Detailed Descriptions Of Setup Data Settings - Honeywell DCP551 Mark ΙΙ User Manual

Chapter 7. PARAMETER SETUP

Detailed descriptions of setup data settings

C07
(PV1 cold junction compensation)
C17
(PV2 cold junction compensation)
C08
(PV1 square root extraction)
C09
(PV1 square root extraction dropout)
C18
(PV2 square root extraction)
C19
(PV2 square root extraction dropout)
C46
(auxiliary output 1 lower limit)
C47
(auxiliary output 1 upper limit)
C49
(auxiliary output 2 lower limit)
C50
(auxiliary output 2 upper limit)
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• This is a selection for cold junction compensation for thermocouples.
• When set to 1, perform 0°C compensation using a cold junction compensation device
outside the DCP551
• Flow pressure detected by the orifice of a normal differential pressure type flowmeter
is proportional to the power 2 of the flow rate signal. Consequently, square root
extraction is used when a uniform signal is needed.
When the input in the square root extraction is
C19
, an output of 0% can be obtained in the square root process.
• Square root extraction is not performed when
Output of root extraction (Y)
100%
Dropout value
(0.2 to 10.0% variable)
• This is the scaling setting of the auxiliary output. The high and low values for the
upper and lower limits can be reversed.
• The example below shows that the output from auxiliary output 1 is 12mA when MV
is 100% and 20mA when MV is 0%. As shown, a 200% MV value is required to gen-
erate an output of 4mA.
C46
Thus is set to 200.0 and
Auxiliary output 1
20mA
12mA
4mA
100%
C09
or less than the dropout set in
C08
and
´
Y= (X/100) 1/2 100
Input (X)
100%
C47
is set to 0.0.
MV
200%
C18
are set to 0.