Gas monitoring in-situ
CO concentrations of over 50 ppm in breathing air lead after a short time lead to impacts well-being, concentration and health. To avoid such impacts by a proper ventilation CO concentration in the tunnel’s driving area is monitored.
The sensor is directly mounted at the measuring point. Air is fed into an electrochemical gas sensor by a capillary. The CO gas reacts at the sensor’s sensing electrode and a current proportional to the gas concentration is generated.
Given this current the sensor calculates the gas concentration and shows it on its display in ppm. The output current depends on the chosen measuring range and the measured gas concentration.
The sensor by a menu guided process can be recalibrated with zero and reference gas such that long time drift can be compensated.
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t/ECS Gas sensor
- Mounted directly in the tunnel’s driving area
- Electrochemical sensing of the gas concentration
- Sensor cells for different gases: CO, NO, NO2 and others
- Passive, analogue 2-wire transmitter 4-20 mA
- LCD to display measured value
- Selectable measuring range
- Menu guided recalibration with zero and reference gas without the need to open the sensor housing
- Simulation of output values
- Available either in wall-mounted or flush-mounted stainless steel housing or with a stainless steel cover if the inner sensor housing is mounted behind an existing panel
- Protection against splash water and water jets during tunnel wash events
- Electrochemical sensor in ABS plastic housing with display and membrane keypad
- Stainless steel housing or cover panel for protection against splash water and water jets
- Connection either to tunnel control system, evaluation unit or visibility sensor
- Speziell für die Anwendung in Tunnels entwickelt
- Robustes Edelstahl Gehäuse mit Schwallwasserschutz unempfindlich gegen Korrosion und Tunnelwäsche
- Wartungsarm, empfindlich, stabil und genau
- Flexible Integration in die Tunnelleittechnik
- RVS konforme Montagehöhe realisierbar
- Sensorzelle menügeführt wieder abgleichbar
| Gas measurement | |
|---|---|
| Measuring method | Electrochemical gas analysis |
| Measured value | Gas concentration in ppm |
| Measuring range | Selectable, typically (default): 0 .. 300 ppm CO 0 .. 20 ppm NO2 0 .. 50 ppm NO |
| Resolution | 1 ppm CO, 0,1 ppm NO2, 0,5 ppm NO |
| Long term drift | < 5 % per year |
| T90 time | < 30 s |
| Temperature range | -20 .. +50 °C, sensor temperature compensated |
| Pressure range | 900 .. 1100 hPa |
| Humidity range | 15 .. 90% relative humidity (non condensing) |
| Sensor | |
|---|---|
| Type | t/ECS |
| Power supply | 24 VDC via current loop |
| Housing materal | Glass bead reinforced polyamide (PA 6 30% GK) |
| Dimensions | 64 x 98 x 34 mm |
| Protection class | IP 64 |
| Weight | ca. 160 g |
| Analogue output | 4 – 20 mA |
| Wall-mounted housing | |
|---|---|
| Type | t/ECS-AP |
| Housing material | Edelstahl V4A 1.4571 |
| Dimensions | 200 (250) x 200 x 118,5 mm |
| Protection class | IP 66 (sensor in housing) |
| Weight | ca. 3 kg |
| Conformities | |
|---|---|
| Electrical standards | 2006/95/EG Niederspannungsrichtlinie (LVD) 2004/108/EG Elektromagnetische Verträglichkeit (EMV) IEC 61326-1:2012 IEC 61010-1:2010 |
| Tunnel safety | AT: RVS 09.02.22 DE: RABT 2006 CH: ASTRA RL 13001, Fachhandbuch BSA |
| Gas monitoring | AT: ÖNORM M9418, ÖNORM M9419 DE: VDI 2053 |
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System setup
Gas sensor t/ECS
The gas sensor is mounted in a height of about 1.5 m above the carriageway.
Visibility sensor VisGuard
The gas sensor t/ECS can be either connected to the visibility sensor VisGuard or directly to the tunnel control system.
Connection to tunnel control system
The gas sensor t/ECS can be directly connected to the tunnel control system through its analogue output. When used together with the visibility sensor VisGuard the system can be connected via analogue outputs or via RS-485 MODBUS RTU.
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