RMS 621 6 Commissioning
Endress+Hauser 37
Setup Æ Pressure
A maximum of three pressure sensors can be connected to the unit. A single sensor can be used for
two or all three applications, see address "Terminals" in the following table.
Function (Menu
address)
Parameter set-up Description
Identifier Pressure 1-3 Identifies the pressure sensor, e.g. ’Return pressure’. (max. 12
characters)
Signal type Please select
4-20 mA
0-20 mA
Default
Selects the signal type for the pressure sensor. On setting
"default" the unit operates with a preset pressure.
Terminal Not used
A-11; A-12; B-11; B-12;
C-11; C-12; D-11; D-12
Allocates the terminal to which the pressure sensor is
connected. It is possible to use one sensor (pressure signal) for
more than one application. Select the respective terminal to
which the signal required is connected in the application.
(Multi calculations possible)
Engineering Units bar; kPa; kg/cm
2
; psi; bar
(g); kPa (g); psi (g)
Physical engineering unit of the measured pressure.
(g) = gauge, appears in the display when the engineering unit
has been selected as ’relative’. Identifies the relative pressure.
Engineering unit type absolute
relative
Indicates if the pressure measured is in absolute or relative
pressure (over pressure) units. If relative pressure is selected
then atmospheric pressure must also be entered in this section.
Format 9; 9.9; 9.99; 9.9.9999 Number of decimal points
Signal damping 0 to 99 s Time constant of a 1st order low pass filter for the input signal.
This function is used to avoid display fluctuations on high
fluctuating input signals.
!
Note!
Only selectable for the 0/4 to 20 mA signal.
Start value 0.0000 to 999999 Start value for the pressure value at 0 or 4 mA.
!
Note!
Only selectable for the 0/4 to 20 mA signal.
End value 0.0000 to 999999 End value for the pressure value at 20 mA.
!
Note!
Only selectable for the 0/4 to 20 mA signal.
Offset -9999.99 to 9999.99 Moves the zero point on the sensor curve. This function helps
by fine adjustment of the sensor.
!
Note!
Only selectable for the 0/4 to 20 mA signal.
Atmospheric pressure 0.0000 to 10000.0
1.013
Set up the ambient atmospheric pressure, in bar, at the point of
installation.
!
Note!
Address is only active if the "relative" was selected in
engineering unit type.
Default -19999 to 19999 Set-up of a predefined pressure with which the unit will
continue to operate as "default" if the sensor signal fails.
Average Not used
2 sensors
3 sensors
Average value calculation from a number of pressure
signals
(For details see ’Average calculation’ in the appendix)
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