ATC770 Microprocessor-Based Pressure/Process Controller 47
the display. Press the ▲ key until
2
shows in the upper display. Press the FUNC key and the lower
display changes to
ZERO.C
. The upper display shows
OFF
. Press the ▼ or ▲ keys until the upper
display changes to
ON
. Press the FUNC key to calibrate the zero value. The lower display changes
to
SPAN.C
. The upper display shows
OFF
. Press the ▼ or ▲ keys until the upper display changes to
ON
. Press the FUNC key to calibrate the span value. When the legend
DSP.FL
appears in the lower
display, calibration is complete. Press A/M to return to the operating screen.
7.1.4 CALIBRATION OF ANALOG INPUTS USING A PRESSURE CALIBRATION SOURCE
Be sure that full scale and low scale values have been set to the range of the process sensor. Press
the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
4
shows in the
upper display. Press the FUNC key and the upper display should show
OFF
while the lower display
shows
SHUNT
. If the upper display does not show
OFF
, press the ▼ or ▲ key until the upper display
changes to
OFF
. Press the FUNC key to set the value and press A/M to return to the operating
screen.
Press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
2
shows in
the upper display. Press the FUNC key and the lower display changes to
ZERO.C
. The upper display
shows
OFF
. With low scale equivalent signal applied from an appropriate calibration source, press
the ▼ or ▲ keys until the upper display changes to
ON
. Press the FUNC key to calibrate the zero
value. When the lower display changes to
SPAN.C
, zero calibration is complete. With signal applied
equivalent to full scale value from an appropriate calibration source, press the ▼ or ▲ keys until the
upper display changes to
ON
. Press the FUNC key to calibrate the span value. When the legend
DSP.FL
appears in the lower display, calibration is complete. Press A/M to return to the operating
screen.
These inputs are factory pre-calibrated for the following ranges, and require no further calibration.
Voltage: 0-10 VDC
Current: 4-20 mA; 0-20 mA.
7.1.5 CALIBRATION OF THE ATC770 TO CALIBRATED LINEAR ANALOG INPUT
Be sure that full scale and low scale values have been set to the range of the process sensor. Press
the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
4
shows in the
upper display. Press the FUNC key and the upper display should show
OFF
while the lower display
shows
SHUNT
. If the upper display does not show
OFF
, press the ▼ or ▲ key until the upper display
changes to
OFF
. Press the FUNC key to set the value and press A/M to return to the operating
screen.
Press the FUNC key until
nonE
and
GROUP
show on the display. Press the ▲ key until
2
shows in
the upper display. Press the FUNC key and the lower display changes to
ZERO.C
. The upper display
shows
OFF
. With the input at the low scale value, press the ▼ or ▲ keys until the upper display
changes to
ON
. Press the FUNC key to calibrate the zero value. When the lower display changes to
SPAN.C
, zero calibration is complete. Press the ▼ or ▲ keys until the upper display changes to
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