Revised Specification for Kjeldahl digestor and distillation system.docx

“ Automatic Kjeldahl Digestor and Distillation System” The system is comprised of three units of a modular configuration:

1. Automatic distillation and titration unit, with the following requirements:

a. Integrated colorimetric titration system

b. Ability to connect to an autosampler

c. Allows determination of ammoniacal nitrogen, protein determination, nitrogen content (Kjeldahl or direct alkaline distillation), using

d. Complies with the following standard methods for determination of nitrogen :

i. Nitrogen/Protein on Animal Feed: AOAC 984.13 method

ii. Nitrogen on Fertilizers: AOAC 920.03

iii. Nitrogen on Soil: Method of soil analysis part II method 33.4

iv. Nitrogen on Water: AOAC 973.48

e. Automatic addition of NaOH, H2O, and Boric Acid Titrant Solution

f. Selectable steam generation output level from 10-100%

g. Auto removal of resides from titrator and sample tube

h. Contains a digital display

i. Analysis time no more than 4 minutes (titration included)

j. Measuring range: 0.04 – 220 mg N

k. Reproducibility (standard deviation * 100 / Average) less than<1%

l. N Recovery: >99.5%

m. Detection Limit of 0.015mg N or better

n. Automatic cleaning of the titration vessel

o. Programs: Capability for > 20 custom programs

p. Connectivity: 2 x USB, Ethernet, RS232 (autosampler)

2. Autosampler for distillation and titration unit, with the following requirements:

a. Sample tubes are taken from carousel and fed directly into the automatic distillation and titration unit for processing

b. 24 position autosampler for 250mL tubes

c. Contains a digital display

d. Size of carousel tube holder: 100mL 250mL

e. No attendant needed

3. Automatic block digestor unit, with the following requirements

a. It is fully automatic with auto-lift of tubes

b. Aluminum heating block capable of reaching 420oC in 20 minutes and maintaining temperature with an accuracy of ± 0.5oC

c. Microprocessor controls the temperature of the block by safety thermostat

d. Heating Places: 42 20 positions for digestion tubes

e. Size of tubes: 100mL 250mL

f. Construction material: Stainless steel with chemical resistant coating

g. Temperature units: Digital Readout in oC

h. Temperature Calibration: Automatic

i. Program Library: > 20 user-programable memories

j. Temperature Ramping: at least 4 ramps per program

k. Time selection: 1 to 999 minutes (1 minute step)

l. Interface: USB

m. Contains visual and acoustic signals to alert the run is complete

n. Includes a recirculating vacuum pump for aspiring fumes coming from digestion and a scrubber for neutralization of corrosive fumes coming from the digestion

o. Includes (42) 250mL digestion tubes The Automatic Kjeldahl Digestor and Distillation System includes 2-year initial warranty, on-site installation and demonstration, and maintenance service is included during the first and second year.