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1
Description
The
HUBER
handheld pressure gauge
HM28 is a digital pressure measuring
instrument with integrated pressure sensor
for the measurement of differential, relative or
absolute pressures and vacuum. Its versatile
range of functions and high precision render it
suitable for a wide range of applications.
Configuration possibilities:
•
Autom. cut-out, selectable time
•
Selectable resolution and damping
•
Selectable units of time
•
Selectable units of measurement
•
General reset to standard setting
•
Selectable data transfer rate
•
Configuration logging facility
•
Selectable measuring intervals
2
Safety details
The pressure values stated on the rating plate
and mentioned in these operating instructions
must not be exceeded or the pressure sensor
can be destroyed.
The instrument is not to be used in
an explosive environment!
Wear eye protection for pres-
sures > 1bar!
3
Operating
3.1
Switching on and off
Switching on Press the ON key (the maxi-
mum permissible measuring
range and the class appears
on the display).
For precision measurements
the instrument must be switch-
ed on for at least 1 minute
(warm-up phase).
Switching off Press the OFF key, or auto-
matic cut-out 1,10 or 60 min
after the last keystroke.
In the case of a temperature change the
instrument requires at least 30 minutes to
adjust to the new ambient temperature.
3.2
Pneumatic connection
For measuring ranges up to 7000 mbar, 4/6
mm or NPT 1/8" connectors can be connected
depending on model. Higher ranges are
equipped with NPT 1/8".
Ensure correct connection of the pneumatic
hoses!
+P
high pressure
S-
low pressure
with the absolute and relative
pressure version)
When screwing on a coupling it
is important to turn with a span-
ner in the opposite direction.
Never hold at case only!
3.3
Operating modes
The modes in the table below can be selected
in succession by pressing the MODE key.
After switching on the instrument is in the
mode normal always.
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