360012-1/H
4 Calibrating the digital thermometer
Refer to the policy for your organization to determine how much
variance is acceptable. If the variance is within acceptable limits
for your organization, you may not need to change the setting.
You must have a thermometer to complete this procedure. The
thermometer must be independent of the digital thermometer,
and be calibrated and traceable according to the policy of the
National Institute of Standards and Technology (NIST), or to
the equivalent national or international measuring equipment
standards as identied in regulations for your organization.
To measure the temperature
1 Place the independent thermometer in the water chamber so
the tips of both thermometers are at the same depth.
2 Allow the temperature readings to stabilize.
3 Compare the reading of the digital thermometer to that of the
independent thermometer. If the difference is greater than
the acceptable tolerance for your organization, calibrate the
digital thermometer.
To calibrate the digital thermometer
1 Remove the back cover of the digital
thermometer by prying the back plate
off the housing.
2 Using a at-head screwdriver, turn
the calibration adjustment dial
slightly to change the readout value.
► To increase the value, turn the
dial clockwise.
► To decrease the value, turn the
dial counter-clockwise.
3 Allow the temperature readings
to stabilize for 15 to 30 seconds.
This will also allow the calibration
changes to take effect.
4 Repeat steps 1 to 3 as necessary until
the readout is acceptable.
5 Install the back cover by aligning the
mounting buttons with the holes on the housing, then pressing
the buttons into the holes.
Digital Thermometer Manual
DT1 Version B
Model DT1
S/N
1 Recordingidenticationinformation
For easy reference, write the model and serial number on this
manual. Both the model and serial numbers are needed to
provide efcient service.
DT 1
000000
Digital Thermometer
Noblesville, IN USA
www.helmerinc.com
REF
SN
2009
A
B
C
D
E
Product Specication label (sample)
Label Description
A Model
B Serial number (S/N)
C WEEE symbol. For more information, see
Section 8, “Technical specications.”
D Date of manufacturing
E CE symbol. For more information, see Section 8,
“Technical specications.”
Congratulations on your purchase of a Helmer DT1 solar-powered digital thermometer. The digital thermometer has been designed for use with
the Helmer QuickThaw™ Plasma Thawing System.
3 Using the digital thermometer
The stainless steel probe on the DT1 immerses in the water
in the chamber, and the display shows the temperature in
increments of 0.1 °C. For the display to work, there must be
enough light in the work area (at least 35 Lux).
When the digital thermometer is rst exposed to light, the
message “---oE” is displayed for about 12 to 15 seconds while
the thermometer initializes.
1 Using a cleaner suitable for
stainless steel, clean the top section
of your Helmer thawer. Do not use
a cleaner that leaves a slippery lm
on the surface, which will prevent
the hook and loop fastener from
adhering.
2 Peel the
liner off
the hook
and loop
fastener to
expose the
adhesive.
3 Carefully insert the probe of the
digital thermometer through the
holes in the brackets in the thawer.
Align the digital thermometer
as desired, then press it onto the
surface of the thawer to adhere it in
place.
2 Installing the digital thermometer
