Labconco Open Combination Kjeldahl Systems User Manual
User’sManual
OpenCombination(Macro)
KjeldahlSystems
Models
21232Series
21233Series
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Labconco Corporation
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800-821-5525, 816-333-8811
FAX 816-363-0130
E-MAIL labconco@labconco.com
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Please read the User’s Manual before operating the equipment.
Copyright © 2010, 2013, 2014 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 #2081400, Rev. W
ECO H982
T
AABBLLEE
T
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
Electrical 7
Tap Water Supply 8
Distillation Manifold 8
Acid Fume Blower Exhaust System 9
Blower Airflow Exhaust Volume Requirement & Velocity Test 9
Digestion Rack Drip Shield 10
Glassware Installation 11
CHAPTER 3: NORMAL OPERATION & ROUTINE
Normal Operation Start-Up 12
Clean-Up and Cosmetic Guidelines 13
Fume Removal Manifold Suction Adjustment 13
Exhaust Systems Maintenance 13
Drip Shield 14
APPENDIX A: REPLACEMENT PARTS 15
APPENDIX B: DIMENSIONS & AIRFLOW REQUIREMENTS 16
APPENDIX C: TOTAL KJELDAHL NITROGEN METHOD 17
O
O
MAINTENANCE 12
FF
C
C
OONNTTEENNTTSS
CChhaapptteerr 11::
IInnttrroodduuccttiioonn
Components Shipped
Carefully check the contents of your Open Combination Kjeldahl System for
shipping damage while it is still on the shipping pallet. Do not discard the
packaging material until the contents have been checked and the equipment
has been approved for installation.
The Open Combination Kjeldahl Nitrogen System has been shipped in one
complete crate to minimize damage that may occur in transit.
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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1
Chapter 1: Introduction
General Description
Labconco’s Open 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 not enclosed, excess heat and personnel safety during
the digestion and distillation reactions should be considered when selecting
an installation location. High temperature acid digestion and caustic
distillation comprise the two-step Kjeldahl Nitrogen determination method.
2123202 Six Place Open Combination Macro-Kjeldahl System
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Chapter 1: Introduction
Performance
The Open 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 Open 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 due 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 PTFE nipples
designed to prevent leakage of the hot sulfuric acid fumes created during
the digestion process. The nipple design extends into 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.
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Chapter 1: Introduction
3. Acid Fume Piping Exhaust System. Located on the left side of the unit,
this exhaust piping removes excess sulfuric acid fumes from the digestion
flasks. Attention - The Exhaust Piping must be connected to a remote
blower to remove acid fumes. The unit does NOT have an integral
blower. The remote blower creates suction and draws acid fumes through
the CPVC digestion manifold and exhaust piping provided and pulls the
fumes under negative pressure out through a duct work system connected
to the remote blower and ultimately the building’s exterior. The 6"
exhaust stack on the left side of the unit must be connected to a leak-tight
PVC ductwork system that vents 10 ft (3 meters) above the building roof.
4. 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.
5. 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.
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