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9. 0 MONITOW EQUIPMENT DPERATING INSCTIONS <br /> i <br /> 9. 1 HNU PHOTDIONIZATION DETECTOR <br /> This instrument is intended to detect compounds with ionization po- <br /> tentials of less than 10. 2 eV. Ionization potentials for specific <br /> compounds are included under monitoring methods. <br /> 1 . Before attaching the probe, check the function switch on <br /> the control panel to make sure it is in the off position. <br /> ' 2. Attach the probe by plugging in the 12-pin plug to the <br /> inter face on the readout module. <br /> 3. Turn the six-position function switch to the battery check <br /> position. The needle on the meter should read within or <br /> above the green battery arc on the scale. If not , recharge <br /> the battery. If the red indicator comes on, 'the battery <br /> should be recharged. <br /> 4. Turn the function switch to any range setting. Loos: into <br /> the end of the probe briefly to see if the lamp is on. If <br /> £ it is on, it will give a purple glow. Do not stare into <br /> the probe for any length of time as UV light can damage <br /> your eyes. The instrument is now ready for operation. <br /> i <br /> 5. To zero the instrument, turn the function switch to the <br /> - standby position and rotate the zero potentiometer until <br /> the meter reads zero. Clockwise rotation of the spar, pot <br /> produces a downscale . deflection while counterclockwise <br /> s rotation yields an upscale deflection. Note: No zero <br /> gas is needed since this is an electronic zero adjustment. <br /> adjustment. If the span adjustment setting is changed <br /> after the zero is set , the zero should be rechecked (and <br /> adjusted, if necessary) . Wait 15 to 20 seconds to ensure <br /> that the zero is stable. If necessary, readjust zero. <br /> 6. Turn function switch to the 0-20 position (or to scale to <br /> accommodate calibration gas) . <br /> 7. For calibration of the instrument from the pressurized <br /> 4 container, connect the valve (provided with the calibra- <br /> ?� tion kit) to the pressurized container of calibration , and <br /> convert the valve via Tygon tubing directly to the 8" ex- <br /> tension to the photoionization probe. Crack the valve of <br /> }� the pressurrized container until a slight flaw is indica- <br /> ted on the gauge. The instrument draws in the volume of <br /> sample required for detection, and the flow in the rata- <br /> meter indicates an excess of sample. Now adjust the span <br /> Span pot so that the instrument is reading the exact value <br /> of the calibration gas. (If the instrument span setting <br /> is changed, the instrument shoud be turned back to the <br /> standby position and the electronic zero shoudl be read- <br /> justed, if necessary) . <br /> 8. Place probe in the atmosphere to be monitored. If the <br /> needle moves to the upper limit of the scaly, change <br /> change the function switch to the next position. <br /> - 16 - <br />