Clarity Hardware INT7 A/D CONVERTER

Significance of the topic

The INT7 A/D Converter represents a modern high-precision interface for converting analog detector signals into digital data within chromatography systems. Its 24-bit delta-sigma integration technology ensures minimal signal loss, high temperature stability and robust noise suppression. Reliable digitization is critical for accurate qualitative and quantitative analyses in pharmaceutical, environmental and industrial laboratories.

Objectives and study overview

This document reviews the INT7 hardware and software integration with Clarity chromatography station. It outlines system requirements, step-by-step installation, configuration in the Clarity environment, measurement setup and operational troubleshooting. Key design goals include multi-channel flexibility, precise synchronization and seamless user control.

Applied methodology and instrumentation

The INT7 uses delta-sigma continuous integration, avoiding sampling gaps and analog switch errors. Channels are independent 24-bit converters supporting bipolar and unipolar ranges (±156 mV to ±10 V). Four digital inputs (two optocoupled) and eight TTL outputs (first four with relay contacts) provide external start/stop synchronization and device control. Sampling rates range from 10 to 100 Hz.

Used Instrumentation

• INT7 A/D converter card (PCI, 32-bit, half-length)
• Clarity chromatography station software (version ≥ 2.7)
• Standard signal, marker and digital output cables with DB-37F connector
• Compatible Windows OS (7 SP1, 8.1, 10, 11; 32/64-bit as specified)

Main results and discussion

Integration into Clarity is achieved via the System Configuration dialog, assigning detector channels and digital I/O to instruments. Detector units can be scaled and inverted. Method parameters include input range selection, sample rate adjustment and external trigger definitions (Start Only, Start-Stop, Start-Restart). A Device Monitor allows real-time I/O status and manual output control. Troubleshooting covers driver reinstallation, hardware recognition and acquisition simulation modes.

Benefits and practical application of the method

The INT7 card delivers high resolution at low noise, facilitating detection of narrow chromatographic peaks. Modular channel assignment supports multi-detector setups and flexible autosampler synchronization. Temperature-stable performance enhances reproducibility in quality control and research environments.

Future trends and possibilities of use

Advancements may include higher sampling rates for ultra-fast chromatography, improved low-profile PCIe designs and deeper integration with cloud-based data analysis platforms. Expanded digital I/O capabilities could support more complex event sequencing and real-time process feedback.

Conclusion

The INT7 A/D Converter offers a reliable, high-resolution solution for chromatography data acquisition. Its combination of delta-sigma integration, flexible channel configuration and digital I/O synchronization meets the demands of modern analytical laboratories. Comprehensive software support and clear troubleshooting guidance ensure streamlined deployment and operation.

Reference

• DataApex Ltd., INT7 A/D Converter Manual, Code/Rev. M058/80E, February 2024