Vaisala XMW85 CO2, Humidity and Temperature Modbus Transmitter

The Vaisala XMW85 Series provides reliable indoor CO2, humidity and temperature measurement for demand-controlled ventilation, smart buildings and indoor air-quality monitoring.

All models support Modbus RTU over RS-485, with two-in-one and three-in-one measurement configurations and optional metric or non-metric displays.

Vaisala XMW85 CO2, Humidity and Temperature Transmitter

The Vaisala XMW85 Series comprises configurable indoor transmitters for humidity, temperature and carbon-dioxide measurement. Designed for demand-controlled ventilation and smart-building applications, the series provides reliable real-time measurements through Modbus RTU communication.

Two-in-one models measure relative humidity and temperature, while three-in-one models add Vaisala CARBOCAP carbon-dioxide measurement. Versions with or without a local display are available.

The XMW85 helps building-automation systems optimise ventilation, improve energy efficiency and maintain healthy indoor conditions in offices, schools, healthcare facilities and commercial buildings.

Why Choose the Vaisala XMW85 Series?

  • Three-in-One Measurement Selected models measure carbon dioxide, relative humidity and temperature with one compact transmitter.
  • Modbus RTU Integration All models support Modbus RTU communication over an RS-485 interface.
  • Designed for Smart Ventilation Provides real-time measurements for demand-controlled ventilation and building-automation systems.
  • Vaisala CARBOCAP Technology CO2 models provide excellent long-term stability using the field-replaceable GM10 measurement module.
  • Replaceable Humidity Sensor The Vaisala INTERCAP humidity sensor can be replaced in the field with minimal downtime.
  • Optional Local Display Display models show measurement values using metric or non-metric temperature units.
  • Simple Installation The transmitter is designed for easy mounting, wiring and commissioning.
  • Low Maintenance Replaceable sensor components and stable measurement technology reduce maintenance requirements.

Available XMW85 Models

  • Vaisala XMW85H Relative humidity and temperature transmitter without a display.
  • Vaisala XMW85HD Relative humidity and temperature transmitter with a metric display showing %RH and °C.
  • Vaisala XMW85HE Relative humidity and temperature transmitter with a non-metric display showing %RH and °F.
  • Vaisala XMW85G Carbon dioxide, relative humidity and temperature transmitter without a display.
  • Vaisala XMW85GD Carbon dioxide, relative humidity and temperature transmitter with a metric display.
  • Vaisala XMW85GE Carbon dioxide, relative humidity and temperature transmitter with a non-metric display.

Carbon Dioxide Measurement

  • CO2 Measurement Range 0–2000 ppm.
  • Accuracy at +20 °C to +30 °C ±30 ppm plus 3% of the measured reading.
  • Accuracy at +10–20 °C and +30–40 °C ±35 ppm plus 3.7% of the measured reading.
  • Accuracy at 0–10 °C and +40–50 °C ±40 ppm plus 4.8% of the measured reading.
  • Long-Term Stability ±15 ppm plus 2% of the reading over five years under typical HVAC conditions.
  • CO2 Sensor Vaisala CARBOCAP GM10 module with an internal reference measurement.
  • Warm-Up Time Approximately one minute, or ten minutes to achieve the complete measurement specification.
  • Response Time Approximately 60 seconds for a 63% response.

Humidity Measurement

  • RH and Temperature Model Range 0–100% RH.
  • CO2 Model Humidity Range 0–95% RH.
  • Accuracy at +10 °C to +30 °C ±3% RH from 0–70% RH and ±5% RH from 70–100% RH.
  • Accuracy Outside the Central Temperature Range ±7% RH across the applicable humidity range.
  • Humidity Stability ±2% RH over two years under typical HVAC operating conditions.
  • Humidity Sensor Field-replaceable Vaisala INTERCAP humidity sensor.

Temperature Measurement

  • RH and Temperature Model Range −20 °C to +70 °C.
  • CO2 Model Temperature Range 0 °C to +50 °C.
  • Accuracy at +10 °C to +30 °C ±0.5 °C.
  • Accuracy Outside the Central Range ±1.0 °C across the applicable outer operating ranges.
  • Temperature Sensor Integrated digital temperature sensor.
  • Display Units Metric display models show °C, while non-metric models show °F.

Modbus RTU Communication

  • Digital Output Modbus RTU communication over RS-485.
  • Modbus Address Range Standard address range from 1–247.
  • Supported Bit Rates 4800, 9600, 19200, 38400 and 57600 bit/s.
  • Parity Selection Configurable for no parity or even parity.
  • Stop Bits Automatically supports one or two stop bits.
  • Onboard Configuration Communication settings can be configured using switches on the component board.

Electrical Specifications

  • DC Supply 18–35 VDC.
  • AC Supply 24 VAC ±20% at 50 or 60 Hz.
  • Wiring Screw-terminal connection for power and RS-485 communication.
  • Maximum Wire Size 1.5 mm² or approximately 16 AWG.

Operating and Mechanical Specifications

  • RH and Temperature Model Operating Range −20 °C to +70 °C.
  • CO2 Model Operating Range 0 °C to +50 °C.
  • Operating Humidity 0–100% RH under non-condensing conditions.
  • Protection Rating IP30 for indoor wall-mounted applications.
  • Housing Material UL-V0-approved ABS and polycarbonate.
  • Housing Colour RAL 9003 white.
  • RH and Temperature Model Weight Approximately 104 g without display or 113 g with display.
  • CO2 Model Weight Approximately 113 g without display or 122 g with display.

Replaceable Measurement Components

  • INTERCAP Humidity Sensor Can be exchanged by the user in the field with minimal interruption.
  • GM10 CO2 Module The carbon-dioxide measurement module can be replaced in compatible XMW85 models.
  • CARBOCAP Internal Reference Maintains stable CO2 measurement even in buildings occupied continuously.
  • Immediate CO2 Measurement CARBOCAP technology does not require a lengthy learning phase after installation.
  • Low Self-Heating Microglow light-source technology helps improve measurement performance.
  • Long Product Life Designed for a product lifetime exceeding 15 years under appropriate operating conditions.

Typical Applications

  • Demand-Controlled Ventilation Adjusts ventilation according to measured occupancy and indoor environmental conditions.
  • Smart Buildings Integrates indoor climate measurements into building-automation and energy-management systems.
  • Office Buildings Maintains comfortable and healthy working environments while reducing unnecessary ventilation.
  • Schools and Educational Facilities Supports classroom ventilation control using real-time CO2 and environmental measurements.
  • Healthcare Facilities Provides reliable indoor air monitoring for clinics, hospitals and other healthcare buildings.
  • Retail and Commercial Spaces Optimises ventilation according to changing occupancy levels and indoor conditions.
  • Hotels and Public Buildings Supports energy-efficient indoor climate control in occupied spaces.
  • Indoor Air Quality Monitoring Monitors CO2, humidity and temperature as key indicators of indoor environmental quality.

Vaisala XMW85 Supplier in Malaysia

Seacom Process Instruments supplies the Vaisala XMW85 Modbus transmitter in Malaysia. Our team can assist with selecting a humidity-and-temperature or CO2/humidity/temperature model, display option and Modbus communication configuration.

Contact Seacom for XMW85 product selection, pricing and availability for smart buildings, demand-controlled ventilation, schools, offices, healthcare facilities and commercial HVAC projects.

Download

  XMS85 Catalogue - (769.64k)

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