Michell Instruments Optidew Specifications

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

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

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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