Practical-instrument-electronics 850 Uživatelský manuál stáhnout pdf (Strana 22)

Page 20

Preliminary

The PIE 850 is supplying

the loop voltage. There is a

control loop error. This may

be a transmitter (set for

upscale burnout) with a

bad or missing sensor, or a

short in the loop.

The PIE 850 is supplying

the loop voltage. A

calibrated transmitter is

limiting the loop current to

12.00 mA. An additional

0.28 mA is not controlled

by the transmitter and is

leaking somewhere in the

loop.

PWRM LEAK

00.28 mA

12.280 mA

Typical Error Conditions

Typical

2-Wire

Transmitter

+ IN - REF +OUT-

Transmitter Input

Sensor

Process Signal

Simulated Input

12.280

PROCESS

INDICATOR

12.280mA

PWRM LEAK

5 6

00.28 mA

Using Ground Leak Detection

PWRM LEAK

OVER RANGE

Note: Many installed transmitters will normally indicate 0.01 to

0.02 mA leakage without significant control problem. Unstable

readings may indicate loose connections or the presence of

moisture.

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