×
Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 109761728, Entry date: 10/26/2018
(0)
Rate

Is it allowed to power an "intrinsically safe" 2-wire transmitter with a standard "non-intrinsically safe" power supply?

  • Entry
  • Associated product(s)

Question:

Is it allowed to power an "intrinsically safe" transmitter with a standard "non-intrinsically safe" power supply?

Answer:

No. You will lose your intrinsically safe certification immediately and irreversibly.

Assuming you need to pre-programm an intrinsically safe 2-wire transmitter and you are currently in a safe area (for example in your workshop) - you might be tempted to power the device with a standard non-intrinsically power supply. But if an intrinsically safe transmitter is connected to a standard power supply, destruction of internal components may occur. As a result, the Ex approval of the transmitter expires. This problem can be avoided by using an intrinsically safe HART isolating power supply, e.g. SITRANS I100 7NG4124-0AA00.


This device is powered by an external power source. At the input the Ex-transmitter is connected.
Via the output (4..20mA signal with HART) the device is programmed on the safe side with a programming tool (wiring see picture).
 



If you have further questions, please contact our technical support.


Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
https://www.siemens.com/cybersecurity#Ouraspiration.