Calibration Instruction
1 Calibration Instruction for Salwico ST400 H2S
5103028_Salwico ST400 H2S_Calibration Instruction_I0_EN_2019_C
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 (Zero calibration)
1
Connect the Multi-meter (set to mA) as
shown in the picture.
2
Adjust with the “ZERO” potentiometer to
4,0 mA signal output.
1.4 Calibrating the sensor (Span calibration)
Verification of detector type 0-25 ppm or 0-30 ppm
NOTE!
The ST400 for H
2
S is available in two types.
Type 1: 0-25 PPM. mA-signal at 20 ppm = 16.8 mA.
Type 2: 0-30 PPM. mA-signal at 20 ppm = 14.6 mA.
To verify which type is in use, make a span calibration as below and verify the
display reading in the central cabinet.
•
If the readout at 14.6 mA is less than 20 PPM a calibration with 16.8 mA
set-point must be done.
