Vaisala FD12P Weather Sensor User Manual

About this manual

This guide covers all aspects of the FD12P weather sensor, including general information, hardware structure, sensing elements, and optical system. It details the installation process, grounding, cable selection, and mounting procedures required for proper deployment.

The manual also explains normal operation commands, functional descriptions, calibration methods, maintenance tasks, and troubleshooting steps. Appendices provide code tables, jumper settings, and test point locations for advanced service work.

What's inside

• General Information
• Product Overview
• Installation
• Operation
• Functional Description
• Maintenance
• Troubleshooting
• Appendix A: NWS and WMO Codes
• Appendix B: Jumper Settings and Internal Wiring
• Appendix C: Transmitter and Receiver Test Points

Frequently asked questions

How do I ground the FD12P sensor?

Grounding instructions are provided in the section titled "Grounding for Testing Purposes".

How can I calibrate the FD12P after replacing the unit?

The manual includes a dedicated procedure called "Calibrating FD12P Weather Sensor after Unit Replacement".

What communication interfaces does the FD12P support?

The sensor supports serial RS‑232, serial RS‑485, and a DMX21 modem for communication.