4
RH25
‐
EU
‐
EN
v1.0
5/13
Selecting
o
C/
o
F
units
of
measure
With
the
meter
OFF,
press
and
hold
the
POWER
and
MODE
buttons
simultaneously
until
the
unit
of
measure
appears
on
the
lower
right
corner
of
the
LCD.
Use
the
MODE
button
to
select
the
desired
unit
of
measure
(
o
C
or
o
F).
Press
POWER
twice
to
step
past
the
alarm
settings
until
the
normal
measurement
mode
is
displayed.
High
Alarm
for
Heat
Index
and
Wet
Bulb
Globe
temperature
1.
With
the
meter
OFF,
press
and
hold
the
POWER
and
MODE
buttons
simultaneously
until
the
temperature
unit
‘C’
or
‘F’
appears
on
the
lower
right
corner
of
the
LCD
(if
desired,
use
the
MODE
button
to
select
the
desired
unit
of
measure).
2.
Press
the
POWER
button
to
step
to
the
Heat
Index
(HI)
Alarm
ON/OFF
display.
3.
Use
the
MODE
button
to
select
ON
(A
‐
on)
or
OFF
(A
‐
oF);
see
display
examples
below:
4.
Press
POWER
to
step
to
the
Heat
Index
temperature
Alarm
limit
value.
See
example
below:
5.
Press
the
MODE
button
momentarily
to
change
the
value
in
small
steps.
Press
and
hold
the
MODE
button
to
scroll
quickly.
6.
When
the
desired
Heat
Temperature
alarm
limit
is
displayed,
press
the
POWER
button
to
continue
to
the
Wet
Bulb
Globe
temperature
Alarm
programming
screens.
7.
Repeat
steps
3
‐
6
to
program
the
Wet
Bulb
Globe
temperature
ON/OFF
and
Alarm
limits.
Use
the
POWER
button
when
done
to
step
back
to
the
normal
operating
mode.
8.
The
default
settings
are
27.8
o
C
(82.0
o
F)
for
Heat
Index
temperature
alarm
limits
and
28.0
o
C
(82.4
o
F)
for
Wet
Bulb
Globe
temperature
alarm
limits
9.
When
either
alarm
limit
is
exceeded,
the
meter
continuously
beeps.
To
determine
which
alarm
is
sounding,
check
the
HI
(Heat
Index)
and
WB/HI
(Wet
Bulb
Globe)
temperature
displays
to
see
which
unit
of
measure
is
blinking,
that
will
indicate
the
tripped
alarm.
10.
To
silence
an
alarm
the
user
must
either
switch
the
alarm
OFF
or
change
its
alarm
limit
value.
Error
Message
Displays
E
‐
2:
Humidity
Sensor
failure.
Replace
unit.
E
‐
3:
Temperature
Sensor
failure.
Replace
unit.
E
‐
4:
Temperature
over
‐
range;
E
‐
5:
Temperature
under
‐
range
E
‐
6:
Hardware
failure.
Replace
unit
