DaqLink Four-Channel Data Logger

Overview

The DaqLink Four-Channel Data Logger is a compact, field-deployable USB-based data acquisition unit engineered for long-term environmental and industrial parameter monitoring. Built on a robust embedded architecture, it employs high-stability analog-to-digital conversion (16-bit resolution) and precision signal conditioning to ensure measurement integrity across temperature, relative humidity, and up to four user-configurable external sensor inputs (voltage, current, or resistance-based). Its dual-mode operation—standalone logging with local LCD feedback or real-time PC-connected acquisition—enables flexible deployment in unattended indoor environments (e.g., laboratories, server rooms, cleanrooms) and semi-exposed outdoor locations (e.g., building façades, agricultural enclosures, HVAC ducts). The device complies with IEC 61000-4 electromagnetic compatibility standards and operates reliably within a certified ambient range of –20 °C to +50 °C, making it suitable for continuous GLP-aligned monitoring where traceability and repeatability are essential.

Key Features

• Integrated high-accuracy temperature and relative humidity sensors (±0.5 °C, ±3% RH typical accuracy) with factory calibration certificates traceable to NIST standards
• Four isolated analog input channels supporting 0–5 V, 0–10 V, 4–20 mA, or PT100/PT1000 configurations via configurable terminal blocks
• Two-line, 16-character backlit LCD display enabling real-time value viewing, menu navigation, and alarm status indication without PC dependency
• Rechargeable 4.8 V NiMH battery system delivering up to 6 months of continuous logging at 1-minute intervals; supports simultaneous charging via internal smart charger or external 12 V DC input
• IP54-rated enclosure providing protection against dust ingress and water splashes from any direction—validated per EN 60529
• Configurable threshold-based alarm system: four independent setpoints with visual (LCD icon + LED flash) and audible (piezo buzzer) alerts
• Circular or linear memory storage modes; onboard non-volatile flash memory retains >1 million data points with time-stamped UTC synchronization

Sample Compatibility & Compliance

The DaqLink accepts standardized analog signals from third-party transducers compliant with ISO 80000-8 (quantities and units for acoustics, vibrations, and shock), including thermocouples (Type K/J/T), RTDs, pressure transducers, CO₂ sensors, and particulate matter monitors. All firmware and hardware design adhere to RoHS 2011/65/EU and REACH (EC 1907/2006) directives. Data integrity protocols align with FDA 21 CFR Part 11 requirements for electronic records—audit trails, user authentication, and immutable timestamping are enforced through the DaqLink software suite. Device configuration and calibration logs meet ISO/IEC 17025 documentation expectations for accredited testing laboratories.

Software & Data Management

The DaqLink Windows®-based software (v5.2+, compatible with Windows 10/11 x64) provides full lifecycle instrument control. It enables real-time streaming visualization, multi-channel overlay graphs with customizable axes and scaling, and automated export to CSV, XLSX, or PDF report templates. Users may define custom sensor transfer functions (linear, polynomial, lookup table), perform two-point or multi-point calibration with certificate generation, and schedule periodic firmware updates via USB. All calibration parameters—including date, operator ID, reference standard ID, and deviation values—are stored in encrypted metadata. Data files include embedded SHA-256 checksums to prevent tampering, satisfying GMP Annex 11 and EU GMP Chapter 4 audit requirements.

Applications

• Continuous indoor air quality (IAQ) monitoring in pharmaceutical manufacturing suites, validating HVAC performance against ISO 14644-1 Class 5–8 cleanroom specifications
• Environmental validation of cold chain logistics: temperature/humidity mapping during warehouse qualification and transport simulation studies
• Field-deployed microclimate tracking in agritech applications—soil moisture correlation, greenhouse climate profiling, and irrigation scheduling support
• Energy efficiency audits: simultaneous recording of supply/return air temperatures, differential pressures, and fan motor current draw in commercial HVAC systems
• Educational laboratory use for sensor physics experiments, signal conditioning fundamentals, and time-series data analysis coursework

FAQ

Does the DaqLink support Modbus or other industrial communication protocols?
No—DaqLink communicates exclusively via USB 2.0 (Micro-B interface); it does not feature RS-485, Ethernet, or wireless connectivity.
Can external sensors be calibrated directly through the device’s front panel?
No—calibration requires connection to a Windows PC and use of the DaqLink software; no manual trim-pot or offset adjustment is available on-device.
Is the internal temperature/humidity sensor replaceable or field-serviceable?
The integrated sensor module is sealed and non-user-replaceable; recalibration or replacement must be performed by an authorized service center.
What is the maximum sampling interval resolution?
Sampling intervals are programmable from 1 second to 24 hours in 1-second increments; minimum inter-sample delay is governed by analog settling time and ADC conversion latency.
Does the device meet ATEX or IECEx certification for hazardous areas?
No—DaqLink is rated for general-purpose use only and is not certified for explosive atmospheres (Zone 0/1/2 or Class I/II/III divisions).