DewTech 390 Low Dew Point Hygrometer
Laboratory-Grade Hygrometer with Chilled Mirror Accuracy to –90°C
Starting at: $42,000
The Edgetech Instruments DewTech 390 is a high-precision, laboratory-grade hygrometer system engineered for demanding low dew point measurement applications. Designed for use in metrology labs, research settings, and high-performance industrial environments, it leverages a primary method, three-stage Peltier-cooled chilled mirror sensor to deliver highly accurate, direct dew/frost point readings from –90°C to +20°C.
Unlike many high-end systems in its class, the DewTech 390 delivers exceptional performance without the high price tag—making it one of the best values on the market for traceable and repeatable humidity measurement.
Key Features
| Feature | Description |
| Measurement Method | Primary method, three-stage Peltier-cooled chilled mirror with cryogenic refrigeration |
| Measurement Range | Dew/frost point from -90°C to +20°C (-130°F to +68°F) |
| Accuracy | $0.1°C dew/frost point |
| Sensor Performance | Fast response, high stability with negligible hysteresis and $0.05°C repeatability |
| Automatic Balance Control | Startup rebalancing, programmable intervals for unattended operation |
| Outputs | Analog: 0-5 VDC, 0-10 VDC, 0-20 mA, 4-20 mA; Serial: RS232 |
| Display | Backlit, scrolling 8-line LCD for dew/frost point, RH, temp, ppmv, pressure |
| Inputs (Optional) | Pressure or temperature sensors for RH and ppmy calculations |
| Sample Flow Rate | 0.5 to 5.0 SCH (0.25 to 2.4 L/min) |
| Sample Pressure | O to 75 psia (0 to 5 bar) |
| Power Requirements | 110-230 VAC, 50/60 Hz |
| Refrigerant | Integral cryo-cooling system with R-404A |
| Enclosure | Lab-grade desktop instrument |
Ultra-Low Dew Point Capability Measures dew/frost points as low as –90°C with ±0.1°C accuracy using chilled mirror technology. No Recalibration Required Long-term measurement stability eliminates frequent recalibration, reducing maintenance costs. Fast, Repeatable, Reliable Responds quickly to changes in humidity with ±0.05°C repeatability and negligible hysteresis. Fully Scalable Output Multiple analog and digital outputs available for integration into lab systems and data logging setups. Display & Programmability Multi-line graphic LCD and front-panel or remote programming for full system visibility and control.
Metrology & Calibration Labs
- Precision reference for RH, dew point, and frost point standards
- Supports ISO/IEC 17025:2017 traceability requirements
Scientific & Industrial Research
- Pharmaceutical quality control
- Medical and specialty gas systems
- Plastics manufacturing and extrusion
- Power generation and furnace gas monitoring
Semiconductor & Electronics
- Cleanroom process gas verification
- Low humidity chamber calibration
- Trace moisture analysis in fabrication environments
Education & Government
- University lab instrumentation
- Government testing and certification facilities
Q: What’s the dew point measurement range of the DewTech 390?
A: It measures dew or frost point from –90°C to +20°C, ideal for both trace humidity and moderate dew point environments.
Q: Does the DewTech 390 require regular recalibration?
A: No. Thanks to its primary method chilled mirror sensor, it provides long-term accuracy without the need for frequent recalibration.
Q: What gases can the DewTech 390 measure?
A: The system is designed for use with a wide range of clean, non-reactive gases typically used in laboratory and industrial applications. For compatibility with specific gases, please contact Edgetech Instruments.
Q: How is output data delivered?
A: The system includes analog (VDC/mA) and digital (RS232) outputs, all user-scalable and suitable for remote monitoring and control.
Configure Your System
Need to tailor your DewTech 390 for a specific lab or process environment? Edgetech Instruments can help with:
- Pressure transducer inputs for ppmv calculations
- Custom alarm settings
- Optional temperature inputs for RH calculations
- RS232 integration for printer or data systems
Call 978‑310‑7760 or request a quote to configure your DewTech 390 hygrometer.
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