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' Recovery of weighed amounts of halogenated hydrocarbons has been within 95-100 percent. ^^ metric flask. It is necessary to blow air through ty inlet of the absorber to remove liquid below the hitte^ glass. Wash absorber several times with disti!!*J Source-- Not commercially available. Contributed by: Dow Chem ical Company. Approximate cost--5200.00. water and make to volume. The sample can now`i* analyzed or transferred to separate sample bottles fa: later analysis. CGRHration Instructions Construction Dmtails Dr r . --~r- . Toinsure correct rates of air flow the flow meter should 1* Figure 1 is a drawing of the fritted glass absorocl used in-------petiodifijlly checked against a wet test meter. conjunction with the combustion apparatus. The apparatus was assembled as shown in Figure 2. Maintenance Instructions p rating Instructions 1. Prior to sampling, the furnace must be heated to about 900,,C Approximately twenty to thirty minutes is required for a warm-up period. 2. Connect the furnace to a sample point by means of a Saran line joined with rubber and glass joint connec tions. 3. Pipette 25 ml of trapping solution (1 percent sodium carbonate, 1 percent sodium formate solution) into the absorber. Turn the pump on and adjust the air flow rate (1.0 1pm proven efficient). The length of time of sampling will depend on the estimated concea- 1. Proper lubrication of pump should be maintained. 2. Fresh dessicant should be maintained in the dryin; tube. 1 3. Flow meter must be kept clean to insure accuntt readings. 4. Temperature of combustion furnace should be checked periodically. Bibliography i 5 j Determination of Chloride: A Modification of the Volhard MethoA Caldwell and Moyer. Ind. Eng. Chem. Anal. Ed. 7: 38 (1933). HALOGENATED HYDROCARBON ANALYZER Uses The halogenated hydrocarbon analyzer is used to record continuously in the parts per million range the concentration of halogenated hydrocarbon gases in the air throughout a plant. Operating Principle A continuous sample of air is drawn from each of twelve plant areas through Saran tubing and is metered through twelve rotameters located on the front panel The air is then passed through a furnace containing twelve quartz tubes operating at approximately 1000G The halogen in the presence of water vapor in the air is converted to the halogen acid. From here die acid is mixed with water through absorber tubes, the water being metered to each absorber by means of a rotating orifice operaring under a constant head tank. Two 6-record Foxboro Dynalog recorders are used to measure the resulting conductivity. Physical Description Weight-- Height-- Width-- Depth-- Measuring Unit Approx: 500 pounds 8 feet, 10 inches 2 feet 1 foot, 10 inches Panel Approx: 150 pounds 7V4 feet 2 feet 1 foot The sampling and measuring unit is designed for perma nent installation but the panel containing the two Dynalog recorders may be mounted remotely with respect to the (MSpi W" wii-uiw iwnJMimLi|!iiii 'i* >w*11 hw mMteem rtifii nn~irtfr wiffri'ft t* wh ucc 020373 Performance Data t This instrument has been used successfully over a period of time on methyl chloride, ethyl chloride, methyl bromide, carbon tetrachloride, vinyl chloride, and vinylidiene chloride. Its range is limited by the purity of water available, range of recorder, and CO, or other interfering gases present in air deemed as "zero." .. ^Range: ' . ;. Range limitations of this instrument have not fully been investigated. Air rates, water rate, recorder range and cell constants all may be varied, giving this instrument abundant flexibility. Extreme ranges have not been required in the Dow applications. Toxic limits have somewhat determined ranges of instruments now in use; i.e., vinyl chloride 0-1000 ppm; vinylidiene chloride 0-500 ppm; ethyl chloride 0-1000 ppm; carbon tetrachloride 0-300 ppm. Experimental units have been operated at both lower and higher ranges with excellent results and further investigation is in progress. The accuracy of all instruments now in operation is within 10 percent of analyzed gas samples. Source-- Not commercially available. Contributed by: Dow Chemical Company. oce 020374 Hgur* 3 -- Rop V7*w of A/tolyzor ShowJug MMuvfing Unit and Record*!