Prosense PQ Series User Manual page 6

Please select the alarm level you would like to adjust and press Enter key to see details. All
alarm details will be listed in new screen and parameters will be blinking one by one while you
set the values.
The first digit of the first alarm will start blinking to let you increase or decrease the digit via
using up and down keys. When you set the value, press again Enter key to move next digit.
The next digit will start blinking to allow you set desired value. When you complete, press
Enter key long enough. The display will show "Successful" message and return back to higher
level menu.
All alarm levels have same parameter that user can adjust if needed. Otherwise they will work
with their default settings. The meaning of parameters is as follows:
Level: The measurement level to raise the alarm
Auto-reset: Define how the alarm relays will work. If 'YES' selected the relay will be released
once the measurement level returned to normal. If 'NO' selected the relay will lock in their
position. According to IEC EN 60079-29-1 highes level alarm "Alarm-2" is set to latch mode
without auto-reset.
Directions: Parameter to define in which way alarm will be activated whether increasing or
decreasing. For most toxic and flammable gases it will be raising, for oxygen it can be both
raising and falling.
Relay: It defines the alarm relay working conditions. Relays can be programmed as Energised
(NC) or Non-energized (NO) contact according to use cases and scenarios. When Energized is
selected, the relay will have energy during normal operation. When Non-energized is selected,
the relay is only energized when performing the switching function.
Off Delay: User can define delay to deactivate the alarms. Equipment keeps alarms and relay
contacts active fter measured gas level goes below the defined alarm level. This function must
be adjusted according to operating conditions and safety rules. For example, in some plants
ventilation fans kept activated after the measurement level falls below the alarm level. In such
cases the off delay feature can be used. The off-delay can only be defined in minutes.
PRS-UM-HT-EN-Rev1.0-19.12.2022
Alarm 1 Settings
Level: 10%
Auto-reset: NO
Directions: Rising
Relay: De-energized
Off Delay:00 Min
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