| ??? 05/28/12 08:01 Read: times |
#187557 - safety Responding to: ???'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 http://www.8052.com/forum/read/127782 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. -Ap |
| Topic | Author | Date |
| Sensor installing | 01/01/70 00:00 | |
| EX question ? | 01/01/70 00:00 | |
| Manufacturer | 01/01/70 00:00 | |
| Never tested? So not certified? | 01/01/70 00:00 | |
| Is it undesirable | 01/01/70 00:00 | |
| As far as I know... | 01/01/70 00:00 | |
| No No.. | 01/01/70 00:00 | |
| I agree... | 01/01/70 00:00 | |
| safety | 01/01/70 00:00 | |
| Yes and no... | 01/01/70 00:00 | |
| Looking for Pre-Boxed Solutions | 01/01/70 00:00 | |
| pre-boxed solutions .. no | 01/01/70 00:00 | |
| But there's more to do... | 01/01/70 00:00 | |
| not familiar with 'EX' | 01/01/70 00:00 | |
Yes | 01/01/70 00:00 |