HG10 Humidity Calibrator

The Michell HG10 Humidity Calibration System is a highly flexible computer-controlled automatic calibration system for humidity sensors. The HG10 is capable of repeatable generation of temperature and relative humidity set points over the range 1 to 95% RH
(-50 to +50°Cdp) at temperatures of +20 to +50°C with excellent stability. The supplied chilled mirror reference instrument provides traceability directly to national standards, and makes the system suitable for use in high-level calibration laboratories.

The supplied PC software allows the creation of automatic calibration programs, for evaluating the performance of humidity sensors over a range of operating conditions. The measured values from the chilled mirror reference are used in a closed control loop to enable repeatable set point generation, time and time again.

Product Features

  • Automatic calibration system with reference hygrometer
  • Wide range of humidity generation 1 to 95% RH, -50 to +50°Cdp
  • High accuracy ±0.1°C fundamental reference
  • User-configurable temperature and humidity profiling allows calibration cycles to be run without constant supervision
  • Very fast changes between generated relative humidity points

Technical Specifications

Enclosure 19” Rack System, H= 2.1m
Power Supply 100 to 115 V or 220 to 240 V 50/60Hz
Pressure Swing Dryer
Gas Output Flow: 7 Nl/min
Pressure: 0.68 barg
Moisture Content: <1ppmV (<-75°Cdp)
Required Gas Supply Flow: 10 Nl/min
Pressure: 5 to 7 barg
Moisture Content: Oil and liquid water free
Type Twin column desiccant, pressure swing
Desiccant 4 Ångström Molecular sieve bead (4-8 mesh)
Timer Motorized cam
Operating Temperature +5 to +35°C
Generation Range Humidity: 1 to 95% RH (-50 to +50°Cdp)
Temperature: Dependant on temperature chamber
Generated Gas Output Air 2 Nl/min @ 0.5 barg via heat traced line
Dual Stage MFC Mixing Dual mass flow controllers
Power Consumption 550 V A maximum
Dual Stage MFC Mixing Dual mass flow controllers
Operating Temperature +5 to +40°C; 10 to 90% RH
Enclosure 19" Rack System, H= 2.1m
Control System Closed loop feedback
Dew-Point Sensor Performance
Accuracy ±0.1°C (±0.18°F)
Reproducibility ±0.05°C (±0.09°F)
Measurement technology Chilled Mirror
Sensor 2-Stage High Temp PEEKClimatic head
Dew-point range –40°Cdp@ sensor temp of +20°C +90°Cdp @ sensor temp of +90°C –40°Cdp @ sensor temp of +20°C +120°Cdp @ sensor temp of +120°C–10°Cdp @ sensor temp of +20°C +120°Cdp @ sensor temp of +120°C
Temperature range –40 to +90°C –40 to +120°C–40 to +120°C
%RH range <0.5 to 100% <0.5 to 100%10 to 100%
Min measured dew point @ 20°C –40°C –40°C–10°C
Mirror material options Gold plated copper (standard), gold stud, Platinum stud**
Sensor body material options Acetal (standard), high temperature PEEK, Anodized aluminum**
Response speed 1°C/sec (1.8°F/sec) plus settling time
Operating pressure 20 barg (290 psig) standard pressure High version: 250 barg (3625 psig) max
Remote PRT
Temperature measurement 4 wire Pt100, 1/10 DIN class B
Accuracy ±0.1°C (±0.18°F)
Cable length 2m (6.6ft) (250m (820ft) max)
Optional Remote Pressure Sensor
Measurement range 0 to 25 bara (0 to 377 psia)
Accuracy 0.25% Full Scale
Measurement units psia, bara, KPa or MPag
Pressure transducer thread 1/8” NPT
Resolution User-selectable to 0.001 dependant on parameter
Measurement units °C and °F for dew point and temperature %RH, g/m3, g/kg, ppm , %Vol, ppm (SF ), for calculated V W 6 humidities
Outputs Analog Digital:
3 channels, user selectable 4–20 mA, 0–20 mA or 0–1 V Modbus RTU over USB and optionally Modbus RTU over RS232 or RS485, or Modbus TCP over ethernet.


Two volt free changeover contacts, one process alarm, one fault alarm; 1 A @ 30 V DC
HMI 5.7” LCD with touchscreen
Data logging SD Card (512Mb supplied) and USB interface SD Card (FAT-16) – 2Gb max. that allows 24 million logs or 560 days, logging at 2 second intervals
Environmental conditions –20 to +50°C (–4 to +122°F)
Power supply 85 to 264 V AC, 47/63 Hz
Power consumption 100 V A
Mechanical specifications
Dimensions (instrument) 190 x 255 x 215mm (7.5 x 10.0 x 8.4”) h x w x d
Dimensions (sensor) ø45 x 128mm with M36 x 1.5-6g mounting thread
Weight 4.2kg (9.26lbs)
Cable lengths 3, 5 or 10m (9.8, 16.4 or 32.8ft)
Storage temperature –40 to +60°C (–40 to +140°F)
Detection system Single optics detection system with auto adjustment
Calibration 4-point traceable in-house calibration as standard; UKAS accredited calibrations optional – please consult Michell Instruments
**Recommended for special applications only. Consult Michell Instruments before ordering.