8.3.2 Configure Lower Range Value (LRV) and Upper Range Value
(URV) for the mA Input
Display
Menu
>
Configuration
>
Inputs/Outputs
>
Channel D
>
I/O Settings
>
Lower Range Value
Menu
>
Configuration
>
Inputs/Outputs
>
Channel D
>
I/O Settings
>
Upper Range Value
ProLink III
Device Tools
>
I/O
>
Inputs
>
mA Input
>
Range Values
Field Communicator
Configure
>
Manual Setup
>
Inputs/Outputs
>
Channel D
>
mA Input
>
LRV
Configure
>
Manual Setup
>
Inputs/Outputs
>
Channel D
>
mA Input
>
URV
The
Lower Range Value
(LRV) and
Upper Range Value
(URV) are used to scale the mA Input, that is, to define
the relationship between the external variable and the mA Input signal.
LRV
is the value of
mA Input Assignment
represented by an input of 4 mA.
URV
is the value of
mA Input
Assignment
represented by an input of 20 mA. Between
LRV
and
URV
, the mA Input is linear with the process
variable. If the process variable drops below 3.8 mA or rises above 20.5 mA, the transmitter posts an input
failure alert.
Procedure
Set
LRV
and
URV
as desired.
Enter
LRV
and
URV
in the measurement units that are appropriate for
mA Input Assignment
.
•
Defaults: 0
•
Range (in default measurement units):
—
Pressure: 0 PSI to 1000 PSI
—
Temperature: 0 °C to 250 °C
—
Loop current: 4 mA to 20 mA
Note
You can set
URV
below
LRV
. For example, you can set
URV
to
50
and
LRV
to
100
. If you do this, the mA Input
will be inversely proportional to the value of
mA Input Assignment
8.3.3 Configure mA Input Damping
Display
Menu
>
Configuration
>
Inputs/Outputs
>
Channel D
>
I/O Settings
>
Damping
ProLink III
Device Tools
>
Configuration
>
I/O
>
Inputs
>
mA Input
>
mA Input Damping
Field Communicator
Configure
>
Manual Setup
>
Inputs/Outputs
>
Channel D
>
mA Input
>
Damping
mA Input Damping
controls the amount of damping that will be applied to the mA Input.
Damping is used to smooth out small, rapid fluctuations in process measurement. The damping value
specifies the time period, in seconds, over which the transmitter will spread changes in the process variable.
At the end of the interval, the transmitter's internal value will reflect 63% of the change in the actual value
sent by the external device.
mA Input Damping
affects a process variable only when it is received via the mA Input. If the process variable
is read digitally,
mA Input Damping
is not applied.
Integrate the meter with the control system
Configuration and Use Manual
March 2019
MMI-20025166
148
Micro Motion Model 5700 Transmitters with Configurable Outputs