• It flashes if the internal temperature is close to the set point.
• It remains off if the internal temperature exceeds the set point.
Figure 3-7: Right Side of the I/O Module
23. -5 - Regulated -5 Vdc supply LED: This dim, green LED confirms the presence
of the -5 Vdc power supply.
24. +5 - Regulated +5 Vdc supply LED: This dim, green LED confirms the
presence of the +5 Vdc power supply.
25. OK - System status indicator LED: This green LED confirms that the Hydran
201Ti is operating properly and that the fail alarm relay is energized. It turns
off if a fail alarm condition is detected and if the fail alarm relay is de-
energized.
26. HH - High-High alarm LED: This red LED is lit when a High-High alarm
condition is detected and the High-High alarm relay is energized.
27. H - High alarm LED: This red LED is lit when a High alarm condition is
detected and the High alarm relay is energized.
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