SCP SCIENCE DigiPREP, Руководство по обслуживанию

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KeyPad
Version 1.0
SCP SCIENCE
15
temperature to the temperature you wish to use as
your setpoint.
Once the setpoint temperature is reached and
both the keypad value and the reference value (from
the calibrated thermometer) are stable, measure and
record the reference temperature and the keypad
display temperature. (Better accuracy is achieved if
the values are taken from the same tube at the same
time.) The difference between the two values will be
entered into the system. Calculate the input value as
follows:
T
reference
- T
keypad
= input value
Repeat for up to fi ve reference temperatures.
Next, re-access the calibration screen. (You may
have to turn off and back on to access the utilities
screen.) The calibration screen will prompt you to
enter the number of calibration point measured:
Using the number keys, enter a vlue between 0
and 5. (Choosing "0" will clear all calibration data
from the system.) Press enter. The number of points
you select will appear as the title of the next screen.
(This example will use a 1 calibration point.)
Using the numeric keypad, enter the fi
rst
calibration set point value ("SPT") and press enter.
Next, enter the calculated error ("DIFF"): for a positive
value, hold down the right-arrow key until the correct
value is reached. For a negative value, hold down
the left-arrow key until the correct value is reached.
Press enter to save the values and exit the screen.
To return to the factory calibration or
to clear all data from the keypad,
choose the number of calibration
points as "0" and press enter to
make the selection.
SAFETY MESSAGES
During operation, the keypad controller monitors
the system to detect potential problems.
If there is a problem, the alarm will sound and
the controller will display a safety message. The
controller will also suspend control of the block and
the block will begin to cool down. To resume control
of the block, press any key on the keypad.
The timer will continue to count
down during this time.
POSSIBLE SAFETY MESSAGES
Overtemp. Protection – Check Block Temp.
This message will be displayed if the block or
sample temperature overshoots the target
temperature signifi cantly.
Possible Causes:
• Samples were placed in a block that is too hot.
Try allowing the block to cool to near-ambient
temperature before beginning the next
digestion.
• The voltage switch on the back of the block is
set to the wrong position.
• An exothermic reaction occured.
Temperature Dropping – Check Digi
PROBE
This message will be displayed if the sample block
temperature is falling despite the controller attempt-
ing to heat it.
Possible Causes:
• The sample has evaporated.
• Digi
PROBE
is not submerged into the sample
suffi ciently.
1 POINT
SPT 0.0 DIFF +0.0
CALIBRATION
#POINTS 0 (0-5)
NOTE
NOTE