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For each analog channel, you also have a corresponding deadband setting:
• HHDB
• HDB
• LDB
• LLDB
Deadband is the range you select that will latch an alarm until it exceeds that setting. HHDB
and HDB settings are below the HHAL and HAL settings while LLDB and LDB setting are above
the corresponding LLAL and LAL settings.
Analog Input Alarm Trip Settings:
These settings can range from 1-10,000 which correspond to the analog input.
Example, if using a 4-20mA input, a setting of 5,000 would be at 50% of full scale or 12mA.
Converting mAmps to Setting
Subtract mA by 4 then divide by 0.0016 to get 5 digit entry value.
Example: to determine the trip setting for 8mA input
Converting % of Scale to Setting
Multiply % of Scale x 10,000 to get 5 digit entry value
Example: to determine the trip setting for 75% of Full Scale: (75% x 10,000) = 7,500
Analog Input Alarm Deadband Settings:
These settings can range from 1-10,000 which correspond to the analog input.
Deadband or 'Hysteresis' is the value used to reset the alarm.
For example, if the HHAL setting was set at 90% of full scale (setting of 9,000) and it needs to
reset at 85% of Full Scale, the HHDB setting would be 8,500.
LLDB and LDB settings must be higher than the LLAL and LAL setting.
Example, if the LLAL setting was 10% of full scale (setting of 1,000) and it needs to reset at
15% of Full Scale, the LLDB setting would be 1,500.
Enabling or Disabling Settings:
All Alarm and Deadband settings need to be enabled (checkbox) before they will operate. They
can be disabled by un-checking the selection box.
High-High Deadband
High Deadband
Low Deadband
Low-Low Deadband
8-4 / 0.0016 = 2,500
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