APG DCR-1004 user manual - Manual (Page 30)

DCR-1003 and DCR-1004 Rev. A3, 10/08
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Automation Products Group, Inc.
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DIFFERENTIAL
The DCR-1003, 1004 can determine the difference between two levels. This is
accomplished by installing two DSTs at the same height, one over each level to
be monitored. The DSTs are then programmed as different sensor numbers, # 1
and # 2. The DCR-Controller will take the two level readings and display the
difference.
MODE DESCRIPTION PARAMETERS EXPLANATION
36 Change Sensor Units = sensor # Selects which number to assign
Number Range = 1 - 2 to the sensor connected to the
Default = none DCR.
ONLY ONE SENSOR SHOULD BE Set by NUM UP or NUM DN
CONNECTED WHEN USING THIS MODE
37 Display Control Units = sensor # Selects which sensor distance
Range = 0 - 2 will be displayed. Default is the
0 - display differential difference between DST #1 and
1 - display sensor #1 DST #2.
2 - display sensor #2
Default = 0
Example 7: Differential Reading
A mechanical rake is to be engaged for cleaning a screen when the upstream
level is 2 feet higher than the downstream level. To program the DCR-1003, 1004
for this application, the following modes must be changed from their preset
values.
MODE VALUE DESCRIPTION
Operation
3 3 Select Differential Monitoring for application
5 2.00 Do not set closer than the minimum distance
recommended for the DST sensor type being used
Relay
12 2.00 Begin trip point # 1 when the difference between levels is
greater than 2 ft.
13 3.00 Set the end point beyond the begin point
14 3 Set the trip type to ‘far’, meaning the relay will energize for
display readings greater than 2 ft.