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 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
Optidew

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
SensorSingle StageDual StageHarsh 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°C2.25 to 100% RH0.45 to 100% RH0.45 to 100% RH
Mirror Temperature Measurement Pt1000, 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

Applications

Metrology Research & Development

Chilled Mirror Reference Instruments

S8000 Remote S8000 Remote
The S8000 Remote provides accurate measurement of dew-point, temperature and relative humidity and is designed for environmental monitoring.
S4000 TRS S4000 TRS
The S4000 TRS is Michell Instruments' industry proven chilled mirror reference hygrometer providing accurate measurement of dew point to -100°C.
S8000 S8000
Features an integrated sensor head allowing measurement in the range of -60°Cdp to +40°Cdp, combining the measurement sensitivity and ±0.1°C dew point accuracy of the RRS system.
S4000 Remote S4000 Remote
The S4000 RC provides accurate measurement of dew-point, temperature and % RH from -85°C to +80°C dew point. The remote sensor is ideal for environmental monitoring.

Calibration Instruments

HG-10 HG10
The HG10 is an automatic temperature and humidity calibration system with a wide humidity generation range.
HG-1 HG1
The HG1 is a low-cost, transportable calibrator for dew-point and relative humidity sensors with built in cooled mirror reference.
OptiCal OptiCal
The OptiCal is a premium transportable calibration solution for humidity sensors with built in cooled mirror reference.
DCS DCS
The DCS system is a premium customisable rack-mounted dew-point calibration station with cooled mirror reference.
DG2, DG3, DG4 and VDS3 Dew-Point Generators
A range of dew-point generators offering ease of use and fast response to humidity step changes.
Pressure Swing Dryers Pressure Swing Dryers
A source of very dry compressed air for use as a zero gas in humidity calibration systems, or for general laboratory applications.

Oxygen and Binary Gas Analyzers

XTC601 Binary Gas Analyzer XTC601 Binary Gas Analyzer
A robust, linear and stable thermal conductivity analyzer for measurement of binary gas mixes such as air in hydrogen, nitrogen, argon, helium or carbon-dioxide.