HD2301
- 13 -
V1.7
D
IRECT INPUT INTO
Pt100
AND
Pt1000 T
EMPERATURE PROBES
The instrument accepts the input of Platinum temperature probes with resistances of
100
Ω
(Pt100) and 1000
Ω
(Pt1000).
The Pt100 are connected to 4 wires, the Pt1000 to 2 or 4 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 page 9).
T
EMPERATURE 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.
C
ONNECTING THE
TP47
CONNECTOR FOR THE
4-
WIRE
Pt100
AND
2
OR
4-
WIRE
Pt1000
PROBES
All probes produced by Delta OHM are provided with a connector.
The HD2301.0 Thermohygrometer also works with direct 4 wire Pt100, and 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: