What is the leading ignition protection type for UHP pressure transducers?

The leading ignition protection type is crucial for the electrical connection of a pressure sensor with explosion protection. It does not necessarily must be the one with the stricter requirements. This applies, for example, for the UHP pressure transducers of the WU series from WIKA. They are designed for used in semiconductor production.
Explosion protection can be an indispensable safety precaution there. The reason being the substances required for manufacturing include highly flammable gases. Consequently, there is a threat of an explosive atmosphere forming.
Explosion protection concept
UHP pressure transducers for such processes must be designed with the corresponding safety. Along with their small design and specific process connections, the models WUC-1x and WU-2x have a comprehensive explosion protection concept. The marking of the instruments provides info on this:
II 3G Ex ec ic IIC T6/T5/T4 Gc X
The abbreviations listed inside them mean, in greater detail:
II 3G:
Equipment group 2 (every area except mining), may be used in zone 2 (rare and short-term Ex atmosphere).
Ex ec ic:
Ignition protection types ?ec? (increased safety) and ?ic? (intrinsically safe; zone 2).
?Ex ec? has replaced the ignition protection type ?Ex nA? (non-sparking) since the start of 2022. However, this does not affect the Ex concept of the instruments.
IIC:
Explosion group (here: gases, resistive ignition energy of 40 �J, ideal for hydrogen/acetylene).
T6/T5/T4:
Temperature classes. T6 because the highest requirement means a maximum permissible surface temperature in the Ex environment < 85 �C (max. surface temperature of the WUC-1x and WU-2x: 40 �C).
Gc:
?Equipment Protection Level? (EPL) for zone 2 per IEC 60079-0
X:
Specific requirements which are listed in the operating instructions (for example, the best mating connector).
?ec? is the leading ignition protection type
It really is noticeable that the marking contains two ignition protection types. However, only one is pertinent for the electrical connection: the best ignition protection type. In the case of the pressure transducers from the WU series, here is the Ex ec (Ex nA up to 2022) mentioned first and not the stricter Ex ic. This can also be seen in the bond values in the data sheet and operating instructions. Only the specification of the maximum supply voltage UN = 30 V, that is also stated in the IECEx certificate, is pertinent here.
What does the classification ?Ex ic? stand for? It only pertains to the potentiometer of the transducer. The resistive component comes with an intrinsically safe circuit and will therefore be adjusted to improve zero drift during operation. Within their overall form, the WU models usually do not require an intrinsically safe circuit. However, they must never be disconnected from the circuit during operation or when an Ex atmosphere exists.
Note
Further information on the WUC-1x and WU-2x UHP pressure transducers and about hydrogen can be found on the WIKA website. When you have any questions, your contact will gladly help you.
Also read Price : The most frequent ignition protection types for sensors in gas hazardous areas
Ex protection: The difference between your zone and division model

1 thought on “What is the leading ignition protection type for UHP pressure transducers?”

  1. После перехода на здоровое питание, я осознал, насколько важен свежий, натуральный продукт. Благодарю ‘Все соки’ за их качественный маслопресс. Теперь я делаю своё собственное масло дома, что гарантирует его чистоту и натуральность. https://h-100.ru/collection/maslopressy – Маслопресс – это было отличное вложение в моё здоровье!

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