Siemens SITRANS L Pointek ULS200 Manual de Instruções - Página 20

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1. Startup

5.4.5

Relay deadband (reset)

Deadband (hysteresis) prevents relay chatter due to material level fluctuations at the set

point. These fluctuations are often waves or turbulence on a fluid's surface caused by

agitators in the tank. Once a relay is tripped, the detection level must move beyond the

deadband value before it is reset. The direction in which the deadband is measured depends

on the application of the relay. If the relay is for a high state then the deadband is measured

below the set point. If the relay is for a low state then the deadband is measured above the

set point. Refer to the diagram below. Deadband 1 is used for Relay 1 and Deadband 2 is

used for Relay 2. The deadband value is entered in the units selected, and applies to both

relays and all alarm or control functions except 'Loss Of Echo'.

Factory setting: 0.05 m (0.16 ft)

①

②

③

④

⑤

Off

Deadband

On setpoint

Low/low-low alarm

High/high-high alarm

Operating Instructions, 01/2019, A5E32268616-AB

Pointek ULS200