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Gases and Measuring Ranges

Gas	Formula	Measuring Range
Carbon monoxide	CO	0 - 300 ppm
Ammonia	NH3	0 - 200 ppm
Nitrogen dioxide	NO2	0 - 30 ppm
Sulphur dioxide	SO2	0 - 50 ppm
Hydrogen sulphide	H2S	0 - 20 ppm

Technical Data e.g. CO sensor

Measuring principle:	Electro-chemical reaction
Measurable substance:	Carbon monoxide
Measuring ranges:	0-150 ppm, 0-300 ppm, other ranges on request
Zero error:	<10 ppm CO
Reading instability:	< 3 ppm CO
Accuracy:	± 3% of f.s.d.
Zero drift:	< 2% per year
Repeatability:	< 2% per year
Linearity:	< 2% of f.s.d.
Response time (t90):	< 60 sec.
Cross sensitivity:	< 2% with integrated filter
Interface:	two-wire current interface 4-20 mA or LON® four-wire techniques, data transmission 78 kbps
Supply voltage:	15V - 30V dependent on maximum load 100 - 500 ohm
Ambient temperature:	-10 °C to 40 °C, with sensor temperature compensation
Humidity range:	10 - 99%, non-condensing
Serviceable life of cell:	approx. 2 years
Protection class:	IP 30
Sensor dimensions:	diameter 80 mm, height 80 mm
Weight:	600 g
Test certificate:	To german standards, according to VDI 2053 in conjunction with ADOS Multitronik 592

Function Example, CO-sensor

The ADOS 592 CO gas sensor uses a method of measurement where the air to be measured is diffused in a chemical measuring cell.

The (H+)-ions and the electrons released, are consumed at the electrode in a cathode reaction.

The flow of current between anode and cathode, generated by this process, is directly proportional to the CO-concentration in the measured air.

The sensor current is amplified and applied via a 4-20 mA interface or via the LON^® field-bus to an evaluation unit, e.g. ADOS Multitronik 592, where the measured variable is processed and indicated in ppm CO, together with any control and warning functions which may be necessary.