الخميس , مايو 28 2020

THE ELECTRICAL/ELECTRONIC TEMPERATURE TRANSMITTER

One of the most common electrical/electronic temperature transmitters (E.T.T) is made by Rosemount (Model 444).  This is used as an example of a typical instrument.

The Rosemount Model 444 consists of :

Sensor

The type of sensor depends on the range and application; eg:

  • Thermocouple – Type E, J, K, R, S, T.
  • RTD – Copper (I0 ê), Nickel (120 ê) and PT 100 ê with 2, 3 or 4 wire connections.

Electronics Unit

This unit has two boards.  A RANGE board, depending on the sensor in use and an AMPLIFIER / OUTPUT board which produces the standard 4 – 20mA signal for the control room.

Local Temperature Indicator

This unit may or not be included.  It provides either a moving coil type display or a digital display.  It gives an on-site temperature reading to the operator.

a typical installation for this transmitter. The accuracy of this transmitter is better than any pneumatic instrument. It is  0.2% of the calibrated span.

 

 

 

 

 

 

 

 

 

عن احمد عبد الوهاب

بكالوريوس هندسة كهربائية - الجامعة المستنصرية - بغداد . دبلوم الكترونيك - معهد التكنولوجيا - بغداد . عضو نقابة المهندسين العراقيين.

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