OptiCal Humidity Calibrator

The OptiCal is a bench-top, fully self-contained humidity/ temperature calibrator. The system comprises a humidity and temperature controlled chamber that can house up to five or more humidity sensors, depending on their physical dimensions. The humidity and temperature within the chamber are closed-loop controlled and continuously monitored by a precision chilled mirror reference hygrometer.

The OptiCal works by time proportioning the flows of dry and saturated air according to the pre-selected relative humidity value. The chamber temperature is controlled by a four-zone Peltier heat pump arrangement for maximum stability and minimum temperature gradient. The saturator assembly can be filled easily with the distilled water reservoir at the front of the unit and the easily accessible desiccator can be re-charged by heating when required. No other maintenance is necessary. The only external service required is a single phase power supply.

Product Features

• Precision relative humidity and temperature calibrator
• Generate 10 to 90% RH over +10 to +50°C (+50 to +122°F) temperature
• Integral chilled mirror reference hygrometer
• UKAS accredited calibration, as standard
• Humidity and temperature profile generation for unattended verification of sensors
• Transportable to allow on-site calibrations

Technical Specifications

Humidity
Generated Range	10 - 90% RH
Control Element Accuracy	≤ ±1% RH (10-70% RH) ≤ ±1.5% RH (70-90% RH)
Stability	±0.2% RH (20-80% RH)
Temperature
Generated Range	+10 to +50°C (+50 to +122°F)
Accuracy	±0.1°C (±0.18°F)
Accuracy	±0.1°C (±0.18°F)
Chamber
Ramp Rate	+20 to +40°C (+68 to +104°F): 1.5°C / minute (2.7°F / minute) +40 to +20°C (+104 to +68°F): 0.7°C / minute (1.2°F / minute)
Control Element	Removable relative humidity sensor
Reference
Accuracy	Dew Point: ±0.2°C (±0.36°F) Temperature: ±0.1°C (±0.18°F)
Measurement Units	Dew Point: (°C/°F), % RH Temperature: (°C/°F), gm-3, gkg-1, water activity (aW)
Outputs	Analog: 4-20 mA or 0-20 mA over user-settable output Accuracy: ±0.2°C (±3.6°F) Digital: 500 Ω maximum load resistance Alarm: RS232 @ 9600 baud rate Volt free contact, 30 V, 100 mA maximum
General
Probe Ports	Up to 5 - sensor body diameters 5 to 25mm (0.2 to 0.98") accommodated by port adapters
Chamber Volume	2000cm3 (112.1in3)
Chamber Dimensions	105 x 105 x 160mm (4.13 x 4.13 x 6.3") (h x w x d)
Instrument Dimensions	290 x 520 x 420mm (11.4 x 20.5 x 16.5") (h x w x d)
Set-point Resolution	0.1 for humidity and temperature
Displays	2 line Vacuum Fluorescent Display
Supply	85 to 264 V AC, 47/63 Hz, 150 V A
Weight	20kg (44lbs)

Applications