Continuous level measuring system
NB 4000
Technical information / Instruction manual
page G
Signal overview
Signal input:
Start of measurement
• Floating contact (terminal 24, 25) or
• 24 V DC voltage (terminal 25, 27), current consumption approx. 25mA, observe the polarity.
Duration of starting signal: 0.7 to 5s
The contact must be closed or the 24V signal must be present to start.
Measurement interruption
Used to avoid a measurement in case of filling and to interrupt a running measurement when filling
starts.
When the terminal 24 und 26 are opened, the sensor weight returns to the upper stop position.
If required, remove factory provided wire between terminal 24 and 26 and connect to the filling
coupling.
The contact must be closed to enable a measurement.
Signal output:
4-20mA
Programmable to indicate a level or a volume signal. The output is updated, when the sensor weight
touches the surface of the bulk good. It stays until the next measurement is done.
Signal output:
Relais
(optional)
Relais can be setted as shown in the following table:
Relay 1
Relay 2
Factory settings
Failure
Upper stop
position
Programmable
Reset pulse
Counting pulse
Relais set to "Upper stop position / Failure"
Relay 1: indicates a Failure (see also diagnostics "Failure" on page G20)
Relay 2: indicates "Upper stop position". The signal allows the user to determine whether the
measurement has come to its end. In this case the sensor weight is in its upper stop position, relay
contacts are closed.
Signal input / output
Signal output:
0/4-20mA
Signal output:
Relais
(optional)
max. 500 Ohms
Relay1
max. 250V AC, 2A, 500VA, non inductive
Fuse: max. 2A
Relay2
active, isolated
Nivobob
®
1
2
3
4
5
6
7
8
9
10
11
12
NB 4000
gi010413
13
