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4.2 DIRECT INPUT INTO Pt100 AND Pt1000 TEMPERATURE PROBES
The instrument accepts the input of Platinum temperature probes with resistances of 100Ω (Pt100)
and 1000Ω (Pt1000).
The Pt100 are connected to 4 wires, the Pt1000 to 2 wires; the excitation current was chosen in
order to minimize the sensor self-heating effects.
All probes with module are calibrated in the factory, the 2 or 4 wire probes with direct input are
checked for conformity with class A tolerance according to norm IEC751 - BS1904 - DIN43760.
The probes with SICRAM module and the Delta Ohm Pt1000 probes are detected by the
instrument; the model configuration is required for the other probes (please see the description of
the Probe Type menu item on chapter 3).
4.2.1 Temperature measurement
The temperature measurement by immersion is carried out by inserting the probe in the liquid for at
least 60 mm; the sensor is housed in the end part of the probe.
In the temperature measurement by penetration the probe tip must be inserted to a depth of at least
60 mm, the sensor is housed in the end part of the probe.
NOTE: when measuring the temperature on frozen blocks it is convenient to use a mechanical tool
to bore a cavity in which to insert the tip probe.
In order to perform a correct contact measurement, the measurement surface must be even and
smooth, and the probe must be perpendicular to the measurement plane.
So as to obtain the correct measurement, the insertion of a drop of oil or heat-conductive
paste between the surface and the probe is useful (do not use water or solvents). This method
also improves the response time.
4.2.2 Connecting the TP47 connector for the 4 wire Pt100 and 2 wire Pt1000 probes
All probes produced by Delta Ohm are provided with a connector.
The Thermohygrometer Model HD2301.0R also work with direct 4 wire Pt100, and 2 wire Pt1000
probes manufactured by other producers: for the instrument connection is prescribed the TP47
connector to which the probe's wires should be welded.
The instructions to connect the Platinum probe to the TP47 module are provided below.
The TP47 module is supplied complete with fairlead and gasket for 5 mm maximum diameter
cables.
Do the following to open the module and connect a probe:
1. unscrew the fairlead;
2. extract the gasket;
3. remove the label using a cutter;
4. unscrew the ring on the opposite side as illustrated in the figure:
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