Labconco Hooded Combination Kjeldahl Systems User Manual

User’s Manual
Hooded Combination (Macro) Kjeldahl Systems
Models 21176 Series 21177 Series 21178 Series 21179 Series
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Labconco Corporation 8811 Prospect Avenue Kansas City, MO 64132-2696 800-821-5525, 816-333-8811 FAX 816-363-0130 E-MAIL labconco@labconco.com HOME PAGE www.labconco.com
Please read the User’s Manual before operating the equipment.
Copyright © 2009 Labconco Corporation. All rights reserved.
The information contained in this manual and the accompanying products are copyrighted and all rights reserved by Labconco Corporation. Labconco Corporation reserves the right to make periodic design changes without obligation to notify any person or entity of such change.
Warranty
Labconco provides a warranty on all parts and factory workmanship. The warranty includes areas of defective material and workmanship, provided such defect results from normal and proper use of the equipment.
The warranty for all Labconco products will expire one year from date of installation or two years from date of shipment from Labconco, whichever is sooner, except the following;
Purifier® Logic® Biological Safety Cabinets and PuriCare® Lab Animal Research Stations carry a three-year warranty from date of installation or four years from date of shipment from Labconco, whichever is sooner.
SteamScrubber® & FlaskScrubber® Glassware Washers carry a two-year warranty from date of installation or three years from date of shipment from Labconco, whichever is sooner.
Blood Drawing Chairs carry a ten year warranty.
Carts carry a lifetime warranty.
Glassware is not warranted from breakage when dropped or mishandled.
This limited warranty covers parts and labor, but not transportation and insurance charges. In the event of a warranty claim, contact Labconco Corporation or the dealer who sold you the product. If the cause is determined to be a manufacturing fault, the dealer or Labconco Corporation will repair or replace all defective parts to restore the unit to operation. Under no circumstances shall Labconco Corporation be liable for indirect, consequential, or special damages of any kind. This statement may be altered by a specific published amendment. No individual has authorization to alter the provisions of this warranty policy or its amendments. Lamps and filters are not covered by this warranty. Damage due to corrosion or accidental breakage is not covered.
Returned or Damaged Goods
Do not return goods without the prior authorization from Labconco. Unauthorized returns will not be accepted. If your shipment was damaged in transit, you must file a claim directly with the freight carrier. Labconco Corporation and its dealers are not responsible for shipping damages.
The United States Interstate Commerce Commission rules require that claims be filed with the delivery carrier within fifteen (15) days of delivery.
Limitation of Liability
The disposal and/or emission of substances used in connection with this equipment may be governed by various federal, state, or local regulations. All users of this equipment are required to become familiar with any regulations that apply in the user’s area concerning the dumping of waste materials in or upon water, land, or air and to comply with such regulations. Labconco Corporation is held harmless with respect to user’s compliance with such regulations.
Contacting Labconco Corporation
If you have questions that are not addressed in this manual, or if you need technical assistance, contact Labconco’s Customer Service Department or Labconco’s Product Service Department at 1-800-821­5525 or 1-816-333-8811, between the hours of 7:00 a.m. and 6:00 p.m., Central Standard Time.
Part #2081600, Rev. T
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CHAPTER 1: INTRODUCTION 1 Components Shipped 1 General Description 2 Performance 3 Component Identification 3
CHAPTER 2: INSTALLATION 6 General Installation Notes 6 Location 6 Bonnet Assembly 6 Sash Assembly 7 Electrical Connection 7 Hood Exhaust System 7 Hood Auxiliary System 7 Electrical 8 Tap Water Supply 9 Distillation Manifold 9 Water Aspirator Exhaust System 10 Acid Fume Blower Exhaust System 12 Blower Airflow Exhaust Volume Requirement & Velocity Test 12 Digestion Rack Drip Shield 13 Sash Installation 14 Glassware Installation 15
CHAPTER 3: NORMAL OPERATION & ROUTINE
Normal Operation Start-Up 16 Clean-Up and Cosmetic Guidelines 17 Fume Removal Manifold Suction Adjustment 17 Exhaust Systems Maintenance 17 Drip Shield 18
APPENDIX A: REPLACEMENT PARTS 19
APPENDIX B: DIMENSIONS & AIRFLOW REQUIREMENTS 21
APPENDIX C: TOTAL KJELDAHL NITROGEN METHOD 22
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MAINTENANCE 16
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Components Shipped
Carefully check the contents of your Hooded Combination Kjeldahl System for shipping damage while it is still on the shipping plate. Do not discard the packaging material until the contents have been checked and the equipment has been approved for installation.
