Honeywell DCP552 Mark II user manual Detailed descriptions of setup data settings

Chapter 7. PARAMETER SETUP

■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.

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●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.

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