Rotronic HygroGen2-XL calibration chamber

Rotronic HygroGen2-XL calibration chamber

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Products & Services | Rotronic AG


Rotronic has supplemented its ground breaking portable HG2-S temperature and humidity generator, with the larger HG2-XL model that offers ten times the chamber capacity and more connections to enable multiple probes from all manufacturers to be calibrated both in the laboratory and on-site.

Calibrations can be performed across the working range of devices; with only a few minutes to reach stable set-point equilibrium work is completed quickly compared with other methods.

The HG2-XL offers the same rock solid stability, minimal thermal gradients and rapid time for set-point changes that have made HygroGen HG2-S a favorite solution throughout the pharmaceutical industry as the leading calibration instrument in its class and embraced by ISO17025 humidity calibration laboratories around the world.

With its ability to perform multipoint calibrations on multiple sensors with fast turnaround time, the HygroGen2-XL generator saves time and money providing rapid return on investment (ROI).


The HygroGen2 is a generator of controlled relative humidity and temperature environments, primarily for use in calibrating humidity instrumentation, but is also well suited to the calibration of temperature instrumentation, particularly those used for the measurement of temperature in air.

Since its launch, the Rotronic HygroGen2 has defined the standard for portable humidity and temperature calibration systems. Hundreds of users worldwide have confirmed this tool for the rapid generation of stable temperature and humidity conditions can save significant amounts of time in performing calibrations of all types of humidity instruments from all manufacturers.

The HygroGen2-XL generator is designed for calibration laboratories, production areas throughout industry and research facilities where fast stability time is required, along with the capacity to enable a high volume of probes and devices from all manufacturers to be calibrated at multiple points with fast return to their installation points, minimising production downtime.

It is a completely self-contained unit requiring no external resources except mains power. The robust design allows it to be set up quickly and simply at any chosen calibration site, allowing for complete system qualification.

The HygroGen2 uses a mixed flow method for generating the %rh required by the user. A desiccant cell provides a source of low humidity and a piezoelectric humidifier generates high humidity. A Peltier element is used for heating and cooling the chamber. Measurement and control is provided by a combination of a ROTRONIC HygroClip probe, an embedded Platinum Resistance Thermometer (PRT) and a multi-loop controller. Set-points are entered using the touch-screen front panel display.


The HygroGen HG2-XL is built around a 20-liter volume working chamber that provides three shelves and 17 liters working capacity. Nine USB ports are provided (seven front, two rear) allowing multiple probes or sensors to be connected simultaneously. Connections are made via ports in the chamber door.

The HG2-XL takes less than 15 minutes to generate stable equilibrium humidity between 5 and 95% RH to an accuracy of 0.1 %RH or temperatures from 23 to 50°C, with 0.01 °C stability.

The system is controlled by integrated Rotronic HW4 software that is FDA 21 CFR part 11 compliant.

The system can be calibrated manually or automatically, using the optional AutoCal automated calibration solution that is favored by ISO 17025 calibration laboratories worldwide. This allows automated calibration of multiple HC2 probes connected via AC3001 USB adaptor with options to automatically adjust one temperature and 10 humidity points and creates a PDF calibration certificate for each probe under test.

The system can also be fitted with Remote API logging and control, using third party software, to allow granular command line control and logging of the HygroGen2 via a series of commands over TCP/IP. This allows users to integrate the HygroGen2 into their own or third party systems, e.g. Beamix and/or write software scripts to automate the calibration process.

External MBW/RHS Reference Integration (formerly “AutoCal+”) further extends the utility of the generator, with the ability to integrate MBW chilled mirror hygrometers as the AutoCal calibration reference or within the Remote API.

Optional Range Extensions extend HG2-XL’s lower working temperature range to -5 °C and lower humidity range to 2% RH. Users can also specify Remote Screen Sharing that allows a larger screen interface to be shared with another device cross platform for access via Windows, Mac OSX, iOS and Android.

The supplied door has eight 30mm ports with a 19-port version also available.

HygroGen2-XL Specification

Control Relative Humidity Temperature
Sensor HygroClip2-S, capacitive RH sensor Pt100 temperature sensor
Control type Embedded multiple PID controller, touch screen graphical user interface
Range 5….95%rh 0…60°C
(with Range Extension) 2…99%rh -5…60°C
Stability at equilibrium <0.1%rh <0.01°C
Chamber temperature gradients <0.05°C (15-50 °C), <0.1°C (5-60°C), <0.15°C (0-5°C)
Generation method Mixed flow with desiccant dryer cell and piezoelectric humidifier Peltier thermoelectric element with radial chamber mixing fan


Response time 15 minutes (35 to 80% change) 15 minutes (20 to 30°C change)
Control probe specification ±0.8%rh(23°C ±5) ±2%rh (0-60°C) ±0.1K (23°C ±5) ±0.3K (0-60°C)
Typical calibration uncertainty ±1.5%rh (k=2) at 23°C ±0.15°C (k=2) 15-50°C


Standard Features
Water level Low and high alarm, bar graph status indication
Water quality UV sterilisation, auto time cycling
Desiccant condition Condition monitored during control operation
USB ports 7 front, 2 rear
Reference connection Temperature controlled outlet and inlet, 6mm fittings
Programmer function 20 user program memory, up to 200 set-point changes per program


Mechanical & Electrical
Chamber volume 20 litres, effective working volume 17 litres
Power 110-240VAC 50/60Hz, 3A (240VAC) 6A (110VAC)
Enclosure Powder coated aluminium, and steel, IP20, 80x62x41cm (Max)
Operating Conditions 10-35°C <2000m Altitude or less.
Weight 37 kg
CE Safety: EN 61010-1:2001 EMC: EN 61326-1:2006EN 61326-1:2006 &EN 61000-6-1:2007



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Two liter HG2-S placed atop 20-liter HygroGen HG2-XL

Two liter HG2-S placed atop 20-liter HygroGen HG2-XL

Supplier Information
Supplier: Rotronic AG
Address: Grindelstrasse 6, CH-8303 Bassersdorf, Switzerland
Tel: +41 44 838 1144
Fax: +41 44 838 1487

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