If the measurement you are using to control the relay is likely to move back and forth close to the activation setpoint, you can set a hysteresis that prevents the relay switching on and off too frequently.
When hysteresis is used, the relay activates at the defined limit, but does not switch off immediately when the measurement moves back to the other side of the activation limit. Instead, with hysteresis, the relay remains active until the measurement reaches the defined tolerated variation limit.
- Open the menu in the wireless configuration interface.
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In the Relays menu, select the relay activation mode from the
Output Mode dropdown menu:
- Select Active above trigger level if you want the relay to activate when the probe measurement exceeds a set limit
- Select Active below trigger level if you want the relay to activate when the probe measurement falls below a set limit
- Select the measurement parameter that is used to control the relay with the Parameter dropdown.
- Set the unit of the measurement parameter with the Unit dropdown.
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Enter the relay activation limit either to the Low Trigger Level
or the High Trigger Level field:
- If you are using Active above trigger level (relay activation when the measurement exceeds a set limit), enter the limit to the High Trigger Level field.
- If you are using Active below trigger level (relay activation when the measurement falls below a set limit), enter the limit to the Low Trigger Level field.
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To define the hysteresis value:
- Select the Error State for the relay.