omnigrad M TR 44, TR 45
4
Hauser
Response time
Test in water at 0.4 m/s (according to DIN EN 60751; 23 to 33°C step changes)
Insulation
Insulation resistance between terminals and probe sheath
more than 100 MOhm at 25°C
(according to DIN EN 60751, test voltage 250 V)
more than 10 MOhm at 300°C
Self heating
Negligible when E+H iTEMP
®
transmitters are employed.
Installation
Omnigrad M TR 44 and TR 45 can be mounted on
the wall of pipes or vessels.
The counterparts for the process connections and
the respective gaskets or sealing rings, are generally
not supplied with the sensors, and are considered
to be the customer's responsibility (EHEDG and 3-
A
®
requirements must be fulfilled).
The G1" connection is the only exception for which
the sensor with the adaptor to be welded on the
plant can be supplied.
As a general rule, the sensors should be installed in
such a way that does not adversely affect their
cleanability.
With regard to ATEX-certified components (trans-
mitter, insert), please refer to the specific documen-
tation (see the code at the end of this document).
The immersion length may affect the accuracy of
the sensors. If it is too low, an error might be gen-
erated in the measurement of the temperature, due
to the lower temperatures of the process fluid near
the walls, and to the heat transfer which occurs
through the sensor stem.
The incidence of such error could be not negligible
if there is a big difference between the process and
the ambient temperature.
To avoid this source of inaccuracy, probes with low
diameter must be employed, and the immersion
length (L) should be, if possible, at least about 80
mm. In small pipes, the axis line of the duct must
be reached, and even slightly exceeded, by the tip
of the probe (see figure 3).
Insulation on the outer part of the sensor reduces
the effect of the low immersion. Another solution
could be a tilted installation (see figure 2).
Fig. 2:
General installation solutions
In case of two-phase flows, attention should be paid in the choice of the measurement point, which may cause
fluctuations in the detected temperature value.
Sensor type
Response time
Without thermo-
conductive paste
With thermo-
conductive paste
TR 44 (
∅
6 or 8 mm reduced)
t
50
5 s
-
t
90
13 s
-
TR 45 straight tip
t
50
20 s
10 s
t
90
60 s
30 s
TR 45 tapered tip
t
50
12 s
5 s
t
90
40 s
12 s
TR 45 reduced tip
t
50
7,5 s
3.5 s
t
90
21 s
8 s
Insulation
h<d/2
d
