What is the difference between Rosemount temperature transmitters 248 and 644?

As we all know, the Rosemount 248 and Rosemount 644 are temperature transmitters produced by Rosemount Inc., and they have been widely used in various industrial fields. But what are the differences between these two Rosemount temperature transmitters? Today, the technical editor from Shaanxi Huibo Electromechanical will introduce the differences between the Rosemount temperature transmitters 248 and 644. In fact, the most direct difference between them is that the Rosemount 248 does not have an LCD display, while the 644 has an LCD display. This can be directly distinguished from the appearance.

Additionally:
1. The 248 temperature transmitter is mainly installed in the connection housing of the temperature sensor to form an integrated temperature component, with a two-wire input and communication.
2. The 644 transmitter, in addition to forming an integrated thermometer, can be installed indoors (behind the panel) through special accessories, and can have 2, 3, or 4 wire inputs. Besides temperature measurement, it can also be used as a resistance or millivolt transmitter, with models that have communication. Additionally, it employs some technologies to improve indicators such as temperature compensation.
Note: Definitions of two-wire, three-wire, and four-wire systems:
Two-wire system: Two wires transmit both power and signal, meaning the load output from the sensor and the power supply are in series, with the power supply introduced from the outside to drive the load in series.
Three-wire system: A three-wire sensor has the positive terminal of the power supply and the positive terminal of the signal output separated, but they share a common COM terminal.
Four-wire system: Two wires for power and two wires for signal. The power and signal operate separately.
By using the Rosemount temperature transmitters 248 and 644, the accuracy/overall performance of temperature measurement can be improved, installation can be more convenient, flexibility can be greater, and overall costs for installation, maintenance, and operation can be reduced. Rosemount not only offers a full range of high-precision, high-reliability, and high-stability temperature transmitters and sensors, but also has various application experiences and solutions for temperature measurement, providing users with a comprehensive solution for temperature measurement.
- Improve the accuracy/overall performance of temperature measurement
- More convenient installation
- Greater flexibility
- Reduce overall costs for installation, maintenance, and operation
If you have better suggestions regarding the differences between the Rosemount 248 and 644 temperature transmitters, feel free to discuss with us online. If you have procurement needs for the 248 and 644 temperature transmitters, please contact our online customer service, and we will get in touch with you as soon as possible to provide you with the most cost-effective solution.