A data logger records measurements from one or more sensors over time, storing them for later download and analysis. In Singapore's temperature-sensitive industries — pharmaceuticals, food and beverage, life sciences, logistics — data loggers are not optional accessories but regulatory requirements. Singapore's Health Sciences Authority (HSA) GDP guidelines, Singapore Food Agency (SFA) cold chain requirements, and ISO 9001 quality management systems all require documented environmental condition evidence. The right data logger is your compliance evidence trail.

Key Specifications

Measurement Parameters

Temperature-only loggers suit simple cold storage monitoring. Combination temperature + humidity loggers (Rotronic's range) add relative humidity — critical for pharmaceutical products, semiconductor components, and building materials sensitive to moisture. Specialised loggers measure CO2 (cleanrooms, controlled atmosphere storage), pressure differential (pharmacy compounding rooms), light exposure (light-sensitive pharmaceuticals), and shock/vibration (fragile goods logistics).

Measurement Accuracy

For Singapore pharmaceutical cold chain (2–8°C refrigerated, -15 to -25°C frozen), ensure the specified accuracy applies at actual storage temperatures, not a generic 20°C lab reference. Rotronic's HL-1D achieves ±0.3°C from -40 to +85°C — one of the most consistent accuracy profiles available and well-suited to pharmaceutical compliance requirements.

Wireless Connectivity

Wireless loggers transmit via Wi-Fi, Bluetooth, or cellular to central monitoring platforms — enabling real-time alerts during temperature excursions, reducing manual logger retrieval rounds. For Singapore pharmaceutical GDP compliance, real-time alerting is strongly preferred as it enables corrective action during excursions rather than discovering problems at scheduled download.

Recommended Loggers by Application

Pharmaceutical Cold Chain (HSA GDP Compliance)

Rotronic BL-1D (Bluetooth) and HL-1D (Wi-Fi): ±0.3°C accuracy, GDP-compliant RMS software with IQ/OQ validation documentation, alarm notifications for excursions, full compliance reporting. HSA-inspected Singapore pharmaceutical companies consistently use Rotronic loggers for their quality of compliance documentation. The BL-1D suits individual cold storage units; the HL-1D integrates into network-wide monitoring for pharmaceutical warehouses and hospital pharmacies.

Food Cold Chain (SFA Compliance)

Rotronic TL-1D (single-use) or CL-11 (reusable): For Singapore food importers monitoring cold chain continuity from port to retail, the TL-1D single-use logger provides a tamper-evident record for each shipment (pre-activated at origin, read at destination via smartphone app). The CL-11 reusable model provides ±0.3°C accuracy for regular SFA-inspected cold storage facilities.

Industrial Environmental Monitoring

Rotronic HL-20 Multi-Probe Logger: Accepts multiple external probe types (temperature, humidity, CO2, differential pressure), connects to RMS cloud platform for real-time monitoring across a facility. Preferred for Singapore semiconductor fabs, electronics manufacturers, and aerospace components stores monitoring multiple critical environments from a single system.

Power Quality Data Logging

Fluke 1760 Power Quality Recorder: Records all IEC 61000-4-30 Class A power quality parameters simultaneously across three phases plus neutral. For Singapore facilities monitoring voltage sags, swells, harmonic trends, and energy consumption under the Energy Conservation Act.

Calibration Requirements

HSA GDP guidelines explicitly require temperature monitoring devices to be calibrated at regular intervals with traceable certificates. Unitest Instruments provides SAC-SINGLAS-accredited calibration for Rotronic temperature and humidity data loggers — certificates meet HSA, ISO, and international GDP requirements. Pre-calibrated Rotronic loggers can be supplied with certificates for immediate compliance use.