Chemtrac HydroAct HA4, Руководство пользователя

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56 Chapter 3. Sensors
3.1.4.17 Parameter Flags
The parameter flags show the state of an individual parameter of a particular sensor. These flags can
either be active or not. To see the state of these parameter flags, select:
Options
→
Device Flags
→
Parameter Name
Flags that are active are shown in black text on a white background, those that are not active are
grayed out. Available flags are:
Alarm 1 active The first parameter data alarm is active and triggered.
Alarm 2 active The second parameter data alarm is active and triggered.
Averaging enabled The value displayed for this parameter is averaged.
Threshold 1 active The first parameter threshold is active and triggered.
Threshold 2 active The second parameter threshold is active and triggered.
3.1.4.18 Alarms and Thresholds
Alarms are the means by which values obtained from sensors cause visible, audible or physical actions
to occur. Alarms are not to be confused with relays. An alarm in a HydroAct 4 unit will create a visible
bar across the top of the screen and sound a buzzer. One flow alarm per sensor and two data alarms
per parameter are available.
Thresholds are similar to alarms except that they are events that are supposed to occur and
therefore will not cause the instrument to go into “Alarm”. Thresholds are most frequently used to
trigger relays to cause something to happen when a parameter reaches a value.
To access the alarm and threshold configuration select:
Options → Alarms & Thresholds → Parameter Name
The display has a tab for each alarm and threshold. Navigate to the tab using the right and left
buttons indicated on the bottom of the display or navigate through the settings using the up and down
arrows. Options are:
Enabled Selecting this option turns the alarm/threshold on or off.
Set The Value is used to trigger the alarm or threshold
7
. The Delay is the amount of time the value
has to exceed the set value before the alarm/threshold is triggered.
Reset The Value is used to clear the alarm or threshold. The Delay is the amount of time the value
has to exceed the reset value before the alarm/threshold is cleared.
3.1.4.19 Connections
As the HydroAct 4 is a modular system the exact wiring details will be specific to each order. Electrical
connections required can be viewed by selecting:
Options
→
Connections
7
A set value above a reset value will result in a rising alarm. A set value below a reset value will result in a falling alarm.