18
6 Setup with the integrated display and adjustment unit
SU 600 • 4 … 20 mA signal conditioning instrument
30652-EN-150129
6.3 Application example
•
An upright cylindrical (linear) tank has a volume of 2700 l
•
The max. filling volume is 2650 l, the min. filling volume 50 l
•
The level sensor in the vessel is a pressure transmitter (passive),
outputting a standardised 4 … 20 mA signal
•
For further processing, an additional 4 … 20 mA output signal is
required
•
The full and empty adjustment was carried out directly in the sen-
sor. The following values are outputted:
– Max. volume (display max.) 20 mA = 2650 l
– Min. volume (display min.) 4 mA = 50 l
•
Relay 1 should switch on an emptying pump at a level of 90 % and
switch off the pump at a level of 10 %
1. Select the following functions with the rotary switch.
2. Push one of the two [
+/-
] adjustment keys, the digital indication
flashes (if the rotary switch is set to "
OPERATE
", the [
+/-
] keys are
inoperable)
3. Adjust the requested value with the [
+/-
] keys. If you hold the key
pushed, the digital indication changes the value more quickly.
4. Save your settings by pushing the [
+/-
] keys simultaneously
1. Set the function switch to position [
8
]. Select with the [
+/-
] keys
the measured value output 4 … 20 mA or 0 … 20 mA. For this
example, choose 4 - 20.
The displayed numbers have the following meanings:
•
0 - 20 = 0 … 20 mA
•
4 - 20 = 4 … 20 mA
2. Save the value by pushing [
+/-
] simultaneously
SU 600 requires for scaling of the indication, the adjustment of the
filling quantities for 0 % and 100 %. The vessel must neither be filled
nor emptied.
1. Set the function switch to position [
7
] (display min.)
2. Set the value to 50 via the [
+/-
] keys
3. Save the value by pushing both keys simultaneously
1. Set the function switch to position [
6
] (display max.)
2. Set the value to 2650 via the [
+/-
] keys
3. Save the value by pushing both keys simultaneously
Since the range of the example tank is between 50 l and 2650 l, you
need all 4 decimal places for the digital indication.
1. Set the function switch to position [
5
] (Decimal Point)
2. By pushing the [
+/-
] keys, you move the decimal point
3. Save the value by pushing both keys simultaneously
•
Set the function switch to position [
1
] (relay 1 on). For the given
example, select the value 90.0 (90.0 %) with the [
+/-
] keys. The
internal relay 1 then switches on when this value is reached. Save
the value by pushing the two keys simultaneously.
General procedure
Current output
Scaled indication at 0 %
Scaled indication at
100 %
Decimal point
Relay
Summary of Contents for SU 600
Page 1: ...Operating Instructions SU 600 4 20 mA signal conditioning instrument Document ID 30652...
Page 30: ...30 Notes SU 600 4 20 mA signal conditioning instrument 30652 EN 150129...
Page 31: ...31 Notes SU 600 4 20 mA signal conditioning instrument 30652 EN 150129...
Page 32: ...Subject to change without notice 30652 EN 150129...
