TOX 914 LON®
Gas transmitter for measuring the concentration of toxic gases
Application
The gas measurement sensor ADOS TOX 914 LON® is suitable for the continuous measurement of the concentration of toxic gas in air.
Fields of Application
- In garages for measurement, control and warning purposes, the TOX 914 LON®, in conjunction with the FlexADOS 914 LON® fulfils the VDI guideline 2053 from December 2014 and also EN 50271
- For ambient air monitoring of occupational exposure limit values (German: AGW value) e.g. in laboratories or motor test stands
- In private and collective shelters to monitor external or internal air
Function Example, CO-sensor
The ADOS TOX 914 LON® CO gas measurement sensor uses a method where the air to be measured is diffused into a chemical measuring cell. The H+ ions and electrons released at the electrode are consumed in a cathode reaction.
The low of current between anode and cathode generated during this process is directly proportional to the CO concentration in the measured air.
The sensor current is amplified and applied via the LON® field bus of an evaluation unit e.g. FlexADOS 914 LON®, where the measured variable is processed and displayed in ppm CO together with any possibly necessary control and warning functions.
Example of measurable gases
| Gas |
Formula |
Measuring Range |
| Carbon monoxide |
CO |
0 – 300 ppm |
| Ammonia |
NH3 |
0 – 250 ppm |
| Nitrogen dioxide |
NO2 |
0 – 30 ppm |
| Sulphur dioxide |
SO2 |
0 – 50 ppm |
| Hydrogen sulphide |
H2S |
0 – 20 ppm |
Other gases and measuring ranges on request.
Technical data
| Measuring principle: |
Electro-chemical reaction |
| Measurable substance: |
Carbon monoxide |
| Measuring range: |
0 – 150 ppm, 0 – 300 ppm, other measuring ranges upon request |
| Zero point error: |
< 3 ppm CO |
| Measurement value error: |
± 3% of the measurement range end value |
| Long-term drift: |
< 5% (1 year) |
| Repeatability: |
< 2% of the measurement range end value |
| Temperature drift: |
< 10 ppm |
| Adjustable time (t90): |
< 60 seconds |
| Interface: |
LON® four-wire technology,
galvanically isolated, Data
transmission 78 kbps |
| Supply voltage: |
24 V DC +10% / -25% |
| Ambient temperature: |
- 20 °C to + 50 °C,
Sensor in the range
temperature-compensated |
| Humidity: |
10% – 90% r. h.,
non-condensing |
| Protection class: |
IP 54 acc. to EN 60529 |
| Measuring head dimensions: |
Diameter 80 mm,
Height 80 mm |
| Weight: |
400 g |
| Test certificate: |
VDI2053
EN50545
EN50271 in conjunction with
FlexADOS 914 LON® |