Micro Motion RFT9709 Manual de Instruções descarregar pdf (Página 130)

116

Using ProLink

Software with Micro Motion

Transmitters

Configure Menu: Transmitter Outputs

continued

Slug duration for RFT9739

Configuring fault

indicators for a Version 2

or earlier RFT9739

If the RFT9739 is a Version 2 or earlier model, open the Fault Indicator

list box to select from four fault indicators for milliamp outputs and the

frequency/pulse output from the RFT9739. On field-mount transmitters,

regardless of the fault indicator that is chosen, the transmitter diagnostic

LED blinks 4 times per second to indicate a fault condition.

Downscale

Milliamp outputs go to 0 mA if they produce a 0-20 mA current, or to

2 mA if they produce a 4-20 mA current; the frequency/pulse output

goes to 0 Hz.

Upscale

Milliamp outputs go to 22 mA; the frequency/pulse output goes to

15 kHz.

Last measured value

Outputs hold the values measured immediately before the fault condition

occurred.

Internal zero

If the user has scaled a milliamp output so it represents zero flow at

some setting above the minimum 0 mA or 4 mA current level, the output

goes to the scale setting that represents zero flow. The frequency/pulse

output goes to 0 Hz.

10.5 Slug duration for RFT9739

After using the Characterize dialog box to program slug flow limits (see

Section 8.5

, page 81), open the Transmitter Outputs dialog box to set a

slug duration for the RFT9739. At the Slug Duration text box, enter the

desired slug duration in seconds.

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

If the slug flow condition ceases in less than one minute, the RFT9739

can continue holding the last accurately measured flow value until

process density stabilizes within the programmed slug flow limits. The

slug duration specifies the amount of time the transmitter indicates the

last measured flow value before indicating zero flow.

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Micro Motion RFT9709 Manual de Instruções Página 130