APG DCR-1006 user manual - Manual (Page 26)

DCR-1005 and DCR-1006 Rev. A4, 10/08
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Automation Products Group, Inc.
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Temperature Compensation
As air temperature changes, so does the speed of sound. This change can
cause 0.18% drift in distance for every degree C change. Mode 35 allows
compensation in the readings for this change. The DST contains an internal
thermistor which measures temperature in degrees F. By turning temperature
compensation on, the effects of temperature changes are be reduced.
For the DST temperature sensor to operate properly, it must be shielded from
radiant heat. Because the temperature sensor is internal to the DST, it requires
several minutes to react to air temperature changes.
MODE DESCRIPTION PARAMETERS
35 Temperature Range = 0 - 2
Compensation 0 = OFF
1 = ON
2 = Current Temp.
Default = OFF
EXPLANATION
Selects internal temperature
compensation for changes in the
speed of sound, on, off, or view
sensor temperature set by V-UP
or V-DN.
Calibration
For most open air applications, the factory-set calibration should be correct.
Variations between the distance measured by the DCR/DST System and the
actual distance are caused by environmental conditions such as temperature,
humidity, or chemical atmospheres. These environments can be compensated
for by using a calibration factor which alters the reading to match the
application conditions.
MODE DESCRIPTION PARAMETERS EXPLANATION
36 Distance Offset Units = mode 1
Range = 0.000 - 9999
Default = 0
37 Offset Polarity Range = 0,1
0 = Subtract
1 = Add
Default = NEG
38 Calibration Range = 0 - 9999
Above the Default = 1
Decimal Point
39 Calibration Range = .0000-.9999
Below the Default = 0
Decimal Point
Sets an offset for the
display when measuring
distance to a level.
Selects the direction of the
offset. adds or subtracts
offset to reading. Set by V-
UP or V-DN.
Sets the integer portion of
the calibration factor.
Sets the fractional portion
of the calibration factor