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Trace Nitrogen in Argon Analyzer
The following list is keyed to Figure 1-3 and serves to identify and
briefly describe the function of various internal components of the
Model 2120 analyzer.
1. Card Cage for PCB's — Contains the amplifier board, 4-20
mA conversion board, test point jacks. The interface board is on
rear of cage.
2. PMT Cover —Shields the PMT for noise reduction and
protects it from atmospheric impurities.
3. Hamamatsu PMT Socket — The socket contains the high
voltage supply for the PMT, the resistor ladder for the intermediate
dynodes in the PMT, and a 1.22 VDC reference voltage generator.
4. Control Relay — Controls the high voltage transformer.
5. Digital Panel Meter—Displays the nitrogen content of the
sample stream in parts-per-million (ppm).
6. Sample Vent Port — 1/4-in (0 64-cm) Swagelok compression
fitting marked VENT. Used to connect the sample outlet line to
the vent system.
7. Analytical Cell — Cell through which an argon sample stream
passes at flow rate.
8. Sample Input Port With Flow Control Orifice — 1/4-in
(0.64-cm) VCR fitting marked INPUT Used to connect the
sample inlet line to the analyzer. Sample flow is controlled by
an internal orifice at this input.
9. Power Entry Module — Main power on/off function,
connector for input power cable, and fuse holder for the
analyzer. Protects analyzer from input power surges and power
supply from shorts.
10. Optical Filter—Optically filters for wavelength of impurity
emission.
11. High Voltage Transformer — Supplies ionization voltage to
the analytical cell causing the sample gas to glow. The
transformer is powered by the AC line voltage.
12. Regulated 255-Hz Power Supply — A crystal-controlled
power supply with an adjustable output. The output is set to
supply a modulated 90 VAC output to the high voltage
transformer to ionize the sample gas in the analytical cell.
Teledyne Analytical Instruments
Introduction
7
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