Overview
The Dickson TH8P3 is an 8-inch (203 mm) circular chart recorder designed for continuous environmental monitoring of temperature and relative humidity. This portable device automatically records air temperature (-20-120°F) and humidity 24-hours/day, seven days per week, providing a permanent record. The TH8P3 features field-replaceable sensor technology with both audio/visual alarms and large digital display of current or min/max conditions. Ideal for pharmaceutical, laboratory, food storage, and clean room environments requiring environmental compliance documentation.
Key Features
- Remote temperature/humidity probe with 10-foot cord provides flexibility for tight locations, clean rooms and chambers
- Field-replaceable sensor design simplifies maintenance and calibration
- Selectable temperature range, humidity or dew point scale, and chart rotation periods (24-hour, 7-day, or 31-day) with lock-out DIP switch to prevent inadvertent changes
- Digital display with high/low alarms and SPST 24 V, 500 mA relay capability for process control
- Wall-mountable with rear panel keyhole slots for secure installation
- Audio/visual alarm type on high/low limits with CE approval
Technical Specifications
- Chart Size: 8 inches (203 mm)
- Temperature Range: -20°F to 120°F (-20°C to 50°C), selectable ranges
- Humidity Range: 0 to 95% RH; Dew Point: 32°F to 122°F
- Temperature Accuracy: ±1.8°F
- Humidity Accuracy: ±2% RH from 0 to 60%; ±3% RH from 60 to 95%
- Dew Point Accuracy: ±3.6°F from 30 to 95% RH (±2°C calculated)
- Display Type: LCD display (Height: 1.375″, Width: 2.0″, Resolution: 0.1)
- Chart Rotation Speeds: 24-hour, 7-day, or 31-day
- Channels: CH1: Temperature, CH2: Humidity
- Power: 120V AC with 9V battery backup
- Battery Backup: Four AA batteries; up to 3 days backup power
- Alarm Type: Audio/visual on high/low limits
- Operating Environment: 32°F to 120°F (0°C to 50°C); 0-95% RH non-condensing
- Enclosure: Rugged black ABS case with polycarbonate door and aluminum dial
- Dimensions: 3.1″ × 9.2″ × 9.2″
- Sensor Type: Field replaceable
- Calibration Options: N100, N300, N400
- Certifications: CE
- Included Accessories: AC adapter, red and blue pens, four AA batteries, quick start guide
- Country of Origin: Made in the USA
Typical Applications
The Dickson TH8P3 is commonly deployed in pharmaceutical storage facilities, cold chain logistics, laboratory environments, food storage and production, HVAC monitoring, museum and archive storage, and medical facilities requiring temperature and humidity compliance records. The 8-inch chart provides high-resolution data suitable for FDA 21 CFR Part 11 and GxP compliance documentation.
Compatibility & Replacements
Compatible With
- Standard Dickson 8-inch circular chart paper (24-hour, 7-day, 31-day)
- Dickson remote probe model 80001-53 (10-foot cable)
- Dickson replacement chart pens and accessories
- AC/DC power systems with 120 VAC input
- Process control systems via SPST relay output (24 VDC, 500 mA)
Replaces / Drop-In Replacement For
The TH8P3 is a direct continuation of Dickson’s 8-inch temperature/humidity recorder line. Earlier compatible models include TH8P0 and TH8P2 (without alarms). Verify specific model compatibility with Dickson technical support before ordering.
Works With
- Dickson environmental monitoring software and data management systems
- Dickson calibration services (N100, N300, N400 certification options)
- Standard chart record retention and archival systems
- Facility compliance documentation and regulatory reporting workflows
