HND-P231/-233/-236/-239
HND-P231/-233/-236/-239 K05/0422
page 11
8. Remarks to special features
8.1 Different Kinds of Measuring: „rAtE-Slo, -P.dEt, -FASt“
Three different kinds of measuring pressure are supported. Two of them are
working with high measuring frequency of more than 100 measurings per second.
If one of them was chosen in the configuration (see above), this will be displayed
in the secondary display: „P.dEt“ or „FASt“.
8.1.1
rAtE-Slo: Standard Measuring
Measuring rate 4 Hz, averaging and filter functions are active.
Application: Measuring of slowly changing or static pressures, e.g. measuring of
leakproofness, athmospheric pressure...
Highest accuracy, high noise immunity (EMI and unstable measuring signals),
low power consumption.
8.1.2
rAtE-P.dEt:
Peak detection
Measuring rate >1000 Hz, the value is displayed unfiltered.
Application with logger function: Measuring of short pressure peaks or fast
changing pressures with a resolution of < 1 ms. The cyclic logger function records
the arithmetic mean value, the highest and the lowest peak of the referring time
interval.
Attention: higher power consumption, measuring is sensitive to noise (EMI,..).
8.1.3
rAtE-FASt:
Fast filtered measuring
Measuring rate >1000 Hz, the value is filtered slightly (higher noise immunity than
P.dEt, small peaks will be filtered out), apart from that identical behavior like
P.dEt.
8.2 Sea Level Correction (only for HND-P239)
The device displays the absolute pressure measured at the sensor. This is not
necessarily the same like the values given by weather stations! The weather
stations‘ values are giving the pressure at sea level. Usually, the sensor is placed
above sea level and therefore, if the value at sea level (zero) is to be measured,
the pressure loss resulting from the actual level above sea level has to be
considered! To correct the measuring display, activate the „Sea-Level-Function“.
Then enter the altitude above sea level of the sensor‘s location in meters (Alti,
p.r.t. chapter 7.7). When activated, the display shows the SL-arrow and the
device displays the pressure value at sea level.