Basic operation – Yokogawa In-Situ Gas Analyzer TDLS200 User Manual
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IM 11Y01B01-01E-A 6th Edition :Feb 13, 2013-00
<6. BASIC OPERATION>
6.5.2 Adjustment of Detector Gain for Large Aperture Optics
This section of the User’s Guide gives the guidance and procedures to adjust the detector board gain after the
analyzer is installed and powered up. This operation should be done by qualified personnel. Read instructions
fully before starting this operation. Any doubts or questions, please contact Yokogawa.
PHOTOS OF DETECTOR BOARD
RESISTOR BAG
For a TDLS200 analyzer with diverging laser beam configuration (either with or without large aperture detector
lens), a resistor bag is attached inside the detector box. The resistor bag contains the resistors with the following
values. All of them are ¼ W, 5% tolerance metal film through-hole resistors.
Resistor Bag for Analyzers With Diverging Beam Optics
Resistance (Ω)
100 1k
1.5k 2.2k 3.3k 5.1k
7.5k 11k
16k
24k
Quantity
1
2
2
2
2
2
2
2
2
2
Please record the factory gain resistors currently installed on the detector board:
R21 = _____________; R22 = _____________; R23 = ____________
PROCEDURE
1.
This procedure requires wearing a grounding strap connected to one of the grounding lugs of the
analyzer to prevent any electrostatic damage.
2. Open the detector enclosure and put on a grounding strap.
3. Identify the gain resistors R21, R22 and R23 on the detector board as shown in the photo above. They are
all plugged in sockets instead of being soldered, easy to be modified by a pair of small pliers. The existing
gain resistors have factory resistance values optimized on a calibration cell.