Laboratory methods / Air Pollution Control District/County of Los Angeles.
- Los Angeles County (Calif.). Air Pollution Control District
- Date:
- 1958
Licence: Public Domain Mark
Credit: Laboratory methods / Air Pollution Control District/County of Los Angeles. Source: Wellcome Collection.
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![is changed. The length of any single shut-down may be computed from the run- ning time meter reading. The time that this occurred is shown by the clock. On-Off Switch. Located immediately below the clock. In the Off position it shuts down the entire machine except the clock. Hold Button. Located below the On-Off switch. This control can be used only when the Strip~Belt switch is in the Belt position. When the control switch is at the CO position andno belt is in the machine, the Hold button can be depressed to open the filter clamps. Reset Overload Relay. Located fo the right of the Hold button. Push the lever down to the bottom of the slot to reset. A short, low voltage, or any other ab- normal current condition will cause the lever to move upward in the slot and shut down the entire machine. Never iry fo force this lever upward. Control Timer. Located under the cover in the lower right of the control panel. This timer operates on a I-hour cycle. When first putting the Auto-Sampler into operation, it is usually desirable to start up on the hour. The timer must be set at - the beginning of acycleif a complete sample is to be collected on the first filter . Toreset the timer, remove the cover, grasp the edge of the cam between the thumb and fingerand move the front edge downward until the panel light goes out. The timer is now properly set. Do not attempt to move the front edge upward or the _ timer will be ruined. Replace the cover. Control Switch, Locatedin the center of the panel and has four positions: NO- normal operation, VO-vacuum off, CO-clamps open, and SO-sample out. This switch is for use in changing belts or rolls and making other inspections. The Au- to-Sampler will function normally only in the NO position. In the VO position the vacuum pump will be shut down, but the timer will continue to run. A 10- second pause should be made at this point before going to the CO position in order to allow the vacuum to fall. This prevents the filter from rupturing. In the CO position the vacuum will remain off and the filter clamps will remain open as long asa belt is in the machine or the Strip-Belt switch is set at Strip. If a belt is not in the machine and the Strip-Belt switch is at Belt, place the switch in the CO position and depress the Hold button. The clamps can then be held open unii! a new belt has been inserted. 1f the Strip-Belt switch is at Strip, the clamps will remain open when the conirol switch is at the CO position. in the SO position, the vacuum remains off, clamps open, and the belt will be run forward to the shut down position, if the Sirip-Belt switch is at Belt. By depressing the Hold button, the belt will be run completely out of the machine. If the Strip-Belt switch is at Strip and the control switch is at the SO position, the vacuum will remain off, clamps willremain open, and the roll] will be run completely out of the machine . The sample belt or roll may be moved forward one position ata time by switching from CO to SO momentarily and back to CO. ANALYTICAL: Photovolt reflectometer Mode! 610 (Figure 2), Sola constant-voltage transformer, No. 30805. APCD 3-54](https://iiif.wellcomecollection.org/image/b32169929_0031.jp2/full/800%2C/0/default.jpg)
