Yokogawa HIMHART Manual de usuario descargar pdf (Pagina 17)

The Interface Solution Experts 17

HIM

Smart HART



Loop

Interface and Monitor

Configuring Analog Output Trimming

The

Analog Output Trimming

section of the software

allows you to match the HART monitors analog output

to the output measured by a calibration device. This

will require a calibrated multimeter, such as a HP Model

3478A or equivalent, accurate to ±0.009%.

Note:

Trimming the analog output of the monitor

nullifies any scaling that may have been

performed in the

Scaling

tab.

User Trimming

To trim the device, attach a multimeter to the analog

output, then click the

Fix Output at Low Point

button.

Read the value on the multimeter, enter it into the

Measured Output Loop Current

portion of the

Trimming

box, and press

Trim

. Repeat this sequence until the

analog output matches the minimum point (4mA for a

4-20mA output) when you click the

Fix Output at Low

Point

button.

After the low point is trimmed, press the

Fix Output at

High Point

button. Read the value on the multimeter,

enter it into the

Measured Output Loop Current

portion

of the

Trimming

box, and press

Trim

. Repeat this

sequence until the analog output matches the

maximum point (20mA for a 4-20mA output) when you

click the

Fix Output at High Point button

When finished, press the

Unfix Output

button.

Figure 13. Trimming Window

Fix Current Utility

The

Fix Current Utility

allows you to force the HIM to

output any current value from 0-20mA. This can be

used to match the calibration of your other equipment.

To fix the current, simply enter the value in the

Current

box (in mA) that you want the HIM to output, and click

Fix Output

. When you are finished, make sure to

press the

Unfix Output

button so that the HIM can

return to normal operation.

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