# Ventilation duct sensor for CO 2 and temperature — A2G-85

> Ventilation duct sensor for CO2 and temperature with integrated temperature measurement and electrical output signals.

- Catalog code: a2g_85
- Model: A2G-85
- Category: Temperature measurement › Temperature transmitters
- Product page: https://avigan.com.ua/wika/en/products/a2g_85
- Price: on request
- Supplier: AVIGAN (TOV VIKA Prylad), official WIKA partner in Ukraine

## Overview

The model A2G-85 ventilation duct sensor with an integrated temperature measurement is suitable for direct mounting on circular ventilation pipes or ...

## Applications

- For measuring CO 2 and the temperature in ventilation ducts

## Special features

- Electrical output signal DC 0 … 10 V, 4 … 20 mA or Modbus ®
- Simple installation
- Compact and robust design
- Maintenance-free

## Specifications

| Parameter | Value |
|---|---|
| model | A2G-85 |
| product family | A2G |
| short description | Ventilation duct sensor for CO2 and temperature with integrated temperature measurement and electrical output signals. |
| subcategory | Ventilation duct sensor |
| certifications | CE; RoHS |
| ambient temp | -20 … 70 °C |
| ip rating | IP54 |
| weight kg | 0.15 |
| languages in datasheet | en |
| temperature ranges | 0 … 50 °C |
| sensor type | NTC |
| probe material | ABS; Polycarbonate |
| has thermowell | false |
| process connections | Adjustable mounting flange |
| process temp | 0 … 50 °C |
| output signal | DC 0 ... 10 V; 4 ... 20 mA; Modbus; DC 0...10 V; 4...20 mA; Modbus® |
| power supply | AC 24 V or DC 24 V ±10 % |
| electrical connection | Cable gland M16, Screw terminals, Max. 1.5 mm² |
| accuracy class | < 0.5 °C |

## Datasheet tables

### Ventilation duct sensor for CO 2 and temperature, model A2G-85

| 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 |

### Modbus ® communication

| 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 |

### C Dimensions in mm[in]

| 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 |  |

## Documents

- [ds_sp6907_en_co_833ab0](https://avigan.com.ua/wika/docs/wika/ds_sp6907_en_co.pdf) — PDF, 1115 KB, en