Model X3 Chilled Mirror Hygrometer Sensor

The Edgetech Instruments Model X3 chilled mirror sensor is specifically designed to measure the Dew/Frost point in demanding process and laboratory applications. It is available in multiple configurations to accurately measure very low dew/frost points in aggressive background gases. The Model X3 sensor’s minimized sample cavity results in rapid dry-down times, fast response and quick detection of upset process conditions. …


  • Chemically resistant sensor housing and mirror eliminate sensor failures when measuring dew/frost point in aggressive background gases
  • Chamber design and high efficiency heat exchanger result in the ability to measure very low frost points
  • Hinged cover plate allows easy access to the mirror for cleaning and inspection
  • Reduced cavity sample chamber speeds sample sweeping resulting in rapid dry-down after exposure to high moisture levels
  • Rugged, industrial electrical connectors and easy access slim line signal harness simplify installation and maintenance
  • Best in class range to -95°C frost point

DewMaster Chilled Mirror Hygrometer

Edgetech Instruments field-proven chilled mirror technology.


  • A robust hygrometer for laboratory and industrial applications with field proven reliability and precision
  • Drift free primary method chilled mirror sensors have wide measurement ranges and do not require periodic recalibration
  • ISO/IEC 17025 accredited NIST traceable certification
  • Best in class air cooled temperature depression simplifies operation
  • Automatic Balance Control corrects for contaminants to maintain accuracy
  • Multiple sensor configurations available to fit various applications
  • Desk top, rack mount and NEMA 4X enclosure options available
RH-CAL Portable Humidity Calibrator Application Note

RH CAL Portable Relative Humidity Calibrator

The RH CAL is a programmable humidity calibration system that is at home in the metrology lab or in the field, performing on-site, NIST traceable humidity calibrations. The system provides very high accuracy for both relative humidity and temperature. Unlike other calibration systems, the RH CAL does not need compressed air or a water connection to operate, which allows the …


  • Based on Edgetech Instruments field proven chilled mirror sensor technology
  • A completely self-sufficient and portable humidity calibration system
  • Temperature and relative humidity controlled independently for custom humidity generation
  • High accuracy relative humidity and temperature control
  • Automatic correction for sensor mirror contaminants
  • Certified against NIST traceable standards in an ISO/IEC 17025 accredited laboratory

DewTech 390 Low Dewpoint Hygrometer

The Edgetech Instruments DewTech 390 is a precision dew/frost point hygrometer that measures extremely low frost points or trace moisture in a variety of background gases. Based on the primary method chilled mirror sensor technique, it is delivered with a NIST traceable calibration certificate and is certified in an ISO/IEC 17025 accredited calibration laboratory. At the core of the DewTech …


  • A precision laboratory grade hygrometer system that measures an extremely wide range of dew/frost points in gases from as low as –90°C frost point to as high as +20°C dew point
  • Based in the primary method chilled mirror technique with all the attributes, features and certifications needed for laboratory use at an affordable price
  • Ideal for metrology labs, scientific research and process measurements or any application where high precision measurement of dew/frost point over a wide range with fast response and high stability are required
  • For peak efficiency the sensor’s performance is maximized by an integral cryo-cooling system
  • The DewTech 390 is supported in the USA in a modern, ISO 9001 registered facility with ISO/IEC 17025 accredited calibration laboratory and is delivered with a UKAS traceability certificate.
PDM75-X3 Portable

PDM75-X3 Portable, Industrial Duty Hygrometer

The Model PDM75-X3 is a field portable dewpoint hygrometer that integrates the accuracy and reliability of the Edgetech Instruments chilled mirror sensor with the convenience and ruggedness required for field use. It features drift-free accuracy, NIST traceability, low maintenance, high durability and ease of use in a portable package. The Model PDM75-X3 has all the standard features of the Edgetech …


  • Based on the Edgetech Instruments DewMaster Hygrometer
  • Chemically resistant, primary method dew/frost point sensor
  • Drift free and certified against NIST traceable standards
  • Best in class air cooled temperature depression
  • Wide measurement ranges from -70°C to +70°C dew/frost point temperature
  • Locally or remotely mounted sensor options
  • Automatic Balance Control for optics contaminants correction
  • Rugged, high impact portable case
  • Multiple interfaces
  • Sampling options for positive or negative pressure
Sentry Compressed Air Monitoring and Alarm System Data Sheet

