SenseAir aSENSE RL, User Manual

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Document
UMA 149
Rev
6 Page
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Sensor outputs
Terminal Default Output Default Output
Range
Outputs of this
sensor
Output Range of this
sensor
Out(1) 0-10VDC 0-2000 ppm CO
2
See label See label
Out(2) 0-10VDC 0-50
o
C
32-122
o
F
See label See label
Relay Closed
Open
> 1000 ppm CO
2
< 900 ppm CO
2
See label See label
Table I. Default output configurations for aSENSE RL
The red LED is lit when the relay output is closed.
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 RL