Chilled Mirror Instruments
Optidew
Chilled Mirror Hygrometer
The Optidew is a fast-responding chilled mirror hygrometer, equally at home in both industrial
humidity control and precision laboratory applications. It is available in bench top and wall mount
confi gurations, and features an intuitive touch screen interface for easy local operation. Using the
latest developments in chilled mirror technology, it has a response speed comparable to polymer
relative humidity sensors, combined with the reliability of drift-free measurements common to all
chilled mirror instruments.
Highlights
• New chilled mirror hybrid sensor gives fast
dynamic response to changes in humidity
• Accurate to ±0.15°C dew point, ±0.1°C
temperature
• Wide measurement range from -40 to +120°C
dew point
• Choice of communication methods, including
Modbus TCP over Ethernet communication for
easy networking
• Optional pressure transmitter for accurate
calculation of ppm
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& g/kg
V
Applications
• Reference humidity instrument for climatic and
environmental chambers
• Inlet air measurement for engine testing
• HVAC testing
• Environmental monitoring in clean rooms
• Coating process monitoring – for confectionary
and pharmaceuticals
• Control of humidity for metallurgical processes
Chilled Mirror Instruments
Optidew
Chilled Mirror Hygrometer
The Optidew series is both robust and adaptable, designed
for dependable performance, whether it’s in a harsh industrial
environment or in a laboratory.
New design of chilled mirror sensor: fast
response speed with drift-free reliability
The Optidew uses a new design of cooled mirror sensor which
gives a fast response speed coupled with the accuracy and
reliability of the fundamental chilled mirror technique (see
opposite page).
Measuring in climatic chambers, the Optidew is able to
directly track changes in temperature and humidity without
experiencing time-consuming loss of control like traditional
chilled mirrors.
Touch-screen HMI for easy operation
Both the wall mounted and bench top models are available
with a 5.7” colour touch screen display to make local
operation and interrogation quick and simple to carry out.
Three housing confi gurations
Optidew 401:
A bench top instrument, the
Optidew 401 has a simple,
intuitive touch-screen HMI
which for easy confi guration and
operation. This version includes
a USB port and SD card slot for
easy data logging.
This chart shows a transition from a starting condition of
50%RH at 23°C to 25%RH at 50°C. The transition time shown
is purely that of the climatic chamber: no time is wasted
waiting for the Optidew to stabilise.
Ideal for use as an easily
transportable reference
hygrometer. Either as a transfer
standard to make fi eld calibrations of climatic chambers, or in
combination with a Michell HygroCal100 for validation of RH
probes.
The optional transport case allows use of the instrument
without even unpacking it – great for fi eld service work.
Optidew 501 – with display
The wall mounted Optidew
501 is designed for continuous
measurements of humidity
in industrial environments.
Modbus over RS485 is provided
as standard, with the option of
Modbus TCP over Ethernet for
simple networking of multiple
instruments.
A 316 Stainless steel sensor
block is available to connect the sensor to a fl owing sample. It
features an additional port so that a pressure transmitter can
be installed directly at the point of measurement.
Choice of sensors to suit different
applications
The dual-stage harsh environment sensor is designed for
tough industrial conditions and allows high temperature
measurements up to 120°C, for applications in metallurgy and
fuel cell testing.
The standard sensor is available with single- or dual-stage
cooling and is a reliable and cost-effective option for many
environmental control applications.
The optional pressure sensor gives additional detail about
the measurement. You can now clearly see whether changes
in dew point are related to moisture content or pressure. If
moisture content needs to be displayed in ppm
live pressure changes will be compensated for.
or g/kg, any
V
The Optidew 501 has the same touch screen interface as the
bench mount version. Operators can easily interrogate and
confi gure the instrument locally or remotely via the application
software.
Optidew 501 – transmitter
The most cost effective option
is the wall mounted Optidew
501 blind transmitter. All the
features of the other models are
available when connected to a
PC and operated via Michell’s
universal software. The multi-color
LED indicator also displays the
instrument’s status.
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Chilled Mirror Instruments
119
1
4
688"
Fast responding chilled mirror
technology
All chilled mirror sensors measure the actual temperature
that moisture condenses to provide a reading of dew point.
This fundamental technique gives unparalleled accuracy and
reliability. Chilled mirror hygrometers are commonly used as
secondary or transfer calibration standards for humidity.
The new design uses a thin, fast responding hybrid mirror
that is highly resistant to corrosion from acids and other gas
contaminants, outlasting any traditional cooled mirror sensor
design.
Dynamic Contamination Control (DCC) Plus
DCC Plus is an improved version of our Dynamic
Contamination Control. This feature is designed to manage
the contamination on the mirror surface, extending operation
in harsh or dirty environments without the need to stop the
process to manually clean the mirror.
