Rosemount 644H/644R Smart Temperature Transmitter Quick Installation Guide

About this manual

This guide provides basic installation instructions for the Rosemount 644H (with LCD) and 644R smart temperature transmitters. It covers safety precautions for explosive environments, electrical shock, and process leaks, as well as required certifications.

The document details configuration procedures, switch settings, wiring, power‑up, and loop testing. It includes tables of shortcut key sequences, typical connection methods for head‑mounted and rail‑mounted units, and a specifications table for ambient temperature limits and HART communication. This manual is written in Chinese.

What's inside

• Configuration (Bench Calibration)
• Validate Configuration
• Switch Settings
• Transmitter Installation
• Wiring and Power‑up
• Loop Test
• Product Certification
• Specifications

Specifications

Frequently asked questions

What safety hazards are warned about in the installation guide?

The guide warns that explosion, electrical shock, and process leaks can cause death or serious injury.

What loop resistance is required for the handheld communicator?

The loop resistance must be between 250 Ω and 1,100 Ω.

How do you set the switch on a Rosemount 644H with LCD display?

Power down, remove the LCD, set the switch to the desired position, then reinstall the LCD and power up.

Where can the full Rosemount 644 reference manual be found?

The full reference manual is available on EmersonProcess.com/Rosemount.