Part No. 24-11443-00006, Rev. B
8
NS8000 Series
Repair information
If the NS Series Graphical Network Sensor
fails to operate within its specifications, replace the unit. For a replacement NS Series
Graphical Network Sensor, contact the nearest customer service center or Johnson Controls representative.
Altitude above sea level
Absolute pressure
Feet
Meters
hPa
-656
-200
1,038
0
0
1,013
656
200
989
1,312
400
966
1,969
600
943
2,625
800
921
3,281
1,000
899
3,937
1,200
877
4,593
1,400
856
5,249
1,600
835
5,906
1,800
815
6,562
2,000
795
7,218
2,200
775
7,874
2,400
756
8,530
2,600
738
9,186
2,800
719
9,843
3,000
701
Table 2: Table 3: CO
2
altitude compensation
CO
2
altitude compensation
The Johnson Controls NS Series CO
2
Network Sensors ship from the factory calibrated for an altitude range of 0 ft to 2,000 ft
(0 m to 600 m) without compensation.
For altitudes above 2,000 ft (600 m) where optimum accuracy of the CO
2
concentration measurement is essential, modify the
offset property of the NS Series CO
2
Network Sensors (Zone Quality [ZN-Q] Analog Input [AI]). The offset represents the local
atmospheric pressure in hectopascals (hPa). Set the offset to the known local pressure or use the local altitude value listed in
Table 3. The factory default value is 978 hPa.
As of Release 5.3 of the Controller Configuration Tool (CCT) and Facility Explorer® Programmable Controller Tool (FX-PCT)
software, the NS Series CO
2
Network Sensors (Zone Quality [ZN-Q] Analog Input [AI]) automatically change the hPa value entered
from Table 3 into the correct offset value in the CCT and FX-PCT software. The offset value for the SA bus device is labeled ppm;
however, it is the proper field to enter the hPa value found in Table 3. Refer to the
Controller Tool Help (LIT-12011147)
for more
details.
Note:
Enter the pressure value only in units of hPa. The sensor reads the value entered as hPa. The CO
2
present value may
require several minutes to settle after changing the offset value. See the following table for local altitude values.