Operating Instruction
Q5.25.45
TLT
Page
10 / 18
Draft created/changed: 31.01.03/TT
Document created/changed: 03.08.2012 / Rea
Revision: -
Revision: -
Draft released: 18.02.03/DEL
Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
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O
O
u
u
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s
s
i
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d
e
e
m
m
e
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a
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For the outside measurements, use the same cables as for the duct measurements. The probe does not neces-
sarily have to be installed inside the duct, but can also be secured by means of a pipe clip to the outside wall of
the building. This application is used to detect the outside conditions, for example for the enthalpy. So that the
probe is not exposed to all weathers, a cover should be fitted over it.
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6
S
S
T
T
A
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R
R
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U
U
P
P
Before you start the system, check the correct supply wiring and the configuration of the analogue outputs (U/I
switch). Close the cover of the HTT-V before the power supply is switched on. Check the fuse protection on the
power supply in accordance with the current local regulations. Voltages above +35VDC lead to destruction of the
measuring instrument! The HTT-V is calibrated to a basic accuracy of +/- 2.5 - 3.0 % HR. (/- 1.5 % HR
with factory certificate). After switching-on the power supply, an automatic start-up occurs *S TST*. On the top
line of the display the current software version is shown for 2 seconds. After that the measurement starts immedi-
ately and the current relative humidity and temperature is displayed. In case of faults of the hard- or software, the
system alerts „ERROR” and shows an error-code. The device has an online monitoring, which reports error im-
mediately. The analogue outputs are protected against short circuit, but not protected against external supply.
Outside wall
Cover
Probe
Pipe Clip
