testo 845 Bedienungsanleitung Seite 44

44 8. Measuring
Observe minimum penetration depth for immersion / penetration probes:
10 x probe diameter
Avoid applications in aggressive acids or alkalis.
Do not make measurements on sharp edges with cross-band surface probes.
Display:
1. Max. value, 2. IR temperature, 3. Min. value
3
IR m m easurement a a nd h h umidity m m odule ( (
Measurement menu only active when humidity probe is plugged in.
Select the desired display mode with
Display:1. Humidity, 2. IR-Temperature, 3. Dewpoint
4
Temperature a a nd h h umidity m m odule ( (
Measurement menu only active when humidity probe is plugged in.
Select the desired display mode with
Display:1. Humidity, 2. IR-Temperature, 3. Dewpoint
5
Dewpoint d d istance ( (
Measurement menu only active when humidity probe is plugged in.
Display of dewpoint distance incl. max. and min. values.
Select the desired display mode with
Display:1. Max. value, 2. Dewpoint distance, 3. Min. value
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Surface m m oisture
Walls and ceilings in danger of mould can be localized based on the surface
moisture. The surface moisture is measured from 0 to 1.0 (0 = dry, 1 = very
damp). According to DIN EN ISO 13788, the danger of mould on surfaces
exists if the moisture level rises above 0.8 over several days. The testo 845
calculates the surface moisture from the surface temperature (IR) and the
dewpoint of the air.
Measurement menu only active when humidity probe is plugged in.
Display of surface moisture incl. max. and min. values.
Select the desired display mode with
Display:1. Max value, 2. Calculated surface moisture, 3. Min. value
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