GEO Calibration Hygro Mini-X is a portable humidity and temperature calibrator designed for professional calibration applications in laboratories and directly in the field. The compact calibration system actively generates and controls both relative humidity and temperature, making it suitable for testing and calibrating humidity probes, temperature and humidity transmitters, hygrometers and environmental monitoring sensors.

Compared with the standard Hygro Mini, the GEO Calibration Hygro Mini-X offers an extended controlled temperature range from 10 °C to 50 °C at an ambient temperature of 23 °C. The achievable humidity range depends on temperature and reaches 5 % RH to 85 % RH at 23 °C.

The calibration system provides a specified temperature accuracy of ±0.10 °C and humidity accuracy of ±1.00 % RH, based on probe accuracy. A PID controller continuously regulates the conditions inside the calibration chamber.

Its portable design, integrated lithium-ion battery, water reservoir and desiccant system make the Hygro Mini-X particularly suitable for mobile calibration applications where a conventional stationary humidity chamber would be too large or impractical.

At europascal, you receive professional solutions for humidity and temperature calibration. We can assist you in selecting the appropriate humidity generator, reference probe and accessories for your individual calibration requirements.

For regular calibration and metrological traceability of humidity and temperature measuring instruments, europascal also provides a professional Calibration Service.

Your Benefits at a Glance

• Portable humidity and temperature calibrator
• Active humidity and temperature generation
• Controlled temperature range from 10 °C to 50 °C at 23 °C ambient temperature
• Humidity range up to 5 % RH to 85 % RH at 23 °C
• Temperature accuracy ±0.10 °C
• Humidity accuracy ±1.00 % RH
• PID-controlled calibration system
• Temperature uniformity ±0.20 °C
• Humidity uniformity ±0.40 % RH at 23 °C
• Temperature stability 0.10 °C
• Humidity stability 0.15 % RH at 23 °C
• Temperature resolution 0.1 °C
• Humidity resolution 0.1 % RH
• Calculated dew point resolution 0.01 °C
• Typical temperature ramp rate 1 °C/min
• Typical humidity ramp rate 3 % RH/min
• 55 ml water reservoir
• Distilled water operation
• 360 cc indicating molecular sieve desiccant
• 11,000 mAh lithium-ion battery
• Approximately 5 hours average battery operation
• USB interface
• Suitable for laboratory and field calibration
• Compact solution for professional humidity calibration

Portable Humidity and Temperature Calibration

The GEO Calibration Hygro Mini-X combines the functionality of a humidity generator and temperature calibrator in one portable instrument.

This is particularly beneficial for calibration tasks involving combined humidity and temperature probes.

Instead of exposing the device under test to uncontrolled ambient conditions, the Hygro Mini-X generates defined combinations of temperature and relative humidity.

A suitable reference probe and the device under test can therefore be exposed to the same controlled environment.

Once the system has stabilized, the reference value and indication of the device under test can be compared.

Typical applications include:

• Calibration laboratories
• In-house calibration laboratories
• Quality assurance
• Measuring equipment monitoring
• Pharmaceutical applications
• Food production and storage
• Environmental monitoring
• HVAC systems
• Building automation
• Process industries
• Research and development
• Production environments
• Maintenance
• Mobile calibration services

Extended Temperature Range from 10 °C to 50 °C

A major advantage of the GEO Calibration Hygro Mini-X is its extended temperature range.

At an ambient temperature of 23 °C, the controlled temperature range is:

10 °C to 50 °C

This provides considerably greater flexibility than the standard Hygro Mini and allows humidity probes to be evaluated across a wider temperature range.

Temperature is a particularly important influencing quantity in relative humidity measurement. Even relatively small temperature changes can significantly affect the relative humidity value.

Controlling both temperature and humidity therefore provides an important advantage for professional humidity calibration.

Controlled Relative Humidity

The available humidity range of the GEO Calibration Hygro Mini-X depends on the selected temperature.

According to the manufacturer specifications, typical controlled ranges include:

This temperature-dependent operating range should be considered when defining calibration points.

The widest specified relative humidity range is available around 23 °C, where values from 5 % RH to 85 % RH can be generated.

Humidity Accuracy of ±1.00 % RH

The specified calibration system accuracy for relative humidity is:

±1.00 % RH

according to the manufacturer’s specification based on probe accuracy.

This makes the Hygro Mini-X suitable for professional comparison measurements and calibration applications involving many industrial humidity sensors and transmitters.

