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Ap Charles
05/28/12 02:01
Read: 406 times

#187557 - safety
Responding to: Kai Klaas's previous message
Kai Klaas said:
Ap said:
bside the sensor is Ex approved but its GND on its body makes me suspicious.

Usually, if an EX sensor has a metallic housing, this is to be connected to earth. Inside electronics then is not connected to the metallic housing usually. Just the opposite: A test voltage of about 500V is applied between 0V of sensor circuit and metallic housing of sensor and the resulting leakage current must not exceed a certain limit.

Kai Klaas

Kai, as per your mail above a 1M resistor paralleled with 1.1....22nF capacitor is used, although it is for long running cables , but will it be beneficial to shunt the sensors floating terminal towards metallic PE, with this scheme.


List of 15 messages in thread
Sensor installing      AP Charles      05/24/12 02:13      
   EX question ?      Kai Klaas      05/24/12 06:04      
      Manufacturer      AP Charles      05/24/12 07:53      
         Never tested? So not certified?      Per Westermark      05/24/12 09:08      
            Is it undesirable      AP Charles      05/24/12 10:05      
               As far as I know...      Kai Klaas      05/24/12 12:37      
                  No No..      AP Charles      05/24/12 13:32      
                     I agree...      Kai Klaas      05/25/12 10:39      
                        safety      AP Charles      05/28/12 02:01      
                           Yes and no...      Kai Klaas      05/28/12 16:48      
                              Looking for Pre-Boxed Solutions      Michael Karas      05/28/12 18:02      
                                 pre-boxed solutions .. no      AP Charles      05/28/12 23:53      
                                    But there's more to do...      Kai Klaas      05/29/12 05:40      
                                       not familiar with 'EX'      Erik Malund      05/29/12 06:41      
                                       Yes      AP Charles      05/29/12 07:25      

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