Important general considerations
Great care must be taken when adding datalogging to railway signalling systems.
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Measurement type | Current clamp | Rating | No of turns | ||
|---|---|---|---|---|---|
DC track circuits | Rowe Hankins NIC361-6A | 600mA DC | 1 | ||
AC track circuits | Northern Design XD-I420-1 | 5A AC | 5MPEC VTi21 | 1A to 100A AC | 1 |
Points motor current | LEM PointSenz PCM20P | 20A DC | 1 |
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- Rail temperature
- Rail vibration
- Points load pin
- Clamp lock power pack monitoring
- Points position monitoring
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| Warning |
|---|
| Note |
Special care must be taken when attaching sensors to rails, pointwork, point machines or anything electrically connected to them. |
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Sensor requirements:
- Each sensor must have electrical isolation between the 4-20mA output and the trackwork to a minimum of 4M Ohms at 250V.
- 250mA fuses must be provided in each leg of the current loop.
- Only Network Rail approved points load pins may be used.
- When monitoring the pressure in clamp lock power packs, only pressure sensors approved by the manufacturer of the power pack must be used.
- Where sensors are attached to both rails, a risk assessment must be carried out to ensure that there is no risk of a track circuit being false fed
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