Micro Motion RFT9709 Manual de instrucciones descargar pdf (Pagina 127)

Using ProLink

Software with Micro Motion

Transmitters

113

Configure Menu: Transmitter Outputs

continued

Milliamp outputs

Configure Menu:

Transmitter Outputs

Configure Menu:

Transmitter Information

Configure Menu: EventsView Menu: Status

Configure Menu:

Characterize

Configure Menu:

Transmitter Variables

The IFT9701 4-20 mA output can indicate mass flow or volume flow.

• To select variables indicated by the IFT9701 or RFT9703 mA output,

choose a mass or volume flow unit from the Configure Transmitter

Variables dialog box.

• The flow unit that is chosen determines whether the IFT9701 4-20

mA output will represent mass flow or volume flow.

• To choose a mass or volume flow unit, see

Section 9.2

(page 93).

The RFT9712 and RFT9729 4-20 mA output can indicate mass flow,

volume flow, density, or temperature.

• To select variables indicated by the RFT9712 or RFT9729 mA output,

use the drop-down list box under Milliamp 1.

• If Mass Flow is chosen, the type of flow (mass or volume) indicated

by the output is dependent on the flow unit of measure that was

selected in the Configure Transmitter Variables dialog box.

• To choose a mass or volume flow unit of measure, see

Section 9.2

(page 93).

Range limits

Use the 4 mA and 20 mA text boxes to program the range of process

variables assigned to milliamp outputs. The range represents values of

the variable at 4 mA and 20 mA if the output produces a 4-20 mA

current, or at 0 mA and 20 mA if the output produces a 0-20 mA current.

Low Limit, High Limit, and Minimum Span, displayed at the bottom of the

dialog box, indicate sensor limits in the measurement units established

for milliamp output variables.

• The value entered into the 4 mA text box must be lower than the

value entered into the 20 mA text box.

• The value entered into the 20 mA text box must be higher than the

displayed low limit and lower than the displayed high limit.

• The difference between the values entered into the text boxes must

be greater than the displayed minimum span.

Milliamp output flow

cutoffs for RFT9739 and

RFT9712/RFT9729

If the configuration applies to an RFT9739, RFT9712, or RFT9729, enter

flow cutoffs for milliamp outputs into the Cutoff text boxes. Flow cutoffs

enable the user to filter out noise by defining the level below which

milliamp outputs will indicate zero flow.

If a milliamp output indicates mass flow or volume flow, the user can

define a flow cutoff for the output. A flow cutoff is the lowest flow rate at

which the milliamp output indicates nonzero flow. If the flow signal drops

below the flow cutoff, the output goes to the current level that indicates

zero flow.

Flow cutoffs for milliamp outputs remain unaffected by the flow cutoff for

the transmitter frequency/pulse output and internal totalizers. To assign

a flow cutoff to the frequency/pulse output and internal totalizers, use the

Configure Transmitter Variables dialog box.

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Micro Motion RFT9709 Manual de instrucciones Pagina 127

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