Owner manual

Set Point
Deviation
normally
closed
Deviation
normally
open
Process
normally
closed
Process
normally
open
Non-Alarm State
LED off
Alarm Output:
Alarm State
LED on
Alarm Output Status:
Function
A deviation alarm
tracks set point.
A process alarm
is a fixed value,
independent
of set point.
Alarm High Region
Alarm Low Region
Safe
Area
Safe
Area
Alarm Type
Alarm Hysteresis is the change in the process variable (actual)
required to clear the alarm relay after an alarm occurs.
Alarm High Region
Alarm Low Region
0
Silenced-Alarm State
LED off
Alarm Output Status:
Power-Off State
LED off
Alarm Output Status:
Deviation Alarm Process Alarm
Watlow Series 935B User’s Manual 27
Table 10 - Alarm Functions
Note: With no power connected to the unit, the alarm output will be in an open state.
• To Clear an Alarm that is latched or “silence-able’ requires the operator to press the ß key after
the process returns to a safe, or non-alarm condition. Non-latching alarms self-clear. See Table 11:
[`LAt] and [`SIL], p. 29.
Table 10 (below) and Table 11 (p. 29) illustrate the Series 935B alarm features.
[denc]
[deno] [prnc]
[prno]
[ahy5]
[ahy5]
[alty]
[ahty]
[ahy5]
[ahy5]
[`al0]
[`al0]
[`ah1]
[`ah1]