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Product line of Ultrasonic gas analyzer

Over 12000 units sold until April 2016 !

Ultrasonic gas analyzer can theoretically measure all kinds of mixture of two gases.
There are no consumables and it is long-lasting.
And because warm-up is not necessary and measurements can be done the moment the power is supplied.
We have applied the ultrasonic gas analyzer to measure these gases;
Rare gases, Shielding gases, Greenhouse gases such as Oxygen, Nitrogen, Hydrogen, Carbon dioxide, Helium, Argon, Xenon, Krypton, Neon, Sulfur hexafluoride, Carbon tetrafluoride, Nitrous oxide.

How does an ultrasonic gas analyzer measure concentration of gas?

Our company won the superior prize in 20th "Small and medium enterprises’ excellent new technology and new product prizes"

Our ultrasonic gas analyzer won the superior prize in 20th
"Small and medium enterprises’ excellent new technology and new product prizes" which was cosponsored by The Resona foundation For Small And Medium Enterprise Promotion and Nikkan Kogyo Shimbun. The prizes are presented every year to aim at the promotion of the technology of small and medium enterprises and to contribute to the development of industries in Japan by the cosponsorship of The Resona foundation For Small And Medium Enterprise Promotion and Nikkan Kogyo Shimbun.
The prizes are given to outstanding new technologies, new products, etc through strict evaluations in two categories which are “technology and product” and “software”.

US-100 Series

US-100-5VS type.2 / US-100-12VS type.2

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Features
Features
Dimensions
Dimensions
Specifications
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 5.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 0-1V
PIPING Hose of φ5~6.5mm in inside diameter
POWER SUPPLY Less than ±0.3V of DC +5.0V(±1.0V of DC +12.0V)
CONSUMPTION US-100-5VS type.2:0.5W max. / US-100-12VS type.2:0.8W max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 0.1kg
EXTERNAL DIMENSIONS W100×D50×H25.6
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.1%
O2/N2 0 ~ 100% 0.4%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.05%
Xe/N2、SF6/N2 0 ~ 100% 0.03%
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US-100-5VS-L / US-100-12VS-L

Picture

Features
Features
Dimensions
Specifications
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 5.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±2%FS(Max.range)
ANALOG OUTPUT DC 0-1V
PIPING Hose of φ5~6.5mm in inside diameter
POWER SUPPLY Less than ±0.3V of DC +5.0V(±1.0V of DC +12.0V)
CONSUMPTION US-100-5VS-L:0.5W max. / US-100-12VS-L:0.8W max.
AMBIENT TEMP. -20 ~ 50℃/90%RH or less
MASS Approx. 0.1kg
EXTERNAL DIMENSIONS W100×D50×H25.6
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.1%
O2/N2 0 ~ 100% 0.4%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.05%
Xe/N2、SF6/N2 0 ~ 100% 0.03%
CO2、Ar 0 ~ 30% 0.1%
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US-Ⅰ

US-I

Picture

Features
Features
Dimensions
Specifications
INSTALLATION Potable or Panel Mounting
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 4-20mA
ALARM Concentration alarm
PIPING Rc 1/4
POWER SUPPLY Analyzer:DC 11 ~ 48V
AC adapter:AC 100 ~ 240V 50/60Hz
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 1.7kg
EXTERNAL DIMENSIONS W172×D184×H90(Except tilt leg)
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.04%
O2/N2 0 ~ 100% 0.2%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.02%
Xe/N2、SF6/N2 0 ~ 100% 0.01%
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US-ⅠX

Ultrasonic portable gas analyzer US-ⅠX

Picture

Features
Features
Dimensions
Dimensions
Specifications
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 5.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
PIPING Hose of φ5~6.5mm in inside diameter
POWER SUPPLY 7.2V Lithium ion battery(Available Approx. 6 hours using)
CHARGE TIME Approx. 4 hours
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 0.6kg(Include soft case)
EXTERNAL DIMENSIONS W150×D40×H111
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.1%
O2/N2 0 ~ 100% 0.4%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.05%
Xe/N2、SF6/N2 0 ~ 100% 0.03%
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US-ⅡE

