Installation Manual
28
When the second digit is entered, the sensor will be added or removed from the control group, provided the sensor is of the proper
type, NO2 in this example. If the sensor is of the wrong type, or an invalid sensor channel number is entered, the request will not be
completed.
3.3.6.7 Rising 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 3-49 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 NO2 EX NH3 H2S REF CO2 O2
Rising Level 35ppm 2.5ppm 10% 25ppm 8ppm 100ppm 1,000ppm 20.3%
3.3.6.8 Falling 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 3-50 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 NO2 EX NH3 H2S REF CO2 O2
Falling Level 15ppm 1.2ppm 5% 10ppm 3ppm 50ppm 800ppm 20.6%
3.3.6.9 Multiple Sensor Mode
Z 1 G
r
o
u
p
1
N
O
2
M
o d e :
2
V
o
t
i
n
g
Figure 3-51 Sensor Mode Selection
When multiple sensors are being monitored by a group, the output decision can be based on either voting, as shown here, or the
average of all sensors in the group. Valid modes are:
– 1 Average
– 2 Voting (default)
When the configuration is Average, the gas concentrations from all sensors in the group are averaged and if the average is greater
than or equal to the rising trip point the zone outputs(s) are activated. When 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 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. Activating the output(s)
is given priority if a group has an equal number of sensors with gas readings greater than or equal to the rising trip point and sensors
with readings less than or equal to the falling trip point.