Dew point mirror - MBW 473
With the dew point mirror you are able to carry out precise dew point measurements and measurements of other parameters such as relative humidity. Based on condensation technology, the humidity measurement of the 473 is a measuring technique that guarantees high precision, stability and reproducibility of the results.
Highlights of the 473 dew point mirror
- Highly precise and stable humidity measurement
- Mobile measuring heads incl. temperature sensor
- Direct measurement without gas line
- Optional barometric pressure measurement
- Optional analog outputs ±10 V and 4-20 mA
- LCD color touchscreen with intuitive user operation
- Verifiable calibration
Connect and get started
The system is immediately ready for use.Digital I/O
The 473 is equipped with an RS-232 digital output for recording or remote reading of measured and calculated values.Calibration test function
With the integrated ice test function, you can check the calibration at any time to ensure system accuracy and integrity.Remote measuring heads with temperature probe
The 473 has several wired probe options. These are designed for direct placement in chambers and other environments. These are available with a PRT for accurate temperature measurement and relative humidity calculation. To measure ambient temperature, a separate temperature sensor is available either mounted on the measuring head or as a separate remote sensor with connection to the rear panel of the device.LCD display with touch screen
The 473 has a full-color LCD touch panel with a high contrast ratio and a wide viewing angle for easy operation and readability. Buttons and menus on the display allow you to configure each line of the display for a variety of humidity, temperature and pressure parameters, which can be displayed in either SI or non-SI units. A simple push of a button switches each parameter between numerical or graphical format.
Integrated (optional) pressure measurement
The optional pressure measurement enables the compensation of pressure differences at the measuring point, thus reducing the measurement uncertainty to a minimum. The pressure sensor is available with a measuring accuracy of 0.1% or 0.01%. By combining high-precision dew point, temperature and pressure measurement, the 473 can be used as a transfer standard for all three parameters.
Dew point sensor
Dew point sensor RP2
The RP2 dew point probe has a two-stage Peltier element in a compact sensor format and a connection for temperature measurement. It is supplied with a calibrated temperature probe and an extension cable to enable optimum placement in the measuring environment.
The RP2 dew point sensor is suitable for direct use in environments with air circulation such as humidity generators, climate chambers, air ducts and measurements of manufacturing processes.
Dew point probe SH2
The SH2 dew point probe has a two-stage Peltier element for controlling the mirror temperature. The measuring head is equipped with an adjustable fan that generates a uniform air flow over the mirror. If the fan is removed, the measuring head can be connected to a sample gas hose via a 6 mm or ¼ " screw connection. The measuring head is supplied with a calibrated temperature sensor and two different connection cables; a 0.5 meter cable for connection to the measuring head and a 3 meter cable for connection to the back plate of the device.The SH2 measuring head is especially suitable for climate chamber validations, use in humidity generators, fuel cell tests and on-site calibrations.
MBW dew point mirror models
The 473 is available in a range of different models, including: 473-RP2, 473-SH2. The specifications for each model can be found in the table below.
| Model | 473-RP2 |
473-SH2 |
| Measuring ranges | ||
| Frost/dew point | -20 °C to + 70 °C | -20 °C to + 70 °C |
| Relative humidity | 5 to 99 %rh | 5 to 99 %rh |
| Temperature (cable PRT) | -20 °C to + 80 °C | -20 °C to +80 °C |
| Accuracy | ||
| Frost/dew point | ±0,15 °C | ±0,1 °C |
| Temperature accuracy | ±0,07 °C | ±0.7 °C |
| Reproducibility | ||
| Dew/freezing point | ±0,07 °C | ±0,05 °C |
| temperature | ±0,05 °C | ±0,05 °C |
| Standard equipment | ||
| External temperature sensor | Ø3 x 30 mm PRT, 0.5 m cable | Ø2 x 100 mm PRT, 0.5 and 3 m cable |
| Digital interface | RS-232 | |
| Mirror temperature sensor | Platinum resistance thermometer (PT-100) | |
| Gas connection | 6 mm or ¼" Swagelok (SH2 only) | |
| Transport case | Peli 1550, custom-made and equipped with foam | |
| Power cable | 2,5 m | |
| Calibration certificate | Factory calibration: 5 points FP/TP, 3 points temperature | |
| Temperature options | ||
| Internal barometric pressure sensor | 0.1% or 0.01% accuracy, 700 to 1200 mbar | |
| Analog outputs | Two analog outputs, selectable -10 to +10 V and 4 to 20 mA | |
| Calibration upgrade | Upgrade to SCS accredited calibration ISO 17025 | |
MBW dew point mirror
MBW dew point hygrometers are used worldwide by standardization laboratories at national, accredited and industrial level. The dew point mirrors are available in different versions for freezing and dew points from -95 to +95 °C. Our MBW dew point mirrors have all the necessary functions to carry out reliable and accurate measurements under a wide range of conditions.
Dew point mirrors for chamber validation
The dew point mirrors have a higher measurement standard than integrated climate chamber systems, so they are used by manufacturers and users as a maintenance and testing tool. Dew point and temperature measurement via remote measuring head enables use in the test room with low measurement uncertainty.
The freezing/dew point measurement can be combined with a multi-channel temperature measurement system such as the MBW T12. With such a measurement system, spatial temperature and RH distribution can be measured, displayed and recorded for validation purposes.
The use of a dew point mirror usually reduces the overall measurement by up to 50 % compared to using a probe as a transfer standard. This is the result of a lower long-term drift, a more accurate temperature measurement and the lower uncertainty of the accredited dew point calibration.
- Low drift measurement of dew points and temperature
- Automated gas sampling at temperatures up to 100 °C
- Cooling mirror in probe format for direct insertion into the working volume of the chamber
- Self-priming measuring heads
- Simultaneous temperature measurement for calculating the relative humidity
- Fully self-contained and easily transportable
- Integrated calibration verification function for on-site verification of device performance
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