- Brand: Michell Instruments
Tags: OptiCal, Humidity, Calibrator, Michell, Instruments
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
