibration)
For Zero adjustment a Nitrogen mix should be used, with a pure N
2
/Nitrogen
concentration.
A gas bottle with Hydrocarbons in N
2
can also be used, as long as the O
2
content is
zero per cent.
We recommend the Consilium article no. 5201006-00A with 100% N
2
.
1 Connect a Multi-meter (set to mA) to the
test points.
2 Connect the gas bottle and open the
regulator valve.
3 Wait for the mA signal to drop and
stabilize.
Adjust the reading with the “ZERO”
potentiometer to 4.0 mA.