Dickson TP425

The Dickson TP425 is a dual-channel data logger for temperature and humidity monitoring in controlled environments. It combines an internal digital temperature sensor with a monolithic RH IC humidity sensor, delivering ±0.8°F (±0.5°C) accuracy across the primary operating range and ±1.8°F (±1.0°C) at temperature extremes. The unit stores up to 32,512 sample points with configurable logging intervals from 1 second to 24 hours. A 2.5-digit LCD display shows real-time readings or min/max values, while push-button controls enable three start modes: no delay, button-triggered, or delayed start. Data downloads via USB to a compatible PC running DicksonWare™ software in approximately 1 minute when memory is full. The CR123 lithium battery provides one year of typical operation and is user-replaceable in the field. Housed in a compact polycarbonate enclosure measuring 1.34" × 3.08" × 2.25", the TP425 weighs 4 oz and operates across -4°F to +158°F (-20°C to +70°C) at 0% to 95% RH non-condensing conditions. Audio/visual alarms and indicator states (solid, scrolling, flashing, blank) provide at-a-glance logging status.

Technical Specifications

Temperature Range: -4°F to +158°F (-20°C to +70°C)

Temperature Accuracy: ±0.8°F (±0.5°C) from +20°F to +120°F (-6°C to +48°C); ±1.8°F (±1.0°C) outside this range

Humidity Range: 0% to 95% RH non-condensing

Humidity Accuracy: ±2% RH at 0–60% RH; ±3% RH at 60–95% RH

Resolution: 0.1°F (0.1°C), 1% RH

Sample Interval: 1 second to 24 hours, configurable in 1-second increments

Data Storage: 32,512 total sample points (16,256 per channel)

Response Time: 10 minutes to 63% full scale (internal channel)

Display: 2.5-digit LCD, 1.2" × 0.9", TN reflective, 20-second update rate

Power Supply: CR123 lithium battery, user-replaceable; 1 year typical life

Enclosure: Polycarbonate; IP20 rated

Dimensions: 1.34" × 3.08" × 2.25" (3.4 cm × 7.8 cm × 5.7 cm)

Weight: 0.45 kg (1 lb)

Key Features

Dual-channel independent logging with min/max tracking

USB data transfer; 6-foot USB cable included

Field-user calibration via SW400 software

Three selectable start modes for experimental flexibility

Real-time LCD display with status indicators and audio/visual alarms

Compact form factor for placement in tight or space-constrained environments

Compatibility & Integration The TP425 interfaces with DicksonWare™ software (minimum version 13.6) on Microsoft Windows® 98 and later systems. Required PC specifications: 486 MHz or faster processor, 16 MB RAM, one free USB root hub, CD drive, and VGA monitor or equivalent.