Document mq19ZXGxgv3bDRLdOoX0n8Xw0

* B.F.GOODRICH CHEMICAL COMPANY Inter-Organization Correspondence To J. R. Render Location Calvert City Date From April 28, 1975 W. C. O'Brien Subject Evaluation of the Photoionization Analyzer, Model PL 101 A portable photoionization analyzer, model PL 101, was obtained from the H*NU Systems, Inc. under a rental-purchase agreement. The instrument has been evaluated for approximately six weeks at the Calvert City plant by production, technical, safety, laboratory and process analyzer groups and all evaluations of the instrument were highly complimentary. ^ *' ^ The instrument is safe to use in Class X Group D Division II areas; it is --w rated intrinsically safe, but not explosion proof. The instrument is also sensitive to 0.1 ppm VC1 in the lowest level selection range and a very rapid response is obtained to changes in atmospheric levels of VC1. Although the present instrument does not have an illuminated dial for easier reading of results at night, and the probe cord should be lengthened, the instrument appears to be satisfactory to withstand the abuse of normal wear and tear received from our operators. It can also be UBed in the Calvert City vinyl areas under most operating conditions except for VC1 concentrations above the LEL and in a driving rain storm. The manufacturer states that a 10% error on the low side can be expected at 95% relative humidity and the error rises to approximately 50% at 100% relative humidity; however, at eleveated temperatures ( 60P) the error begins to decrease. An add-on probe heater can be used to eliminate this error, but I would question the intrinsic safety rating with the addition. In comparing the H*NU with the OVA, the H*NU has proven to be a better portable tool for the Calvert City Plant. Background readings with the OVA average from 7-10 ppm and concentrations below 10 ppm VC1 are not feasible to analyze whereas concentrations as low as 0.1 ppm VC1 can be detected with the H*NU. Also, the H'NU responds more rapidly to concentration changes and, therefore, is a better instrument for leak detection of VC1. In addition most of the chlorinated hydrocarbons and other hydrocarbons found in the vinyl areas do not cause the HNU instrument to respond and consequently the instrument is essentially considered specific to VC1 in a monomer plant, particularly since EDC is not an instrument interference. The OVA is bulkier, has to be main tained in the laboratory or an equivalent area where daily calibration, fuel replenishment, etc. can be accomplished; whereas the H'NU calibration Is more stable and the instrument relies only on a rechargeable' battery having to be periodically replenished and this can easily be dene in an operating area con trol room. Therefore, the H*NU instrument is much more readily available to operating personnel. Under normal operating conditions, the H*NU instrument in guaranteed by the manufacturer for one full year. From Calvert City's experience, we would not expect any unusual maintenance problems with the instrument. The light source as reported by the manufactuer can be expected to last in excess of 3000 operating hours. NGC 13347 2 The H*NU instrument has also been found to be a valuable leak detection tool in our Acrylic Acid Process building. There, minimizing benzene and ally! chloride atmospheric concentrations is very important. Attached is a manufacturers information sheet on the instrument response to other chemicals. The Calvert City Plant ordered the 3rd H*NU analyzer on 4/28/75. If others are bought anywhere in the Company within 90 days a 5% discount is available on the next 3 units, then 7^% on the following 3 units, 10% on the next 3 units and after that the discount is negotiable. Base price of the unit is $2950. cc: DBSchrock FRCarvell JJSchonaerts JWBloodworth RGMolloy WDRyan RLToole JAKlupar HWdltemate EBKatzenmeyer - Akron W. C. O'Brien NGC 13348 Photoionization Analyzer Model P1101 hnu systems inc. introduces a portable analyzer employ ing a new technique for the measurement of gases in industrial atmospheres. The instrument is similar to a flame ionization analyzer in its response to many organics but is safe because of the absence of a flame. The instru ment is sensitive and can detect less than 0.2ppm of many