EN.IO.APC.APR.ALW
Revision 02.A.005/2020.06
9
1.3. Definitions and abbreviations
Table 1.
Definitions and abbreviations.
Item
no.
Abbr.
Meaning
1
LRV
"Lower Range Value"
– the value of the set range expressed in physical units corresponding to the current
of 4,000 mA, i.e. 0% of the output setpoint. The set range cannot exceed the set range limits. The mini-
mum width of the set range
|(URV-LRV)|
is limited to 10% of the base range
(URL-LRL)
.
2
URV
"Upper Range Value"
– the value of the set range expressed in physical units corresponding to the current
of 20,000 mA, i.e. 100% of the output setpoint. The set range cannot exceed the set range limits. The
minimum width of the set range
|(URV-LRV)|
is limited to 10% of the base range
(URL-LRL)
.
3
LRL
LSL
"Lower Range Limit" or "Lower Sensor Limit" - lower limit of set range expressed in physical units. Value
(URL-LRL)
or
(USL-LSL)
is referred to as the base transmitter range.
4
URL
USL
"Upper Range Limit" or "Upper Sensor Limit"
– upper limit of set range expressed in physical units. Value
(URL-LRL)
or
(USL-LSL)
is referred to as the base transmitter range.
5
LPL
"Lower Processing Limit"
– lower limit of digital processing of measured value. The transmitter processes
a digital measurement up to 50% of the base range width below the lower limit of set range
LRL (LSL)
.
After reaching the
LPL
and when below this value up to
LSAL,
the transmitter freezes the refreshing of
digital value of the measurement. In this situation, for Exd or Exi/Exd version of transmitter, error number
E0128 will be displayed on the display and diagnostic alarm mode I_AL<3,600 mA will be set. For stand-
ard or Exi transmitters, a message
‘’UndEr’’ will be displayed, and diagnostic alarm mode will be activated
depending on the settings I_AL<3,650 mA or I_AL>21,500 mA.
Additionally, collective status PV_OUT_OF_LIMITS and status PV_LOW_LIMITED in the Transducer
Block will be set, which can be read out in the diagnostic tab via HART communication.
6
UPL
"Upper Processing Limit"
– upper limit of digital processing of measured value. The transmitter processes
a digital measurement up to 50% of the base range width above the upper limit of set range
URL (USL)
.
After reaching the
UPL
and when above this value up to
USAL
, the transmitter freezes the refreshing of
digital value of the measurement. In this situation, for Exd or Exi/Exd version of transmitter, error number
E0128 will be displayed on the display and diagnostic alarm mode I_AL<3,600 mA will be set. For stand-
ard or Exi transmit
ters, a message ‘’OvEr’’ will be displayed and diagnostic alarm mode will be activated
depending on the settings I_AL<3,650 mA or I_AL>21,500 mA.
Additionally, collective status PV_OUT_OF_LIMITS and status PV_HIGH_LIMITED in the Transducer
Block will be set, which can be read out in the diagnostic tab via HART communication.
7
LSAL
"Lower Saturation Limit" - lower limit of the A/D transmitter processing range. The lower limit of the A/D
transmitter saturation is on the pressure/differential pressure scale below the
LPL
point and is associated
with the minimum pressure, at which the analogue-digital pressure measurement transmitter reaches the
lower limit of the processing capacity. The exact determination of this pressure is not possible, however
usually the pressure does not exceed the pressure corresponding to 200% of the base range width
(URL-
LRL)
below the lower limit of the digital processing of measured
LPL
value. After reaching
LSAL
and
when below this value, error number E0136 will be displayed on the display and the diagnostic alarm
mode I_AL<3,600 mA will be activated (applies to Exd or Exi/Exd version of transmitter). For standard or
Exi transmitters, error number E0256 will be displayed and diagnostic alarm mode will be activated de-
pending on the settings I_AL<3,650 mA or I_AL>21,500 mA.
Additionally,
collective
status
SENSOR_FAULT,
PV_OUT_OF_LIMITS,
status
NOREF+ERR@AIN1_AD7794 in the Sensor Block and PV_LOW_LIMITED in the Transducer Block will
be set, which can be read out in the diagnostic tab via HART communication.
8
USAL
"Upper Saturation Limit" - upper limit of the A/D transmitter processing range. The upper limit saturation
point of A/D transmitter is on the pressure/differential pressure scale above the
UPL
point and is associ-
ated with the maximum pressure at which the analogue-digital pressure measurement transmitter reaches
the upper limit of the processing capacity. The exact determination of this pressure is not possible, how-
ever usually the pressure does not exceed the pressure corresponding to 200% of the base range width
(URL-LRL)
above the upper limit of the digital processing of measured
UPL
value. After reaching
USAL
and when above this value, error number E0136 will be displayed on the display and the diagnostic alarm
mode I_AL<3,600 mA will be activated (applies to Exd or Exi/Exd version of transmitter). For standard or
Exi transmitters, error number E0256 will be displayed and diagnostic alarm mode will be activated de-
pending on the settings I_AL<3,650 mA or I_AL>21,500 mA.
Additionally,
collective
status
SENSOR_FAULT,
PV_OUT_OF_LIMITS,
status
NOREF+ERR@AIN1_AD7794 in the Sensor Block and PV_HIGH_LIMITED in the Transducer Block will
be set, which can be read out in the diagnostic tab via HART communication.
9
AL_L
Low current alarm.
10
AL_H
High current alarm.
11
I_AL
The alarm current set by the transmitter controller in the current loop.
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