The Hooded Combination Kjeldahl Nitrogen System has been shipped in one complete crate to minimize damage that may occur in transit.
The Hooded Combination Kjeldahl Nitrogen System as shipped has two components that must be assembled. The top exhaust bonnet component must be installed on the main body and the interior light must be electrically connected.
Make sure to inspect the product thoroughly prior to installation and report any damage that may have occurred in transit (see Warranty page for instructions).
Figure 1-1
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Chapter 1: Introduction
General Description
Labconco’s Hooded Combination (Macro) Kjeldahl Nitrogen System is designed to facilitate the determination of Total Nitrogen content within materials such as feeds, grains, soils, fertilizers, plant tissue, water, organic wastes, and food products. The expression Macro identifies the size of sample vessel and the sample size that can be used with this equipment. Other Kjeldahl systems are available, which use smaller sample vessels and require smaller sample sizes. The apparatus can be used for the digestion and/or distillation of all types of nitrogen containing samples. The system consists of the Lower Digestion rack and Upper Distillation rack. Both are used in standardized (Macro) Kjeldahl Nitrogen Determination Methods.
This Kjeldahl system is enclosed by a ventilated hood system which captures excess heat and provides for personnel safety during the digestion and distillation reactions. High temperature acid digestion and caustic distillation comprise the two-step Kjeldahl Nitrogen determination method.
2117703 Twelve Place Hooded Combination Macro-Kjeldahl System
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Chapter 1: Introduction
Performance
The Hooded Combination Kjeldahl Digestion and Distillation Systems have been designed for use in the determination of nitrogen (or ammonia) concentrations. By calculation nitrogen can be converted to protein values for products such as plant tissues, meats and other food substances. Nitrogen determinations with the Hooded Combination (Macro) Kjeldahl Systems can accommodate sample sizes up to 5 grams due to the size of the digestion/distillation flasks. However, higher levels of organic content within a specific sample type will require smaller sample sizes do to the vigorous digestion reaction. Detailed procedures developed by professional laboratory organizations such as American Association of Analytical Chemists, (AOAC) and American Association of Cereal Chemists (AACC) should always be consulted for step by step analytical procedures when operating this equipment. For methodology precision and accuracy please consult the specific published method for the type of sample or substance that will be analyzed.
Component Identification
1. Electric Heaters. 600-watt heaters are used in both the lower digestion and upper distillation rack of the unit. Infinite control switches regulate each of the heaters. The curved heater elements are provided and allow for the round base of the Kjeldahl Flasks, providing faster and more evenly distributed heat. The heating element assembly on the digestion rack can be moved closer to or away from the acid fume removal manifold to accommodate different size Kjeldahl flasks. All heaters and temperature controllers are wired to a common electrical box for connection to a facility electrical service.
2. Lower Fume Removal Manifold. Located in back of the digestion heater elements, this manifold is manufactured from chemical resistant chlorinated polyvinyl chloride and fitted with heat resistant Teflon® nipples designed to prevent leakage of the hot sulfuric acid fumes created during the digestion process. The nipple design, extends in to the flask opening, and efficiently removes excess acids fumes during the digestion process. The flasks are oriented at a 45 degree angle to the fume removal manifold to promote the condensation and refluxing of the acid fumes back down into the digestion flask. This refluxing process prevents the samples from boiling dry during the 45+ minute digestion process.
Component features #3 or #4 are selected by the customer when the
product is ordered. The Kjeldahl units described in this manual feature either the blower exhaust or water ejector exhaust system to remove the digestion fumes through the fume manifold system.
