Service documentation series KB/KBF
BB / JTU 25.06.2000
Chapter 3
Calibration
Binder controllers can be adjusted by the customer to suit his particular operating conditions, i.e. the
controller has a calibration mode which, for example, can be used to match the temperature in the
chamber to the one shown on the controller‘s display.
Binder calibrates each chamber before it is dispatched to the customer. High-quality measuring
systems are used for this, whose accuracy is tested annually. However, if the measured temperature
does not match the displayed temperature, please follow the instructions below.
Tolerance of the adjustment
When is it worth to correct a deviation between the value measured and the value displayed on the
controller?
The following table gives you the conditions for an ideal adjustment of a temperature deviation,
Binder unit
designation
Measured value Measured range Adjustment if deviation
is higher than:
KB, KBW Temperature 0 up to 99,9°C 0,3K
KBF, KBWF Temperature
Humidity
0 up to 100°C
10 up to 90% r.H.
0,3K
1,5% r.H.
Deviations which lies within this statements do not require an adjustment.
Important:
The values on the above chart can only be used if the value of measurement uncertainty on the
calibration certificate of the measuring instrument is smaller than the values of the chart.
When this is not the case, then you must take as limit value for an adjustment the
measurement uncertainty value of the calibration certificate.
Adjustment of the working set point. One and Two points adjustment.
Ideally the adjustment should be made to the customer’s most used set points.
Example:
the customer works at 37°C, adjustment of the controller at 37°C.
If the customer uses different set points, the following instructions have to be taken in consideration:
When the difference of temperature between the most used set points is small:
Choose an adjustment value lying between this temperatures.
Example :
The customer ‘s set points are 40 and 60°C, adjustment of the controller at 50°C.
When the controller gives the possibility of a two points adjustment
:
The smaller and the higher working set points will be choose for the adjustment.
Example
: The customer‘s set points are 40 and 60°C, adjustment of the controller at 40°C and 60°C.
Adjustment over the complete range of temperature on a controller allowing one-point
adjustment
If the customer uses the complete range of temperature, but the controller only allows a one-point
adjustment the adjustment will be done on the middle point. The following list gives the optimal values
for a one-point adjustment.
Type of chamber type of controller Optimal adjustment
with
Company
standard
KB, KBW RD2 50°C 37°C
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