Doric Instruments 5000D Digital Process Indicator and Miniature Datalogger - Manual (Page 19)

18
- Pressing and holding the Arrow key and pressing
the PGM key resets Relay 1 (ALM1).
- Pressing and holding the Arrow key and pressing
the ENT key resets Relay 2 (ALM2)
Note: When the Viewer Software is being used, the
front panel keys are disabled. Relays must therefore
be reset using the Unlatch buttons on the Viewer
control panel.
When HIGH is selected, a temperature greater than
or equal to the limit value will cause an alarm. When LOW is
selected, a temperature less than or equal to the limit value
will cause an alarm.
Using Deviation
Deviation allows the user to assign alarm limits above and
below the normal operating points of a process. If the
temperature remains within the high and low deviation
setpoints no alarm occurs. If the temperature equals or
exceeds either the high
or low deviation limits an alarm
occurs. Hysteresis and delay are also programmable for
deviation setpoints (see
following explanations). Deviation
allows the user to assign two setpoints per alarm relay for a
total of four alarm setpoints per alarm option (See drawing
below). This could be useful for indicating a warning
condition with one relay and an emergency condition for the
other relay.