Table of Contents
Advertisement
PRESYS
|
Instruments
DEC PT. - sets the decimal point to exhibit the engineering units on the upper
display. Up to three decimal digits may be set for pressures and linear processes,
whereas temperature sensors may have one or no decimal digit.
OFST (as shown on the upper display) - it allows the user to enter a fixed off-
set value, in engineering units, in addition to the value shown on the upper display.
This is a useful option whenever we have more than one instrument controlling the
same process variable and showing slightly different readings. The OFST parameter
may be used to equalize instrument measurements.
CJC - an option to select whether or not to have a cold junction compensation
for thermocouple measurements. In case a cold junction compensation is desired,
the internal compensation (INT) should be selected, otherwise, NO should be
selected. Usually, INT is selected.
The types of input sensors are described on table - 1 of section 1.3 on
Technical Specifications.
FILTER - this parameter provides the time constant for a first order digital filter
associated with the selected input. Whenever no filtering of the controlled signal is
desired, zero should be assigned to this parameter.
B.OUT - in case of temperature sensor failure (thermocouple or RTD) or break
of the connection wire, the display indicates burn-out. In such cases, the UP option
for this parameter activates the high alarms and the DOWN option activates the low
alarms. When occurring the burn-out with the Controller in the automatic mode, it is
automatically switched to the manual mode and the output changes to the value
defined for PO.BR parameter. When occurring the burn-out with the Controller in the
manual mode, it remains in manual mode and the output continues with the value
adjusted by the operator, not changing to PO.BR value. When the Controllers leave
the burn-out condition, they return to the mode in which they were operating prior to
occurrence of burn-out.
UNITS - selects °C or °F for temperature indication.
3.2.3 - Level 3 - Outputs
Level 3 allows the control output types to be configured in accordance with the
option module internally installed in the Controllers (see figure 17). Six types of
outputs are available for control outputs 1 and 2:
(1 to 5V), voltage (0 to 10V), SPST relay, open collector voltage and solid-state relay.
DCY - 2057 Pressure Controller
current (4 to 20mA), voltage
Operation
Page 30
Advertisement
Table of Contents
