Precision chilled mirror for pressure dew point

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MBW 973

pressure dew point up to 20 Bar
laboratory reference
high precision
fast response

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.

A graph showing the improvement in stabilisation time when using ORIS

Forcefrost^TM 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.

Frost MBW973

COMPATIBLE MEASURING HEADS
	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.
	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
	Transit Case Each 973 is supplied with a robust IP65 transit case for safe transportation to site for calibration projects.

GENERAL
Measuring range
Frost/Dew point	-60 to +20 °C
Temperature	-50 to +100 °C
Relative humidity	0.1 to 100 %rh
Humidity content by volume	100 to 20,000 ppm
Humidity content by weight	5 to 2,500 ppm
Accuracy
Frost/Dew point	≤ ± 0.1 °C (-60 to +20 °C), ± 0.3 °C
Temperature	≤ ± 0.1 °C
Relative humidity	≤ ± 0.5 %rh
Pressure	≤ ± 0.1 % range
Reproducability
Frost/Dew Point	≤ ± 0.05 °C
Temperature	≤ ± 0.05 °C
Standard Features
Mirror	Rhodium plated gold
Temperature sensor	Ø2 x 100 mm PRT on 3 m cable
Digital I/O	RS-232
Thermoelectric mirror cooling	3-stage with 80 °C depression at 20 °C ambient
Mirror temperature sensors	RTD (Pt100)
Display	5.7 " LCD with touch screen
Internal gas tubes	Stainless steel 316L (Inlet and Outlet) FEP outlet with sample pump
Gas connections	6 mm or 1/4 " Swagelok fittings
ORIS	Optimum Response Injection System
Power cable	2.5m
Operating instructions	English and German
Calibration certificate	Factory calibration: 5 points FP/DP, 3 points temperature. Upgrade to SCS accredited ISO17025 calibration available
Optional Features
High pressure	10 or 20 bar internal pressure sensor (no sample pump fitted)
Analogue outputs	User programmable, 2 x 4 to 20 mA or 0 to 10 V
Additional water cooling	Extends frost/dew point range to -70 °C (water temp. 5 °C, ambient 20 °C)
Transport case	Custom fit foam lined Pelicase
Additional Information
Cooling	Air, additional water cooling optional
Operating conditions	-20 to +40 °C, maximum 98 %rh non-condensing
Storage conditions	-20 to +50 °C
MECHANICAL
	Instrument	In Transport Case
Width	420 mm	650 mm
Height	155 mm	370 mm
Depth	390 mm	510 mm
Weight	12 kg	26 kg
ELECTRICAL
Supply	100 to 120 VAC / 200 to 240 VAC, 50/60 Hz (auto switching)
Power consumption	200 Watt
All specifications subject to change