Calibration Instruction
1 Calibration Instruction for Salwico ST400 H2S
5103028_Salwico ST400 H2S_Calibration Instruction_I0_EN_2019_C
1
1 Calibration Instruction for Salwico ST400
H2S
1.1 Preliminaries
This instructions applies to the following products:
Figure 1. Salwico ST400 H2S, 0-30 ppm 4-20 mA. Part no. 4462
The H
2
S sensor is Electrochemical and measures H
2
S content by means of
chemical reaction.
DANGER!
H
2
S – Hydrogen Sulphide – is toxic and dangerous also in rather low concentrations.
H
2
S is a sticky gas and smells very distinctly from rotten eggs.
Consilium Replacement article number for ST400 H
2
S detectors is no.
004462-S
.
A new sensor is supplied without the metal housing and must be fitted in the
housing. This applies to both H
2
S and O
2
sensors of ST400 type.
Calibration equipment
Normal measuring range is 0-30 ppm, our standard calibration bottle no.
5201005-00A
contains 20 ppm of gas in air.
For SW2020 a mix-bottle is often used, with H
2
S 20 ppm as well as N
2
99% and
C
3
H
8
50% LEL, article no.
5201010-01A
.
Test points (
A
) for the multi-meter as well as “SPAN” (
B
) and “ZERO” (
C
)
potentiometers are indicated below.
CAUTION!
Do not adjust the other potentiometers.