The uncertainty of an actual calibration is not determined by the generator specification alone. The reference probe, uniformity, stability, environmental conditions, device under test and calibration method must also be considered when establishing the complete measurement uncertainty budget.

Temperature Accuracy of ±0.10 °C

The specified calibration system temperature accuracy is:

±0.10 °C

according to the manufacturer specification based on probe accuracy.

This is particularly useful when calibrating combined humidity and temperature probes.

Both measured quantities can be evaluated within the same controlled environment instead of using completely separate calibration systems.

PID-Controlled Calibration System

The GEO Calibration Hygro Mini-X uses a PID controller to regulate temperature and humidity.

The controller continuously compares the selected setpoint with the actual measured condition and adjusts the system accordingly.

The specified temperature uniformity is:

±0.20 °C

The specified humidity uniformity at 23 °C is:

±0.40 % RH

Temperature stability is specified as:

0.10 °C

Humidity stability at 23 °C is specified as:

0.15 % RH

These parameters are particularly important for comparison calibration because the reference sensor and device under test need to experience sufficiently stable and uniform environmental conditions.

Fast Changes Between Calibration Points

Efficient calibration requires reasonable transition times between individual humidity and temperature setpoints.

The GEO Calibration Hygro Mini-X provides typical temperature ramp rates of approximately:

1.00 °C per minute

for both increasing and decreasing temperature.

The typical humidity ramp rate is approximately:

3.00 % RH per minute

for increasing and decreasing humidity.

Actual transition and stabilization times depend on the selected calibration points, ambient conditions and the condition of the desiccant.

This allows several calibration points to be generated sequentially without the long transition periods often associated with larger environmental chambers.

Humidification with Distilled Water

The Hygro Mini-X contains a 55 ml water reservoir.

The manufacturer specifies:

distilled water only

for operation of the humidification system.

The reservoir is designed to be spill resistant and includes a fill indicator.

Under typical conditions, the manufacturer specifies an estimated refill interval of approximately one month, although the actual interval depends strongly on instrument usage.

Correct water quality is important for reliable operation and helps prevent contamination of the humidity generation system.

Integrated Desiccant System

Reducing relative humidity requires moisture to be removed from the circulating air.

The GEO Calibration Hygro Mini-X therefore uses an indicating molecular sieve as a desiccant.

The specified desiccant volume is:

360 cc

The indicating desiccant provides a visual indication of its condition.

According to the manufacturer, replacement is required when approximately three quarters of the indicating desiccant has been used.

The actual replacement frequency depends entirely on the workload and the humidity levels generated.

Frequent operation at low relative humidity values generally places greater demands on the drying system.

Lithium-Ion Battery for Mobile Calibration

A major advantage of the GEO Calibration Hygro Mini-X is its integrated lithium-ion battery.

The specified battery capacity is:

11,000 mAh at 12 VDC

The manufacturer specifies an average operating time of approximately:

5 hours

Battery-powered operation is particularly useful for mobile calibration services and applications where a suitable mains supply is not permanently available.

The battery is specified for an average of approximately 300 cycles under typical conditions.

Designed for Field Calibration

Traditional humidity calibration chambers are generally stationary systems.

The GEO Calibration Hygro Mini-X provides an alternative approach by combining controlled humidity and temperature generation with portable construction.

This enables the calibration system to be transported to the device under test rather than requiring every sensor to be brought to a stationary laboratory.

This can be particularly beneficial for:

• Service technicians
• On-site calibration
• Production facilities
• Pharmaceutical environments
• HVAC systems
• Environmental monitoring systems
• Research facilities
• Quality assurance departments

For installed sensors that are difficult to remove, a portable humidity generator can considerably simplify the calibration procedure.

Calibration of Humidity and Temperature Probes

A typical calibration procedure involves placing the reference sensor and device under test in the controlled environment of the GEO Calibration Hygro Mini-X.

The required temperature and relative humidity setpoints are then selected.

After sufficient stabilization, the indication of the device under test is compared with the reference measurement.

The procedure can be repeated at several calibration points.

A typical humidity calibration may include measurements in the lower, middle and upper parts of the required humidity range.

Additional temperature points can be selected if the temperature dependence of the sensor needs to be investigated.

The exact calibration procedure should always be defined according to the required measurement uncertainty, sensor specification and applicable laboratory procedure.

Suitable Devices Under Test

The GEO Calibration Hygro Mini-X can be used with numerous types of humidity and temperature measuring instruments.

