S+S Regeltechnik TF65 Notice D'instruction page 7

G
General notes
In order to avoid damages ⁄ errors, preferably shielded cables are to be used.
Laying measuring cables parallel with current-carrying cables must in any case be avoided. EMC directives shall be observed!
These instruments must be installed by authorised specialists only!
Note!
Select immersion depth for built-in sensors so that the error caused
by heat dissipation stays within the admissible error margins.
A standard value is: 10 x diameter of protection tube + sensor length.
In connection with housing-type sensors, particularly with outdoor
sensors, please consider the influence of thermal radiation.
If the sensor is used in refrigeration circuits, it must be insulated
together with the housing to reduce the temperature potential between
the device and the medium to a minimum and thus prevent condensation
damage.
Maximum thermal load on components:
On principle, all temperature sensors shall be protected against
unacceptable overheating!
Standard values for individual components and materials selected are
shown for operation under
neutral atmos phere and otherwise normal conditions
(see table to the right).
For combinations of different insulating materials,
the lowest temperature limit shall always apply.
134r0069/002;1: Frozen :29-Jan-2024
Limiting deviation according to classes
Tolerances at 0 °C:
Platinum sensors (Pt1000):
DIN EN 60751, class B ......................................................................... ± 0,3 K
ATTENTION, NOTE !
Testing current influences the thermometer's measuring accuracy
due to intrinsic heating and therefore, should never be greater than
as specified below:
Sensor current, maximum
Pt1000 (thin-layer) ............................................................................ < 0.6 mA
7
I
max