26/3/19 Let us introduce a brand-new line of air quality sensors combining broad connectivity, measurements of six quantities at once and compact on-wall installation.
Basic characteristics
The RW/RLW sensor line is designed for measurements of interior air quality in houses, office buildings, schools and other similar buildings. The sensor itself is placed in a compact on-wall plastic box with IP20 protection with easy installation. Aside from the default design, customers can also purchase a special "Anti-Vandal" version made from durable anodized aluminium. A variant for interiors with higher aesthetic requirements is also available.
All four models offered can be used to measure temperature, relative air humidity, VOC and barometric pressure with -THC models being able to also measure the carbon dioxide concentration with a LED indication (green = low CO2 concentration, red = high CO2 concentration). Currently, we are also developing a dust sensor for measuring the concentration of dust particles.
| Model overview | ||||||
| Model | Temperature | Humidity | CO2 | VOC | Bar. pressure | Dust* |
| RLW-TH | ✓ | ✓ | × | ✓ | ✓ | × |
| RLW-THC | ✓ | ✓ | ✓ | ✓ | ✓ | × |
| RW-TH | ✓ | ✓ | × | ✓ | ✓ | × |
| RW-THC | ✓ | ✓ | ✓ | ✓ | ✓ | × |
*dust sensor is under development
Broad connectivity
Sensors feature an onboard web server and support communication through RS485 interface (Modbus RTU protocol) Sensors can also communicate wirelessly via Wi-Fi (Modbus TCP, REST API interface) - the initial configuration can be performed in AP mode with the device subsequently operating in client mode. RLW-TH and RLW-THC models then support the LoRaWAN wireless technology featuring a combination of long signal range and very low energy consumption. The product will be delivered with a free Mervis database licence.
| Model | RS485 | Wi-Fi | LoRaWAN |
| RLW-TH | ✓ | ✓ | ✓ |
| RLW-THC | ✓ | ✓ | ✓ |
| RW-TH | ✓ | ✓ | × |
| RW-THC | ✓ | ✓ | × |
A screenshot of the web server interface
Technical parameters
| Basic characteristics | |
| Power supply | 5-24V DC, 250ma (microUSB/terminal box) |
| Dimensions | 120×80×25 mm |
| Installation | on-wall installation box (IP20) |
| Measurement parameters | |
| Air temperature | -40°C / +85°C |
| Relative air humidity | 0-90% RH non-condensing |
| CO2 concentration | 0 - 10 000 ppm |
| VOC concentration | IAQ Index 0-500 |
| Barometric pressure | 300 - 1100 hPa |
| Solid particle concentration (PM10, PM2.5) |
0,0 - 999,9 μg/m3 |
| Inputs & Outputs | |
| Digital output | max. 24V DC 50mA |
| Communication interfaces | |
| Wi-Fi (AP client) | 802.11 b/g/n 2,4 GHz (REST API) |
| LoRaWAN | Class A, 14dBm, SF 7-12, 868 MHz (ABT support, OTAA activation) |
| RS485 | Modbus RTU |
