Dickson TH550 Manuale operativo - Pagina 4
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Calibration, Ctd.
4. To lower the humidity or dew
point
reading,
press the
"RH/Dew" key.
To raise the
humidity or dew point reading,
press the
"Min/Max" key.
5. To lower the temperature read-
ing, press the
"Hold" key.
To
raise the
temperature
reading,
press the
"
0
C/°F"
key.
6.
When
calibration
is
complete,
simply
turn the unit off
to exit
the
calibration
mode.
Temperature
Down
Notes:
This procedure allows for a
I 0 digit change in readings
.
If
greater change is
required,
there is
either
a need for factory seNice or
the standard being used is inaccu-
rate.
For most
accurate
full
scale
calibra-
tion,
factory
seNice
is recommend-
ed.
Temperature
Up
Keypad Functions in Calibration Mode
a
Troubleshooting
Problem
Inaccurate
Reading
Disp lay won't
change.
"E"
appears
in
display
Display fading
"Err"
appears
LO BAT symbol
appears
Probe
exposed
to
environments
exceeding
95%
RH
for
extended
period
Parts List
Solution
Allow
indicator to stabilize.
Check battery power
ILO BAT)
.
Incorrect reference
being used
.
Out
of ca
libration
.
Check manual
fo
r
calibration procedure.
Unit in
"HOLD" mode
(press
HOLD again) or
is
locked up (Turn indicator
OFF,
remove
battery,
re-install
battery &
turn
ON)
Component failure.
Contact
factory.
Weak
battery.
Change
battery.
Bad cord connection
or
out
of range.
Pull rubber
boots
off
wand
and
unit. ch eck
for
proper con
nections
.
Check to
see
that
environm ent measured
is
within
operating
range
of unit---<:heck
manual
p.2-
ambient operating conditions.
Replace
battery
Probe
sh ould
be
dried out
under
normal
ambient conditio ns-
Time
required
varies
on temperature. RH & air
flow
Some parts are easily
replaced
on
site.
Please
refer
to table
below.
Description
Part#
Accessories
Calibration
Kit
(11
%
and 75%1
AB34
NIST
Traceable Certificate,
3-
oint*
N3TH5
NIS
T
Traceable Certificate, ULTIMA*
N4TH5
*Must
be
requested when ordering.
add one weeK
to delivery
time.
a