Micro Motion RFT9709 Instrukcja Obsługi Pobierz pdf (Strona 80)

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Informational indicators

"Raw Flow Overflow" and

"Raw Elec. Zero Overflow"

Raw Flow Overflow and Raw Elec Zero Overflow switch ON to indicate

the transmitter cannot calculate flow. If there are no open circuits in the

sensor wiring, the sensor is being subjected to mounting stress or

external noise.

If Raw Flow Overflow or Raw Elec Zero Overflow switches ON, eliminate

mounting stress on the sensor, and isolate the sensor from vibration and

mechanical noise.

7.5 Informational indicators

Informational indicators switch on to indicate the following changes in

operating states:

• Transmitter start-up, calibration, zeroing, and testing

• Polling address other than 0 assigned to the transmitter for HART

communication in a Bell 202 multidrop network

• Cancel chosen during an output calibration or test

• Transmitter configured to send data in burst mode under HART

protocol

• An event assigned to an RFT9739 output achieves the setpoint

• An interruption or error occurs in analog input

Table 7-8

, page 68 summarizes conditions indicated by informational

indicators.

Example:

Given:

An RFT9739 is configured to indicate flow rate in pounds per

minute (lb/min). The frequency/pulse output has been scaled so that

100 Hz = 1 lb/min. The frequency/pulse output goes out of range at

15 kHz.

Problem:

When the process flow rate exceeds 150 lb/min, the

frequency/pulse output is saturated.

Solution:

Increase the flow rate represented by the output at 15 kHz by

rescaling the frequency/pulse output so that 100 Hz = 2 lb/min (the

output will be saturated at 300 lb/min).

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Micro Motion RFT9709 Instrukcja Obsługi Strona 80