1、Product description:

　　644H and 644R intelligent temperature transmitters are extensions of Rosemount temperature instrument series,which could receive 2,3,4 line thermal resistence,thermocouple,resistence and mV input.Every transmitter will be characterized with special enviroment temperature of the factory,in order to reduce the measurement deviation in the whole working temperature range.

　　644H could compose integration temperature module by installing on the connnection housing of the sensor,or installing inside one terminal box away from the sensor; Or install the 644H on guideway by using optional installation component.The 644R could be directly installed on the wall or DIN guideway.

2、Main technique data

　　simulation precision ：±0.03% range

　　digital precision：±0.15℃(±0.27F)，Pt100 The thermal resistance

　　Ambient temperature influence：0.003℃/1.0℃，Pt100

　　stability：±0.1% for 1 year

　　input：Mv，ohm

　　output：4-20ma，used HART

　　Service voltage：12.0 to 42.4V

　　the outstanding performance and reliability:

　　Transmitter - sensor matching function, can improve the measurement precision of the whole system

　　Temperature correction circuit, reduce the temperature of the environment

　　Independent alarm circuit, electronic board and sensor fault can be detected

　　Performance indicators at least 3σ

　　accuracy：±0.15℃(±0.27oF), Pt100
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