BasicLine BL 540, DIN Rail Loop-Powered Signal Isolator
- Loop-powered design (no separate power supply required)
- Input/Output: 0–20 mA or 4–20 mA
- Galvanic isolation between input and output, 1.5 kV test voltage
- Accuracy: < 0.2 % full scale
- Low voltage drop: approx. 1.7 V at 20 mA
- Cutoff frequency > 100 Hz
- Operating temperature: 0 … +55 °C
- Available in 1-channel (BL 541) or 2-channel (BL 542) versions
- Slim 6.1 mm housing, DIN rail EN 60715
The BasicLine BL 540 is a loop-powered isolator designed for safe and interference-free transmission of analog current signals. It provides full galvanic isolation between input and output, preventing ground loops and protecting measurement and control systems from disturbances.
Because the BL 540 is loop-powered, no external power supply is required, reducing wiring complexity and installation costs. The isolator supports standard 0–20 mA and 4–20 mA signals with a low voltage drop of just 1.7 V at 20 mA, ensuring compatibility with most transmitters and control systems.
Available in both single-channel (BL 541) and dual-channel (BL 542) models, the BL 540 offers maximum flexibility while saving space with its 6.1 mm DIN-rail housing. Its wide operating temperature range and high cutoff frequency (>100 Hz) make it well suited for industrial and process automation applications.
| Input Type | 0 - 20 mA |
| 4 - 20 mA | |
| # of Inputs | 1 |
| 2 | |
| Output Type | 0 - 20 mA |
| 4 - 20 mA | |
| Max Bandwidth | 100 Hz |
| Isolation | Yes |
| IP Rating | IP 20 |
| Min Temperature | 0°C |
| Max Temperature | 55°C |
Applications:
-
Isolation of 4–20 mA process signals
-
Prevention of ground loops in control systems
-
Compact signal conditioning in space-limited panels
-
Protection of PLC and PCS inputs from interference
-
Industrial automation and monitoring
| BL 541 | 1-channel version |
| BL 542 | 2-channel version |
BL 540 Lop powered isolator Datasheet |
- Universal input ranges: 0–20 mA, 4–20 mA, 0–10 V (calibrated switching)
- Matching output ranges: 0–20 mA, 4–20 mA, 0–10 V
- Galvanic 3-port isolation (input/output/power supply), 1.5 kV test voltage
- Cutoff frequency > 100 Hz
- Gain error < 0.3 % full scale
- Power supply: 24 V DC or 100–230 V AC (48–62 Hz)
- Slim DIN-rail housing, 12.5 mm width
| Input Type | 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
| # of Inputs | 1 |
| Output Type | 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
| Max Bandwidth | 100 Hz |
| Isolation | Yes |
| Supply Power | 24 V DC |
- Input: 0–20 mA or 4–20 mA
- Two galvanically isolated outputs (0–20 mA or 4–20 mA)
- Both outputs support up to 400 ohms load each, or 800 ohms combined in series
- Galvanic 4-port isolation (input, outputs, power supply), 1.5 kV test voltage
- Gain error < 0.3 % full scale
- Cutoff frequency > 100 Hz
- Operating temperature: 0 … +55 °C
- Slim 6.1 mm DIN-rail housing
| Input Type | 0 - 10 V AC, 0 - 20 mA |
| # of Inputs | 1 |
| Output Type | 0 - 20 mA, 4 - 20 mA |
| Max Bandwidth | 100 Hz |
| Isolation | Yes |
| Supply Power | 24 V DC |
- Compatible with Pt100, Pt1000, and thermocouples (J, K)
- Automatic recognition of 2-, 3-, or 4-wire RTD connections
- Output options: 0(4)–20 mA, 0–10 V, 0–5 V
- 6 mm slim modular housing, DIN-rail mounting
- Galvanic 3-port isolation between input, output, and power supply
- High measurement accuracy with innovative circuit design
- CE compliant and UL approved
| Input Type | Thermocouple |
| # of Inputs | 1 |
| Output Type | 0 - 5 V DC, 0 - 10 V DC, 0 - 20 mA, 4 - 20 mA |
| Max Bandwidth | 3 Hz |
| Isolation | Yes |
| Supply Power | 24 V DC |