Endress+Hauser ria45 - Page 27

RIA45 Commissioning
Endress+Hauser 27
Time base:
Time base of gradient calculation
Enter the time base in seconds. Only for operating
mode Gradient.
Hysteresis:
Hysteresis. The switch point can be controlled by
means of a hysteresis for every limit value.
The hysteresis is configured as an absolute value (only
positive values) in the unit of the channel in question
(e.g. upper limit value = 100 m, hysteresis = 1 m: limit
value on = 100 m, limit value off = 99 m)
• Please note special situations if both the hysteresis and the delay time should be
activated simultaneously (see the following description in the Operating modes
section).
• Following a power failure, the limit value monitoring system behaves as if the limit
value had not been active before the power failure, i.e. the hysteresis and any delay
are reset.
Relay specification
Relay contact Changeover
Maximum contact burden DC 30 V / 3 A (permanent state, without destruction of the input)
Maximum contact burden AC 250 V / 3 A (permanent state, without destruction of the input)
Minimum contact load 500 mW (12 V / 10 mA)
Galvanic isolation towards all other circuits Test voltage 1 500 V
AC
Switching cycles > 1 million
Default setting Normally closed: Rest contact Rx1/Rx2
Operating modes
Off
No action is triggered. The output assigned is always in the normal operating mode.
Min (lower limit value)
The limit value is active if the value configured is undershot. The limit value is switched off
again if the limit value incl. hysteresis is overshot.
t
Measured value
Threshold
“off”
Hysteresis
Setpoint
Setpoint “on”
Setpoint “off”
A0010186-EN
 6 Min operating mode
Max (upper limit value)
The limit value is active if the value configured is overshot. The limit value is switched off
again if the limit value incl. hysteresis is undershot.