Lamtec LT3, Quick Reference

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42
5 Maintenance
Recommendation:
To check the O
2
electrode, use a test gas with 3 vol. % O
2
in N
2
.
NOTICE
It is not possible to calibrate the CO/H
2
electrode using hydrogen free test gas containing CO.
Recommendation:
To check the CO/H
2
, use a test gas with 100 ppm H
2
, 200 ppm CO, and 3 % O
2
in N
2
.
Calibrate to 300 ppm.
Test probe
1. Install probe:
Push probe into the testing device until stop.
2. Heat up probe:
A cold probe should be heated up for at least 45 minutes in the installed condition. Should
an already heated up probe be installed in the testing device, then wait for 15 minutes.
CAUTION!
The testing device with plugged in heated probe would get hot.
Risk of burning!
3. Test gas function:
The test gas connection would be connected to the pressure reducer or the compressed
air supply of the test gas bottle using hose or hose clamp (D
i
=4; D
a
=6 mm (0.236" in)). The
corresponding test gas is to be given up with 2

1 bar (pressure behind the bottle pressure
reducer). After 2 minutes, the probe calibration and testing can take place.
NOTICE
For test gas usage of 2 bar, test gas pressure lies at 1.6 l/min and increases at 0.6 l/min per
bar increase in pressure.
WARNING!
Risk of poisoning by carbon monoxide!
Carbon monoxide is a poisonous gas. Inhalation can cause severe poisoning symptoms an
can be fatal.

Perform the calibration quickly and only in open, well-ventilated rooms, ideally underneath
an exhaust hood.

Do not open the valve on the test gas cylinder until shortly before calibration and close it
immediately after calibration!
4. Calibration/probe testing:
According to table 4, LS2 is to be tested within 2 steps while KS1/KS1D in 3 steps.