Sewi Modbus
Indoor Sensors
Wall/ceiling sensor with temperature and humidity measurement and dewpoint calculation. CO2 sensor optional
The indoor sensors Sewi AQS/TH Modbus and Sewi TH Modbus measure the indoor temperature and humidity and also calculate the dew point temperature. The Sewi AQS/TH also records the CO2 concentration.
The devices are Modbus slaves with a RS485 interface and a RTU protocol. The Modbus master, such as PC, SPS or MC can read the Sewi Modbus Indoor Sensors measurement values with "Function 04h (Read Input Register)".
Models:
N° 30174 Sewi AQS/TH Modbus, CO2, temperature and humidity sensor
N° 30175 Sewi TH Modbus, temperature and humidity sensor
Sewi TH Modbus Indoor Sensor Functions:
- Temperature measurements
- Humidity measurements
- Calculating the dew point temperature
Sewi AQS/TH Modbus Indoor Sensor Functions:
- • Measuring the CO2concentration in the air
- Temperature measurements
- Humidity measurements
- Calculating the dew point temperature
Tips for Dew Point Calculation:
The sensors Sewi Modbus calculate the ambient dew point temperature. This value can be used for dew point monitoring. This would require another sensor for measuring the surface temperature of the wall or pipe. Also, the dew point needs to be monitored (compare with temperatures) in the Modbus master.
Monitoring predetermines the possible condensate build-up on the surface, giving a chance for timely countermeasures.
Housing | Plastic |
Colour | White (Cover glossy, skirting matt) |
Assembly | Surface, wall or ceiling installation |
Protection category | IP 30 |
Dimensions | Ø approx. 105mm, height approx. 32mm |
Weight | Sewi AQS/TH Modbus: approx. 100g Sewi TH Modbus: approx. 75g |
Ambient temperature | Operation 0 …+50°C, Storage -20 …+70°C |
Ambient humidity | max. 95% RH, avoid condensation |
Operating voltage | 24 V DC ±10%. An appropriate power supply unit can be purchased from Elsner Elektronik. |
Cable cross-section | Solid conductor up to 0.8mm2 |
Power | max. 15mA |
Interface | RS485 |
Protocol | RTU |
RS485 bus load | 1/8 unit load according to the RS485 standard |
RS485 drive output | min. 2.4V at 54 Ohm bus load (according to the 32 standard RS485 unit loads) |
Sewi TH Modbus (30175) | |
Temperature measurement range | -40...+80°C |
Humidity measurement range | 0% rH … 100% rH |
Sewi AQS/TH Modbus (30174) | |
Temperature measurement range | 0°C…+50°C |
Humidity measurement range | 0% rH…90% rH |
CO2 measurement range | 0...2,000ppm |
- Sensor in the housing for wall or ceiling mounting
- Data sheet with instrallation instruction (English, German, French, Italian or Spanish)
- Manual (German, English, French, Italian or Spanish) as download
Filter by language:
RTF
Item No.: 30174, 30175
Languages:
The indoor sensors Sewi AQS/TH Modbus and Sewi TH Modbus measure the indoor temperature and humidity and also calculate the dew point temperature. The Sewi AQS/TH also records the CO2 concentration.
The devices are Modbus slaves with a RS485 interface and a RTU protocol. The Modbus master, such as PC, SPS or MC can read the Sewi Modbus Indoor Sensors measurement values with "Function 04h (Read Input Register)".
Models:
N° 30174 Sewi AQS/TH Modbus, CO2, temperature and humidity sensor
N° 30175 Sewi TH Modbus, temperature and humidity sensor
Sewi TH Modbus Indoor Sensor Functions:
- Temperature measurements
- Humidity measurements
- Calculating the dew point temperature
Sewi AQS/TH Modbus Indoor Sensor Functions:
- • Measuring the CO2concentration in the air
- Temperature measurements
- Humidity measurements
- Calculating the dew point temperature
Tips for Dew Point Calculation:
The sensors Sewi Modbus calculate the ambient dew point temperature. This value can be used for dew point monitoring. This would require another sensor for measuring the surface temperature of the wall or pipe. Also, the dew point needs to be monitored (compare with temperatures) in the Modbus master.
Monitoring predetermines the possible condensate build-up on the surface, giving a chance for timely countermeasures.
Housing | Plastic |
Colour | White (Cover glossy, skirting matt) |
Assembly | Surface, wall or ceiling installation |
Protection category | IP 30 |
Dimensions | Ø approx. 105mm, height approx. 32mm |
Weight | Sewi AQS/TH Modbus: approx. 100g Sewi TH Modbus: approx. 75g |
Ambient temperature | Operation 0 …+50°C, Storage -20 …+70°C |
Ambient humidity | max. 95% RH, avoid condensation |
Operating voltage | 24 V DC ±10%. An appropriate power supply unit can be purchased from Elsner Elektronik. |
Cable cross-section | Solid conductor up to 0.8mm2 |
Power | max. 15mA |
Interface | RS485 |
Protocol | RTU |
RS485 bus load | 1/8 unit load according to the RS485 standard |
RS485 drive output | min. 2.4V at 54 Ohm bus load (according to the 32 standard RS485 unit loads) |
Sewi TH Modbus (30175) | |
Temperature measurement range | -40...+80°C |
Humidity measurement range | 0% rH … 100% rH |
Sewi AQS/TH Modbus (30174) | |
Temperature measurement range | 0°C…+50°C |
Humidity measurement range | 0% rH…90% rH |
CO2 measurement range | 0...2,000ppm |
- Sensor in the housing for wall or ceiling mounting
- Data sheet with instrallation instruction (English, German, French, Italian or Spanish)
- Manual (German, English, French, Italian or Spanish) as download
Filter by language:
RTF
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages:
Item No.: 30174, 30175
Languages: