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Key Technical Specifications
| Parameter | Value |
|---|---|
| Product family | Autronica AL-100 |
| Primary product variant | AL-100/AI8EX |
| Functional category | Analog input node |
| Associated transducers | GT-250 Series pressure transducers |
| Input application | Analog pressure-transducer signal acquisition |
| Intrinsic-safety output voltage UoU_o | 12 V |
| Intrinsic-safety output current IoI_o | 30 mA |
| Intrinsic-safety output power PoP_o | 43 mW |
| Maximum external capacitance CoC_o | 1.5 µF |
| Maximum external inductance LoL_o | 40 mH |
| Operating temperature | −20 to +70 °C |
| Reported weight, AL-100/AI8EX | Approximately 1.15 kg |
| EX-LON variant | AL-100B/LNG |
| EX-LON repeater variant | AL-100B-RPEX |
| Power/repeater variant | AL-100-RPEX |
| Communication-adapter variant | AL-100-SLTA-2D |
| Reported application | Marine automation, pressure monitoring, and EX fieldbus systems |
| Certification | Verify the exact hazardous-area approval from the nameplate and certificate |
| Supply voltage for complete unit | Verify for the exact variant |
| Terminal pinout | Verify from the applicable Autronica manual |
Public listings identify the AL-100/AI8EX as an analog input node for GT-250 Series pressure transducers. Reported intrinsic-safety parameters are 12 V, 30 mA, 43 mW, 1.5 µF maximum capacitance, 40 mH maximum inductance, and an operating range of −20 to +70 °C. The AL-100 family also includes separate power/repeater and communication-adapter variants, so the suffix must be matched exactly.
Product Introduction
The Autronica AL-100/AI8EX is an analog input node for GT-250 Series pressure-transducer applications in marine and hazardous-area automation systems. It provides an intrinsically safe interface between compatible transducers and the Autronica fieldbus or control architecture.
Do not treat “AL-100” as a complete part number. AI8EX, A18EX, RPEX, and SLTA-2D identify different functions. Confirm the suffix, hazardous-area certification, transducer type, fieldbus architecture, and terminal wiring before ordering or installation.
AL-100/AI8EX
AL-100/AI8EX
AL-100/AI8EX
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Pressure value is missing | No node power, open field cable, failed transducer, or node fault | ✅ High | Verify the approved supply and measure the transducer loop only with an intrinsically safe test method | Check power, cable continuity, and transducer status before replacing the node |
| Pressure value is fixed at zero | Open circuit, incorrect polarity, wrong transducer, or failed input channel | ✅ High | Compare field wiring with the approved drawing and verify the transducer’s expected signal at the node interface | Correct wiring and confirm transducer compatibility before replacing the AL-100/AI8EX |
| Pressure value is fixed at maximum | Short circuit, incorrect scaling, signal saturation, or input fault | ✅ High | Check for a field short and compare the control-system scaling with the transducer range | Verify scaling and field wiring before condemning the input node |
| Reading fluctuates rapidly | Loose terminals, shield problem, damaged cable, unstable transducer, or noise | ✅ Medium | Monitor the signal with an approved intrinsically safe meter and inspect shield termination | Repair the field circuit and grounding arrangement before replacement |
| Several pressure channels fail together | Shared power, fieldbus, barrier, or common wiring failure | ❌ Low to medium | Determine whether all affected nodes share the same supply or communication segment | Diagnose the common infrastructure first |
| Node is not visible on the fieldbus | Addressing, bus wiring, repeater, power, or communication fault | ❌ Low to medium | Check bus termination, node address, segment voltage, and controller diagnostics | Verify the network before replacing the analog node |
| Node trips an EX or isolation fault | Exceeding UoU_o, IoI_o, PoP_o, CoC_o, or LoL_o limits; wiring fault; wrong device | ✅ High | Compare the connected transducer and cable parameters with the approved intrinsic-safety calculation | Stop testing and verify the complete Ex loop with the responsible engineer |
| Pressure channel works intermittently | Moisture, corrosion, vibration, loose connector, or thermal stress | ✅ Medium | Inspect connectors and junction boxes, then trend the signal while checking cabinet temperature | Correct environmental and mechanical issues before replacement |
| Communication recovers after power cycling | Firmware state, unstable supply, bus collision, or failing node | ✅ Medium | Record diagnostics before cycling power and monitor supply and bus status during restart | Capture evidence first; replace only if the fault follows the node |
| Replacement node powers up but gives no reading | Wrong AL-100 variant, incompatible transducer, wrong address, or configuration mismatch | ✅ High | Compare the exact suffix, configuration file, node address, and transducer model | Do not commission until the variant and field-device compatibility are confirmed |
| Unit shows corrosion or water ingress | Marine condensation, salt contamination, or enclosure failure | ✅ High | Isolate the equipment, photograph damage, and inspect cable glands and enclosure seals | Quarantine the unit and correct the environmental cause |
| Current exceeds the listed limit | Short circuit, incorrect load, wiring error, or internal failure | ✅ High | Measure only with approved intrinsically safe equipment and compare with the 30 mA limit | Remove the circuit from service and investigate before re-energizing |
Critical warning: The AL-100/ is associated with intrinsically safe circuits. Do not substitute meters, barriers, transducers, cable lengths, or field devices without checking the approved Ex documentation. If the fault remains unclear, contact technical support with the exact suffix, nameplate, Ex certificate, transducer model, loop calculation, field measurements, bus diagnostics, and wiring photos.
Frequently Asked Questions (FAQ)
What is the Autronica AL-100/?
It is an analog input node associated with GT-250 Series pressure transducers. The designation is important because other AL-100 variants perform different functions.
Is AL-100 the complete model number?
No. AL-100 is a product family reference. Public listings show AL-100/ analog input nodes, AL-100/A18EX analog input nodes, AL-100-RPEX power/repeater units, AL-100B-RPEX EX-LON repeaters, and AL-100-SLTA-2D communication adapters.
What are the intrinsic-safety limits for the variant?
Reported values are Uo=12 VU_o = 12\ V, Io=30 mAI_o = 30\ mA, Po=43 mWP_o = 43\ mW, Co=1.5 μFC_o = 1.5\ \muF, and Lo=40 mHL_o = 40\ mH. Verify these values against the exact certificate and nameplate for the unit being installed.
Can I replace an AL-100/ with an AL-100/RPEX?
No. The is an analog input node, while the RPEX is a power and repeater unit. Their functions, terminals, fieldbus roles, and safety parameters differ. Match the complete model suffix, not just the AL-100 prefix.
Can I connect any 4–20 mA pressure transmitter to the ?
Do not assume compatibility. The node is publicly associated with GT-250 Series pressure transducers, and the intrinsic-safety entity parameters must match the complete field circuit. Verify the transmitter, cable, barrier, capacitance, inductance, current, and power calculations before connection.
Can I hot-swap the AL-100/?
Do not hot-swap it unless the approved Autronica and hazardous-area procedures explicitly allow the operation. Isolate the circuit, follow the vessel’s lockout procedure, and confirm the area classification and gas-free requirements before opening or replacing equipment.
Why is a used AL-100/ cheaper than a factory replacement?
Legacy marine and EX modules may be sold as used, surplus, or refurbished stock. The listing should identify the exact suffix, condition, certification status, and test scope. Request clear photos of the nameplate, Ex markings, connectors, corrosion condition, functional test report, warranty, and traceability before purchase.
