shelolab SM10HP-2, Installation And Operation Manual

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OPERATION (CONTINUED)
T
EMPERATURE
A
CCURACY
V
ERIFICATION
Note: Performing an accuracy verification of the temperature display requires a temperature
reference device. Please see the Reference Sensor Devices entry on page 11 for device
requirements.
Optional : A verification of the temperature display accuracy may be carried out when preparing the
oven for use, if required by your production or laboratory protocol. The verification compares the
displayed temperature of the oven chamber with the actual temperature of the chamber air as
provided by a reference sensor device.
If a difference between the actual and displayed temperatures is
discovered, perform a temperature calibration. Please see the
Calibrate
Temperature Display procedure on page 36 in the User Maintenance
section.
Vents
The intake and exhaust vents must be closed in order to perform an
accurate temperature verification. Chamber temperature uniformity and
stability are too disrupted when operating with the vents open to verify the
accuracy of the oven temperature display.
Probes
A reference device sensing probe may be introduced through the through
the chamber door space. Use heat-resistant, non-marking tape to secure
the wires and probe heads, and seal any gaps in the door space. The door
must close and latch fully.
Place the sensor probe of the temperature reference device as close as
possible to the geometric center of the oven chamber. A thermocouple
sensor probe sleeve may be taped to the shelving, as long as the exposed
copper end is 2 inches (5cm) away from the shelf (see Figure 10). An
exposed sensor probe in direct contact with the shelving may experience
heat sinking, which can result in an inaccurate temperature reading.
Pre-Heating
For best accuracy, set the oven temperature set point to that of your application. If you will be
running a multi-set point heating profile, set the oven to run at the average temperature of your
profile. Let the oven heat to the constant temperature set point and run for at least 1 hour
undisturbed in order to stabilize.
Temperature Stability
The oven chamber is thermally stabilized when no fluctuations of ±0.2

C or greater have been
detected with the verification reference device for a minimum of 30 minutes . Failure to wait for
stabilization will result in a failure to verify the accuracy of the oven temperature display reading.
Figure 9: Damper
in Closed Position
Figure 10: Probe End
2 inches (5cm) From
Shelf Surface