Berthold DUO XPERT LB 470RID, Operating Manual

Page: 153 / 240

LB 470RID Level 7 Main Menu Device Setup
56925-1BA2 Rev.02, 05/2021
153
For example, Simulation, plate space meas-
urement, and detector update.
System State: Warning The relay alarms when the event message
“Warning” is displayed. (Warning includes
“Out of specification”, “function check”
and “maintenance required”).
Interference Radiation Alarm
According to intensity of the interference radiation at the detector, one of three
operating states of the measuring equipment is recognized
Normal operation During normal operation the level measure-
ment is determined by the pulse rate in the
measuring channel and is indicated in percent
of the measuring range. The current output
value corresponds to the level measured in the
vessel.
Strong interference radi-
ation If the measurement is influenced by interfer-
ence radiation and exceeds the channel
difference tolerance band, the level measure-
ment can no longer be determined by the pulse
rate in the Measuring Channel. Then the EVU
switches over to interference radiation opera-
tion and derives the actual level from the pulse
rate in the Secondary Channel. The analog cur-
rent output is now the value taken from the
Secondary Channel.
When the interference radiation stops, (channel
difference <2%), the EVU switches back to the
Measuring Channel and the system returns to
the normal operating state.
Weak interference radia-
tion If the interference radiation cannot be sup-
pressed on account of the intensity or the
energy of the isotopes used in the weld check,
the EVU freezes the measurement on the last
reliably measured level value.
When the interference radiation stops the EVU
switches back to the Measuring Channel and
the system returns to the normal operation
state.