E-mail: newsales12@vip.163.com
Tel: +86-15829050512
Contact Us

Address: Unit3.Building1, No.3 Courtyard, Pailou Alley Dongguan South Street, Beilin Distrct, Xi'an, Shaanxi, China

Tel: +86-15829050512

Fax: +86-029-82490435


Home > Knowledge > Content

Rosemount 644 Temperature Transmitter

Rosemount 644 Temperature Transmitter


The Rosemount 644 is a versatile temperature transmitter that delivers field reliability and advanced accuracy to meet demanding process needs.

Transmitter features include:

• HART / 4-20 mA, FOUNDATION fieldbus or Profibus PA protocols
• DIN A or Rail Mount transmitter types
• LCD Display (Option Code M5 or M6)
• Transmitter-Sensor Matching (Option Code C2)
• 3-Point Calibration Certificate (Option Code Q4)
• Assemble to Sensor options (Option Code XA)



Functional Specifications


User-selectable; sensor terminals rated to 42.4 Vdc. See “Accuracy” on page 12 for sensor options.


Single 2-wire device device with either 4–20 mA/HART, linear with temperature or input; or completely digital outputs with


FOUNDATION fieldbus communication(ITK 5.01 compliant), or Profibus PA (compliant with profile 3.02).


Input/output isolation tested to 600 Vrms.

Local Display

The optional five-digit integral LCD Display includes a floating or fixed decimal point. It can also display engineering units (°F, °C, °R, K, , and mV), mA, and percent of span. The display can be configured to alternate between selected display options. Display settings are preconfigured at the factory according to the standard transmitter configuration. They can be reconfigured in the field using either HART, FOUNDATION fieldbus or Profibus PA communications.

Humidity Limits

0–99% relative humidity

Update Time

 0.5 sec.

Accuracy (default configuration) PT 100

HART (0-100 °C): ±0.18 °C

FOUNDATION fieldbus: ±0.15 °C

Profibus PA: ±0.15 °C