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52 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Inputs
Temperature parameters
Temperature parameters are listed and defined in Table 7-10.
Damping
A damping value is a period of time, in seconds, over which the process variable value will change to
reflect 63% of the change in the actual process. Damping helps the transmitter smooth out small,
rapid measurement fluctuations:
• A high damping value makes the output appear to be smoother because the output must change
slowly.
• A low damping value makes the output appear to be more erratic because the output changes
more quickly.
You can change the damping values for flow (mass and volume), density, and temperature.
When configuring damping values, note the following:
• Liquid volume flow is derived from mass and density measurements; therefore, any damping
applied to mass flow and density will affect liquid volume measurement.
• Gas standard volume flow is derived from mass flow measurement, but not from density
measurement. Therefore, only damping applied to mass flow will affect gas standard volume
measurement.
• You can also configure damping specifically for the milliamp outputs (see Section 8.4.4
). If
damping is configured for flow, density, or temperature, the same process variable is assigned
to a milliamp output, and added damping is also configured for the milliamp output, the effect
of damping the process variable is calculated first, and the added damping calculation is
applied to the result of that calculation.
Be sure to set damping values accordingly.
When you specify a new damping value, it is automatically rounded down to the nearest valid
damping value. Flow, density, and temperature have different valid damping values.
Valid damping values are listed in Table 7-11.
Table 7-10 Temperature parameters
Variable Default Description
Temperature units degC • Select °Celsius, °Fahrenheit, °Rankine, or °Kelvin.
• Temperature outputs and displays will indicate temperature in the selected
unit.
Temperature damping 4.8 sec • Damping filters out noise or the effects of rapid changes in temperature
without affecting measurement accuracy. See the section entitled Damping
later in this chapter. Range is 0.0–38.4 seconds.
• Milliamp outputs have an additional damping parameter. See Section 8.4.4.
Table 7-11 Valid damping values
Process variable Valid damping values
Flow (mass and volume) 0, .2, .4, .8, ... 51.2
Density 0, .2, .4, .8, ... 51.2
Temperature 0, .6, 1.2, 2.4, 4.8, ... 38.4