Vaisala PTB330 - Manual (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 measurement-based relay output modes.