CO and Temperature Sensor with Measuring Range Changeover

The air quality sensor measures the CO concentration of the ambient air in the range of 0-1000 ppm by an electrochemical sensor and the air temperature from 0...+50°C. The transducer converts the measurement values for further processing in a linear output signal 0-10 V or 4-20 mA. The transducer has 3 different scales (0-200 ppm, 0-500 ppm, 0-1000 ppm) which can be adjusted by innovative DIP switch technology. The zero-point adjustment in response to the current environmental conditions can be made by manual calibration on the device. The air quality sensor runs in regular intervals an automatic re-calibration procedure, whereby a long-term stable CO measurement is ensured.

Product specifications

Measurement range CO:

0-1000 ppm, scales 0-200/500/1000 ppm by DIP switch selectable

Measurement range temp.:

0...+50°C

Accuracy:

±5 ppm + max. ±5% f. mv (at 20°C, 50% r.H.), ±1 K

Temperature dependency:

5 ppm / K

Response time (t90):

< 5 min

Long term stability:

±1% FS/year

Sensor:

Electrochemical sensor interchangeable

Sensor protection:

sinter filter

Running-in time:

10 min

Supply voltage:

24 V AC/DC (±5%)

Current consumption:

max. 20 mA

Analogue output 0-10 V:

3-wire connection

Analogue output 4-20 mA:

3-wire connection

Electrical connection:

screw terminals max. 1,5 mm²

Housing:

polyamide with snap closing screws, colour white like RAL 9010

Cable gland:

PG11 high-strength cable gland with strain relief

Dimensions:

Housing: L 64 x W 58 x H 34,5 mm

Protection type:

IP65

Protection class:

III

Working range r.H.:

0...98% r.H. in contaminant-free, non-condensing air

Working temperature:

0...+50°C

Storage temperature:

-20...+50°C

Initial operation:

After switch-on of the device it runs a self-test and the zero-point calibration. This process takes, depending on ambient conditions, about 10 minutes. Within this time, the linear output signal deviates from the actual measured value.

Automatic calibration:

To ensure an excellent long-term stability, in the interval of 7 days the device runs an automatic recalibration. Through this automatic calibration possible drifts are compensated. Within this interval must be at least 1x fresh air with 0 ppm CO be present. This feature can be disabled on the device by DIP switch.

Manual calibration:

The manual calibration of the output signal to 0 ppm (zero point) will be started by pushing the button on the circuit board (push ca. 5 s until LED is blinking). Before this it is to ensure a non-stop operating of min. 10 minutes on fresh air. After successful calibration the LED will be deactivated.

Installation:

screw fastening

Approvals:

CE-conformity, EAC, RoHS