To evaluate real-world performance, ESEGAS conducted a comprehensive laboratory verification of its ESE-LASER-300 Online TDL HF Analyzer. The test focused on the key indicators that matter most in industrial gas analysis:
- Measurement accuracy
- Repeatability
- Long-term stability
The following sections examine the test conditions, measured data, and what the results reveal about the gas analyzer’s overall performance.
What Were the Test Conditions for the Online TDL HF Analyzer?
Reliable performance evaluation begins with controlled testing conditions. The HF Analyzer was tested under stable laboratory parameters designed to verify its ability to measure low-level HF concentrations accurately.
| Parameter | Value |
|---|---|
| Measured Gas | HF |
| Measurement Range | 0–100 ppm |
| Resolution | 0.1 ppm |
| Accuracy Specification | ±1% F.S. |
| Ambient Temperature | 28°C |
| Relative Humidity | 51% RH |
| Atmospheric Pressure | 100.3 kPa |
| Standard HF Gas | 200 ppm HF |
| Balance Gas | N₂ |
| Gas Flow Rate | 2 L/min |
| T90 Response Time Requirement | 30 s |
The TDLAS-based online gas analyzer was challenged at multiple concentration points across its measurement range. This testing method verifies not only calibration performance but also linearity and consistency throughout the operating span.
Because HF is highly reactive, maintaining measurement stability across different concentrations is often more difficult than measuring inert gases. As a result, accuracy, repeatability, and drift performance become especially important when evaluating an online TDL HF analyzer.
How Did the Online TDL HF Analyzer Perform During Testing?
| Accuracy | Standard value | N2 | 20ppm | 50ppm | 80ppm | Gas Flow: 2L/min | |
| Measured value | 0.0 | 19.8 | 50.2 | 80.4 | |||
| Result | ≤±1%F.S. | ||||||
| Repeatability | Times | 1 | 2 | 3 | 4 | 5 | 6 |
| Data | 50.2 | 50.3 | 50.1 | 50.3 | 50.2 | 50.4 | |
| Result | ＜1% | ||||||
| Stability (48h) | Time | 0h | 18h | 22h | 28h | 48h | |
| Air/N2 | 0.0 | 0.0 | 0.1 | 0.1 | 0.2 | ||
| Span | 100.1 | 100.3 | 100.2 | 100.3 | 100.5 | ||
| Zero Drift | ≤±1%F.S. | Span Drift | ≤±1%F.S. | ||||
Accuracy
The maximum deviation recorded during testing was only 0.4 ppm. For a 100 ppm full-scale range, the allowable specification is ±1 ppm. The observed error remained well below this limit at every test point.
Repeatability
Key findings include:
- Maximum variation: 0.3 ppm
- Average reading: approximately 50.25 ppm
- Repeatability result: better than 1%
The extremely narrow spread demonstrates excellent measurement consistency.
Stability
After 48 hours, the zero-point deviation reached only 0.2 ppm. This result represents just 0.2% of full scale, significantly better than the ±1% F.S. requirement.
The maximum span variation observed during the 48-hour test was only 0.4 ppm. This corresponds to 0.4% of full scale. Again, the result remained comfortably below the gas analyzer’s specified tolerance.
How Does the ESEGAS Online TDL HF Analyzer Achieve These Performance Results?
The test report demonstrates excellent accuracy, repeatability, and stability. However, the more important question is this: What enables the ESE-LASER-300 Online TDL HF Analyzer to deliver such consistent performance? The answer lies in its advanced TDLAS platform and application-oriented system design.
TDLAS technology provides the foundation for high-accuracy HF measurement. The ESEGAS Online TDL HF Analyzer employs Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology to measure hydrogen fluoride directly.
Instead of relying on electrochemical reactions or broadband infrared absorption, TDLAS uses a narrow-linewidth laser tuned to a specific HF absorption line. The gas analyzer continuously scans this molecular “fingerprint” and calculates concentration based on the amount of absorbed laser energy.
Because the laser targets only the selected HF absorption wavelength, the gas analyzer achieves exceptionally high selectivity and minimizes interference from background gases. TDLAS systems are widely recognized for their superior spectral resolution, fast response, and low detection limits compared with many conventional gas analysis technologies.
