Vaisala DRYCAP DMT346 Betriebsanweisung PDF herunterladen (Seite 94)

User's Guide _______________________________________________________________________

92 ___________________________________________________________________ M210762EN-A

Hysteresis

Hysteresis function is to prevent the relay switching back and forth

when measured value is near to the setpoint values.

Relay is activated when the measured value passes the exact value of

the setpoint. When returning and passing the setpoint again relay is

released only until the value reaches the setpoint increased/decreased

by the hysteresis value.

Hysteresis should be smaller than difference of the setpoints.

Example:

When the 'active above' value is 50 ºC and the hysteresis value is 2 ºC,

relay activates when the relative humidity reaches 50 ºC. As the

humidity then decreases, relay releases at 48 ºC.

>rsel tdf ts

Rel1 Tdf above: 0.00 'C ? 50

Rel1 Tdf below: 0.00 'C ? -

Rel1 Tdf hyst : 0.00 'C ? 2

Rel1 Tdf enabl: OFF ? on

Rel2 Ts above: 0.00 'C ? 80

Rel2 Ts below: 0.00 'C ? 60

Rel2 Ts hyst : 0.00 'C ? 1

Rel2 Ts enabl: OFF ? on

NOTE

If both setpoints are specified and "above" setpoint is lower than

"below" setpoint, the hysteresis works in the opposite direction, that

is, relay is released when the measured value passes the exact value

of the setpoint.

Relay Indicating Transmitter Error

Status

You can set a relay to follow the operation status of the device. By

selecting FAULT/ONLINE STATUS for output quantity a relay

changes state on the basis of the operation status as follows:

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Vaisala DRYCAP DMT346 Betriebsanweisung Seite 94