Macurco DVP-120 ユーザーズマニュアル

Revision 0.07 

31 

3.3.7.7  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 

The default rising trip points are: 

– 

Carbon Monoxide  100   ppm 

– 

Nitrogen Dioxide 

2.5 ppm 

– 

Combustible 

2,000  ppm 

3.3.7.8  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 

The default falling trip points are: 

– 

Carbon Monoxide 

50   ppm 

– 

Nitrogen Dioxide 

1.2 ppm 

– 

Combustible 

1,000  ppm 

3.3.7.9  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   

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 

 
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 there 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 

?

 the rising trip point and sensors with readings 

?

 the falling trip point. 

3.3.7.10 Multiple Sensor Quorum 

Z  1    G  r  o  u  p    1        N O 2 

Q u  o  r  u m  :    _  2             

It is up to the installer to ensure that the quorum entry is appropriate for the configuration. Valid entries are one 
to twelve, but a value greater than the number of sensors being monitored by the group, stops the group from 
controlling the outputs.