LACROIX Sofrel S4W - 8 Al-mA Expansion Module Details; 8 Al-mA Input Connection; 8 Al-mA Technical Specifications

8AI-mA Expansion Module
8AI-mA Expansion Module
Connection of AIs (4-20mA)
This type of AI is a ‘4-20mA Current’ measurement input. Only sensors delivering a current source free from any reference with respect
to Ground and, in all cases, several sources having no common point between them, are directly compatible with our materials (‘floating’
output).
Otherwise, the installer must provide a galvanic isolation device in the ‘RTU – Sensor’ link.
Installation of surge arresters:
All SOFREL sensors come with inbuilt surge protection. However, if the ‘RTU –
Sensor’ link cable runs
outside of building or extends a significant length (> 200 metres), a 4-20 mA surge arrester should
be installed on the RTU side.
Example for 2 AIs, ‘4-20mA’:
Technical specifications
- 8 ANA inputs
- 4-20 mA current measurement
- Precision: 0.1% (25°C)
- Resolution: 16 bits
- Remote power feed
- 2 sensors per remote power feed
- Voltage: V
EXT -2V (VEXT = 24 VDC power feed)
- Protection current = 50 mA (shared protection for 2 inputs)
- Input impedance:
- 100
Ω
I/O Module
AI 4-20mA cable
Sensor
Wiring a surge arrester
(Case for autonomous sensor)
(Case for remotely powered sensor)
1 pair for ANA input no.1
1 pair for ANA input no.2
Sensor, 4-20 mA