Specifications

20
Sensors are included or removed from the group by entering the two-digit channel number. After a sensor is added or removed, the list will be re-sorted so it does not matter in which order
the sensors are added or removed. The default is to include all sensors of the specified type.
When the first digit of a sensor number is entered (a leading zero must be entered if the number is less than ten), the display will prompt to Add or Remove a sensor from the group.
Figure 3-48 Add/Remove Sensor Prompt
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.
3.3.7.7 Rising Trip Point
Figure 3-49 Rising Trip Point Entry
The default rising trip points are:
- Carbon Monoxide 35ppm
- Nitrogen Dioxide 2.5ppm
- Combustible5%LEL
3.3.7.8 Falling Trip Point
Figure 3-50 Falling Trip Point Entry
The default falling trip points are:
- Carbon Monoxide 15ppm
- Nitrogen Dioxide 1.2ppm
- Combustible3%LEL
3.3.7.9 Multiple Sensor Mode
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conguration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conguration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.
3.3.7.10 Multiple Sensor Quorum
Figure 3-52 Quorum Entry
Itisuptotheinstallertoensurethatthequorumentryisappropriatefortheconguration.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.Thedefaultquorumvalueis1.
3.3.8 Configure Signals Submenu
The DVP-120 can drive the buzzer, horn and strobe with different sound patterns to indicate the severity of the current conditions. These patterns are selectable by the installer using this
group of submenus. Once again, the left and right keys will scroll through the signal types and the up and down keys will scroll to the signal sources.
3.3.8.1 Alarm Signal Summary
The alarm signals are in response to one or more sensors indicating gas levels at or above the sensors’ configured alarm level.
Figure 3-53 Alarm Signals
This display example shows that alarms are signaled by the internal buzzer, the external horn and the strobe.