• Utilizes EdgeTech's Optical Chilled Mirror (OCM) technology for high accuracy.
• Portable and self-sufficient humidity calibration system.
• Offers highest accuracy for Relative Humidity (RH) and Ambient Temperature (AT):
  • RH Accuracy: ±0.5%
  • RH Range: 5% to 95%
  • AT Accuracy: ±0.2°C
  • AT Range: 10°C to 50°C
• Independent control of temperature and RH.
• Automatic correction for mirror contaminants.
• Certified measurements against NIST traceable standards.
• Standard features included without extra charges.

The Model RH CAL is a microprocessor-based, programmable humidity calibration system suitable for both laboratory and field use. It provides NIST traceable humidity calibrations with high accuracy for RH and AT. The system allows independent control of temperature and humidity, making it adaptable to various calibration protocols. It employs EdgeTech’s OCM technique for traceability and feedback control, ensuring it is a standalone, portable system.

Unlike other systems, RH CAL is self-sufficient, requiring no compressed air or water connection, enhancing its portability. Features like the Automatic Balance Cycle (ABC) and integral ambient temperature probe ensure superior accuracy and fast response.

• Accuracy:
  • RH: ±0.5%
  • AT: ±0.2°C
  • Dew/Frost Point: ±0.2°C nominal
• Temperature and RH Ranges:
  • RH: 5 to 95%
  • AT: 10 to 50°C
  • Dew/Frost Point: -40 to 60°C, D2 sensor
• Slew Rate: 1.0°C (1.8°F) / second max., above 0°C
• Dew/Frost Point and Temperature Sensors: 3-wire Platinum Resistance Thermometer (PRT), 100 ohms at 0°C, nominal
• Repeatability: ±0.05°C
• Hysteresis: Negligible

The RH CAL uses a unique control scheme with volumetric proportional control valves to maintain precise RH control. It modulates 'Dry' and 'Wet' valves to quickly generate and stabilize desired humidity levels. Continuous monitoring via the integral chilled mirror allows for instant reaction to changes in humidity, maintaining control stability.

• Sample Flow Rate: 1 liter/minute (2.0 SCFH)
• Operating Temperature: Control Unit: 0 to +50°C (+32 to +122°F)
• Outputs: Analog (0-5VDC or 4-20mA) and RS232C serial port
• Sensor Materials: Chromium, glass, epoxy, anodized aluminum
• Power Requirements: 100 to 240 VAC, 50-60 Hz, 150 Watts Maximum
• Display: Multi-Line Graphical LCD Display
• Dimensions: 52.4W x 43.7D x 21.7H cm (20 5/8 W x 17 3/16 D x 8 9/16 H in)
• Enclosure: Ultra high-impact structural copolymer carrying case