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15
PP471
MODULE FOR PRESSURE MEASUREMENT
The PP471 module acts as an interface between the TP704 and TP705 series Delta Ohm probes and
the instrument.
The TP704 series pressure probes have a 1/4” BSP threaded male connection and must be screwed
in the joint where you wish to measure the pressure. The TP 705 series have two Ø5 connections
where the suitable tubes are inserted in order to perform the desired measurement. Please pay
careful attention to the joint pressure sealing; use suitable gaskets and joints. A plastic cap protects
the threaded connection. Put it back after use as it protects the pressure cell from foreign bodies.
VERY IMPORTANT: ensure the probe's bottom scale is higher than the pressure that will be
measured. In case this value is unknown, start by using higher-capacity probes.
For every pressure probe a range of overload pressure and a burst pressure are declared:
pressures in the range of overload pressure don’t cause the break of the sensor but the
declared accuracy can be overcome. Pressure over the stated burst pressure may break the
sensor. The application of higher pressures than the overload pressure limit, although lower
than the burst pressure, may produce permanent damage to the probe (e.g. offset shift). Never
exceed the stated burst pressure.
Please see the technical characteristics of the probes on page 31.
Upon turning on the instrument automatically detects the PP471 module. The probe's type
(absolute, relative or differential) and bottom scale value are detected even when the instrument is
on. If no logging or recording operations are in progress, it is possible to change the probe
connected to the module without turning the instrument off and on again.
The measurement provided can be the instantaneous or the peak value of the pressure: please see
the PEAK key description on page 12.
When the PP471 pressure module is connected, the internal sensor is disabled.
D
IRECT INPUT INTO
Pt100,
Pt1000
AND
Ni1000
T
EMPERATURE PROBES
The instrument accepts the input of Platinum temperature probes with resistances of 100Ω and
1000Ω, as well as Nickel temperature probes with a 1000Ω resistance.
The Pt100 are connected to 4 wires, the Pt1000 and Ni1000 to 2 wires, with the excitation current
chosen minimizing 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.
For the temperature probes without SICRAM module (Pt100 4 wires, Pt1000 and Ni1000) the
model configuration is required (please see the description of the Probe Type menu on page 10).
The °C or °F unit of measurement can be chosen for display, printing, and logging using the °C/°F-
ESC key.
How to measure
The response time for the measurement of the temperature in
air
is greatly reduced if the air is
moving. If the air is still, stir the probe. Please remember that the response times in any case are
longer than those for liquid measurements.
The temperature measurement by
immersion
is carried out by inserting the probe in the liquid for at
least 60mm; the sensor is housed in the end part of the probe.
