Practical-instrument-electronics 820-ELITE Manual do Utilizador descarregar pdf (Página 17)

Page 15

READ

PWR MEASURE

28.20

SOURCE

SET

OFF

MAX

READ

MIN

READ

OVERLOAD

Hz SYNC

Double Click

Push & Turn

for

Fast Dialing

Push & Hold

Store/Step

mA ∙ V ∙ pH ∙ TC ∙ Ω ∙ RTD ∙ Freq ∙ Pressure

Typical

2-Wire

Transmitter

+ IN - REF +OUT-

Transmitter Input

Sensor

Process Signal

Simulated Input

SOURCE

SET

MAX

READ

MIN

READ

Power/Measure mA, Power/Measure % (Percent of 4 to 20 mA)

Choose this function to simultaneously supply power to a 2 Wire

Transmitter while displaying the 4.000 to 20.000 mA output of

the transmitter.

Move the power switch

w to READ then Double Click the

EZ-DIAL knob to get into the Double Click Menu. Turn the knob

e to scroll through the settings and press the knob to make your

selection. Select mA for the FUNCTION and PWR MEAS for the

MODE. Choose either mA or % and whether you need the 250Ω

HART resistor active in the loop.

Disconnect one or both input wires from the device to be

calibrated. Connect the red source lead of the PIE 820-ELITE to

the plus (+) input of the device and the black source lead to the

minus (-).

The PIE 820-ELITE supplies a nominal 24 volts DC at 24 mA to

the 2 Wire Transmitter. The current passed by the transmitter will

be accurately displayed by the PIE 820-ELITE. Calibrate the

transmitter in the usual manner and disconnect the PIE

820-ELITE. Signals above 24 mA are current limited by protection

circuitry with “OVERRANGE” flashed on the display and the red

OVERLOAD LED lit.

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