Ventilation duct sensor for CO 2 and temperature
Description
The model A2G-85 ventilation duct sensor with an integrated temperature measurement is suitable for direct mounting on circular ventilation pipes or rectangular ventilation ducts.
The A2G-85 is a high-quality product solution for ventilation and air-conditioning applications. This ventilation duct sensor measures carbon dioxide (CO2 ) in accordance with the NDIR measuring principle, and in addition also temperature. Due to the combination of these two measurement parameters in one single instrument, the material and mounting cost is considerably reduced.
Ventilation duct sensor, model A2G-85, without LC display
The adjustable mounting flange enables a quick installation. The illuminated LC display provides good readability, even from a distance. The screwless cover enables fast wiring and commissioning.
The measurement of the CO2 and the air temperature as the basis of demand-orientated control/regulation is gaining ever more importance in the ventilation and air-conditioning industry. The sensor signals for both measurement parameters are transmitted to the control/regulation or building automation with analogue output signals (0 ... 10 V, 4 … 20 mA) or digital Modbus ® protocol.
Special features
- Electrical output signal DC 0 … 10 V, 4 … 20 mA or Modbus ®
- Simple installation
- Compact and robust design
- Maintenance-free
| Model | A2G-85 |
| Product family | A2G |
| Subcategory | Ventilation duct sensor |
| Temperature ranges | +0…+50 °C |
| Accuracy class | < 0.5 °C |
| Process connection | Adjustable mounting flange |
| Process temperature | +0…+50 °C |
| Output signal | DC 0 ... 10 V · 4 ... 20 mA · Modbus · Modbus® |
| Power supply | AC 24 V or DC 24 V ±10 % |
| Electrical connection | Cable gland M16, Screw terminals, Max. 1.5 mm² |
| Probe material | ABS, Polycarbonate |
| Ambient temperature | −20…+70 °C |
| IP rating | IP54 |
| Weight | 0.15 kg |
| Certifications | CERoHS |
| Sensor type | NTC |
| Thermowell | No |
| Datasheet languages | EN |
| Version | ■ Version without LC display ■ Version with LC display |
|---|---|
| Measuring range | |
| CO 2 | 400 …2,000 ppm |
| Temperature | 0 …50°C[32 …122 °F] |
| Accuracy | |
| CO 2 | ±40 ppm +2 %of reading value |
| Temperature | < 0.5 °C [0.9 °F] |
| Power supply U B | AC 24V or DC 24V ±10% |
| Power consumption | Max.230mA |
| Electrical connection | Cable gland M16 Screw terminals Max.1,5mm 2 |
| Output signal | ■ DC 0 ... 10 V, load min. 1 kΩ ■ 4 …20mA, load R min. 20 Ω, max.500Ω ■ Modbus ® |
| Material | |
| Case | Plastic (ABS) |
| Cover | Polycarbonate |
| Sensor sleeve | Plastic (ABS) |
| Mounting flange | LLPDP |
| Permissible temperatures | |
| Operating | 0 …50°C[32 …122 °F] (at sensor) |
| Ambient | -20 …+70 °C [-4 …+158 °F] |
| Relative humidity | 0 ... 95 %, non-condensing |
| Ingress protection per IEC/EN 60529 | IP54 |
| Weight | 150 g |
| Mounting | By means of adjustable mounting flange |
| Protocol | Modbus ® via serial interface |
|---|---|
| Transfer mode | RTU |
| Interface | RS-485 |
| Byte format | (11 bits) in RTU mode Coding system: 8 bits binary Bits per byte: - 1 start bit - 8 data bits, least significant bit is sent first - 1 bit for parity - 1 stop bit |
| Baud rate | 9,600, 19,200, 38,400 - adjustable in the configuration |
| Modbus ® addresses | 1 …247 addresses - adjustable in the configuration |
| A | B | C | D | E | F | Ø G | H | I |
|---|---|---|---|---|---|---|---|---|
| 119 [4.69] | 45 [1.77] | 5.2 [0.2] | 70 [2.76] | 15 [0.59] | 186 [7.32] | 12 [0.47] | 95.5 [3.76] | 88.5 [3.48] |
| Description | Country |
|---|---|
| EU declaration of conformity | European Community |
| EMV directive | |
| RoHS directive | |
| WEEE directive |
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