Macurco DVP-120 User Instructions page 47

 Falling (off) Trip point
The default falling trip points are:
Carbon
Description
Monoxide
Type CO
Falling Level 15ppm
 Average or Voting Mode
 Configure Group 2 - repeat for up to three groups
When multiple sensors are being monitored as a Group, the DVP-120 output can be based on either sensor Voting (default) or the
Average of all sensor readings in the Group.
When the configuration is Average, the gas concentrations from all sensors in the Group are averaged.

If the average is greater than or equal to the rising trip point, the zone outputs are activated.

If the average is less than or equal to the falling trip point, the zone output(s) are de-activated.

If the average is between the two trip points, the outputs remain in their previous state.
When the configuration is Voting, the number of sensors in the Group indicating a value greater than or equal to the rising trip point is
counted.

If the count is greater than or equal to the Quorum (the minimum number of sensor votes in a Group needed) then the zone
output(s) are activated.

If the count of sensors indicating less than or equal to the falling trip point is greater than or equal to the Quorum the zone
output(s) are de-activated.

If a group has an equal number of sensors with gas readings greater than or equal the rising trip point and sensors with
readings less than or equal to the falling trip point, activating the output(s) is given priority.
It is up to the installer to ensure that the Quorum entry is appropriate for the configuration. Valid entries are from one to twelve, but a
value greater than the number of sensors being monitored by the group stops the group from controlling the outputs. The default
Quorum value is 1; in this case, only 1 sensor vote is needed to control the output.
5. Configure Signals Submenu
5.7 See section 3.3.8 Configure Signals Submenu for more detail
Press Menu to display Hardware Summary
 x5 Configure Signals
Alarm Signals
Z 1 G r o u p
F a l l i n g :
Figure A-25 Falling Trip Point Entry
Nitrogen Combustible
Dioxide Gas
NO2 EX
1.2ppm 5%
Z 1 G r o u p
M o d e : 2
Figure A-26 Sensor Mode Selection
1 N O 2
1 . 0 p p m
Hydrogen
Ammonia
Sulfide
NH3 H2S
10ppm 3ppm
1 N O 2
V o t i n g
47
Carbon
Refrigerants
Dioxide
REF CO2
50ppm 800ppm
Oxygen
O2
20.60%