Improved frost assurance
Increased reliability at low dew points
It is possible for water to exist in liquid phase below 0°C as
super cooled water. When using a chilled mirror instrument,
liquid water may exist at temperatures down to –30°C in
certain conditions. The difference in vapor pressure between
condensed water and ice formed on a chilled mirror can
introduce dew-point errors of up to 10% of reading. The new
adaptive FAST system gives certainty about the state of the
mirror condensate, detecting when supercooled water could
form during measurement, and cooling the mirror suffi ciently
to freeze it, without the need for a DCC.
Dimensions
145.0mm 5.709"
46.0mm 1.811"
240.0mm 9.449"
260.0mm 10.236"
220.0mm 8.661"
103.2mm 4.063"
46.2mm 1.819"
180.0mm 7.087"
69.5mm 2.736"
32.2mm 1.268"
172.0mm 6.772"
220.0mm 8.661"
.
mm
.
44.7mm 1.760"
Ø10.5mm [0.413”]
Ø3.7mm [0.146”]*
1mm [0.039”]
32.0mm 1.260"
M36 x 1.5
M30 x 1.5
28.0mm 1.102"
Weld burr may extend 1mm from colar to towards tip of probe
5.6mm [0.22”]
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Chilled Mirror Instruments
Technical Specifi cations
Performance
Dew Point Measurement Accuracy ±0.15°C
Repeatability ±0.05°C
Sensitivity ±0.01°C
Response Stable measurement at +10°C dp within 1 minute
Dew-Point Sensor
Sensor Single Stage Dual Stage Harsh Environment
Dew Point Range (°C) -25 to +90°C -40 to +90°C -40 to +120°C
Temperature Range (°C) -40 to +90°C -40 to +90°C -40 to +120°C
% RH Range @ 23°C 2.25 to 100% RH 0.45 to 100% RH 0.45 to 100% RH
Material POM (head)
Corrosion & Saturation
Protection
Mirror Temperature Measurement Pt1000, Class A
Recommended Sample Flow Ambient (environmental measurements) to 2Nl/min (fl owing sample)
Pressure 2500 kPa max
Process Connection M36x1.5
Aluminium (body)
Active Component Isolation System
Remote PRT
Temperature Measurement Accuracy ±0.1°C
Temperature Measurement PT100, Class A
Cables
Cable Length 0.3, 3, 5, 10 and 20m lengths available (cables can be combined)
Maximum operating temperature Standard: 90°C max. High temperature: 120°C max.
Remote Pressure Sensor (Optional)
Pressure Measurement Accuracy ±0.25% FS
Pressure Measurement Range 0-160 kPa OR 0-2500 kPa
Process Connection 1/8” NPT-M
Control Unit
Resolution 1 or 2 decimal places selectable
Measurement Units °Cdp or °Fdp, Relative humidity - %, Absolute humidity - g/m
Enclosure Wall Mount - Optidew 501 Bench Top - Optidew 401
Material ABS ABS
Analog Outputs Two 0/4-20mA outputs (maximum load 500Ω) Two 0/4-20mA outputs (maximum load 500Ω)
Digital Communications Modbus RTU over RS485 (standard)
Alarms 1x Process Relay,
Inputs 4-20mA for pressure sensor 4-20mA for pressure sensor
Data Logging SD card slot (optional) SD card slot (standard)
Ingress Protection IP54 (standard), IP65 (optional) IP54
Dimensions 220x175x75mm 220x175x118mm
Weight Control unit: 1.5kg, Sensor: 200g Control unit: 1.5kg, Sensor: 200g
Display 5.7” color touch screen (optional) 5.7” color touch screen
Environmental Conditions -20 to +50°C, up to 100%RH non-condensing (optional) 100% RH condensing with IP65 connector version
Supply Voltage 100 to 240VAC, 50 to 60Hz
Power Consumption 30VA max
(Twb) - °C, °F, Water Vapor Pressure (wvp) - Pa, Ambient Temperature - °C, °F, Pressure converted DP - °C, °F,
Pressure - kPa, Bara, Barg, Psia, Psig
Modbus TCP over Ethernet (optional)
1x Alarm Relay,
Both Form C, 1A, 30Vdc.
POM (head)
Aluminium (body)
PEEK (head)
Aluminium (body)
3
, ppmV, Mixing Ratio - g/kg, Wet Bulb Temperature
Modbus RTU over:
USB (standard)
RS485 (standard)
Modbus TCP over Ethernet (optional)
1x Process Relay,
1x Alarm Relay,
Both Form C, 1A, 30Vdc
Rotronic Instruments Corp. 135 Engineers Road, Suite 150, Hauppauge NY 11788 Tel: 631 427 3898, Email: us.info@
michell.com, Web: www.michell.com/us
Michell Instruments adopts a continuous development programme which sometimes necessitates specifi cation changes without notice.
Issue no: Optidew_97552_V3_US_1018
© 2018 Michell Instruments
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