How About Rosemount 248 temperature transmitter

- Jan 25, 2021-

1. Improve the accuracy/overall performance of temperature measurement

a. The transmitter fine-tunes its internal temperature curve according to the actual curve of the sensor, which can greatly reduce the interchangeability error of the sensor (up to 75%); 644H and 644R intelligent temperature transmitter-transmitter and sensor comparison function , Matching function 3144 and 3244MV intelligent temperature transmitter-transmitter and sensor matching function

b. During thermocouple measurement, the transmitter converts the millivolt signal into a 4-20mA signal that is less sensitive to noise, which improves the anti-interference ability and greatly reduces the length of the compensation wire;

c. Eliminate the cold junction compensation error of the thermocouple;

244EH and 244ER PC programmable temperature transmitter, 644H and 644R smart temperature transmitter, and 3144 and 3244MV smart temperature transmitter, all have automatic cold junction compensation function

d. The 3244MV intelligent temperature transmitter has the function of temperature difference measurement. The accuracy of temperature difference measurement is better than that of using two transmitters to measure and send to DCS (or send the signals of two sensors directly to DCS) and then calculate the temperature difference. The accuracy is several times higher.

2. Installation is more convenient

a. After using the transmitter, all cables are the same and are ordinary copper wires

b. It is easier to stretch a copper cable than to stretch the compensation wire of a thermocouple

c. The wiring of the cable is easier, and there is no special rule to avoid the power supply


3.Greater flexibility

a.When using a temperature transmitter, the temperature measurement is 4-20mA signal like other process measurement (such as pressure, liquid level, flow), and DCS can use the same I/O card

b.The temperature input can be combined with the input of other transmitters, without the need to configure a special I/O card for thermocouples and thermal resistances

4.Reduce the overall cost of installation, maintenance and operation

Copper cables are cheaper than compensating wires of thermocouples

a.Copper cables are cheaper than compensating wires of thermocouples

b.copper cables eliminates the need for separate cable racks and conduits, which means lower installation costs

c.The DCS I/O card types are similar that reducing the number of cards and the number of unused terminals

d.The intelligent transmitter has a diagnostic function, which can detect and judge whether it is a sensor failure or a process alarm, thereby reducing the number of on-site maintenance, which means a great maintenance saving

e.Better temperature measurement performance can increase productivity, which means great production savings

_20210125110325