Product Core Brief
- Model: AL81G
- Brand: Acquisition Logic
- Series: AL series acquisition hardware
- Core Function: Conditions and converts field signals into digital data for a host acquisition system, handling analog or discrete input channels on a defined channel map.
- Product Type: Data acquisition / signal conditioning module
- Key Specs: Fixed channel configuration | Signal conditioning front end | Host interface per variant
- Condition: New Original / New Surplus (condition stated per line item on quotation)
Transparency note: The AL81G designation identifies the hardware article and variant. Channel count, input range, and sampling behavior are defined by the firmware and the host configuration file, not by the model number alone. Confirm the nameplate of the unit being replaced.
Key Technical Specifications
| Category | Parameter | Value |
|---|---|---|
| Identification | Full Model | |
| Identification | Manufacturer | Acquisition Logic |
| Function | Module Type | Data acquisition / signal conditioning module |
| Function | Role in Topology | Sits between field sensors and the host acquisition system; owns no control logic |
| Compatibility | Replacement Rule | Model, revision, channel map, and host configuration must match the original |
| Mounting | Installation | Chassis slot or panel mount, per variant |
| Communication | Interfaces | Host bus or serial/Ethernet link per configuration |
| Maintenance | Hot Swap | Not supported — full system power-down required |
| Electrical | Supply | External DC or chassis supply, per specification |
| Environment | Operating Condition | Enclosed chassis or instrument panel; temperature limits apply |
| Failure Signature | Common Symptoms | Channel dropout, invalid readings, host communication timeout |
| Supply | Lead Time | In-stock models ship within 48 hours |
Product Introduction
The AL81G is an Acquisition Logic data acquisition module used in test systems, monitoring panels, and industrial measurement applications. It conditions field signals and converts them into digital data for the host system.
For this part the replacement risk is configuration, not hardware. A module that powers up and communicates can still report wrong values if the channel map, input range, or firmware revision does not
match the original. Verify the nameplate, the firmware version, and the host configuration backup before ordering.
QA & Testing SOP
Identical for new original and surplus. No shortcuts.
- Inbound verification. Model, revision, serial number, and firmware label photographed and matched against the customer’s acquisition system documentation. Mismatched revisions are quarantined.
- Physical inspection. Connectors, pins, and board examined under magnification for rework, oxidation, or bent-pin damage.
- Bench power-up. Powered through a current-limited supply; startup sequence and self-diagnostics logged.
- Channel exercise. Each input channel exercised with a calibrated signal source and a Fluke multimeter on readback. Every channel verified, not sampled.
- Anti-static packaging. Moisture-barrier bag, desiccant, ESD label. Signed test record packed with the unit.
Installation Pitfalls & Guide
❗ Channel map mismatch. A replacement module with a different channel assignment or input range will communicate normally and then report scaled or misrouted values. Load the validated configuration and confirm the revision.
❗ Firmware incompatibility. Firmware differences can change sampling behavior or host protocol handling, producing intermittent timeouts that look like hardware failure.
❗ Signal wiring errors. Swapped or floating sensor connections are a more frequent cause of invalid readings than module failure. Verify against the photographed wiring reference.
❗ Cabinet environment. Dust, humidity, or degraded ventilation will destroy the replacement on the same timeline as the original. Correct the enclosure condition during the outage.
Replacement sequence:
- Pre-install — Confirm safe system state, apply lockout/tagout, photograph nameplate, position, and cable routing.
- Removal — De-energize fully and verify zero voltage, release retention, extract without stressing connectors.
- Install — Mount in the same position, reconnect wiring against the photographed reference, torque terminals to OEM specification.
- Power-on test — Verify communication with the host, load firmware and configuration, validate each channel against a known reference, then return to service.
Technical FAQ
Can I substitute a different AL-series model if the exact one is unavailable? Only after engineering review. Model differences can change channel count, input range, or protocol behavior, and a mismatch may communicate yet report invalid data.
Is hot swap supported? No. The module is not hot-swappable. Full system power-down is required before removal.
Why does the replacement module report invalid readings after install? Most often it is not the module. Check channel map, firmware revision, configuration load status, sensor wiring continuity, and reference grounding.
What warranty applies? New original units carry standard coverage as stated on the quotation. Surplus units carry a shorter, disclosed term confirmed before payment.
Is the AL81G still supported? Acquisition Logic supports its AL platform, but individual models move toward channel inventory over time. That makes revision, channel map, and lead-time confirmation more decisive than unit price on this part.
