Delta OHM HD40.2, Руководство пользователя

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HD402TR
- 3 -
V1.0
1 INTRODUCTION
The series of pressure ON/OFF relay switches HD402TR...L is suitable for controlling
the relative pressure with respect to atmosphere or differential pressure in the range
from ±250 Pa to ±200 kPa.
If the set threshold value is exceeded, the relay switch output is activated, the front
alarm LED lights up and an audible alarm sounds. The alarm can be configured to be
activated when the measurement becomes higher or lower than the set threshold. 1
or 2-threshold operating modes are available.
A silicon piezoresistive sensor with high accuracy and temperature compensation is
used, which allows excellent linearity, repeatability and stability over the time.
The auto-zeroing feature in the low range model (HD402TR1L) allows stable mea-
surements over the time without the need to recalibrate.
The instruments are equipped with a 4-digit LCD display and different units of mea-
surement can be chosen for each model.
The configuration can be made through the dip switches mounted on the circuit board
(only for the unit of measurement), via the internal buttons or by connecting the seri-
al port of the instrument to the PC.
Thanks to the particular sensor used, the instruments are insensitive to orientation
and position. Moreover, the high stability of the sensor over the time and in compari-
son to the changes in temperature allows eliminating the operations of maintenance
typically required to compensate for the aging and the deviation of the sensor zero.
The instruments are supplied ready for use and factory calibrated.
Power supply: 24Vac or 15...36 Vdc.