Kobold Heinrichs TM, Supplementary Operating Manual

Page: 10 / 20

Heinrichs Messtechnik GmbH
Page 10 of 20 TM/TMU/TM-SH Supplement Manual
For Explosion Flow-meters
3.5 Electrical Parameters
Warning
To ensure compliance with the requirements for explosive atmospheres, it is essential
that the maximum electrical and thermal values set forth below are observed
3.5.1 Exciter circuit (terminals 8 and 9)
3.5.1.1 For exciter circuit type EC1
Voltage Ui 30 V
Current Ii 90 mA
Power Pi 0.4 W
Effective internal capacitance Ci negligible
Effective internal inductance Li 4.38 mH
3.5.1.2 For exciter circuit type EC2
For connecting an intrinsically safe circuit with an Ex ia IIC type of protection, linear output
characteristic and the following maximum values:
Voltage Uo 30 V
Current Io 90 mA
Power Po 1 W
Effective internal inductance Li 4.38 mH < Li < 220 mH
3.5.2 Sensor circuits (terminals 1 – 2 and 3 – 4)
Voltage Ui DC 30 V
Current Ii 50 mA
Power Pi 0.300 W
Effective internal capacitance Ci negligible
Effective internal inductance Li 14 mH
Output voltage Uo AC 0.3 V
3.5.3 Temperature sensor circuits (terminals 5 to 7)
Voltage Ui DC 30 V
Current Ii 100 mA
Power Pi 0.333 W
Effective internal capacitance Ci negligible
Effective internal inductance Li negligible