organics. Methane, however, gives no response. The instrument is lightweight, operates on rechargeable bat teries. has a minimal warm-up time, excellent stability, and requires no hydrogen or additional gases for operation. operating principle The process is termed photoionization since the absorption of ultraviolet light by a molecule leads to ionization via: R 4 hi> --R+ +-e where R+ is the ionized species and hP is a photon which has an energy > the ionization potential of the species. The sensor- consists of a sealed ultraviolet light source that emits photons which are energetic enough to ionize many trace species (particularly organics) but do not ionize the major components of air such as O2, N2, CO, COz, or H2O. A charrtber adjacent to the ultraviolet source con tains a pair of electrodes. When a positive potential is applied to one electrode, the field created drives any ions formed by absorption of the UV light to the collector elec trode where the current (proportional to concentration) is measured. Typical calibration curves are shown below: Class Selected List of Species Detected ' Species Methane Ethylene Acetylene Propylene 1-Butene Ailyl alcohol Hexane Photoioni2ation Response Yes No X X X X X X X Chlorinated Hydrocarbons Methyl chloride Carbon Tetrachloride Dichloroethane Vinylidene chloride Vinyl chloride Trichloroethylene X X X X X X Heterocyclics & Aromatics Pyridine Benzene Toluene Xylene Styrene Aniline X X X X X X Nitrogen Compounds Formamide Nitric Oxide Ammonia Methyl amine Ethyl amine Butyl amine Hydrogen cyanide Acetonitrile X X X X X X X X Sulfur Compounds Sulfur Dioxide Hydrogen sulfide Carbon disulfide Methyl mercaptan Dimethyl sulfide Dimethyl disulfide X X X X X X NGC Aldehydes & Ketones 13349 Formaldehyde Acetaldehyde Propionaldehyde Acrolein Crctonaldehyde Acetone Methyl ethyl ketone X X X X X X X advantages 1) simplicity of operation 2) response to a wide variety of organic and some inorganic compounds 3) no open flame 4) linear over 'V 3 decades 5) no additional gases needed for fuel 6) excellent long term lamp stability thereby reducing the need for frequent calibration 7) minimum hydrocarbon adsorption since the sensor is located at the sampling point 8) power is supplied toy readily available rechargeable bat teries 9} probe and accessories (battery charger, etc.) are stored in the instrument cover for better portability 10) adjustment of the wide range span potentiometer pro vides direct reading capability for a large number of gases applications industrial hygiene surveys to determine whether levels of toxic gases are in compliance with OSHA's (Occupational Safety and Health Administration) concentration limits (TLV'S). can also be used as a stationary area monitor for industrial atmospheres determination of organic solvent emissions from industrial processes provides safe leak detection measurements in refineries or other industries where explosion hazards can be a problem determination of the efficiency of a scrubber or an inciner ation process for compliance with Environmental Protec tion Agency (ERA), state, or local air pollution regulations determination of residual solvent vapors in food or chem ical processing specifications sensitivity: ranges: response time: operating time: packaging: size: weight: readout module front panel: meter: materials of construction: output signal available: standard accessories: better than 0.2ppm Benzene 0-20, 0-200, 0-2000 ppm less than 5 seconds minimum of 8 hours on 12V DC rechargeable batteries 2 separate units; sensor and readout connected by a three foot shielded multi-conduc tor cable with electrical con nector readout: B!4" long x 514" wide x 11" high sensor: 10" long and 2'A" maximum diameter readout: less than 8 pounds sensor: 20 ounces 6 position switch; pawer(off), battery check, standby, 0-2000, 0-200, 0-20 ranges, 10 turn counting span poten tiometer, and one turn zero potentiometer 4'A" meter readout: drawn aluminum case sensor: (outer body) alumin um, engineering thermoplas tic 0--10 MV recorder jacks a) AC battery charger b) probe: teflon lined tele scoping probe, three feet in length for sampling in accessible places PNC model PI 101 $2950 hnu systems inc. 41 Fair Oaks Drive Lexington, Massachusetts (617) 891-6881 02173 Form PI101/774 NOC 133 JO