Overview
The Optical oxygen analyzer is cost-effective and suitable for stable and continuous measurement of the percentage oxygen content of most gases.
Applications
- Microelectronics(OLED/capacitor/HID)
- Lithium battery
- University and research
- Glove Boxes
- Metal heat treatment/welding
- Chemicals/Pharmaceuticals
- Air Separation Unit
- Features and advantages
Oxygen Measuring Principle
The new Optical technology is based on the unique oxygen-sensitive REDFLASH indicator showing excellent brightness. The measuring principle is based on the quenching of the REDFLASH indicator luminescence caused by collision between oxygen molecules and the REDFLASH indicator immobilized on the sensor tip or surface. The REDFLASH indicators are excitable with red light (more precisely: orange-red at a wavelength of 610-630 nm) and show an oxygen-dependent luminescence in the near infrared (NIR, 760-790 nm).
The Optical technology impresses by its high precision, high reliability, low power consumption, low cross-sensitivity, and fast response times. The red-light excitation significantly reduces interferences caused by autofluorescence and reduces stress in biological systems. The REDFLASH indicators show much higher luminescence brightness than competing products working with blue light excitation. Therefore, the duration of the red flash for a single oxygen measurement could be decreased from typically 100 ms to now typically 10 ms, significantly decreasing the light dose exposed to the measuring setup. Further, due to the excellent luminescence brightness of the REDFLASH indicator, the actual sensor matrix can be now prepared much thinner, leading to fast response times of the oxygen sensors.
The measuring principle is based on a sinusoidally modulated red excitation light. This results in a phase-shifted sinusoidally modulated emission in the NIR. Optical oxygen sensor measures this phase shift (termed "dphi" in the software). The phase shift is then converted into oxygen units based on the Stern-Vollmer-Theory.
Specifications
|
Measuring principle |
Optical |
|
Display |
1.8”color LCD,160*128 pixel, English menu, Status LED Light (NAMUR NE107) |
|
Keypad |
Magnetic keypad |
|
Range |
0~100% O2 |
|
Accuracy* |
Accuracy* @ -10°C – 60°C ±0.02% O2 at 1% O2 Accuracy* @ 10°C – 40°C ±0.1% O2 at 1% O2 |
|
Resolution* |
±0.01% O2 at 1% O2 |
|
Detection limit |
0.01% O2 (100ppm) |
|
Response time (t63) |
<2 sec. |
|
Drift |
typ. <1% O2/year ** |
|
Max. number of measurements |
>500 million *** |
|
Lifetime |
typ. >5 years *** |
|
Warm-up time |
3 min (reduced accuracy during warm-up) |
|
Analog Output(Galvanic) |
4~20mA, maximum load 500Ω |
|
Relay Output(Galvanic) |
2 Relay(2A, 230V AC/DC freely set), 1 Relay(System alarm) |
|
Communication |
RS485 (MODBUS RTU Slave) |
|
Power |
19 ~ 28V DC Power, 0.5A |
|
Ambient Temperature |
-10~60℃(recommend 10℃~40℃) |
|
Process pressure(Max.) |
3Bar |
|
Sample gas flow |
30Nl/h (recommend) |
|
Process Connection |
NPT1/2" thread or KF40 flange |
|
Housing Material |
Aluminium alloy, Stainless steel |
|
Size |
Φ110*240*107 mm |
|
Weight |
1.5Kg |
|
Explosion-proof |
Ex d IICT4 optional (special housing) |
* given for factory calibration. Units of %O2 given for 1013 mbar ambient air pressure.
** at 21% O2, 25°C, 1013 mbar ambient gas pressure, protected from direct sunlight. The drift can be significantly increased after the exposure to elevated temperature >60°C or to specific chemicals (refer to section 3).
*** at 21% O2, 25°C, 1013 mbar ambient gas pressure, protected from direct sunlight.