Precision dew point measurements at up to 20 Bar.
Model MBW 973 provides a fundamental dew point measurement. The 973 gives the user an intuitive touch screen interface, allowing easy monitoring of key measurement parameters and system health. The mirror check facility allows the user to vaporise accumulated condensates without having to disassemble the instrument.
Optimum Response Injection System (ORIS)
The ORIS is a feature unique to MBW chilled mirror devices. This pre-programmed vapour injection system accelerates stabilisation times when measuring at low dew point levels. A layer of frost is built on the mirror to rapidly achieve an equilibrium point where the rate of sublimation and condensation are equal.
ForcefrostTM function
Below 0 °C water may condense as either liquid or solid. This is a particular problem when working at dew points just below 0 °C, and can cause up to a 3 °C difference in condensation temperature. For correct calculation of relative humidity (rh), the phase of the condensate must be known. When the Forcefrost function is activated at a user defined temperature the mirror over-cools to ensure that a frost is formed when below 0 °C, and to remove the uncertainty.
COMPATIBLE MEASURING HEADS
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Pressure Sensor
Integrated pressure measurement in the 973 means that calculation of ppmv can be performed accurately. As the 973 can be used as a calibration device, other devices under calibration can be corrected for pressure dew point calculation.
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PRT Temperature Probe
The 973 is supplied with a 4-wire PT100 Platinum Resistance thermometer (PRT). This allows precise temperature measurement for the calculation of relative humidity.
Range: -50 to +100 °C
Ø2 x 100 mm PRT on 3m cable
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Transit Case
Each 973 is supplied with a robust IP65 transit case for safe transportation to site for calibration projects.
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GENERAL
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Measuring range
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Frost/Dew point
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-60 to +20 °C
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Temperature
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-50 to +100 °C
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Relative humidity
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0.1 to 100 %rh
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Humidity content by volume
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100 to 20,000 ppm
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Humidity content by weight
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5 to 2,500 ppm
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Accuracy
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Frost/Dew point
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≤ ± 0.1 °C (-60 to +20 °C), ± 0.3 °C
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Temperature
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≤ ± 0.1 °C
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Relative humidity
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≤ ± 0.5 %rh
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Pressure
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≤ ± 0.1 % range
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Reproducability
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Frost/Dew Point
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≤ ± 0.05 °C
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Temperature
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≤ ± 0.05 °C
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Standard Features
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Mirror
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Rhodium plated gold
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Temperature sensor
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Ø2 x 100 mm PRT on 3 m cable
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Digital I/O
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RS-232
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Thermoelectric mirror cooling
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3-stage with 80 °C depression at 20 °C ambient
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Mirror temperature sensors
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RTD (Pt100)
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Display
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5.7 " LCD with touch screen
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Internal gas tubes
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Stainless steel 316L (Inlet and Outlet) FEP outlet with sample pump
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Gas connections
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6 mm or 1/4 " Swagelok fittings
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ORIS
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Optimum Response Injection System
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Power cable
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2.5m
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Operating instructions
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English and German
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Calibration certificate
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Factory calibration: 5 points FP/DP, 3 points temperature. Upgrade to SCS accredited ISO17025 calibration available
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Optional Features
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High pressure
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10 or 20 bar internal pressure sensor (no sample pump fitted)
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Analogue outputs
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User programmable, 2 x 4 to 20 mA or 0 to 10 V
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Additional water cooling
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Extends frost/dew point range to -70 °C (water temp. 5 °C, ambient 20 °C)
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Transport case
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Custom fit foam lined Pelicase
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Additional Information
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Cooling
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Air, additional water cooling optional
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Operating conditions
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-20 to +40 °C, maximum 98 %rh non-condensing
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Storage conditions
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-20 to +50 °C
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MECHANICAL
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Instrument
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In Transport Case
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Width
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420 mm
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650 mm
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Height
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155 mm
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370 mm
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Depth
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390 mm
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510 mm
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Weight
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12 kg
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26 kg
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ELECTRICAL
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Supply
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100 to 120 VAC / 200 to 240 VAC, 50/60 Hz (auto switching)
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Power consumption
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200 Watt
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All specifications subject to change
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