ABUS Technologies DPSENSE-V Series Multi-Range Air Velocity Transmitter - Manual (Page 9)

ABUS TECHNOLOGIES INC.
9
DPSense
8. CALIBRATION
See Figure below, the DPSENSE-V transmitters can be recalibrated by the user
with two buttons marked “ZERO” and “SPAN”. There are four specifications that can
be recalibrated: pressure input zero and pressure input span, analog output zero (0 V
or 4 mA) and analog output full scale (10 V or 20 mA). The pressure and analog output
are calibrated separately. These recalibrated values will be stored in nonvolatile
memory without connection to external power or batteries. The factory calibration can
be stored forever and restored easily. Four pieces of equipment are needed for
recalibration: a stable pressure /different pressure source with the range exceeding the
one under tested; a manometer or gauge is also needed except the case that it has
been equipped together with the pressure /different pressure source. Additionally, a
voltmeter/milliammter with high accuracy is needed to test the analog output as well as
a stable power source. The processes of recalibration are as follows.
Calibration Buttons
8.1 Preparation
To connect the voltmeter / milliammeter and power supply to the transmitter is a correct way
according the different connection ways of the transmitter (2-wire or 3-wire). Make sure that the
polarities are connected in a right way. Please note that the transmitter should be in vertical position
either in the calibration process or the process of usage and installation.
8.2 Analogue Zero Calibration
Connect the voltmeter or milliammeter to the output of the transmitter in a right way. Hold the
“ZERO” button for 2-3 seconds, LCD will display: