Bibby Sterilin Stuart SMP40, Instructions For Use Manual

Page: 35 / 44

10.3.1 Current Calibration Factor
The instrument’s displayed temperature value is calculated using the instrument’s platinum resistance
temperature sensor data and the current calibration equation data.
Displayed Block Temperature = ax
2
+ bx + c
(where x = Instrument’s PRT Temperature Value)
The values of a, b and c in the calibration equation are calculated by performing a quadratic regression
through zero on the melting point data that is entered during an instrument calibration procedure.
The displayed calibration factor is equal to the value of b in the determined calibration
equation.
A technical note that gives a complete description of the instrument’s calibration calculations can be
found on the Stuart Equipment website: T07_001A_The_SMP40s_Calibration_Calculations.pdf
10.3.2 Calibration Procedure
The SMP40 allows the user to perform either a single or dual point calibration by using the following
procedure.
1 Using a suitable certified reference material,
perform a melt determination as described in
section 7.
2 If a dual point calibration is required, perform
a second melt determination on a certified
reference material with a different melting
point to that used in step 1.
3 If manual events need to be added to a result
file, they should be added using the steps
described on page 22 before starting the
recalibration procedure below.
4 In the Settings and Calibration screen select
the Manage device calibration section of the
screen.
5 In the Calibration screen press the “Calibrate
this device” button on the Command toolbar.
6 The Set Calibrated Values screen is used to
select the result files that will be used to
calibrate the instrument.
7 Select the first result to be used by pressing the
“Choose Result” field next to Value 1.
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