GEO Model 1500 SP Humidity Generator

The original compact humidity generator from GEO. Lightweight, accurate, and efficient.


Benchtop Humidity Generator operates through use of a multifunction CPU in conjunction with other peripheral cards to perform calculation and control functions. The embedded computer control system allows the MODEL 1500 to generate known humidity levels unattended, freeing the operating technician from the task of system monitoring and adjustment.

A computer may be connected via the USB interface allowing remote setpoint control and continuous data feed.

Humidity and temperature setpoint values are input by the operator from the front panel controller or via our DFB Desktop Software while visual indications of system status are displayed in real time.

Key Specifications

  • Range/RH
    • 10 – 95% RH
  • Range/Temp
    • 10°C – 55°C 
  • Uncertainty/RH
    • ± 1.0% RH
  • Uncertainty/Temp
    • ± 0.2°C
  • Uniformity/RH
    • ±.3% @ 10%-50%
    • ±.4% @ 50%-90%
    • ±.5% @ 90%-95%
  • Uniformity/Temp
    • ±.2°C @ 50% RH
  • Stability/RH
    • ±0.3% RH
  • Stability/Temp
    • ±0.2°C

Full Specifications

Accuracies Temperature ± 0.2°C or better 
  Humidity 10-80%RH ± 1.0% RH or better
80-95%RH ± 1.25%RH or better
Controlled Range Temperature 10-55°C
  Humidity @23°C 10% to 95% RH
  Humidity @30°C 10% to 90% RH
  Humidity @35°C 10% to 85% RH
  Humidity @40°C 10% to 80% RH
  Humidity @50°C 10% to 70% RH
Stability Temperature ±0.2°C
  Humidity ±0.3%RH or better
Uniformity Temperature ±0.2°C @ 50%RH
  Humidity ±0.3%RH @ 10% to 50%RH
±0.4%RH @ 50% to 90%RH
±0.5%RH @ 90% to 95%RH
Temperature Change Rate Cooling 1.5°C / Minute (Typical)
  Heating 5°C / Minute (Typical)
Resolution Temperature 0.1°C
  Humidity 0.1%RH
Dew Point Range   -25°C to 45°C
Calibration System Accuracy RH and Temp ±0.5%RH and ±0.1°C
Chamber Probe Temp Compensated Temperature -40°C to 60°C 
  Humidity 0% to 100%
System Performance Verification   2-pressure method/reference compare
Calibration Certification   Traceable to NIST
Interface with Host Computer   USB (USB to USB cable included)
Display/Keyboard Feature   Customized PID Controller, Front Panel
Interface and LCD display
Software/Drivers   User friendly software included, free of charge. Upgrades include database management, and customer probe history logs for future reference.
Power Requirements   Universal 110/220VAC, 50/60 Hz
Weight Meteric 8.4 kg
10.2 kg (shipping)
  Imperial 18.5 lbs
22.5 lbs (shipping)
Outside Dimensions Metric 37 cm x 46 cm x 16 cm
(D) x (W) x (H)
  Imperial 14.5 in x 18 in x 6 in
(D) x (W) x (H)
Dew Point Range   -25°C to 45°C
Internal Chamber Dimensions   190mm (depth) x 195mm (width) x 75mm (height)
Standard Calibration Doors   Port sizes 12.5mm, 19mm and 25mm
Custom Calibration Doors Available   Port sizes from 6mm to 32mm
Power Supply   12V DC @ 1A (Power Supply for Calibrating Probes)

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