57
↑
Rising (activation) Trip point
Z 1 G r o u p 1 N O 2
R i s i n g : 2 . 5 p p m
Figure A-24 Rising Trip Point Entry
The default rising trip points are:
Description
Carbon
Monoxide
Nitrogen
Dioxide
Combustible
Gas
Ammonia
Hydrogen
Sulfide
Refrigerants
Carbon
Dioxide
Oxygen
Type
CO
NO
2
EX
NH
3
H
2
S
REF
CO
2
O
2
Rising Level
35ppm
2.5ppm
10% LEL
25ppm
8ppm
100ppm
1000ppm
20.3% v/v
↑
Falling (off) Trip point
Z 1 G r o u p 1 N O 2
F a l l i n g : 1 . 0 p p m
Figure A-25 Falling Trip Point Entry
The default falling trip points are:
Description
Carbon
Monoxide
Nitrogen
Dioxide
Combustible
Gas
Ammonia
Hydrogen
Sulfide
Refrigerants
Carbon
Dioxide
Oxygen
Type
CO
NO
2
EX
NH
3
H
2
S
REF
CO
2
O
2
Falling Level
15ppm
1.2ppm
5% LEL
10ppm
3ppm
50ppm
800ppm
20.60% v/v
↑
Average or Voting Mode
Z 1 G r o u p 1 N O 2
M o d e : 2 V o t i n g
Figure A-26 Sensor Mode Selection
→
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) is 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) is de-activated.