- Brand: Michell Instruments
Tags: Optidew, Michell, Instruments
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
configurations, 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..
Product 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
Technical Specification
Performance | |||
Dew Point Measurement Accuracy | ±0.15°C | ||
Reproducibility | ±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 |
Mirror Temperature Measurement | Pt1000,DIN Class A | ||
Corrosion & Saturation Protection | ACIS (Active Component Isolation System) | ||
Recommended Sample Flow | Ambient (environmental measurements) to 2Nl/min (flowing sample) | ||
Pressure | 2500 kPa max | ||
Sensor Cable | Standard: 90°C max. High temperature: 125°C max. | ||
Cable Length | 0.3, 3, 5, 10 and 20m lengths available | ||
Process Connection | M36x1.5 | ||
Remote PRT | |||
Temperature Measurement Accuracy | ±0.1°C | ||
Cable Length | 0.3, 3, 5, 10 and 20m lengths available | ||
Temperature Measurement | PT100, Class A | ||
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 | ||
Output | 4-20mA | ||
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 |