6
+5
The probe carriers must be grounded
using copper or stainless steel wires with
a minimum conductor area of 10 mm
2
.
The electrical connection is made in
compliance with the connection diagram
shown in Fig. 3. Connection is identical
for all probe carriers.
5.7 Start-up and maintenance of
the T probe
No start-up procedure is necessary for T
probes supplied together with the stand-
ard transmitter. When the transmitter
has been connected to the power supply
unit, the T probe is ready for use. How-
ever, we recommend verifying whether
the transmitter’s measuring range as set
by Pfaudler complies with your require-
ments. The measuring range setting is
indicated on a rating plate each on the
transmitter and in the terminal box as
well as in the test report.
If necessary, the measuring range can
be changed. Upon final acceptance in
the factory, a functional test and a sin-
gle-point calibration will be performed.
A test report will be prepared which is
attached to each probe.
If the T probe is ordered and delivered
without a transmitter, it is the operator’s
responsibility to ensure that a suitable
transmitter is used and configured (refer
to Sect. 5.3). The values comprised in
the characteristic of the thermocouple
are provided in the attached test report.
Due to its special construction (thermo-
couple fused into glass layer) and non-
critical operating conditions, the probes
are not subject to ageing. Therefore,
inspections (calibration) of the thermo-
couple are not necessary for measuring
reasons. As a result, the T probe is main-
tenance-free.
3
1
power supply unit with electrical
isolation Ex ia/ib
max. 30 V DC 100 mA
current output
4 -2 0 m A
power Supply 24 V DC/AC
(230 V AC)
T probe
MT_05_003_1e
+ red
– violett
}
optional floating
change-over
contacts
Fi
g. 3 Connection diagram of the T probe
5.6 Connection of the T probe
The following information only applies to
T probes in c
onnection with the TH02-Ex
transmitter.
A power supply unit with the following
specifications is necessary for power
supply:
n Supply current: I
S
= 0 - 20 mA
n Supply voltage: U
S
= 8,5 ... 30 V DC
n in potentially explosive
atmospheres: U
i
= 8,5 ... 29,4 V DC
For applications in potentially explosive
atmospheres, power supply units in
intrinsically safe design must be used.
The power supply unit must be installed
outside the potentially explosive area.
The installation instructions of the manu-
facturer are mandatory in this respect.
The connection between the power sup-
ply unit and the transmitter can be made
using standard signal cables.
© Pfaudler GmbH · OI 302-8 e
9
Temperature probes type T/TW
© Pfaudler GmbH 9
Temperature probes type T/TW
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