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,n..' 1•f M . ," �,h "a 'v, �nw -• NS'a" -,q.' r`':,;, .. -a)' -.•dC f Y �.L --,h"i ,.e- F _ <br /> '� �"}!. �`�''' sr{, is a-.•rc. .;W�- ,'i -+'. .w' '"..1k�� ,a. r#. ip a _i <br /> -� <br /> a«•_I ..Of+� aa.. ^, <br /> �� Lr, ,'�,,, .� .� s r ou--.�•` K>` s <br /> F.F s a. r c V ,s:. `✓- s ,'is1 s 2h°'n w �a_. - <br /> .� F'�a <br /> z� »* :. _ .-r'' � )a'-- �v ,,a;.. .•3'�,i-�.:" .a r�+c. ,;yc# ya:Ta.,�'1��' M:1..a.�M�:.wuro .t'.�� n.�i'K � �w� <br /> GROURDWATER TECHNOLOGY <br /> STANDARD OPMTTNG PROCEDURE <br /> CO27CEMING OPERATION/CALIESRATYON OF <br /> PHOTO-T0:7IZATION WALYZER <br /> SOP 19 <br /> The HNU Model 101 Photo-i,.)nization Analyzer shall be used to <br /> measure the concentration of trace gases over a range of <br /> less than 1 part per million (ppm) to 2,000 ppm by <br /> employing the principle of photo ionization for detection. <br /> The specific instrument used for investigations related to <br /> hydrocarbon contamination should be calibrated for direct <br /> readings in ppm volume/volume of benzene. This portable <br /> field analyzer consists of two components: 1) probe which <br /> contains a fan for movi;.g air into the sensor, an ultra- <br /> violet light (provides ionization energy) , an ionization <br /> chamber and signal amplifier; 2) readout assenbly which <br /> contains a battery, ion chamber bias, meter-readout and <br /> control panel. Specifics of the detection principle/theory <br /> and functions of various components can be found in the <br /> manufacture's instruction manual (HNU Systems, Inc. ) . <br /> To assure optimum performance, the photo-ionization analyzer <br /> should be calibrated with a standard gas mixture of known <br /> concentration from a pressurized container. A daily j <br /> procedure for calibration involves bringing the probe and <br /> readout in close proximity to the calibration gas, cracking <br /> the valve on the tank and checking the instrument reading. <br /> This provides a useful spot check for the instrument. <br /> f A procedure conducted weekly for more accurate calibration <br /> �! of the instrument from a pressurized container is to connect <br /> one side of a "T" to the pressurized container of calibra- <br /> tion gas, another side of the "T" to a rotameter and the <br /> ? third side of the 'IT" directly to the 8-inch extension to <br /> the photo-ionization probe. Crack the valve of the <br /> pressurized container until, a slight flow is indicated on <br /> the rotameter. The instrument draws in the volume of sample <br /> required for detection, and the flora in the rotameter <br /> i indicates an excess of sample. Now adjust the spen pot so <br /> that the instrument is reading the exact value of the <br /> 1: calibration gas, (If the instrument span setting is <br /> changed, the instrument should be turned back to the standby <br /> f position and the electronic zero should be readjusted, _�f <br /> J necessary) . <br /> f <br />