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-12- 6. Turn function switch to the 0-20 position (or to scale to accommodate calibration gas) . 7. For calibration of the instrument from the pressurized con- tainer, connect the valve (provided with the calibration kit) to the pressurized container of calibration, and convert the valve via Tygon tubing directly to the 8-in, extension to the photo- ionization probe. Crack the valve of the pressurized container until a slight flow is indicated on the gauge. The instrument draws in the volume of sample required for detection, and the flow in the rotometer indicates an excess of sample. Now adjust the span pot so that the instrument is reading the exact value of the calibration gas. ( If the instrument span setting is changed, the instrument should be turned back to the standby position and the electronic zero should be readjusted, if necessary. ) 8. Place probe in the atmosphere to be monitored. If the needle moves to the upper limit of the scale, change the function switch to the next position. 9 . 2 Organic Vapor Analyzer 9 . 2 .1 Startup 1. Move PUMP switch to ON and check battery condition by moving the INSTR switch to BATT position. 2. Move INSTR switch to ON and allow five ( 5) minutes for warmup. 3. Set alarm level adjust knob on back of readout assembly to desired level . 4. Set CALIBRATE switch to X10 position, use CALIBRATE knob, and set meter to read O. 5. Move PUMP switch to ON position, then place instrument panel in vertical position and check sample flow rate indication. 6. Open the H2 tank valve and the H2 supply valve. 7 . Depress igniter button until burner lights . Do not depress igniter button for more than six ( 6) seconds . ( If burner does not ignite, let instrument run for several minutes and again attempt ignition. ) 8. Use CALIBRATE knob to "zero" out ambient background. For maximum sensitivity below 10 ppm, set CALIBRATE switch X1 and readjust zero on meter . To avoid false flame-out alarm indica- tion, set meter to 1 ppm with CALIBRATE knob and make differen- tial readings from there.