az-instrument 8708 User manual

8709
Model:
8708
Model:8903/8904/8906
INSTRUCTION MANUAL
PEN TYPE HYGROMETER
8709 KIT

(1) Turn meter on bypressing ON/OFF
button.
(2) Press F/C button to convertreading
to desired range.Bothtemperature
and relative humiditymeasurement
will display simultaneously.(8708)
NORMAL MEASUREMENT
INTRODUCTION
8708
Therm-
Hygrometer
ON/OFF
HOLD
MIN/MAX
TEMP
(F/C)
RESET
td
WB
MIN
MAX
C
F
%HLD
8708
Thermo-
Hygrometer
ON/OFF
HOLD
MIN/MAX
TEMP
(F/C)
RESET
td
WB
MIN
MAX
C
F
%HLD
8709
Therm-
Hygrometer
Congratulation on yourpurchase of
the Pen typeThermo-Hygromter .
This is alow cost buteasy use toget
accurate measurement .
The difference between model 8708
and 8709 isthe latter onefeatures
self-calibration by using0033RH/
0075RH salt solutionto maintain the
meter to geta reading .
The front panelof 8708 withTEMP
(F/C) printing ,instead 8709 without
a button withprinting F/C,CAL .
ccurate
td
WB
MIN
MAX
C
F
%HLD

(1)Power on themeter by pressing
ON/OFF button. You will seea full
display on thescreen ( thoughyou
might have seen"td","WB" shown
on the screen,however these icons
are only availablefor other models)
, then "HLD" icon will disappearin
one second ,thenafter 3 seconds,
the meter willstart measuring the
temperature and humidityand
display both readingsat the same
time.
POWER ON THE METER
(1) Turn meter on bypressing ON/OFF
button.
(2) Use apen tip topress F/C key
whenever you needto.
Press F/C to convert readingto
desired range. Bothtemperature
and relative humiditymeasurement
will display simultaneously.(8709)
READ BEFORE USE
td
WB
MIN
MAX
C
F
%HLD
td
WB
MIN
MAX
C
F
%
C
%

(2) The defaultsetting of temperature
oo
display can bein F or C. You can
press F/C button for 2seconds to
change the temperaturedisplay
from Cto For vice versa. You
may use apen tip topress F/C
button whenever convenient.(8709)
(1) Press andhold MIN/MAX button
until MIN appears on display.
The LCD screenis now showing
the minimum humidityand tem-
perature readings inmemory.
MIN/MAX FUNCTION
2
C
%
F
%
C
%MIN
(2) Press andhold MIN/MAX button
again until MAX appears on
display. The LCD screenis now
showing the maximumhumidity
and temperature readingsin
memory.

MAX
C
%
(3) To return tomeasuring mode of
current temperature andhumidity,
press and holdMIN/MAX button
until MIN or MAX disappears from
the display.
(4) To clear currentMIN and MAX
readings from memory, press and
hold RESET button until thefull
display flashes .Themeter reading
turns to thenormal measurement
with either MIN or MAX icon , after
about 10 second,the MIN/MAX icon
will disappear automatically.
C
%
DATA HOLD FUNCTION
Press hold buttonuntil "HLD" appears
in display. The currentreading is now
being held andwill not changeuntil
Hold function iscancelled. Press
RESET button to cancelHold function.
Hold function canbe used forHumidity
and Temperature .
C
%HLD

AUTO POWER OFF
3
Unit will turnitself off after 20 minutes.
(Sleep mode).To override AutoPower
Off function (Non-Sleep Mode) press
ON/OFF ,MIN/MAX keys simultane-
ously.
After the fulldisplay appears release
ON/OFF button, the displayshows
"n" on thescreen. When "n" appears
then release MIN/MAX button. Unit
will now bein Non-sleep mode.
1. Turn off the meter.
2. Press ON/OFF button. When LCD
displays full readings,press F/C
button with apen tip andthe LCD
shows original temperaturedefault
Cor Fright down thecorner.
3. Press MAX/MIN button to switch
the default Cor F. Press F/C button
to save thenew temperature scale
default and LCDwill first show"S"
then show "%MIN" right upthe corner.
Turn offthe meter.
The procedure iscompleted.
CHANGE DEFAULT OF
TEMPERATURE SCALE
(8709 only)

CHECK AND CALIBRATION
The carrying caseis for notonly
storage (see FIG1)butalso calibra-
tion (see FIG2).
4
C
MIN
%
F
FIG 1
FIG 2
HR 33 MgCl
TEMP
RH%
ooooo
15 C 20 C 25 C 30 C 35 C
33.30 33.07 32.78 32.44 32.05
(8709 only)

NOTE:
A convenient look-uptable has been
built in toaid calibration.
HR 33 MgCl
TEMP
RH%
ooooo
15 C 20 C 25 C 30 C 35 C
33.30 33.07 32.78 32.44 32.05
o
If different temperatures, say 25 C,
o
the RH ofMgCl is 32.78and in 30 C,
the RH is32.44. o
The same referencesays 30 C , the
RH of Naclis 75.09 RH%humidity
o
and in 35 C , theRH is 74.87%.
(See the table)
HR75 NaCl
TEMP
RH%
ooooo
15 C 20 C 25 C 30 C 35 C
75.61 75.47 75.29 75.09 74.87
The relations arerecorded in thelook
-up table.
Once the calibrationmode in ON, the
meter will searchthe right humidity
value according tothe current temp-
erature to getmore accurate calibra-
tion.
Before checking thehumidity 33% or
75% , makesure you purchasedmodel
8709 and saltsolution 33% (dark
brown bottle) ,75% ( bluebottle ) as
well as thecarry case, ifyou purchased
model 8708 ,it is themodel not avail-
able for checkingor re-calibration .

1.1. CHECK HUMIDITY 33%
1.1.1. Turn on the meter. Plug unit
in 33% saltreference bottle and
put unit intothe carrying caseas
shown FIG2. Checkthe reading
on LCD after40 minutes. Ifthe
display reads between31.5% and
34.5%, that meansthe meter is
accurate. Otherwise, itneeds
to be recalibrated.
Please calibrate themeter by
following calibration instruction
1.3.A.
1.2.CHECK HUMIDITY 75%
1.2.1. Turn on the meter.Plugunit
in 75% saltreference bottle asyou
do in step1.1.1.Check the reading
on the LCDafter 40 minutes. If the
display reads between73.5% and
76.5%, that meansthe meter is
accurate. Otherwise, itneeds to
be calibrated. Pleasecalibrate the
meter by followingcalibration
instruction 1.3.B
(8709 only)
1.3.CALIBRATION
A. CALIBRATION FOR
RELATIVE HUMIDITY 33%
1. Turn off the meter.
2. Press ON/OFF button. When LCD
displays full readings,press F/C
button after pluggingthe meter in
the 33% saltreference bottle for 40
minutes(you have donein 1.a).
3. Press RESET button and theLCD
shows " %MIN ".

4. Press F/C button to savethe cali-
bration value of33%. The LCD
shows "S" for 2seconds and then
the "%MAX" shows rightup the
corner of LCD.
5. Turn off the meter. Thecalibration
of 33% iscompleted.
5
MIN
%
MAX
%
B .CALIBRATION FOR
RELATIVE HUMIDITY 75%
1. Turn off the meter.
2. Press ON/OFF button. When LCD
displays full readings,press F/C
button after pluggingthe meter in
the 75% saltreference bottle for 40
minutes.( you havedone in 1.2.1)
3. Press RESET button twice andthe
LCD shows "%MAX" .