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Engineered for ABB Bailey INFI 90 Signal Isolation
This isolator breaks ground loops and protects analog measurement circuits. It provides intelligent isolation for the ABB Bailey INIIL02-H unit. You will find this isolator in INFI 90 systems with long field wiring. Unlike basic isolators, this version includes loop diagnostics. It monitors 4-20 mA signals for open-circuit and short-circuit conditions.
Technical Specifications & Physical Dimensions
We designed this loop isolator for reliable analog signal integrity. The table below presents all verified technical specifications.
| Parameter | Specification |
|---|---|
| Physical Dimensions (W x H x D) | 140mm x 110mm x 45mm |
| Total Weight | 0.44 kg (440 grams) |
| Number of Channels | 1 independent loop |
| Input Signal Range | 4-20 mA (active or passive) |
| Output Signal Range | 4-20 mA (proportional) |
| Isolation Voltage | 1500V AC (input to output) |
| Accuracy | ±0.1% of full scale |
| Loop Voltage Drop | 2.5V maximum |
Functional Architecture and Diagnostic Features
This isolator connects between field transmitters and I/O modules. It uses a transformer-coupled design for complete isolation. You can install the unit with active or passive loop-powered transmitters. Moreover, the isolator includes intelligent fault detection circuitry. This component detects open sensors and shorted wiring automatically. Consequently, operators receive immediate alerts for loop failures.
Installation and Operational Guidelines
The ABB Bailey INIIL02-H consumes 20 mA from the 24V DC supply. It introduces only 2.5V of loop voltage drop during operation. You must mount the isolator on DIN rail inside the control cabinet. Always wire the input before the output when connecting transmitters. This practice ensures proper loop startup sequencing. Furthermore, the isolator includes an LED status indicator for loop health. This feature shows normal operation, open circuit, or short circuit conditions.
Physical Characteristics and Environmental Limits
This loop isolator has a rugged, industrial-grade plastic housing. Its lightweight 0.44 kg design allows for easy DIN rail mounting. The layout follows ABB Bailey standard INFI 90 specifications. Therefore, it fits securely in crowded control cabinets. The isolator requires 30mm clearance for ventilation. In addition, it maintains stable operation between -10°C and 55°C ambient temperature. You can store this unit safely between -25°C and 70°C.