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f) Pressure Alarm Action Latch (Tabular entry)
The Pressure Alarm Action Latch settings control the Latch features. If SSR output is
assigned to the Pressure Alarm event, in some cases the Pressure Alarm Latch feature
may be desirable.
The following settings are available: Enabled or Disabled. By default, the Pressure
Alarm is non-latching, which means that the Alarm action is indicated only while the
monitored Pressure reading value exceeds the specifi ed conditions that have been set.
6.4.12 Submenu "Gas Temperature Alarm"
The DPC provides the user with a fl exible Alarm system that monitors the Fluid Temperature
for conditions that fall outside confi gurable limits and provides visual feedback for the user
via the OLED, status LED or an SSR output. The Temperature Alarm has several attributes
which may be confi gured by the user via the OLED/joystick interface or digital communica-
tion interface. These attributes control the conditions which cause the Alarm to occur and
specify actions to be taken when the temperature reading rate is outside the specifi ed condi-
tions.
Temperature Alarm conditions become true when the current temperature reading is equal
to, or higher or lower than, corresponding values of High and Low Temperature Alarm levels.
Alarm action can be assigned with preset Delay Interval (0-3600 seconds) to activate the
SSR output. The Latch Mode control feature allows SSR output to be latched on or follow
the corresponding Alarm status.
Following settings are available for Temperature Alarm (see Figure 19):
a) Temperature Alarm Mode (Tabular entry)
This function determines whether the Temperature Alarm is Enabled or Disabled.
Two selections are available: Enabled or Disabled. The default entry is Disabled. Alarm
Mode selections can be set with the Joystick UP and DN buttons and are accepted by
pressing the joystick equivalent of an ENT button.
b) Low Temperature Alarm (Numerical entry)
The limit for the Low Temperature Alarm value can be entered in currently selected
temperature units, in increments of 0.1 degree within the range of -20 °C to 69.9 °C.
If a Low Alarm occurs, and SSR output is assigned to the Low Temperature Alarm
event (see Section 6.4.15.6), the SSR output will be activated when the temperature is
lower than the preset Low Temperature Alarm value.
The Low Temperature Alarm condition is also indicated on the corresponding Process
Information Screen by alternating every second between units of measure and the “L”
alert, meaning Low.
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