SENTRY Compressed Air Monitor and Alarm

The Edgetech Instruments SENTRY turn-key measurement and alarm system features a smart multi-sense probe that continuously monitors the dew/frost point and pressure of compressed air systems to detect compressor or dryer failures and system pressure leaks. The SENTRY features a strobe lamp and pulsing horn plus an alarm relay contact that activate when a programmable, low pressure or high dew/frost …


  • Detects upset conditions in compressed air systems
  • Constantly monitors pressure and dew/frost point temperature
  • Strobe lamp and pulsing audible alarms for low pressure or high dew/frost point alert
  • Displays dew/frost point and pressure on panel meter
  • NIST traceable calibration certificate
  • Field replaceable Smart Sensor Tip
  • Alarm relay and 4 to 20 mA outputs
  • Complete system, ready for installation

HP125 Series Multi-Sense Humidity Probe

The HP125 Multi-Sense Humidity Probe is a cost effective, easy to use solution to many industrial and laboratory measurement and control applications. The HP125 probe exploits the latest advancements in polymer humidity sensing technology and compact electronic circuitry. It is designed to continuously measure up to 4 measurement parameters using a single intelligent sensor tip including RH%, calculated Dewpoint, Temperature …


  • Single, cost-effective probe continuously measures up to 4 parameters including relative humidity, dewpoint, temperature and pressure
  • The sensor can be replaced in seconds and automatically synchronizes with the HP125 probe
  • Can be used stand-alone or in combination with the HP125-DCM or with the SENTRY series of compressed gas alarm modules
  • No need to send the probe for calibration service off-site
  • Each new sensor comes with a NIST traceable calibration certificate
  • For industrial and laboratory measurement and control applications

1500 Portable Dewpoint Monitor

The Model 1500 is a self-contained, battery powered, portable, multi-function hygrometer that accurately and reliably measures the moisture content in gases, with the battery life and ruggedness required for field use. The Model 1500 is a drift-free, low maintenance hygrometer featuring high durability, NIST traceable certification and ease of use. Its primary method chilled mirror sensor provides precision dew/frost point …


  • Primary method chilled mirror sensor provides high accuracy dew/frost point measurement
  • Temperature measurement option for live relative humidity measurement
  • Pressure measurement option for live parts per million by volume measurement
  • Automatic Balance Control mode provides automatic correction for optics contaminants
  • Current or voltage outputs, RS-232 optional
  • User programmable alarm functions
  • Internal vacuum pump to pull sample

ELH Series – Precision Humidity Chambers

The ELH Series of precision humidity chambers has NIST traceable accuracies in humidity, temperature and dewpoint. The ELH Series incorporates programmable controllers for constant, precision parameter control and uniformity plus integrated DewMaster chilled mirror hygrometers for accurate temperature and humidity measurements. These highly accurate temperature and humidity control chambers are very similar in performance to two-pressure method devices but they …


  • A group of precision calibration chambers incorporating programmable controllers plus primary method DewMaster chilled mirror hygrometers
  • Highly accurate temperature and humidity control similar in performance to two-pressure method devices but at a significantly lower price
  • Delivered with multi-point, NIST traceable, ISO/IEC 17025 accredited certification
  • Various sized bench mount calibration chambers having 304 stainless steel interiors are available

CAM Compressed Air Module

The CAM (Compressed Air Module) is a sampling chamber for use with Edgetech Instruments humidity and dewpoint probes. It has a sample inlet ball valve for connection to a pressurized compressed air or gas takeoff point, providing an easy way to connect a probe or alarm module to a gas supply. The ball valve allows isolation of the probe from …


  • Sample chamber allows safe isolation and servicing of sensor probe at pressurized sample takeoff point
  • For installation and use with HP125 and Sentry humidity probes
  • Provides ball valve to isolate probe from process pressure and bleeder valve to allow flow of sample gas past the probe sensor
  • May be used for pressure dewpoint or atmospheric dewpoint measurements
  • Available in brass or stainless steel construction