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0 !� -11- 5 . Remove inhalation valves . 6. Wash facepiece and breathing tube in cleaner/sanitizes powder mixed with warm water, preferably at 120140°F. Wash components separately from the facemask, as necessary. Remove heavy soil from surfaces with a hand brush. 7. Remove all parts from the wash water and rinse twice in clean warm water . 8. Air-dry parts in a designated clean area. 9. Wipe facepieces, valves, and seats with a damp lint-free cloth to remove any remaining soap or other foreign materials . 9 .0 Monitoring Equipment Instructions 9 . 1 HNU Photoionization Detector This instrument is intended to detect compounds with ionization potentials of less than 10 . 2 eV. Ionization potentials for spe- cific compounds are included under monitoring methods . 1. Before attaching the probe, check the function switch on the control panel to make sure it is in the off position. 2 . Attach the probe by plugging in the 12-pin plug to the inter- face on the readout module. 3. Turn the six-position function switch to the battery check position. The needle on the meter should read within or above the green battery arc on the scale. If not, recharge the bat- tery. If the red indicator comes on, the battery should be recharged. 4. Turn the function switch to any range setting . Look into the end of the probe briefly to see if the lamp is on. If it is on, it will give a purple glow. Do not stare into the probe for any length of time as UV light can damage your eyes . The instrument is now ready for operation. 5. To zero the instrument, turn the function switch to the standby position and rotate the zero potentiometer until the meter reads zero. Clockwise rotation of the span pot produces a downscale deflection while counterclockwise rotation yields an upscale deflection. Note: no zero gas is needed since this is an electronic zero adjustment . If the span adjustment setting is changed after the zero is set, the zero should be rechecked (and adjusted, if necessary) . Wait 15-20 seconds to ensure that the zero is stable. If necessary, readjust zero.