omnigrad M TR 44, TR 45
8
Hauser
Probe
In TR 45, the measuring probe is constituted by a mineral insulated insert positioned inside the thermowell.
For its replacement, the insert length (IL) must be chosen depending on the immersion length (L) of the ther-
mowell. Should a spare part be required, please refer to the following table:
In TR 44 the protection well and the sensing part cannot be separated.
The immersion length is available in some standard values or it can be supplied in a "customized" version within
a range (please see the product structures in the last pages of this document). Up to a length of 50 mm the TR
44 may have a probe with 6 mm diameter only.
For special versions of TR 45, where the immersion is shorter than 30 mm, the diameter of the thermowell, as
in the reduced tip, should be 5.3 mm.
The starting material for the wetted parts can be supplied in compliance of Basler Norm 2 (BN2), which
imposes a limited ferrite content and consequently enhances corrosion resistance, on request. In some sensor
configurations, the compliance with the requirements of BN2 can also be assured after the welding and
machining operations, that is in the finished product. The surface roughness (Ra) of the wetted parts is supplied
down to 0.4 mm. Surface roughness below 0.4÷0.5 mm has not been proven to be advantageous in hygienic
applications. Electro-polishing is an electrolytic treatment of the metal surface, which results in it being
cleaned, levelled and passivated.
To improve the heat transfer between the well and the internal sensing insert in the TR 45, a thermo-conduc-
tive compound can be fitted inside the thermowell, on request. The compound should not be requested for
immersion lengths longer than 300 mm, and where it would be used in temperatures of over 200°C.
Fig. 7:
Standard wiring (3 wires)
Fig. 8:
Functional components in TR 45
Sensor
Probe tip
Insert
Insert diam.
Extens. neck
Insert length mm
TR 45
straight
TPR 100
6 mm
82
mm
IL = L + 92
TR 45
red./tapered
TPR 100
3 mm
82 mm
IL = L + 92
TR 45
straight
TPR 100
6 mm
E
IL = L + E + 10
TR 45
reduced./tapered
TPR 100
3 mm
E
IL = L + E + 10
1xPt100
3 wires
Red
Red
White
Red
Red
White
121.5
E
L
D
d
R= 3.2
E
L
d
26
D
Sensing
length
Sensing
length
Ø42
Ø33
M4
Ø6
TW
47
h
d
13
01
