Michell Instruments Opti-Cal Specifications
Reference Hygrometer
Type Optidew chilled mirror dew-point
transmitter
Humidity
Generator range 10–90% RH
Accuracy ≤±1% RH (10–70% RH)
Control element ≤±1.5% RH (70–90% RH)
Stability ±0.2% RH (20–80% RH)
Temperature
Generator range +10 to +50°C (+50 to +122°F)
(lowest T set point = 10ºC (18°F) below
ambient)
Accuracy ±0.1°C (±0.2°F)
Stability ±0.1°C (±0.2°F)
Chamber
Ramp rate from
+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
General
Probe ports up to 5 – sensor body diameters 5–25mm
(0.2 to 0.98”) accommodated by port
adapters
Chamber volume 2000 cm3 (122.1in3)
Chamber dimensions 105 x 105 x 160mm (4.13 x 4.13 x 6.3”)
(wxhxd)
Instrument dimensions 520 x 290 x 420mm (20.5 x 11.4 x 16.5”)
(wxhxd)
Set point resolution 0.1 for humidity and temperature
Displays High definition 2 lines alpha numeric
Measurement units ºC, ºCdp, % RH
g/kg, g/m3, (t-t ), a
d w
Outputs
Analog Two channels 4-20 mA or 0-20 mA
Digital RS232 (RS485 optional)
Alarm Volt free contact, 2A @ 30 V DC
Supply 85–264 V AC, 47–63 Hz, 150 VA
Weight 20kg (44lb)
Humidity and Dew-Point Instruments
OptiCal
Relative Humidity and Temperature Generator with built-in Chilled Mirror
Reference
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
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.
Highlights
• 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 calibrator enables on-site calibrations
Issue No: OptiCal_97161_V3.1_US_0718
OptiCal
Technical Specifications
Logging and profiling software
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specification changes without notice. Please contact us for latest version.
www.michell.com
Humidity and Dew-Point Instruments
OPTICAL - Precision humidity calibration system with temperature control. Includes 5 port door and integrated chilled mirror reference
hygrometer with 3 point UKAS RH calibration
Feature
Item
Description
Base Model
OPTICAL
Base unit
Accessories and Spare Parts
0.25kg (0.55lbs) desiccant (orange) A000171
ø18.5mm (0.73") Blind stop A000200
Drying module A000240
Water bottle A000242
PRT sensor A000243
Door kit with 5 ports. 5 adapters to be specified A000263
Door kit with 5 ports and 25 adapters (5 x ø19mm (0.75"), 4
x ø12mm (0.47"), ø13.5mm (0.53"), ø15mm (0.59"), ø18.5mm
(0.73"), ø24mm (0.94") - and blind stops. Adapter tool included)
Tool for changing the port adapters A000265
Door with clear window - no ports A000266
Door without ports A000268
Door kit for use with MI Optidew. (Optidew dew-point sensor
port adapter, PRT port adapter and 4 x ø19mm (0.75") adapters.
Adapter tool included)
Polymer port adpt ø18.5mm (0.73") to ø3mm (0.19") (for Optidew
probe)
M30x1 Molded polymer port adpt & blind stop (to be modified by
customer)
Polymer port adpt ø client specific & blind stop A000290X
Polymer port adpt for ø12mm (0.47") probe, blind stop (M30x1) A000291
Polymer port adpt for ø13.5mm (0.53") probe, blind stop (M30x1) A000292
Polymer port adpt for ø14mm (0.55") probe, blind stop (M30x1) A000293
Polymer port adpt for ø15mm (0.59") probe, blind stop (M30x1) A000294
Polymer port adpt for ø18.5mm (0.73") probe, blind stop (M30x1) A000295
Polymer port adpt for ø19mm (0.75") probe, blind stop (M30x1) A000296
Polymer port adpt for ø24mm (0.95") probe, blind stop (M30x1) A000297
Polymer port adpt for ø25mm (0.98") probe, blind stop (M30x1) A000298
Control sensor HT961T00
Transport Case for OptiCal and S904 OCAL-TC
A000264
A000269
A000273
A000290
Order Codes
Dimensions
110mm
(4.33")
104mm
(4.09")
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© Michell Instruments 2009-2018
Michell Instruments Ltd, Rotronic Instruments Corp. 135 Engineers Road, Suite 150,
Hauppauge NY 11788. Tel: 631 427 3898, Email: us.info@michell.com
www.michell.com/us
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