High precision chilled mirror device for dew point measurement

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MBW 373

laboratory reference
high precision
fast response

A high precision chilled mirror device to measure the dew point, or frost point, of a gas.

The temperature of a polished mirror is closely controlled so that a layer of condensation (dew or frost) is maintained at a constant thickness. The 373 chilled mirror series from MBW offers a wide range of instruments suitable for precision measurements of humidity.

The mirror is illuminated, and a light-sensitive detector determines the thickness of condensation on the mirror surface. Automatic control of the mirror temperature, using thermo-electric coolers (or a peltiers device), cools the mirror to a temperature at which condensation occurs. Once a thin layer of condensation is present, careful control of the mirror temperature maintains a constant thickness of condensation.

Quick response at low level measurements can be achieved with ORIS, a unique facility to improve response time without affecting accuracy or stability. Download the data sheet for the MBW373 for more information

	S	H	HX	L	LX	LHX
GENERAL
Range: Dew/Frost point °C	-60 to +20	-40 to +70	-40 to +95	-75 to +20	-95 to +20	-75 to +95
Thermoelectric mirror cooling	3-stage
ORIS	Optional	No		Yes
Cooling	Air/Water			Refrigeration
Measuring head heating °C	No	+80	+100	+40	+40	+100
Internal pump	Optional	Yes		Optional		Yes
Accuracy	± 0.1 °C Dew/Frost Point
Reproducability	± 0.05 °C Dew/Frost Point
Display	Active Matrix Color Graphic LCD
Digital I/O	RS-232
Analogue output	2 selectable ± 10 V 4 to 20 mA
Gas couplings	Swagelok^® 6 mm or 1/4" VCR Cajon^® 1/4" optional
Mirror temperature sensors	RTD (Pt-100)
External temperature sensors	RTD (Pt-100) measuring range: -50 to +100 °C
Sample gas pressure	2000 hPa abs. 1 MPa abs. optional
Sample gas flow rate	0 to 2 l/min
Sample gas circuit	Stainless steel, 316 / 316L, electro polished
Operation temperature	+15 to +35 °C
Storage temperature	-10 to +50 °C
Ambient humidity	90% RH max., non-condensing
MECHANICAL
Width	449 mm				520 mm	449 mm
Height	236 mm				255 mm	236 mm
Depth	461 mm			511 mm	500 mm	511 mm
Weight	20 kg	25 kg	25 kg	35 kg	45 kg	38 kg
ELECTRICAL
Voltage	100-120 VAC / 200-240 VAC, 50/60 Hz (auto-switching)			100-120 VAC, 50/60 Hz or 200-240 VAC, 50/60 Hz
Power consumption	200 W	300 W	300 W	300 W	500 W	500 W
All specifications subject to change