®
Teflon is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.
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Chapter 1: Introduction
3. Acid Fume Blower Exhaust System. Located on the left side of the unit, this blower removes excess sulfuric acid fumes from the digestion flasks. The blower is direct-drive with corrosion resistant impeller wheel. The blower draws the sulfuric acid fumes through the CPVC digestion manifold and discharges the fumes under positive pressure out through a duct work system connected to the buildings exterior. The 6" exhaust stack of the blower must be connected to a leak-tight PVC duct work system that vents 10 ft (3 meters) above the building roof.
4. Acid Fume Water Aspirator Exhaust System. A water aspirator fume removal system located on the left side of the digestion fume manifold is alternatively available on Kjeldahl systems. The water aspirator draws excess acid fumes by producing a vacuum in the digestion manifold and the flask nipples. The acid fumes are dissolved in the water and flushed to a 3-inch drain connection. The water ejector includes an air-vent pipe connection, which must to ducted to the roof of the building. The vent pipe prevents an air-lock from occurring within the water aspirator. The water aspirator requires a 3/4" NPT water connection with 60 psig and 6­8 gallons per minute flow rate in order to operate.
5. Temperature Gauge The condensation rack behind the upper distillation heating elements requires cooling water. The temperature of the distillation cooling water can be adjusted to promote condensation and suit individual requirements with the flow control valve handle, located below the distillation heaters. Water temperature is indicated on the thermometer, which is located at the water outlet of the distillation manifold. The water connections are 3/4" NPT and the supply line should be 1/2" minimum for proper water flow through the unit. For facilities where the ground water temperature exceeds 80°F (27°C), a recirculation water chiller system will be required to achieve sufficient condensation results.
6. Distillation Condensation Manifold Epoxy coated steel outer columns with stainless steel inner condensation columns provide long life. Each of the six column manifold features 3/4" NPT tap water inlet and outlets for easy plumbing connections.
7. Hood Exhaust Connection At the top of each Hooded Combination Kjeldahl System are two duct work connection collars. The exhaust collar is positioned to the right of the make-up air collar. The exhaust collar must be connected to a dedicated duct work system with a roof mounted blower. This exhaust connection will vent hot air and small amounts of acid fumes. If the Hooded Combination Kjeldahl System is furnished with an Acid Fume Blower Exhaust the two duct work system must not be connected together. Each duct work system must be routed to the building exterior independently. The make-up air collar can be connected to a duct work system which can supply up to 75% of the total exhaust air volume.
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Figure 1-2
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General Installation Notes
The Hooded Combination Macro-Kjeldahl System is shipped in two sections. The top exhaust bonnet and glass sashes will need to be installed after the main body has been installed in its final location. Exhaust duct work, electrical service, water supply and drain connections should be completed by a licensed contractor.
The customer will need to purchase their preferred size of Kjeldahl Flasks, with one-hole-rubber-stoppers and distillate receiving flasks. The glass Connecting Bulbs and Delivery Tubes are provided with each Kjeldahl System.
Connecting Bulbs and Delivery Tubes are included with Macro Kjeldahl Systems. For installation of the Connecting Bulbs and Delivery Tubes see section on Glassware Installation and Figure 2-9.
Use caution when you remove the protective packaging material taped to the heater runways as fragile components are involved. Levelers are shipped installed, as are the distillation cooling water thermometers.
Location
If possible, the apparatus should be uncrated in the room in which it is to be placed. Hooded Combination Macro-Kjeldahl Systems are heavy and can not be disassembled to reduce their overall size. Special arrangements should be made in advance for moving the systems to their final location within a facility. Special instruction tags are attached to the apparatus; they must not be removed until the installation has been completed.
Bonnet Assembly
The hood bonnet must be installed on top of the substructure of the hood. This is accomplished by elevating the bonnet up onto the top of the substructure. It is not required to bolt the bonnet in place, as its weight on the foam gasket seal will hold it in its proper place.
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