- laboratory air humidity samples
- extremely wide scope of humidity measurements (0,003...100%RH, -95...+95°C DP)
- possibility of gas measurement under pressure (optionally up to 10 bar)
- high accuracy (RH 1%, 0.1°C DP)
- Swiss precision
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A hygrometry with a chilled mirror is a method of gas humidity
measurement through dew or frost point temperature measurement
(described below). A light source sends a ray to a polished mirror
surface - its temperature is controlled by a heat pump known as a
Peltier's element. A photosensitive receiver measures the ray's of
light
intensity, which is reflected from the mirror. When the mirror is
clean and
dry the reflected light's intensity is maximum. On the contrary, cold
mirror layered with frost or water steam condensed on its surface,
diffuses the light, what results in diminished signal value
from the light sensitive element. Using this signal as feedback in a
closed regulation loop allows on controlling the mirror's temperature
in
such way so thickness of the condensed layer is constant. The condensed
layer of fixed thickness stays in dynamic equilibrium with gas
surrounding the mirror. In this equilibrium the dew or frost point
temperature is defined by the measured mirror temperature. If the
condensate is in a liquid form (even for the temperatures below water
freezing) then the mirror temperature is the same as dew point
temperature. If the
condensate is in a solid form (ice or frost) then the mirror
temperature is taken for the frost point temperature.
Our offer includes humidity meters with a chilled mirror produced by
MBW
Calibration Ltd. (Switzerland) - models designed especially for
precise laboratory measurements, for other hygrometers' calibration and
for the measurements of very dry gases. The technical specifications,
mechanical construction, additional functions and their destination
were introduced for each one of the models in separate leaflets.
| TYPE | SCOPE OF DP MEASUREMENT | FEATURES | PICTURE |
|---|---|---|---|
| 373 | -95..+95 °C (in different versions) | Humidity standard Hygrometer calibration Precise laboratory measurements Dry gases measurement Graphic, color LCD screen Full automation |
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| 973-SF6 |
from -60 °C | Filed measurements (portable device) Dry gases measurement Measurements in SF6 Digital readings |
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| 473 | -20..+70 °C | Filed and laboratory measurements, external measuring head |
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