Micro Motion RFT9709 Manuál s instrukcemi stáhnout pdf (Strana 78)

Using ProLink

Software with Micro Motion

Transmitters

View Menu: Status

continued

Operational indicators

To program slug flow limits

, follow these steps. For more information,

see

Section 8.5

, page 81.

1. Open the Configure menu, then choose Characterize.

2. In the Characterize Sensor dialog box, at the Low and High text

boxes in the Slug Flow Limits frame, enter the desired slug flow limits

in grams per cubic centimeter (g/cc).

3. Click OK.

In some applications, slug flow typically occurs for short periods of time.

If slug flow ceases in less than one minute, an RFT9739 can continue

holding the last accurately measured flow value until process density

stabilizes within the programmed slug flow limits. A user-defined slug

duration specifies the amount of time the RFT9739 indicates the last

measured flow value before indicating zero flow. (Some RFT9739

software versions cannot indicate last measured value.)

To program a slug duration for an RFT9739

, follow these steps. For

more information,

Section 10.5

, page 116.

1. Open the Configure menu, then choose Transmitter Outputs.

2. Enter the desired time, from 0.00 to 60.00 seconds, into the Slug

Duration text box.

3. Click OK.

Analog and frequency

saturated indicators

If an output variable exceeds its upper range limit, a frequency saturated

or analog saturated indicator switches ON. The indicator can mean the

output variable has exceeded appropriate limits for the process, or the

user needs to change measurement units.

Analog output saturated

If Analog 1 Saturated, Analog 2 Saturated, or Analog Output Saturated

switches ON, open the View menu, then choose Output Levels to open

the Output Levels window.

If the output variable is outside control limits:

use a control device to

decrease the flow rate, density, temperature, or pressure of the fluid.

If the output variable is within control limits:

set the flow loop for

manual operation, then follow one of the procedures described below to

change the span of the milliamp output.

• Rescale the milliamp output by adjusting the 4 mA and/or 20 mA

range limit: Open the Configure menu, then choose Transmitter

Outputs. 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.

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