DewTracermini CRDS-H2O
Cavity Ring Down Spectroscopy
Trace Moisture Analyser

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DewTracer mini CRDS-H2O has been developed with cooperation ofthe National Institute of Advanced Industrial and Technology (AIST).

DewTracer mini CRDS-H2O is an innovative miniaturised Cavity Ring-Down Spectroscopy (CRDS) trace moisture analyser that can measure trace moisture in the rangeof 12 ~ 20000 ppbv (-100 ~ 55 °C DP) with fast response and high accuracy.
Based on an absolute measurement method with high long-term reliability,DewTracer mini CRDS-H2O provides reliable trace moisture control for R&D and manufacturing with advanced technology.

DewTracer mini CRDS-H2O
DewTracer mini CRDS-H2O
In collaboration with the National Institute of Advanced Industrial and Technology (AIST), the world leader in R&D fortrace moisture measurement, SHINYEI has succeeded in developing a miniaturised CRDS sensor with unique spectrum
analysis technology. DewTracer mini CRDS-H2O with mini CRDS sensor technology is an innovative trace moisture analyser with both compact size and high performance, providing a new solution for trace moisture measurement.

ppbv

ppbv

DewTracer mini CRDS-H2O sensor has small cavity volume which means that gases in this cavity are replaced quickly, and its measurement can rapidly trace sudden changes in trace moisture with SHINYEI unique spectral analysis.

Time (sec)Time (sec)

The measurement accuracy and stability of DewTracer mini CRDS-H2O is verified
by AIST through comparative evaluation with primary standards.
Primary Standard (AIST)

mini CRDS H2O

mini CRDS H2O

ppbv

ppbv

Primary Standard (AIST)Time (h)Time (h)Cavity Ring-Down Spectroscopy (CRDS) trace moisture analyser is an absolute measurement method and canmeasure trace moisture with fast response, high accuracy, and long-term reliability.
In CRDS, the beam from the laser diode enters a cavity with two high reflectivity mirrors
to detect the amount of laser absorption by moisture in the sample gases in the cavity.
When the laser is on, the cavity rapidly fills with circulating laser light, and the moisture in
the cavity can be analysed by detecting small amount of light leaking from one of themirrors in the cavity and measuring the time it takes for the light in the cavity to decay to1/e of its initial intensity (ring-down time).
Laser light is absorbed by trace moisture during reflection in cavity.

Light intensity decay time becomes faster with high trace moisture.

CavityLight intensity

Laser

Trace moisture mete that use the moisture adsorption and desorption principle (e.g.
capacitive, aluminum oxide etc.) calculate amount of moisture based on calibration
curve that is set independently by each manufacturer. The deviation of the calibration
curve due to sensor dispersion, changes in use or over time must be adjusted eachtime based on the results of a comparison calibration with a standard.
CRDS is called an absolute measurement method because it can be calculated
directly from measured values of known physical constants without a calibration
curve. The light decay time, which is the measuring principle of CRDS, does notdepend on the light intensity of the incident light, so even if the light intensity decreases due to the ageing of the laser, the measurement accuracy is not affected. Therefore, it has the advantage of high reliability of long-term measurement and the frequency of periodic calibration can be reduced.

TimeSensor unit and monitor unit can be separated, or a PC with the bundled software installed also can be used insteadof the monitor unit. This provides the best installation options for applications and locations.
- Sensor Unit + PC

- Benchtop- Wall mount

Monitor unit with 5-inch colour touch panel for starting and stopping measurements, and making various settings. Themonitor screen displays measurements and trend graphs. It also has screen lock function to prevent malfunction, a status function to check the instrument's operating status, and an alarm function to determine the set threshold value. Whena PC is used instead of the monitor unit, the same functions as the monitor unit can be used with the bundled software.
Digital (RS-232C), analogue (4 - 20 mA, option), or alarm (MOS FET relay, option) are available.
UJR / VCR fittings are used for sample gas IN-OUT. Additional ports for purging the inside of the sensor unit with nitrogen, etc. are also available as options.

DewTracer mini CRDS-H2O

EnvironmentalOperation

10 ~ 40 °C

35 ~ 80 %rh (w/o condensation)

Conditions

Storage-10 ~ 40 °C

35 ~ 80 %rh (w/o condensation)

Measurement [H2O]

Range

12 ppbv ~20 ppmv

Response

Approx. 60 sec (50 ppbv ó 1000 ppbv / 90% Response)

Accuracy±4% or LDL (12 ppbv )TypeAir, N2, O2, Ar etc.

Temperature

5 ~ 60 °C

Flow Rate

Units

Outputin N2* Please ask us for other gases.

2.0 L / min

Pressure

86 ~ 106 kPaA (w/ Option CRDS-002 : 50 ~ 900 kPaA , w/ Option CRDS-003 : 50 ~ 550 kPaA)

Measurement

ppbv / ppmv (H2O) , °C (Sample Gas Temperature) , PaA (Sample Gas Pressure)Calculation

C (Dew point / Frost point)

DigitalRS-232C

Analogue4 ~ 20 mA

Alarm

MOS FET relay (100 V / 300 mA)* w/ Option (CRDS-005)* w/ Option (CRDS-006)

Fittings

IN-OUT : 1/4 inch ( UJR-RP / FUJIKINPower Supply

AC Adapter (100 ~ 240 VAC, 50 / 60 Hz , 1.4 A max

WeightSensor unit : Approx. 5 kg , Monitor unit : Approx. 1.7 kg

Dimensions [ mm ]Sensor unit

Monitor unit
15075.4200300165

150

w/ Purge Portmini CRDS–H2OBN0D00

Rack Mount Adapter (19 inch)

CRDS-001

w/o Purge Port

mini CRDS–H2OBN0D02

Pressure Regulator + Orifice Plate

CRDS-002

Orifice Plate

CRDS-003

mini CRDS PC–D0V1

Sintered Metal Filter (15 µm)

CRDS-004

Analogue Output

CRDS-005

4 ~ 20 mA)

MOS FET Relay

CRDS-006

Carrying Case

CRDS-007

Sampling Pump

CRDS-008

6-5-2 Minatojima-Minamimachi, Chuo-ku, Kobe 650-0047 Japan
Phone : +81-78-304-6790 Fax : +81-78-302-1225
Contact : https://www.shinyei.co.jp/stc/eng/contact.html

V 1.0 _ Jan 2024

Sample Gas

Dew point : -100 ~ -55 °C)