Thermo-Hygrograph
Operating Instructions
Thermo-Hygrograph (252)
Enclosure: Operating Instructions “Drum Recorders“
Thermo-Hygrograph (252)
Operating Instructions
1 General
Thermo-Hygrographs are used to measure and record air
temperature and relative humidity (r.h.). The measured values
are recorded, using drum recorders driven by clockworks.
These rugged and reliable precision products have been
proven over decades of use in business, science and culture
around the world. They are suited for service in industry and
private environments. To take advantage of the high measur-
ing accuracy and to maintain them for many years in service,
please observe our following recommendations.
2
Place of installation
Install the instrument horizontally in a vibration-free location.
Depending on the model, the permissible ambient tempera-
ture varies between -35...+80 °C. The instrument should be
protected against direct heat radiation and conduction. For
outdoor installation, a protection screen against radiation and
precipitation is required.
3
Setting into operation
To open the instrument, gently push down the hood
2
, pull
the locking knob
1
and swing up the hood. At the same time
hold the styrofoam cushion
22
(located under the cover) and
remove it after opening the instrument.
3.1
Removing the transport lock
Loosen the recording arm‘s transport lock
4
by turning it on the
lifting rod
7
by about 90°. Remove the cardboard wedge at the
switch-off lever
3
and save it. Carefully remove the protective
cap from the felt-tipped pen
5
and save it.
3.2
Mounting the humidity measuring
element
Take the humidity measuring element N out of its separate
packing. Put the measuring element‘s mount
8
provided with
two bore holes into the upper hooks. Put the lower mount
9
into the lower hook. At the same time lift the recording arm
10
;
regenerate the humidity measuring element N as described
under 6. The humidity measuring element K is already mount-
ed and is maintenance-free.
