Endress+Hauser RIA15 - Page 38

Commissioning RIA15
38 Endress+Hauser
Expert menu (EXPRT); a code must be entered
In addition to all the parameters in the Setup menu, the Expert menu also contains the parameters
described in this table. If you call up the Expert menu, you will be asked to enter the user code (UCODE,
default: 0000).
Parameters Values visible at Description
CURV LINAR
SQRT
Use this to select the calculation function for
the process value (for MODE = 4-20)
LINAR (scaling with SC__4 and SC_20):
Process value = (mA value - 4)/16 * (SC_20 -
SC__4) + SC__4 + OFFST
SQRT (square root extraction and scaling):
Process value = Square root((mA value - 4)/16)
* (SC_20 - SC__4) + SC__4 + OFFST
Negative values when calculating the square root
are set to 0.
Use this to select the calculation function for
the HART1 value (PV) (for MODE = HART)
LINAR:
HART1 value (PV) = "exported PV value" * FACT1
+ OFFS1
SQRT (square root extraction and scaling with
BGLO1 and BGHI1):
HART1 value (PV) = (square root("exported
percentage PV value" / 100) * (BGHI1 - BGLO1)
+ BGLO1) * FACT1 + OFFS1
Negative values when calculating the square root
are set to 0.
Example for SQRT:
• exported percentage PV value = 50
• BGLO1 = 100.0
• BGHI1 = 200.0
• FACT1 = 1
• OFFS1 = 0.0
HART1 value (PV) = (square root(50/100) *
(200 - 100) + 100) * 1 + 0 = 170.7
NAMUR NO
YES
MODE =
4-20
Use this function to define the error limits in
accordance with standard NAMUR NE 43
→  41
RNGLO Numerical value NAMUR =
NO
Lower range limit. An error message is displayed
if the measured current falls below this limit.
RNGHI Numerical value NAMUR =
NO
Upper range limit. An error message is displayed
if the measured current exceeds this limit.
OFFST Numerical value
–19 999 to 99 999
MODE =
4-20
Use this function to enter an offset value to
display the measured value.
FACT1-FACT4 1E-6
1E-5
1E-4
1E-3
1E-2
1E-1
1
1E1
1E2
1E3
1E4
1E5
1E6
MODE =
HART
As the display is limited to 5 characters, the
measured value must be multiplied by a factor if
necessary.
For example: conductivity 0.00003 S multiplied
by factor 1E6 Þ 30.000 µS.

If a factor is used, it is recommended to set
the unit under UNIT1-4 to "UNIT" and to
enter user-defined text because the unit
automatically delivered via HART® no
longer matches the displayed value.
OFFS1-OFFS4 Numerical value
–19 999 to 99 999
MODE =
HART
Use this function to enter an offset value to
display the HART1-HART4 measured value.
If a factor is used, the offset is added to the
multiplied value (displayed value = measured
value*factor + offset)