HD2114P/HD2134P
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V2.3
2) Moving average
The Duct Calc function provides a spatial averaging of the captured values and therefore
compensates the speed differences between one point and another in the duct section. There is
also another source of errors due to the variation of the flow
in time
: that is, the flow is not
constant but increases or decreases
in the same point
. To compensate for this second source of
instability, it is possible to get a temporal moving average of the last
n
measurements capture:
with n>1, the displayed value will not be the single captured value but the continuously updated
current average of the last
n
measurements.
To set the "
n
" value, use the
AVG TIME SECS
menu
function: by using the arrows select the
desired
n
value and confirm with ENTER. "
n
" can be set from 1 (no average) to 99.
Important
:
the nominal bottom scales of internal sensors (20, 200mbar) are referred to
atmospheric pressure
,
therefore on each of the two inputs no relative pressure exceeding the
maximum stated overpressure should be applied. Each of the two sensor inputs can bear without
breaking–
but without measuring
–the overpressures reported in the following table:
HD2114P.0 - HD2114P.2
HD2134P.0 - HD2134P.2
Measurement range
±
20mbar
±
200mbar
Maximum overpressure
±
300mbar
±
1bar
Some units of measurement require a degree of multiplication: the "-3" symbol indicates the
displayed value must be divided by 1,000; the "3" and "6" symbols indicate the displayed value
must be multiplied respectively by 1,000 or by 1,000,000.
T
EMPERATURE MEASUREMENT
The instruments can be used as thermometers, can be employed with any kind of thermocouple K
probe if using a standard miniature connector. The instrument's measuring range in the thermometer
version is -200…+1370°C.
The contacts of the thermocouple probe connector are polarized. They must be inserted on the
standard miniature socket located on the instrument in the correct direction. These probes are
usually marked with a + and – sign: These symbols must coincide with the corresponding symbols
located on the instrument's rubber protection.
The user can choose the unit of measurement for display, printing and logging among the allowed
ones: °C or °F.
In all versions the thermocouple sensitive element (hot junction) is housed in the end part of the
probe.
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. The response times 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 hot junction is housed in the end part of the probe.
