Emerson 3051S Especificações descarregar pdf (Página 89)

Reference Manual

00809-0100-4803, Rev DA

Section 3: Configuration

April 2013

Configuration

Figure 3-38. Variables - analog output tab

1. Select the Primary Variable under the Analog Output Setup heading. The Upper Range

Value and Lower Range Value may also be edited under this heading.

2. Verify the Upper Sensor Limit and Lower Sensor Limit and minimum span under the

Primary Variable Sensor Limits heading.

Transfer function (Direct process variable output feature board

only)

The 3051S MultiVariable Transmitter with Direct Process Variable Output Feature Board has two

analog output settings: Linear and Square Root. Activate the square root output option to make

analog output proportional to flow. As input approaches zero, the 3051S MultiVariable

Transmitter automatically switches to linear output in order to ensure a smooth, stable output

near zero (see Figure 3-39 on page 64).

From 0 to 0.6 percent of the ranged pressure input, the slope of the curve is unity (y = x). This

allows accurate calibration near zero. Greater slopes would cause large changes in output (for

small changes at input). From 0.6 percent to 0.8 percent, curve slope equals 41.72 (y = 41.72x)

to achieve continuous transition from linear to square root at the transition point.

Note

Do not set both the analog output of the device and the control system to square root.

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 187 188

Sem comentários

Emerson 3051S Especificações Página 89