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On the gauge, AH indicates a high liquid level alarm, while AL indicates a low liquid level alarm. So what does SL represent?
Install remote level gauges and on-site level gauges; set high and low alarms for the level, as well as a low-low alarm, which triggers interlock 0302 when activated
The high and low level alarms in the DCS system are linked to the SIS system for interlock at the lower limits.
Is SL a low-low alarm with interlock?
SL low-low alarm, go to SIS?
Why isn’t a low report considered ALL?
SL is a low liquid level interlock, which sends an interlock signal when the liquid level reaches the low limit, thereby activating the interlock I-0302.