Vaisala BAROCAP PTB330 Guia do Utilizador descarregar pdf (Página 92)

User's Guide ______________________________________________________________________

90 __________________________________________________________________ M210855EN-C

0610-076

Figure 41 Relay Output Modes

Mode 4 is usually used if an alarm needs to be triggered when the

measured value exceeds a safe range. The relay is active when

measurement is in range, and is released if the value goes out of range

or the measurement fails.

Hysteresis

The hysteresis function prevents the relay switching back and forth

when the measured value is near to the setpoint values.The relay is

activated when the measured value passes the exact value of the

setpoint. When returning to and passing through the setpoint again, the

relay is not released before the value reaches the setpoint increased/

decreased by the hysteresis value, see Figure 41 on page 90. The

hysteresis should be smaller than the difference of the setpoints.

NOTE

If the measurement of the selected quantity fails or the barometer loses

its power, the relay is released.

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Vaisala BAROCAP PTB330 Guia do Utilizador Página 92