VELTRON DPT-
plus
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-
plus
- IO&M Manual
15
5.3 – NORMAL OPERATION
Under
Normal
operation the VELTRON DPT-
plus
display will continuously indicate current process variables or other
selected parameters.
AUTO-zero
. At periodical intervals* (see Factory Set-Up Information Sheet) the AUTO-zero cycle will be initiated.
When this occurs, the display values and outputs will remain constant and will appear in the upper right of
the display for the duration of the AUTO-zero cycle.
This cycle will not occur if AUTO-zero has been turned OFF in configuration programming (see Section 5.9).
The AUTO-zero cycle can be manually activated by user (if ON in configuration programming) by simultaneously
pressing and . Cover must be removed to gain access to pushbuttons (see Section 5.4).
If remains on after the AUTO-zero cycle is complete or flashes rapidly, refer to Section 8 - Troubleshooting
for required action.
*Note:
– The interval clock for AUTO-zero cycles is initiated when the VELTRON DPT-
plus
power is turned on. The
time intervals (preset in User Setup menu) will then start their timing sequence.
– To reset the interval clock, turn power off for a minimum of 10 seconds, then turn power back on. Interval
clock will then initiate at time zero.
– Changing the interval selection in User Setup does not reset time clock.
AUTO-purge
. If the AUTO-purge option has been enabled at the factory (see Factory Set-Up Information Sheet), it
will be activated at periodic intervals determined by the "smart relay" (located in the AUTO-purge panel) program-
ming. When activated, display will be frozen and all outputs will remain constant, and will appear in the
upper right of the display for the duration of the purge cycle. Length of cycle depends on purge duration and after-
purge duration (see Factory Set-Up Information Sheet).
Alarms
. If the Alarm option has been enabled at the factory (see Factory Set-Up Information Sheet) and process
conditions exist to activate the alarm, the will appear in the display and corresponding alarm relay will be
energized (after set delay time).
5.4 – CONFIGURATION
The VELTRON DPT-
plus
onboard microprocessor controls Configuration: Operating parameter selection; input/output
activation and scaling, display scaling, and transducer calibration.
The customer can verify configuration and change certain parameters (within defined ranges) by entering the VELTRON
DPT-
plus
Configuration mode. This is accomplished using the four pushbuttons located beneath the VELTRON DPT-
plus
display end cover.
To gain access to the programming pushbutttons, the cover must be removed.
CAUTION:
With cover removed, ESD (electrostatic discharge) precautions should be observed at all times to
protect sensitive components.
SECTION 5 – OPERATION
zero
X
zero
purg
alrm
