The ENOX tunnel monitor measures the concentration of Nitrogen Dioxide (NO2) within an ambient environment such as road and rail tunnels or other industrial applications. These measurements can be used as part of an air quality management system for ventilation control.
The ENOX is a fixed sensor, which uses an electrochemical cell for NO2 detection. The ENOX consists of a Sender Unit and a ‘plug-in’ Sensor Module, which are mounted together on the wall or ceiling of the tunnel. The Sensor Module is pre-calibrated and stores all necessary data relating to type identification, sensing range and specific calibration. This data is automatically recognised by the Sender Unit when the module is fitted.
Features
Benefits
Specifications
Measurement Performance
| No. | Parameter | Units | Min | Max | Comment |
|---|---|---|---|---|---|
| 1 | Measurement Range | ppm | 0 | 10 | |
| 2 | Resolution | ppm | 0.1 | Display resolution | |
| 3 | Accuracy | ppm % |
-0.1 -2 |
+0.1 +2 |
|
| 4 | Response Time | seconds | 40 20 |
T90 T63 |
|
| 5 | Temperature Stability | % | -3 | +3 | Over full temperature range |
| 6 | Span Drift | % / Month |
-1 | +1 | |
| 7 | Calibration Interval | Months | 6 | 12 | Recalibrate or replace sensor module |
Power
| No. | Parameter | Units | Min | Max | Comment |
|---|---|---|---|---|---|
| 8 | Voltage | Vdc | +24 | 90-260 Vac with optional PSU | |
| 9 | Voltage Tolerance | % | -10 | +10 | |
| 10 | Nominal Current Consumption | mA | 40 | ||
| 11 | Power Up Current Consumption | mA | 50 |
Interface Options
| No. | Parameter | Units | Min | Max | Comment |
|---|---|---|---|---|---|
| 12 | Analogue Output | mA | 4 | 20 | (ESU-420 only) |
| 13 | Serial Output | Modbus RTU via RS485 (ESU-485 only) |
Physical
| No. | Parameter | Units | Min | Max | Comment |
|---|---|---|---|---|---|
| 14 | Ingress Protection | IP65 | Gas port IP54 | ||
| 15 | Operating Temperature | °C | -20 | +50 | |
| 16 | Operating Humidity | % | 15 | 90 | Non condensing |
| 17 | Ambient Pressure | mBar | 800 | 1100 | |
| 18 | Regulatory Compliance | 2014/30/EU (Electromagnetic Radiation) 2014/35/EU (Low Voltage) 94/9/EC (ATEX) |
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| 19 | Materials | Reinforced Polymer | |||
| 20 | Dimensions | mm | 140 x 98 x 57 | ||
| 21 | Weight | kg | 0.6 | ||
| 22 | Warranty | Months | 24 | Return to base warranty. Extensions available |
