Lamtec LT3-F User Manual

52
7 Maintenance
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
=6mm). The corre-
sponding 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.
CAUTION!
With the usage of CO containing test gases C, these must be removed from the test gas outlet
e.g. by the exhaust hose.
4. Calibration/probe testing:
According to table 4, LS2 is to be tested within 2 steps while KS1/KS1D in 3 steps.
a) Offset testing/calibration
Compare oxygen values of probe and test gas A.
Should the deviation of oxygen value be less than or equal to 0.2 vol.% of 21 vol.%,
the probe is fine.
Should the deviation of oxygen value be more than 0.2 vol.%, the probe must be cal-
ibrated according to the manual.
b) O
2
testing/calibration
Compare oxygen values of probe and test gas B.
Should the deviation of oxygen value be less than or equal to 0.1 vol.% of 3 vol.%, the
probe is fine.
Should the deviation of oxygen value be more than 0.1 vol.%, the probe must be cal-
ibrated according to the manual.
c) CO/H
2
testing/calibration
If the probe reacts to an increase in probe voltage on test gas C, then the probe is fine.
If the probe does not react, it has to be changed.
Compare CO value of the probe and CO
e
-value of test gas C.
If CO
e
value of the probe lies between 275 … 375 ppm, the estimation of CO
e
value
is fine. Otherwise, calibrate a more precise estimation of the probe according to the
manual. calibrate on 300ppm.
NOTICE
CO/H
2
calibration with test gas C has the advantage of determining and compensating the
long term drift of sensitivity. The sensitivity of the CO/H
2
electrode usually increases over time
 safe direction!

Lamtec LT3-F Specifications

General

Brand	Lamtec
Model	LT3-F
Category	Transmitter
Language	English