Picture

Features
Features
Dimensions
Dimensions
Example of flow
Example of flow
Specifications
INSTALLATION Stationary
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 0-1V
PIPING 1/4”Swagelok or 3/8”Swagelok
POWER SUPPLY Less than ±0.3V of DC +5.0V(±1.0V of DC +12.0V)
CONSUMPTION 0.6W max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 1kg
EXTERNAL DIMENSIONS W165×D100×H135.2
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.04%
O2/N2 0 ~ 100% 0.2%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.02%
Xe/N2、SF6/N2 0 ~ 100% 0.01%
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US-ⅡT Series

US-ⅡT-S(R) Reasonable version, Panel mount

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Features
Features
Dimensions
Dimensions
Example of flow
Example of flow
Specifications
INSTALLATION Panel Mounting
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 4-20mA、0-1V or 0-10V
PIPING Rc 1/4 or 1/4"VCR
POWER SUPPLY AC 85 ~ 260V 50/60Hz
CONSUMPTION 25VA max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 5kg
EXTERNAL DIMENSIONS W220×D252×H150
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.02%
O2/N2 0 ~ 100% 0.1%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.01%
Xe/N2、SF6/N2 0 ~ 100% 0.005%
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US-ⅡT-SH Panel mount, Portbale

Picture

Features
Features
Dimensions
Dimensions
Example of flow
Example of flow
Specifications
INSTALLATION Potable or Panel Mounting
WARM-UP TIME Approx. 100 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 4-20mA、0-1V or 0-10V
PIPING Rc 1/4
POWER SUPPLY AC 85 ~ 260V 50/60Hz
CONSUMPTION 50VA max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 6.5kg
EXTERNAL DIMENSIONS W220×D268×H150(Panel Mounting)
W220×D268×H200(Potable)
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2 0 ~ 100% 0.04%
He/N2 0 ~ 100% 0.04%
He/Air 0 ~ 100% 0.04%
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US-ⅡT-P Panel mount

Picture

Features
Features
Dimensions
Dimensions
Example of flow
Example of flow
Specifications
INSTALLATION Panel Mounting
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 4-20mA、0-1V or 0-10V
ALARM Concentration alarm, Failure alarm
PIPING Rc 1/4 or 1/4"VCR
POWER SUPPLY AC 85 ~ 260V 50/60Hz
CONSUMPTION 25VA max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 6kg
EXTERNAL DIMENSIONS W290×D235×H170
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.02%
O2/N2 0 ~ 100% 0.1%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.01%
Xe/N2、SF6/N2 0 ~ 100% 0.005%
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US-ⅠT Series

US-ⅠT-BT Portable analyzer

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Features
Features
Dimensions
Dimensions
Specifications
INSTALLATION Portable
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
SAMPLE PRESS. Atmospheric pressure ~ +20kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
PIPING 1/4”Swagelok or 1/8”Swagelok
POWER SUPPLY 12V Lithium ion battery(Available Approx. 7 hours using)
CHARGE TIME Approx. 4 hours
AMBIENT TEMP. 5 ~ 40℃/90%RH or less
MASS Approx. 7kg
EXTERNAL DIMENSIONS W330×D304×H150
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.02%
O2/N2 0 ~ 100% 0.1%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.01%
Xe/N2、SF6/N2 0 ~ 100% 0.005%
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US-ⅠT-P

Picture

Features
Features
Dimensions
Dimensions
Example of flow
Example of flow
Specifications
INSTALLATION Portable
WARM-UP TIME Approx. 10 seconds
SAMPLE TEMP. Normal temperature(50℃ Max.)
MAX. VACUUM LEVEL 46.7kPa
FLOW RATE 0.5 ~ 2.0L/min
RESPONSE TIME 90% reading is within 10 sec.
LINEARITY/REPEATABILOTY ±1%FS(Max. range)
ANALOG OUTPUT DC 4-20mA、0-1V or 0-10V
ALARM Concentration alarm, Failure alarm
PIPING Rc 1/4 or 1/4"VCR
POWER SUPPLY AC 90 ~ 110V 50/60Hz
CONSUMPTION 100VA max.
AMBIENT TEMP. 5 ~ 45℃/90%RH or less
MASS Approx. 7kg
EXTERNAL DIMENSIONS W294×D330×H170
Performance
Composition Measurement Max range Measurable minimum digit
H2/N2、He/N2、He/Air 0 ~ 50% 0.02%
O2/N2 0 ~ 100% 0.1%
Xe/Ar、Kr/N2、CF4/N2 0 ~ 100% 0.01%
Xe/N2、SF6/N2 0 ~ 100% 0.005%
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The principle of the measurement by the ultrasonic gas analyzer

