User manual

OPERATION MANUAL
Technical changes reserved
0141 0316-41 21.08.2015
Evaluation electronics for
ceramic pressure sensors - DS-MOD-
Calibration arrangement
For the described calibration, the sensor can be subjected to pressu-
re.
Some device, for example a pneumatic hand pump, is required for
creating the pressure. Our model KAL-KHP30 is suitable for creating
reference pressure of vacuum (approx.900 mbar) as well as high
pressure of up to 30 bar. The pressure can be accurately adjusted to
the desired value by the volume adjustment integrated in the pump.
Parallel to the test piece, the pressure must be also determined with
a suitable accurate pressure reference instrument, in addition to the
output voltage / output current of the electronics.
Ideal for this is the pressure calibrator KAL-MC2G. The device contains
a pressure reference instrument, a highly accurate voltage and current
instrument as well as 24 V voltage source for feeding the electronics.
Manual adjustment
The sensor electronics is pre-calibrated at offset 0 mV and full scale 7
mV. For adaptation of a specic sensor, the two potentiometers „Offset“
and „Gain“ have been provided.
First, the zero point is positioned, then the output voltage without pres-
sure is adjusted to 0 V with the potentiometer „Offset“. Afterwards the
sensor is subjected to approx. 80 % of maximum pressure and the
voltage is adjusted to desired value corresponding to the scale with the
„Gain“ potentiometer.
The adjustment is to be mutually repeated several times, because the
two potentiometers slightly affect each other.
Assembly in a housing
The outer prole of the circuit board ts into a housing type PK101,
which we offer as accessories.
Digital adjustment
Much more accurate results (up to 0.1 % FS) and a compensation of
linearity error as well as temperature drift is possible with digital adjust-
ment. The two soldered joints JP1 and JP2 on the lower surface of the
circuit board must be opened, in order to separate the potentiometer
network.
The applied ASIC ZMD 31050 enables correction of up to eight pres-
sure reference points and three different temperatures. The correction
is done in the chip with arithmetical methods by means of polynomial
of second or third order.
For digital adjustment, a set of corresponding equipment (calibrator
and temperature panel) is required. Moreover, the user should have
required technical knowledge.
Please note that we cannot provide any telephone support services for
digital adjustment.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 8316-50 | info@bb-sensors.com | bb-sensors.com
3 / 5