5
7.0 OPERATION
CAUTION:
EXERCISE CARE WHEN USING ACIDIC OR
CAUSTIC SOLUTIONS AS THEY WILL ATTACK
THEGALVANIZEDSTEELBATHBODYIFSPILLED
INTO THE BATH. IF SPILLS DO OCCUR, THE
BATH LIQUID SHOULD BE IMMEDIATELY
DRAINED AND THE UNIT THOROUGHLY
FLUSHED.SPILLSANDCONDENSATIONSHOULD
BE CLEANED/REMOVED FROM ALL METAL
SURFACES AFTER EACH USE.
7.01 When filling the bath with water, allowance
must be made for the displacement of water
upon immersion of samples. The maximum
liquid level is 1 inch below the top of the pan.
7.02 To conserve energy, reduce evaporation,
increase temperature control accuracy, and
reach/maintain 100° C, use the gable cover
provided. Do not use aluminum foil as a
cover, as it may cause corrosion due to an
electrochemical reaction.
1. Add distilled water to bath. The water level
shouldbenocloserthan1"fromthetopofthe
bath when the bath is fully loaded. NOTE:
Use distilled water only. If deionized is the
only water available, a mixture with 50/50
ratio of deionized and tap water should be
used. Deionized (18 MEG) will damage
metals.
2. Powerup:Depress thepowerswitchlocated
at the lower end of the control panel.
Immediately after turning on power, all of the
segments of the display will be on along with
the HEATER ON indicator. After 3 seconds,
the current set temperature will be displayed
and this will last for 5 seconds. Then the
display will change to the actual bath
temperature.
3. To display the temperature setpoint:
Todisplaythesettemperature,quicklypress
the /\ (up) or \/ (down) key. The current set
temperaturewillbedisplayed.After5seconds,
the display will return to the actual bath
temperature.
4. To change the temperature setpoint:
Tochangethesettemperature,continuously
press the /\ or \/ key until the desired set
temperatureisdisplayed. Whencontinuously
pressing either the /\ or \/ keys, the display
will change slowly at first but after 1 degree
has passed the display will begin to change
rapidly. Withalittlepractice,onewillbecome
accustomed to this. After the desired set
temperature is achieved, then press the
ENTER key. The display with the new set
temperature will flash three times and then it
will return to the bath temperature.
If the ENTER key is NOT pressed, the
expected new set temperature will not be
acceptedandthewaterbathwillcontrolatthe
previous set temperature.
5. To calibrate the water bath:
The water baths are calibrated at the factory
for use over a wide range of temperatures.
Duetonon-linearitiesinthecontrolsystem,it
maybenecessarytomakethedisplaymatch
a calibrated thermometer's reading, even
though the difference might be only a few
tenth's of a degree.
Thecalibratefunctionshouldbe usedonlyto
match a STABLE bath's actual temperature
to the calibrated thermometer.
Toperformcalibration,presstheCALIBRATE
key. The display will change to CAL, then
flash back to bath temperature. This will
occurfourtimes,ifnootherkeys,arepressed,
then it will resume displaying the bath
temperature.
After inserting a calibrated thermometer into
theholderandlettingitstabilizeforaminimum
of 15 minutes, note its reading.
Press the CALIBRATE key once again and
while the display is flashing, press either the
/\ or \/ key to make the display match the
notedthermometerreading. Afterthesatisfied
display is achieved, press the ENTER key.
The display will flash three times with the
adjustedreadingandthenstopflashing. The
bath is now calibrated more accurately for
that control set point.
