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The HD 8804 is a portable
instrument with two inputs for measuring pressure and temperature. These
two inputs may be connected simultaneously: two pressure probes, so that
the difference between the two values ?p may be calculated as long as
the probes have the same full-scale value; two temperature probes, so
that the difference between the two values ?t may be calculated; or one
pressure probe and one temperature probe may be connected.
The HD 8804 enables both variables to be measured with an excellent degree
of precision in a range which is substantially limited only by the capacity
of the probes. As the probes are interchangeable, the most suitable combination
for all applications may be chosen without the need for recalibration.
Probes may be connected for measuring absolute pressure (with reference
to a vacuum), pressure relative to the atmosphere and differential pressure.
For temperature measurements the TP 870 series of temperature probes is
used, supplied in the versions for immersion TP 870, for contact measurements
TP 870/C, with a penetration point TP 870/P, for measurements in air TP
870/A. The temperature probes have a Pt100 platinum sensor. The liquid
or gas under pressure is in contact with the container of AISI 303 stainless
steel, the Alumina membrane and the Viton gaskets, so excellent compatibility
with most industrial fluids and gases is ensured. The probe contains active
electronics, the temperature working range is vast, 0...+80°C, while
the thermal drift is compensated. Calibration of the offset, the full
scale value, the thermal drift and the automatic identification of the
full-scale value of the probe is accessible and adjustable
inside the probe itself.
ESSENTIAL CHARACTERISTICS:
• Excellent cost/performance ratio.
• Versatile and easy to use.
• Pressure is measured in the units most widely used in engineering: bar,
Pa, psi, atm, mmHg, mH2O.
• Measurement of the difference in pressure ?P between the two connected
probes (A - B).
• Temperature measurement in the range -200...+800°C with a Pt100
platinum sensor.
• Measurement of the difference in temperature ?T between the two connected
probes (A - B).
• Autorange.
• Switches off automatically.
• Seven scales for measuring pressure, two scales for measuring temperature.
• Absolute, differential and relative measurements.
• Stores and displays the maximum and minimum value and the difference
between the inputs.
• Automatically recognizes the type of probe (full-scale value, pressure
or temperature).
• Allows 100% overload.
• Robust case.
• A beep sounds to indicate that a key has been pressed; one beep every
30 seconds indicates that the battery is running low.
APPLICATIONS
There are a great many applications of the pressure and temperature gauge,
ranging from the measurement of the draught in chimneys (a few mbar of
differential pressure) to high precision moulding machines (many tons/cm):
• Hydraulics;
• Fluidodynamics;
• Chemical plants and process controls;
• Compressors;
• Pumping plants;
• Capacity measurements with diaphragm;
• Moulding and presses for plastics and thermosetting materials;
• Measuring the level in tanks or silos.
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