Vaisala PTB330 Manuel d'utilisateur télécharger pdf (Page 95)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 93

DELETE/UNDELETE

Use the serial line to clear or restore the data files.

Use the

DELETE command to clear all data files. Use the

UNDELETE command to recover the deleted data.

NOTE

The UNDELETE command only recovers the part of the deleted data

that has not been recorded over yet.

Operating Relays

Quantity for Relay Output

A relay monitors the quantity chosen for the relay output. Any of the

quantities available can be chosen.

Measurement-Based Relay Output

Modes

Relay Setpoints

When the measured value is in between the "above" and "below"

values, the relay is passive. When choosing lower value as "above"

value and higher value as "below" value, the relay is passive when the

measured value is not between the setpoints. You can also set only

one setpoint. See Figure 39 on page 94 for illustrative examples of the

different m

easurem

ent-based relay output modes.

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Vaisala PTB330 Manuel d'utilisateur Page 95