Document
UMA 139
Rev
2
Page
2 (7)
Terminal
Default Output
Default Output
Range
Outputs of this
sensor
Output Range of
this sensor
Out(1)
0-10VDC
0-2000 ppm CO
2
Out(2)
0-10VDC
0-50
o
C
32-122
o
F
Table I. Default output configurations for aSENSE
Formulas for calculation of output values
Configuration
Output Range
Formula for calculation
0-10 VDC
0-2000 ppm CO
2
0-50
o
C
32-122
o
F
CO
2
value = Volt/10*2000
Temperature value in
o
C = Volt/10*50 = Volt*5
Temperature value in
o
F = Volt*9+32
2-10 VDC
0-2000 ppm CO
2
0-50
o
C
32-122
o
F
CO
2
value = (Volt
–2)/8*2000
Temperature value in
o
C = (Volt
–2)/8*50
Temperature value in
o
F = (Volt
–2)/8*(122-32)+32
4-20 mA
0-2000 ppm CO
2
0-50
o
C
32-122
o
F
CO
2
value = (mA-4)*2000/16
Temperature value in
o
C = (mA-4)*50/16
Temperature value in
o
F = (mA-4)/16*(122-32)+32
a-b
c
–d
Value = (reading-a)/(b-a)*(d-c)+c
a = lowest value of the configuration
b = highest value of the configuration
c = lowest value of the range
d = highest value of the range
Table II. Calculation of CO
2
value and temperature value for aSENSE
Output Configurations
The sensors/controllers are supplied from the factory (unless otherwise ordered) with
0...10VDC linear outputs for Out(1) and Out(2
)
(see Table I). If other options are
needed for the application, the output jumpers have to be configured before the unit
is powered up. Each jumper selection is independent from the others, except for the
“Start point selection” jumper, which affects both Out(1) and Out(2
)
linear outputs.
Alternative measuring ranges of the outputs can be selected with the software UIP
(version 5 or later).
