4G data logger for Modbus weather station networks, HD33M-MB.4

Unattended weather stations need data that reaches the user, not a logger that has to be collected in the field. With integrated 4G/3G/GSM(2G)/GPRS transmission, this logger sends measurements by e-mail, FTP or HTTP server and supports remote control through SMS commands or TCP/IP connection.

Built for expandable sensor networks, it connects RS485 Modbus-RTU slave sensors as a Master and adds a voltage-free contact input for a rain gauge. Depending on the connected sensors, it can monitor temperature, humidity, atmospheric pressure, solar radiation, wind speed and direction, and rainfall quantity. Measuring and logging intervals from 1 s to 1 hour help match the recording strategy to the site.

The compact polycarbonate enclosure supports outdoor installation with ingress protection (IP67). A 7…30 Vdc supply, low current draw below 3 mA during measurement without cellular activity, and switched sensor power support mains-based or solar-powered systems.

Remote data access
Sends measurements by e-mail, FTP or HTTP server via 4G/3G/GSM(2G)/GPRS.

Rainfall ready
Contact input supports a rain gauge and calculates rainfall rate and daily rainfall.

Low field power
Draws < 3 mA during measurement without cellular activity and runs on 7…30 Vdc. Scalable networks
RS485 Modbus-RTU Master connects multiple slave sensors in the field.

Outdoor housing
Polycarbonate enclosure with ingress protection (IP67) for exposed installations.

Features

• RS485 Modbus-RTU input
  The logger operates as Master for connected Modbus-RTU slave sensors. A proprietary protocol can also be used with the HD2003 anemometer.
• Rain gauge contact input
  A voltage-free contact input connects a rain gauge. The contact can be configured as normally closed or normally open.
• Rainfall calculations
  The device calculates rainfall rate in mm/h and the rainfall amount in the last day, with a configurable compensation curve based on rainfall rate.
• Data logging memory
  Internal memory supports circular management or stop logging when full, with 120,000 to 424,000 samples depending on detected quantities.
• Alarm management
  Each detected quantity can use high and low alarm thresholds with configurable hysteresis and delay. Alarms can trigger the internal buzzer, e-mail or SMS.
• Sensor power output
  A switched power supply output energizes external sensors only when measurements must be detected.
• PC software
  HD35AP-S software configures measurements, alarms, logging and transmission intervals, displays real-time values and downloads data to a database.
• Optional CFR21 software
  HD35AP-CFR21 adds functions aligned with FDA 21 CFR part 11 recommendations, including audit trail and controlled user access.