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Trackwork and point machines
Possible applications:
- Rail temperature
- Rail vibration
- Points load pin
- Clamp lock power pack monitoring
- Points position monitoring
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Special care must be taken when attaching sensors to rails, pointwork, point machines or anything electrically connected to them.
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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Other measurements
The 4-20mA analogue input card can be used with many other transducers, including temperature, pressure etc.
Parameter | Suggested 4-20mA device |
|---|---|
Temperature | Phoenix Contact MINI MCR-SL-TC-UI(-NC) |
Strain / force | Strainstall provide a wide range of sensors for measuring force in many different situations. |
Flow | Omega FMG203-NPT |
Wind speed | Vector Instruments (4-20mA special order) |