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PRESYS
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Instruments
4.5 - Calibration
DMY-2011, 2035 and 2036 Indicators are accurately calibrated in factory and
do not need periodic calibration in normal conditions. When calibration is required,
follow this procedure below.
Disconnect the process signals of I/O terminals.
Before calibrating the instrument, keep it turned on for at least 30 minutes for
warm up.
This section contains two parts: input calibration and output calibration.
Input Calibration
This section describes the procedure for calibration of input 1 and input 2.
The accuracy and precision of the calibrator used for generating references
must be at least two times better than the specifications of the Indicator.
The following tables list the references related to the type of input to be
calibrated. The left column shows the mnemonics presented on the display during
the calibration process.
Check if the internal input jumpers are properly placed.
To perform the calibration, enter level 5 of Calibration. The calibration level
has a password system which avoids someone to enter this level accidentally and
damage any calibration parameter. The password for entering this level is
number 5.
Once the correct password is provided, select the input type to be calibrated.
Choose the channel to be calibrated by pressing ENTER. The display shows the
mnemonics related to the references required for the calibration process. The
references must be applied before selecting the corresponding mnemonic shown on
display. When the reference is stable, start the calibration by pressing ENTER. At
this moment the Indicator begins the calibration process while the mnemonic CAL
blinks on the display.
While the display is blinking the reference must remain connect to the input
channel being calibrated.
When the display stops blinking and presents the mnemonic corresponding to
the reference, the calibration process of the first calibration point will be finished.
Change to the next reference and press DOWN to select another point.
Between any two calibration points wait 1 minute at least. After this time is elapsed,
press ENTER to start calibrating this point.
After performing all references on the table related to the input type to be
calibrated, the calibration process will be finished.
It is possible to calibrate only one point without rendering invalid the other
points already calibrated, in case the calibration of this point was not carried out
properly.
In order to return to normal operation move back through the hierarchical
levels until reaching level zero.
DMY-2011, DMY-2035 and DMY-2036
Maintenance
Page 37
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