Key technical features include:
- Ultra-low detection limits down to the ppb level
- Direct HF molecular absorption measurement
- High spectral resolution
- Excellent resistance to cross-interference
- Real-time online monitoring
- Long-term measurement stability
For challenging applications where moisture, acid gases, or complex process streams are present, these advantages become particularly important. The gas analyzer can distinguish HF from surrounding gases with high confidence, helping operators obtain more reliable process data. TDLAS technology is especially valued for its ability to provide highly selective measurements while maintaining fast response and low maintenance requirements.
Conclusion
The Online TDL HF Analyzer demonstrated strong performance across every key evaluation category.
Key Results
- Accuracy: Maximum deviation of only ±0.4 ppm
- Repeatability: Better than 1%
- Zero Drift: 0.2 ppm after 48 hours
- Span Drift: 0.4 ppm after 48 hours
- Resolution: 0.1 ppm
- Response Time: T90 of 30 seconds
All parameters remained well within the specified ±1% Full Scale (F.S.) requirement.
For industries that require reliable HF measurement—including fluorochemical production, semiconductor manufacturing, waste incineration, aluminum processing, and environmental monitoring—the Online TDL HF Analyzer ESE-LASER-300 offers a combination of accuracy, stability, and fast response that supports both regulatory compliance and process efficiency.
If you want to design your online TDL HF analyzer, contact with us please!
FAQs:
Q: What is an Online TDL HF Analyzer?
A: An Online TDL HF Analyzer is a continuous gas monitoring system that uses Tunable Diode Laser Absorption Spectroscopy (TDLAS) to measure hydrogen fluoride (HF) concentrations in real time. The analyzer detects HF by targeting a specific molecular absorption wavelength, providing high selectivity, fast response, and stable long-term operation.
Q: How accurate is the ESE-LASER-300 Online TDL HF Analyzer?
A: According to the test report, the ESE-LASER-300 achieved a maximum measurement deviation of only ±0.4 ppm within a 0–100 ppm measuring range. The largest error occurred at the 80 ppm test point, where the analyzer displayed 80.4 ppm. This result remained well within the specified ±1% Full Scale (F.S.) accuracy requirement.
Q: What measuring range was tested for the Online TDL HF Analyzer?
A: The analyzer was tested over a 0–100 ppm HF range with a resolution of 0.1 ppm. Calibration verification was performed at multiple concentration points, including 0 ppm, 20 ppm, 50 ppm, and 80 ppm, to evaluate linearity and accuracy across the measuring range.
Q: How repeatable are the measurement results?
A: The analyzer demonstrated excellent repeatability during six consecutive measurements at approximately 50 ppm HF. Readings ranged from 50.1 ppm to 50.4 ppm, producing a total variation of only 0.3 ppm. The repeatability result was significantly better than the specified requirement of less than 1%.
Q: What is zero drift in an Online TDL HF Analyzer?
A: Zero drift refers to the change in analyzer output when measuring zero gas over time. It reflects the stability of the analyzer baseline. During the 48-hour stability test, the ESE-LASER-300 exhibited a zero drift of only 0.2 ppm, demonstrating excellent long-term measurement stability.
Q: What is span drift and why is it important?
A: Span drift measures the change in analyzer response at a known calibration concentration over time. Low span drift indicates that the analyzer maintains calibration accuracy during continuous operation. In the test report, the ESE-LASER-300 recorded a span drift of only 0.4 ppm after 48 hours, well below the ±1% F.S. specification.
Q: Can an Online TDL HF Analyzer operate continuously for industrial monitoring?
A: Yes. Online TDL HF Analyzers are specifically designed for continuous operation. The low zero drift, low span drift, and stable optical measurement principle make them suitable for 24/7 monitoring in industrial process streams and emission control systems.
Q: Does the ESE-LASER-300 test report confirm compliance with its specifications?
A: Yes. The test results show that the analyzer met or exceeded all major performance specifications. Accuracy, repeatability, response time, zero drift, and span drift all remained comfortably within the stated ±1% Full Scale performance requirement, demonstrating reliable measurement capability for continuous HF monitoring applications.