* fon| (From Top of Photo), A- Meosvrmg Unit--0) Sample Unt Input* (12 in fhit Goto), 'A* Pipe* (2) Fumocoj (3) Quartz Tub** Passing Through Construction Details . Following are the essential components used in the con struction of this instrument: 12 points # Req'd. 1 1 1 1 1 1 24 12 4 1 4 6 6 12 1 2 6 points Req'd. 1 Heavy Duty Pyrometer 1 Heavy Duty Furnace 1 Heavy Duty tap changing transformer 1 Vacuum pump 1 Bodine motor 1 Constant level water chamber 12 Needle valves 6 Rotameters 4 Fittings (Crouse-Hinds) 1 Switch box Tygon tubing 2 Terminal strips Elbows 45 brass V4 inch Couplings brass Vfe inch 6 Quartz tubes 1 Steam condenser or ion exchange tower 1 Foxboro Dynaiog conductivity recorder Op rating and Malntananc* Instructions 1, Check pyrometer at top of front panel on measuring unit. This may vary from 1000C to 1090C. At no time should this temperature vary from these limits. a. If in excess of 1090C, adjust taps located on trans former. An adjustment decreasing the "fine" control 1 or 2 divisions shouid be sufficient. b. If less than 1000C, check furnace fuse. (Located on right facing rear of panel, in fuse box.) Check thermocouple, check taps on fumace and increase "fine" adjustment 1 or 2 divisions. 2. Check rotameters. Balls should ride with their bottoms . adjacent to top of marking tabs. Adjustments are made by needle valves on top header. Any oscillations may be damped by adjusting needle valves on water leg locate inside panel. Check to insure constriction is not tv* great so as not to allow the allotted quantity of water i? reach the cell. This may be done by removing rcta:Inarm and filling leg in question, replacing the arm an; : checking to see whether or not the water level decrease . Rotameters should be cleaned periodically when the cn,,' of sample tube is subjected to a dusty atmosphere <when dust or oil film accumulation is noticed in tube. 3. Remove rotating arm from water distributor and chsd ' flow. i 4. Check vacuum pump for oil level in trap on vacuum sid; of pump. This oil is used for lubrication. No fluid ; should be present in the trap on pressure side of pump. 5. Check absorption tubes and rubber tubing. 6. Check conductivity cells for bubble formation on plates. If present, partially remove cell allowing inrushing air to : remove bubbles. ? 7. Clean pens on recorder and replace ink padswhen 4 needed. i 8. When instrument has been shut down and is again to be put into operation, allow the water system to run 10 - minutes before starting pump so the water legs will be full. Also check the ball in the vacuum release valve to insure free operation. -7 9. In case of pump failureanda replacement pump is not : available immediately, voltage on fumace should be reduced by changing taps on transformer to lowest possible value to avoid operating the fumace at higher than rated capacity. Calibration Instructions Calibration is accomplished by contaminating a metered air stream with a known amount of material. This stream is sampled, analyzed by the instrument and at the same time checked against a standard. CARBON DIOXIDE INDICATORS Uses 1 . V. . Carbon dioxide indicators can be used to determine the concentration of CO, present in the atmosphere of a dosed space or compartment. Other uses include analysis of flue gases and combustion testing. Operating Principle A measured volume of air or flue gas under test is drawn into the absorption column by means of an aspirator bulb. Carbon dioxide in the sample is absorbed by a solution of potassium hydroxide contained in the absorption and manometer columns. The resulting reduction of gas pressure (the scale having been previously set to zero at the top of the liquid column) is an indication of the percentage of CO. present in the sample. Percent CO, is read directly from the scale. upon the various ranges. The model shown in Figure 1. ; for example, weighs 1 pound and is 2V4 by 114 by 9 inches high. All models are built of acrylic plastic construction employ* ing stainless steel for all metallic parts in contact with the fluid. The instruments are portable in design and provided with carrying cases and other accessories as needed to . operate in the field. Figure 2 is an enlarged drawing of the # 800-5 (0 to 5 ; percent) Carbon Dioxide Indicator showing the various components. * VCC i Performance Data 020375 * Various ranges and accuracy limits are available as fol lows. # 800-5 Carbon Dioxide Indicator, range 0-5 p;r` cent CO,, minor divisions 0.10 percent accuracy at full scale _