Emerson MICRO MOTION 2700 Manual de Instalação descarregar pdf (Página 103)

Transmitter Configuration and Use: Series 1000 and 2000 Transmitters 93

Optional Configuration continued

Required Configuration Optional ConfigurationUsing the TransmitterFlowmeter Startup

Slug flow parameters are as follows:

• Low slug flow limit – the point below which a condition of slug flow will exist. Typically, this

is the lowest density point in your process’s normal density range. Default value is 0.0 g/cm

;

range is 0.0–10.0 g/cm

• High slug flow limit – the point above which a condition of slug flow will exist. Typically, this

is the highest density point in your process’s normal density range. Default value is 5.0 g/cm

;

range is 0.0–10.0 g/cm

• Slug flow duration – the number of seconds the transmitter waits for a slug flow condition

(outside the slug flow limits) to return to normal (inside the slug flow limits). If the transmitter

detects slug flow, it will post a slug flow alarm and hold its last “pre-slug flow” flow rate until

the end of the slug flow duration. If slugs are still present after the slug flow duration has

expired, the transmitter will report a flow rate of zero. Default value for slug flow duration is

0.0 seconds; range is 0.0–60.0 seconds.

Note: Raising the low slug flow limit or lowering the high slug flow limit will increase the possibility

of slug flow conditions.

Note: The slug flow limits must be entered in g/cm

, even if another unit has been configured for

density. Slug flow duration is entered in seconds.

8.12 Configuring fault timeout

By default, the transmitter immediately reports a fault when a fault is encountered.

You can configure the transmitter to delay reporting a fault by changing the fault

timeout to a nonzero value. During the fault timeout period, the transmitter

continues to report its last valid measurement.

Note: Although some communication tools allow you to configure the fault timeout

in two locations, only one value is stored. If you change the fault timeout in one

location, the value displayed on the other location is changed.

8.13 Configuring meter factors

Meter factors allow you to modify the transmitter’s output so that it matches an

external measurement standard. Meter factors are used for proving the flowmeter

against a Weights & Measures standard. You may need to calculate and configure

meter factors periodically to comply with regulations.

You can adjust meter factors for mass flow, volume flow, and density. Only values

between 0.8 and 1.2 may be entered. If the calculated meter factor exceeds these

limits, contact Micro Motion Customer Service.

8.13.1 Calculating meter factors

Use the following formula to calculate a meter factor:

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

• Model 1500 AN

• Model 1700 AN

• Model 1700 IS

• Model 2500 CIO

• Model 2700 AN

• Model 2700 IS

• Model 2700 CIO

NewMeterFactor ConfiguredMeterFactor

ExternalStandard

ActualTransmitterMeasurement

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