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Yokogawa Electric Corporation

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FAQ (Q&A) -Tunable Diode Laser Analyzers-

｜ Optical Path Length ｜ Optical Axis ｜ Purging ｜ Typical System Configurations ｜ Measurement Method ｜ Dust ｜ Interference, Temperature and Pressure Effects and Compensation ｜ Other Specifications ｜ Installation ｜ Calibration and validation ｜ Maintenance ｜ Applications ｜

Optical Path Length

Q1 How is the optical path length defined?
Q2 What is the maximum optical path length?
Q3 How long is the laser beam diameter?
Q4 What is the allowable decrease in the light intensity?
Q5 How far is the laser scan range?

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Optical Axis

Q1 How is the optical axis aligned (when the optical path length is up to 6 meters)? How often should the optical axis be aligned?
Q2 How is the optical axis aligned when the optical path length exceeds 6 meters?
Q3 For the alignment of laser beam axis at the Launch and Detect units, vertical and horizontal alignments are performed two times each. Are there any ways (data) to check the accuracy?

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Purging

Q1 Why does the instrument need to be purged by gas?
Q2 What determines the flow rate and type of purge gas?
Q3 Does dirt adhere to the pane that comes in contact with the process gas?

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Typical System Configurations

Q1 What are typical system configurations?
Q2 When up to 8 analyzers are connected to the RIU (Remote Interface Unit), can I view the readings of all analyzers connected and configure the parameter of them on the single RIU?

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Measurement Method

Q1 What is the peak area integration method?

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Dust

Q1 Does the dust affect the broadening of absorption spectrum?
Q2 Is the TDLS200 affected by dust?

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Interference, Temperature and Pressure Effects and Compensation

Q1 If spectral interference exists, are there any ways to separate it?
Q2 Is the TDLS200 affected by the temperature change (sample gas, ambient air)?
Q3 The gas temperature effect on peak area is non-linear.
How is it compensated?
Q4 Is the target component gas affected by oxygen (O2), moisture (H2O), or other different components that coexist in the process gas?

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Other Specifications

Q1 As for the message of the indicator, is Japanese also possible?
Q2 What is the limit of operating temperature of the Launch and Detect units?
Q3 What is the maximum distance between the Process flange and the Launch/Detect unit?
Q4 Does duct vibration or other vibration affect the integral-type converter?
Does vibration cause misalignment of the optical axis?
Q5 Do water droplets on the window affect the measurement?
Q6 How much is the warming-up time?
Q7 The General Specifications say that the upper limit of ambient temperature of the TDLS200 is 50 ℃. The ambient temperature of the analyzer may easily get higher because of radiant heat from a furnace.

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Installation

Q1 Can the Detect Unit be mounted vertically?
Q2 Is a startup needed?
Q3 When through bolts are operated for optical axis alignment, is there a risk of leak of process gas at the flange?
Q4 What is the maximum distance between the Detect Unit and the Remote Interface Unit?
Q5 Can YHQ customize an instrument that can be installed in a cold place with sub-zero temperatures?
Q6 The units weigh heavy but they are supported only by the flanges. Isn’t there any problem?
Q7 Why is the optical path length needed to be set on the instrument after installation?
Q8 When the process gas pressure is high, how is the instrument to be installed?

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Calibration and validation

Q1 What is the validation?
Q2 How is the instrument calibrated?
Q3 How is moisture proofread for the water analyzer?
Q4 Can calibration be performed in the field?
How often should calibration and validation be performed?

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Maintenance

Q1 How long is the service life of a laser light source?
Q2 Are there any recommended replacement components?
Q3 After cleaning or replacing the windows, does the optical axis need alignment?
Q4 How frequently is the maintenance required?

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Applications

Q1 What applications has the TDLS200 been used in so far?
Are there any applications or customer data available?

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