Fluke 2625A HYDRA Series II Datalogger

The Fluke 2625A HYDRA Series II is a 21-channel data acquisition and logging system engineered for industrial and laboratory environments requiring simultaneous multi-parameter measurement. It acquires DC voltage, AC voltage, temperature via thermocouple (J, K, N, E, T, R, S, B, C) and RTD inputs, resistance, and frequency data across front-panel and rear-module channels. The removable Universal Input Module enables rapid reconfiguration without external signal conditioning, while automatic thermocouple reference junction compensation operates via the isothermal block temperature sensor.

Technical Specifications

Measurement Channels & Input:

• 21 analog input channels total (Channel 0 front panel; Channels 1–20 rear module)


• Removable Universal Input Module with integrated signal conditioning


• Supported thermocouple types: J, K, N, E, T, R, S, B, C Data Acquisition Performance:


• Fast rate: 17 readings/second nominal


• Slow rate: 4 readings/second nominal


• Continuous, interval, single, and triggered (internal/external) scan modes


• Single-channel monitoring during multi-channel scanning Memory & Data Storage:


• Non-volatile memory: 2047 scans across up to 21 channels (~42,987 total readings)


• Stores minimum, maximum, and most recent measurements per channel


• Configuration and calibration data retention


• Memory life: ≥10 years minimum Environmental & Power:


• Operating temperature: 0°C to 60°C (≤90% RH at 0–28°C)


• AC or DC powered


• Automatic data recovery and resume on power restoration

Key Features

• Automatic thermocouple reference junction compensation


• Flexible data retrieval via modem, RS-232 to PC, or direct upload


• Portable form factor for field and bench deployment


• Power-loss resilience with configuration retention

Typical Applications Process monitoring, quality control, thermal characterization, and multi-parameter research data collection in industrial and laboratory settings.

Compatibility & Integration RS-232 interface for direct PC connection and real-time data transfer. Modem connectivity for remote monitoring and data retrieval.