2
Key technical specifications
Item
SenseAir
®
S8
Target gas
CO
2
Operating Principle
Non-dispersive infrared (NDIR)
Measurement range
0.04 to 2% volume CO2 (Note 1)
0 to 3.2% volume CO2 extended range (Note 2)
Accuracy
±0.02% volume CO2 ±3% of reading (Notes 3 and 4)
Response time
2 minutes by 90%
Operating temperature
0 to 50° C
Operating humidity
0 to 85% RH non condensed (note5)
Storage temperature
-40 to +70 C
Dimensions
32.7 x 19.7 x 9.9 mm
Weight
< 8 grams
Power supply
4.5 V to 5.25 V unprotected against surges and reverse connection
Power consumption
300 mA peak, 30 mA average
Life expectancy
15+ years in normal commercial environments
Compliance with
Emission: EN 61000-6-3:2007, EN 61000-6-4:2007
Immunity: EN 61000-6-1:2007
RoHS directive 2002/95/EG
Serial communication
UART, Modbus protocol (Note 6). Direction control pin for direct
connection to RS485 receiver integrated circuit.
Alarm output, Open Collector
8500/6500 ppm normally conducting
max 100 mA. Transistor open at CO
2
High, OR Power Low, OR at Sensor
Failure
PWM output, 1 kHz
0 to 100% duty cycle for 0 to 20000 ppm
3.3V push-pull CMOS output, unprotected
Maintenance
Maintenance-free for normal indoor applications with SenseAir
®
ABC on.
Table 1. Key technical specification for the SenseAir
®
S8
__________________________________________________________________________________________
Note 1: Sensor is designed to measure in the range 0 to 20000 ppm with specified in the table accuracy. Nevertheless
exposure to concentrations below 400 ppm may result in incorrect operation of ABC algorithm and shall be avoided
for model with ABC on.
Note 2: Sensor provides readings via UART in the extended range but the accuracy is degraded compared to specified in
the table one.
Note 3: Sensor requires to be exposed to fresh air at least every four weeks. Accuracy is defined after minimum 5 weeks of
continuous operation. However, some industrial applications do require maintenance. Please, contact SenseAir for
further information!
Note 4: Accuracy is specified over operating temperature range. Specification is referenced to certified calibration mixtures.
Uncertainty of calibration gas mixtures (+-2% currently) is to be added to the specified accuracy for absolute
measurements.
Note 5: Specification provides operating conditions 100% tested in production.
Note 6: See specification Modbus on SenseAir R_ S8 rev_P11_1_00.doc preliminary specification}
CO
2
Alarmstate open
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