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Michell Optidew - Industrial Grade Chilled Mirror Hygrometer

Updated:2025-03-13

Brand: PST/Michell
Model: Optidew
Description: The Optidew 401 and Optidew 501 are fast-responding chilled mirror hygrometers utilizing the latest developments in chilled mirror technology. Ideal for use in industrial humidity control and precisio
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Product Details

Michell Optidew - Industrial Grade Chilled Mirror Hygrometer Description：

Product Manual

The Optidew 401 and Optidew 501 are fast-responding chilled mirror hygrometers utilizing the latest developments in chilled mirror technology. Ideal for use in industrial humidity control and precision laboratory applications. Available in bench top and wall mount configurations as well as a transmitter version of the Optidew 501 (without a display). Featuring ±0.15 °C accuracy across its -40 to +120 °C dew-point measurement range.

Drift-Free Affordable Humidity Measurement for Industrial Applications

Features

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 ppmV & g/kg

Specifications

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) Aluminium (body)	POM (head) Aluminium (body)	PEEK (head) Aluminium (body)
Corrosion & Saturation Protection	Active Component Isolation System
Mirror Temperature Measurement	Pt1000, Class A
Recommended Sample Flow	Ambient (environmental measurements) to 2Nl/min (flowing sample)
Pressure	2500 kPa max
Process Connection	M36x1.5
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
Minimum operating temperature	-25°C (-13°F) High temperature: -40°C (-40°F)
Maximum operating temperature	Standard: 90°C High temperature: 120°C
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/m3, ppmV, Mixing Ratio - g/kg, Wet Bulb Temperature (Twb) - °C, °F, Water Vapor Pressure (wvp) - Pa, Ambient Temperature - °C, °F, Pressure converted DP - °C, °F, Pressure - kPa, Bara, Barg, Psia, Psig
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) Modbus TCP over Ethernet (optional)	Modbus RTU over: USB (standard) RS485 (standard) Modbus TCP over Ethernet (optional)
Alarms	1x Process Relay, 1x Alarm Relay, Both Form C, 1A, 30Vdc.	1x Process Relay, 1x Alarm Relay, Both Form C, 1A, 30Vdc
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” colour touch screen (optional)	5.7” colour 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