DeltaOHM HD31, Operating Manual

Page: 25 / 154

HD31
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V1.6
7. Using
S
and
T
, select the probe type: "SICRAM" (default),
“DIRECT Pt100” or “DIRECT Pt1000”.
Note : the current setting appears in white color, while the
other available settings are in yellow color to highlight that
they are not the current setting.
8. Press F3 ( OK command) to confirm.
9. Turn the instrument off and then back on.
Note : the probe type setting is maintained if the instrument is switched off with the probe
connected; the setting returns to the default value (“SICRAM”) instead if the instrument is
switched off when the probe is disconnected.
4.2 T
HERMOCOUPLE TEMPERATURE PROBES
K, J, T, E, R, S, B and N-type thermocouple temperature probes can be connected. A SICRAM
module has to be placed between the probe and the instrument choosing from the modules below:
• TP471D0 : 1-input module without cold junction compensation.
• TP471D : 1-input module with internal sensor for cold junction compensation.
• TP471D1 : 2-input module with internal sensor for cold junction compensation.
If TP471D0 module is used, without cold junction compensation, the cold junction will have to
be kept at a temperature of 0 °C using a melting ice bath.
TC
Fig. 4.2.1: cold junction at 0 °C
If TP471D and TP471D1 modules are used, the cold junction temperature is measured by the
internal sensor and is used by the instrument to compensate the thermocouple measurement.
The instrument displays also the cold junction temperature (as second quantity, e.g. A2, for
the 1-input module, and as third quantity, e.g. A3, for the 2-input module).
See paragraph 13.2 at page 93 to set the type of thermocouple connected to the modules.
Copper
Melting ice bath