Emerson 3051S Dokumentacja Pobierz pdf (Strona 64)

Reference Manual

00809-0100-4001, Rev JA

Section 3: Configuration

November 2012

Configuration

Note

Transmitters are shipped from Emerson Process Management fully calibrated per request or by

the factory default of full scale (zero to upper range limit).

Note

Regardless of the range points, the 3051 will measure and report all readings within the digital

limits of the sensor. For example, if the 4 and 20 mA points are set to 0 and 10 inH

O, and the

transmitter detects a pressure of 25 inH

O, it digitally outputs the 25 inH

O reading and a 250%

of range reading.

Select from one of the methods below to rerange the transmitter. Each method is unique;

examine all options closely before deciding which method works best for your process.

 Rerange with a Field Communicator or AMS Device Manager only.

 Rerange with a pressure input source and a Field Communicator or AMS Device

Manager.

 Rerange with a pressure input source and the local zero and span buttons (option D4).

Note

If the transmitter security switch is ON, adjustments to the zero and span will not be able to be

made. Refer to “Configure security and alarm” on page 20 for security information.

Rerange with a Field Communicator or AMS Device Manager Only.

The easiest and most popular way to rerange is to use the Field Communicator only. This

method changes the range values of the analog 4 and 20 mA points (1 and 5 Vdc points)

independently without a pressure input. This means that when you change either the 4 or 20

mA setting, you also change the span.

An example for the 4-20 mA HART output:

If the transmitter is ranged so that

4 mA = 0 inH

O, and

20 mA = 100 inH

and you change the 4 mA setting to 50 inH

O using the communicator only, the new settings

are:

4 mA = 50 inH

O, and

20 mA = 100 inH

Note that the span was also changed from 100 inH

O to 50 inH

O, while the 20 mA setpoint

remained at 100 inH

To obtain reverse output, simply set the 4 mA point at a greater numerical value than the 20 mA

point. Using the above example, setting the 4 mA point at 100 inH

O and the 20 mA point at 0

inH

O will result in reverse output.

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 221 222

Komentarze do niniejszej Instrukcji

Brak uwag

Emerson 3051S Dokumentacja Strona 64

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Pomiary, testowanie i kontrola Emerson 3051S