Honeywell DCP552 Mark II - Manual (Page 130)

7-31
■ Detailed descriptions of setup data settings
● C07 (PV1 cold junction compensation)
● C17 (PV2 cold junction compensation)
• 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 DCP552.
● C08 (PV1 square root extraction)
● C09 (PV1 square root extraction dropout)
● C18 (PV2 square root extraction)
● C19 (PV2 square root extraction dropout)
• 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
C09 or less than the dropout set
in C19 , an output of 0% can be obtained in the square root process.
• Square root extraction is not performed when C08 and C18 are set to 0.
● C46 (auxiliary output 1 lower limit)
● C47 (auxiliary output 1 upper limit)
● C49 (auxiliary output 2 lower limit)
● C50 (auxiliary output 2 upper limit)
• 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 generate an output of 4mA.
Thus
C46 is set to 200.0 and C47 is set to 0.0.
200%
Auxiliary output 1
MV
20mA
100%
12mA
4mA
100%
100%
Output of root extraction (Y)
Dropout value
(0.2 to 10.0% variable)
Input (X)
Y= (X/100) 1/2 × 100
Chapter 7. PARAMETER SETUP