The GSI 122/130 galvanic separation unit is designed for supplying transducers and conditioners while reading their output signals. It operates in 2-wire transmission systems and can power any electronic system with consumption below 20 mA.
This unit provides a voltage signal proportional to the current consumed by the conditioner, available for direct analysis. The GSI 122/130 prevents issues caused by voltage differences between measurement points and signal processing equipment, such as earth loops.
The GSI 122 Version 20x complies with CENELEC and CSA standards for powering equipment in explosive areas. It eliminates the need for Zener barriers, which typically introduce voltage drops and limit transmission line length and system dynamic range.
Technical Specifications
| Technical Parameter | Specification / Description |
| Supply voltage (to GSI) | +24 V ±5% (e.g. from UVC... processor) |
| Ripple (100 Hz) | 100 mV pp max. |
| Consumption | No load: Approx. 20 mA • 20 mA load: Approx. 60 mA • Short-circuit: Max. 120 mA |
| Output voltage (to conditioner) | No load: 18 V ±1 V • 20 mA: 16 V ±1 V |
| Short-circuit current | 60 mA |
| Pass-band | DC to 10 kHz ±0.5%, -1 dB at 20 kHz |
| Transfer function | 1 V/mA factory set (potentiometer P1) |
| Temperature drift | <200 ppm/°C |
| Linearity | ±0.5% over dynamic measuring range |
| DC signal component (to UVC) | Adjustable by potentiometer P2 • Umin. = +2 V • Umax. = power supply (+24 V ±5%) - 2.5 V |
| Noise (Max. residual on signal) | 12 mVpp at 5 mA DC • 25 mVpp at 12 mA DC |
| Galvanic separation | ≥4 kV RMS (between the input and output circuit) |
| Electrical connections | 5 lugs, type AMP-Faston 6.3 |
| Temperature range | Operation: 0°C to +55°C • Storage: -20°C to +70°C |
| Mechanical construction | Printed circuit board, potted, mounted in a plastic casing. Dimensions: 130 x 74.5 x 23 mm |
| Mounting | The unit is fixed by a single M4 screw and positioning lug (Ø4.5 mm). Refer to data sheet "Mounting accessories for GSI/GSV units". |
| Dimensions (Detailed) | Width: 23.0 mm • Height: 130.0 mm • Depth: 74.5 mm |
| Weight | Approx. 430 g |
| CENELEC/PTB certificate | Ex-80/2184, type EEx ib II C |
| CSA certificate | LR 62075-1, type EEx ia, class I, groups A, B, C, D. |
Frequently Asked Questions
- What is the purpose of the GSI 122/130 galvanic separation unit?
The GSI 122/130 is used to supply transducers and conditioners in 2-wire transmission systems and to read their output signals. It can also power any electronic system consuming less than 20 mA. - How does the GSI 122/130 assist in signal analysis?
The unit provides a voltage signal proportional to the current consumed by the conditioner, and this voltage is directly available for analyzing the conditioner's signal. - What problems does the GSI 122/130 help prevent?
It avoids issues caused by voltage differences between the measuring point and signal processing equipment, such as earth loops. - Why is the GSI 122 Version 20x suitable for explosive areas?
It conforms to CENELEC and CSA standards for powering equipment in explosive environments, eliminating the need for Zener barriers that cause voltage drops and reduce transmission line length and dynamic range.