Submittal Sheet

Danfoss
60-413.12
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84
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Data sheet | Thermostat, MBC 8000 and MBC 8100
4 | 520B7816 | IC.PD.P10.D8.02
Net weight: 0.25 Net weight: 0.27
Dimensions [mm]
and weights [kg]
Rigid sensor
Cap. tube version
Fig. 1
Example
A MBC 8100 with capillary tube length 2 m and
range 50 – 100 °C must cut out at 75 °C in 70 °C
ambient temperature. At which cut out
temperature should this temperature control be
set at in 20 °C ambient temperature?
Regulation
range
[°C]
Correction factor a for
thermostats
with rigid
sensor
with 2 and 5 m
capillary tube
-10 – 30 – 1.1
20 – 50 1.0 1.4
50 – 100 1.5 2.2
70 – 120 1.7 2.4
60 – 150 – 3.7
The relative setting Z can be calculated from the
following formula:
Setting value min. range
x 100%
max. range - min. range
Relative setting: 75 - 50
x 100 = 50%
100 - 50
Relative setting:
Factor for setting point deviation Z (g. 1).
Z - 1.2
Correction factor a (table under g. 1) a = 2.2
Setting point correction Z x a = 1.2. x 2.2 = 2.6 °C
The MBC must be set at 75 + 2.6 = 77.6 °C in
20 °C ambient temperature in order to cut out
at 75 °C ambient temperature.
Setting point correction The sensor on MBC 8100 thermostat contains
an adsorption charge. Therefore its function
is not aected whether the sensor is placed
warmer or colder than the remaining part of
the thermostatic element (bellows and capillary
tube). However, such a charge is to some extent
sensitive to changes in the temperature of
the bellows and capillary tube. Under normal
conditions this is of no importance, but if the
thermostat is to be used in extreme ambient
temperatures the setting point might change.
The deviation can be compensated for as follows:
Setting point correction = Z x a
Z can be found from g. 1, while a is the
correction factor from the table below.
Factor for setting
point deviation
Relative
scale
setting
in [%]
© Danfoss | DCS (jmn) | 2017.02