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1. Specification
1.3 Functional principle
The dew-point indicator shows exhaust gas build-up. Exhaust gas that has
been built up is characterised by an increased humidity and temperature
relative to the ambient air. A possibly likewise presence of CO content has a
strong toxic effect, which is why exhaust gas build-up can be highly dange-
rous.
To provide a sure detection, the measurement is effected via two indepen-
dent sensors:
1. measurement of the surface resistance of the sensor plate
2. measurement of the temperature
When a pre-determined resistance of the sensor plate is undercut, an optical
and an acoustic signal is emitted.
The increased temperature of the outflowing exhaust gas is recognised by
the fast-reacting temperature sensor, which is located in a protective position
in a hole at the end of the sensor plate.
For to adapt to the different ambient conditions, the operator can adjust the
sensitivity in four different steps. In order for to attain a high battery life ser-
viceability, the instrument switches off automatically after four minutes.
1.4 Specifications
Temperature measuring range: -40 to 100°C
Resolution:
Accuracy:
Indicators:
Setting of the sensitivity:
Automatic switch-off:
Power supply:
Operational life:
Sensor plate:
Wöhler TI 410 Dew-point Indicator
0.1 °C
E 1.0 °C
1. acoustic through pulsed alarm tone
2. optical though four-step bar
3. increased temperature indication relative to
the surroundings
in four steps
after four minutes
9 V block battery (indication if battery voltage
is too weak
about 100 hours
double-sided
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