Rosemount 644 head Temperature Transmitter
Rosemount 644 Temperature Transmitter
Rosemount 644 Temperature Transmitter is a Versatile Temperature Transmitter that delivers field reliability and advanced accuracy and stability to meet demanding process needs.
Rosemount™ 644 Temperature Transmitter
Engineered for versatility, the Rosemount 644 Temperature Transmitter is available with HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols in head, field or rail mount styles and a variety of enclosure options. By adding a Local Operator Interface (LOI), you can update your transmitter configuration in the field without tools. For diverse application requirements, this transmitter includes diagnostic capabilities.
such as Hot Backup™ capability,sensor drift alert and thermocouple degradation.
Engineered for versatility, the Rosemount 644 Temperature Transmitter is available with HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols in head, field or rail mount styles and a variety of enclosure options. By adding a Local Operator Interface (LOI), you can update your transmitter configuration in the field without tools. For diverse application requirements, this transmitter includes diagnostic capabilities.
such as Hot Backup™ capability,sensor drift alert and thermocouple degradation.
Features
- Extremely versatile temperature transmitter available in HART™, FOUNDATION™ Fieldbus or PROFIBUS™ protocols
- Diverse mounting configurations including head, field or rail mount with many enclosure options
- LOI option eliminates the need for special configuration tools (i.e. field communicator) for ease-of-use
- Transmitter-sensor matching with Callendar-Van Dusen constants reduces total measurement error
- Hot Backup™ capability and sensor drift alert with dual sensors ensure measurement integrity
- Thermocouple degradation diagnostic monitors thermocouple health to detect degradation before failure
- Minimum and maximum temperature tracking observes temperature extremes for easy troubleshooting
- Device dashboards provide easy interface for simplified device configuration and diagnostic troubleshooting
The Rosemount 644 temperature transmitter is designed for use in control applications where the loss of the temperature points may be detrimental. These highly accurate Rosemount 644 temperature transmitters are available in a variety of mounting styles, field housings, and communication protocols to meet your demanding installation requirements.
Each Rosemount 644 temperature transmitter is a 2-wire design providing either a 4-20 mA/HART or a completely digital FOUNDATION fieldbus ouput. Each unit can be configured for a variety of sensor inputs: RTD, themocouple, millivolt, or ohm. The advanced Rosemount 644 temperature transmitter powers PlantWeb by communicating important temperature diagnostics and PlantWeb alerts to ensure process health and enable economical single-sensor architecture.
Entering the temperature-resistance profile specific to the RTD sensor into the Rosemount 644 temperature transmitter results in transmitter-sensor matching. This eliminates the sensor interchangeability error, which can improve accuracy by up to 75%. The integral LCD display provides local indication of temperature measurement and diagnostics for immediate and accurate verification or process conditions.
Meeting the NAMUR NE 21 recommendations, the Rosemount 644 temperature transmitter ensures top transmitter performance in harsh EMC environments. In addition, the Rosemount 644 HART transmitter meets NAMUR NE 43 and NE 89 recommendations.
The Rosemount 644 temperature transmitter offers great mounting flexibility. The DIN A style head mount transmitters fits a variety of housings for remote transmitter mounting and can be integral or remote mounted to a sensor. The compact rail mount style is great for DIN rail mounting in the tight spaces of a crowded control room
Each Rosemount 644 temperature transmitter is a 2-wire design providing either a 4-20 mA/HART or a completely digital FOUNDATION fieldbus ouput. Each unit can be configured for a variety of sensor inputs: RTD, themocouple, millivolt, or ohm. The advanced Rosemount 644 temperature transmitter powers PlantWeb by communicating important temperature diagnostics and PlantWeb alerts to ensure process health and enable economical single-sensor architecture.
Entering the temperature-resistance profile specific to the RTD sensor into the Rosemount 644 temperature transmitter results in transmitter-sensor matching. This eliminates the sensor interchangeability error, which can improve accuracy by up to 75%. The integral LCD display provides local indication of temperature measurement and diagnostics for immediate and accurate verification or process conditions.
Meeting the NAMUR NE 21 recommendations, the Rosemount 644 temperature transmitter ensures top transmitter performance in harsh EMC environments. In addition, the Rosemount 644 HART transmitter meets NAMUR NE 43 and NE 89 recommendations.
The Rosemount 644 temperature transmitter offers great mounting flexibility. The DIN A style head mount transmitters fits a variety of housings for remote transmitter mounting and can be integral or remote mounted to a sensor. The compact rail mount style is great for DIN rail mounting in the tight spaces of a crowded control room
- Input:
Single- or two-channel converters with universal inputs (resistance thermal converters, thermocouples, mV, Ohm); - Output signal:
4-20 mA, HART or FOUNDATION Fieldbus protocol; - Housing:
For field mounting, DIN A head or DIN rail; - Indicator/Interface:
LCD or LCD with Local Operator Interface; - Diagnostics:
Basic diagnostic functions, Hot Backup function, sensor drift alarm, thermocouple deterioration function, tracking temperature minimums and maximums; - Calibration options:
Matching of measuring transducer and primary transducer (Callender-Van Dusen constants), 5-point calibration; - Certification:
Certified by an accredited independent agency to IEC 61508 for SIL 2 and SIL 3, Hazardous Locations, Marine Applications 
- Product Parameters
Brand Name Rosemount Product Name Tempreature Transmitters Model Name 644 Temp -40~85ºC Display LCD Output 4-20mA