How does an ultrasonic gas analyzer measure concentration of gas?

Although the speed of sound is generally known as about 340 m/s, this is the speed of sound in our atmosphere (i.e., approx.21% oxygen, Approx.79% nitrogen and at the temperature of 25℃).
If composition and temperature of gas changes, the speed of sound will also change.

The ultrasonic gas analyzer uses this characteristics.

The sensor for transmission and the sensor for reception are placed facing at each other and the sensor for transmission sends ultrasonic waves.
Ultrasonic waves pass through the measured gas and the time to reach the sensor for reception is measured.

Figure

Formula

Since the distance between sensors is known, the speed of sound can be calculated.

M=(γ×R×T/V2)×103

If the Average molecular weight of measured gas is known, each concentration of two known gases is found.
The speed of sound becomes 339.919 m/s under the environment of 50% oxygen, 50% nitrogen, and temperature of 25℃.
When The speed of sound is assigned to the formula, the average molecular weight can be calculated as approx. 30.

V=339.919m/s M =(1.4×8.314×(273.15+25)/339.919^2)=30

Since the difference of molecular weights between oxygen and nitrogen is approximately 4.
28 of the molecular weight of nitrogen is subtracted from 30 of the average molecular weight, and its answer is divided by 4, so the oxygen concentration will be calculated as approximately 50%.

O<sub>2</sub> CONCENTRATION = (M-28)/4×100 = 50%O<sub>2</sub>

Measurable mixed gas

Although we mentioned the oxygen concentration measurement in nitrogen as the example in the above explanation, The ultrasonic gas analyzer can theoretically measure all mixture of two gases. The measurable minimum digit improves more if the difference of the molecular weight between two gases is larger.
As for each speed of sound at the gas temperature of 25℃ are 329.23m/s in 100% oxygen , 351.88m/s in 100% nitrogen, and 1316.93 m/s in 100 % hydrogen.
When the distance between sensors is 10cm, the arrival times interval of oxygen- nitrogen mixed gas is approximately 20μS.
If the CPU can scan only 0.2μS, only 100 counts can be measured, so the measurable minimum digit would be 1%.
If in hydrogen-nitrogen mixed gas, the arrival times interval is approximately 208μS. The same CPU can measure approximately 1000 counts and the measurable minimum digit would be 0.1%.
If the CPU can scan 0.02μS, approximately 1000 counts can be measured, so the measurable minimum digit would be 0.1% even in oxygen-nitrogen mixed gas.
Moreover, if the distance between sensors is extended from 10cm to 20cm,
the arrival time interval would also be extended from 20μS to 40μS,
so the measurable minimum digit would become twice as small even by the CPU which can scan only 0.2μS.
Thus, there are still more elements which improve performances of the ultrasonic gas analyzer and the wide use in future is expected.

  Oxygen Nitrogen Hydrogen
Molecular weight(g/mol) 32 28 2
The speed of sound(m/s) 329.23 351.88 1316.93
Arrival times(μS) 303.95 284.19 75.93
Arrival times interval(μS) 19.76 208.26
Measurable minimum digit Approx.1% Approx.0.1%
Approx.0.1% Approx.0.01%

Measured gases until now

Oxygen(O2), Nitrogen(N2), Hydrogen(H2), Carbon dioxide(CO2), Helium(He), Argon(Ar), Xenon(Xe), Krypton(Kr), Neon(Ne), Sulfur hexafluoride(SF6), Carbon tetrafluoride(CF4), Nitrous oxide(Laughing gas,N2O)

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