Vaisala HMW92 Humidity and Temperature 2-Wire Transmitter for Wall Mounting, 4 to 20mA Outputs

Both analog and digital output
Easy installation, configuration, and field adjustment
Full 0 … 100%RH measurement range
Up to ±1.7%RH accuracy
User exchangeable humidity and temperature module
Available in four colors

HMW92 Humidity and Temperature Transmitter for High Performance HVAC Applications, Loop-Powered
The 2-wire HMW92 transmitter is designed for use in high performance HVAC applications such as museums, laboratories, data centers, and production facilities. The transmitter is quick and easy to install and use on the field even without any special tools. The most common settings, such as metric/non-metric and relative humidity / dew point unit selections, can be easily changed with dip switches when the enclosure is open.

On-site calibration and adjustment is exceptionally easy. The sliding cover lid exposes offset trimmers for 1-point calibration of both humidity and temperature parameters. The included display makes adjustment clear and convenient by instantly indicating the effects of any changes. A service port enables 2-point calibration, using either a PC or the Vaisala HUMICAP® Hand-Held Humidity and Temperature Meter HM70.

The transmitter also features a user exchangeable humidity and temperature module, which can be ordered as a spare part. The module is delivered with a calibration certificate.

Analog outputs are preset at the factory to:

• Channel 1: 4…20 mA = 0...100% RH
• Channel 2: 4...20 mA = -5...+55°C (+23...+131°F) T

BACnet in Brief

• A data communication protocol for Building Automation and Control networks
• Used in management, automation and field level communication
• ANSI/ISO/ASHRAE standard controlled by a standardization body
• Adds flexibility by allowing the integration of products and systems from different manufacturers

HMDW80 Series Humidity and Temperature Transmitters for Building Automation Applications

Wall-mounted Vaisala HMW90 Series HUMICAP®  Humidity and Temperature Transmitters measure relative humidity and temperature in indoor HVAC applications, where high accuracy, stability, and reliable operation are required.  

The flexible HMW90 series offers a variety of options and features. Transmitters include a display and a sliding cover with either an opening for the display or a solid front. Both analog and digital output options, including special scalings and calculated parameters, are available.

Quick and Easy to Install
HMW90 series transmitters are quick and easy to install. The wiring is connected through the back plate and the electronics with the sensors can be snapped on easily after the wiring is complete. The transmitter is configured using dip switches, which are accessible when the enclosure  is open.

Digital Communication Brings Benefits
The introduction of digital (BACnet/ Modbus) communication to field level devices brings many advantages. For example, all sensors can be centrally accessed and their performance can be easily monitored. Wiring is simple when multiple sensors are installed on the same bus. Sensors can be set up using standardized tools, and the system can be enlarged with additional sensors quickly and conveniently. In addition, parameters influencing measurements, such as pressure or site elevation, can be centrally set and updated.

Choose from a Wide Variety of Calibration Options
On-site calibration and adjustment is exceptionally easy. The sliding cover exposes offset trimmers for one- point calibration without disturbing measurement. The display instantly indicates the effects of changes, making it clear and convenient to make adjustments. A service port enables two-point calibration, using either a PC or the Vaisala HUMICAP ® Hand- Held Humidity and Temperature Meter HM70. HMW90 series transmitters include a user-exchangeable measurement module, which can be ordered as a spare part. Calibration services are available through all Vaisala Service Centers.