Elgas EDT 101, User Manual

Page: 7 / 40

7
2
Device overview
2.1 Technical Description
Chyba! Nenalezen zdroj odkazů. shows functional diagram of the transducer. Temperature is
measured by platinum resistive sensor. The signal from the sensor is converted by a high-
resolution analog-to-digital converter into digital form and processed by the microcontroller.
Microcontroller digitally compensates the non-linearity of the sensor using calibration data.
The calibration data is stored in non-volatile EEPROM memory during transducer
manufacturing.
Temperature readout as well as all control functions are accessible via RS 485 interface. The
transducer is capable to measure the temperature on request or continuously in preset time
intervals and store values in its internal memory for later retrieval.
Analog-to-Digital
Converter
Voltage
Regulator
Microcontroller
Driver / Receiver
RS485
EEPROM
Memory
Regulated
Power Supply
RS485
Bus
Power
Supply
Uref
Rn
Pt 1000
Uref
Rn
Pt 1000
Figure 1. Functional diagram of the transducer
Physically, the transducer consists of the temperature sensor mounted in stainless-steel stem
50 mm long and the cable. A cylindrical plastic case with electronics is integrated into the
cable.
200 64
17
5
.7
50
Figure 2. Dimensional drawing of the transducer.