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68 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Outputs
LRV and URV
Each process variable that can be assigned to a milliamp output has its own 20 mA and 4 mA value
(URV and LRV). If you assign a different process variable to a milliamp output, the corresponding
LRV and URV are loaded and used. Default LRV and URV settings are listed in Table 8-6.
Table 8-5 Calibration span variables
Variable Default Description
20 mA Sensor limit for selected
process variable
(Upper range value, or URV) Enter the value the output will
represent at 20.0 mA. See the section entitled LRV and URV.
4 mA (Lower range value, or LRV) Enter the value the output will represent
at 4.0 mA. See the section entitled LRV and URV.
Low flow cutoff
(1)
(1) For most applications, the Low Flow Cutoff default value is used. Contact Micro Motion customer service before changing the Low
Flow Cutoff parameter.
0.0 for all flow variables • If a flow variable is assigned to the output, the low flow cutoff is the
flow rate below which the output will indicate zero flow.
• If the value entered here is less than the value configured for mass
or volume low flow cutoff, this value will have no effect. See the
section entitled Multiple cutoffs.
Damping
seconds
(2)
(2) For most applications, the Damping Seconds default value is used. Contact Micro Motion customer service before changing the
Damping Seconds parameter.
0 sec • Select the amount of added damping for the milliamp output.
• Damping is added to damping that has been configured for flow,
density, or temperature. See the section entitled Multiple damping
parameters.
4.0 mA minimum Not applicable
(read-only)
The lowest value that can be represented by the output, as
determined by sensor limit.
20.0 mA
maximum
The highest value that can be represented by the output, as
determined by sensor limit.
Minimum span The smallest allowable difference between the value represented at
4.0 mA and the value represented at 20.0 mA, as determined by
sensor limit.
Table 8-6 Default LRV and URV
Process variable LRV URV
All mass flow variables –200.000 g/s 200.000 g/s
All liquid volume flow variables –0.200 l/s 0.200 l/s
All density variables 0.000 g/cm
3
10.000 g/cm
3
All temperature variables –240.000 °C 450.000 °C
Drive gain 0.000% 100.000%
Gas standard volume flow –423.78 SCFM 423.78 SCFM
External temperature –240.000 °C 450.000 °C
External pressure 0.000 bar 100.000 bar
Enhanced density concentration 0% 100%
Enhanced density Baume 0 10
Enhanced density specific gravity 0 10