Typical devices under test include:

• Relative humidity sensors
• Humidity probes
• Temperature and humidity probes
• Hygrometers
• Humidity transmitters
• Temperature and humidity transmitters
• Environmental monitoring sensors
• Data logger probes
• HVAC sensors
• Building automation sensors
• Process humidity sensors
• Laboratory humidity sensors

The dimensions and design of the individual probe must be compatible with the calibration chamber and available probe ports.

Display Resolution

The Hygro Mini-X provides clear digital resolution for the main calibration parameters.

The specified display resolution is:

Temperature: 0.1 °C

Relative humidity: 0.1 % RH

The calculated dew point is displayed with a resolution of:

0.01 °C

The dew point value is calculated from the measured temperature and relative humidity conditions.

USB Communication

The GEO Calibration Hygro Mini-X provides a USB interface for connection to an external computer.

According to the manufacturer information, a USB cable and software are included.

This supports digital integration of the humidity calibrator and simplifies communication with the instrument.

For calibration laboratories, digital communication can also support more efficient measurement procedures and documentation.

Technical Highlights

The GEO Calibration Hygro Mini-X combines a wide controlled range with portable operation:

• Controlled temperature range from 10 °C to 50 °C at 23 °C ambient
• Humidity range from 5 % to 85 % RH at 23 °C
• Temperature accuracy ±0.10 °C
• Humidity accuracy ±1.00 % RH
• PID controller
• Temperature uniformity ±0.20 °C
• Humidity uniformity ±0.40 % RH at 23 °C
• Temperature stability 0.10 °C
• Humidity stability 0.15 % RH at 23 °C
• Temperature resolution 0.1 °C
• Humidity resolution 0.1 % RH
• Calculated dew point resolution 0.01 °C
• Typical temperature ramp rate 1 °C/min
• Typical humidity ramp rate 3 % RH/min
• 55 ml water reservoir
• 360 cc desiccant system
• 11,000 mAh lithium-ion battery
• Approximately 5 hours average battery operation
• USB interface

Technical Specifications

GEO Calibration Hygro Mini-X vs. Hygro Mini

The GEO Calibration Hygro Mini-X extends the capabilities of the standard Hygro Mini, particularly in terms of temperature range and mobile operating time.

The standard Hygro Mini provides a controlled temperature range from approximately 18 °C to 35 °C at 23 °C ambient temperature.

The Hygro Mini-X extends this range to:

10 °C to 50 °C at 23 °C ambient temperature

Both systems can generate up to 5 % RH to 85 % RH at 23 °C, but the Mini-X provides additional humidity specifications across its extended temperature range.

The Hygro Mini-X also uses a larger 11,000 mAh lithium-ion battery with an average operating time of approximately 5 hours.

The standard Hygro Mini uses a smaller battery and provides a shorter typical operating time.

The desiccant capacity is also significantly larger in the Mini-X, supporting demanding mobile calibration applications.

The GEO Calibration Hygro Mini-X is therefore particularly suitable when a wider controlled temperature range and extended mobile operating capability are important.

Why Choose the GEO Calibration Hygro Mini-X?

The GEO Calibration Hygro Mini-X combines controlled humidity generation, temperature control and portable operation in a single compact calibration system.

Its controlled temperature range from 10 °C to 50 °C significantly expands the available calibration conditions compared with smaller portable humidity generators.

At 23 °C, relative humidity values from 5 % RH to 85 % RH can be generated.

A specified calibration system accuracy of ±1.00 % RH and ±0.10 °C, based on probe accuracy, supports demanding comparison measurements.

The integrated water and desiccant systems allow both humidification and dehumidification, while the 11,000 mAh lithium-ion battery provides approximately five hours of typical mobile operation.

For calibration laboratories, service technicians and quality assurance departments, the Hygro Mini-X therefore provides a flexible solution for humidity and temperature calibration both in the laboratory and directly in the field.

At europascal, we can assist you in selecting the appropriate GEO Calibration humidity generator, reference probe and accessories for your individual calibration requirements.

For regular calibration and metrological traceability of humidity probes, hygrometers, temperature sensors and humidity calibration equipment, use the europascal Calibration Service.

Additional calibration and measurement solutions are available through the europascal English homepage.

Discover more GEO Calibration products and calibration solutions from europascal.

Manufacturer information about the GEO Calibration Hygro Mini-X is available from GEO Calibration.

The Hygro Mini-X technical datasheet provides detailed specifications for the calibration system.

Download Datasheet