BUCHI KjelSampler K-377 - Manual (Page 29)

3 Technical data
29 K-375/376/377 Operation Manual, Version B
3 .5 Reference substances
Table 3-18: Reference substances
Name Purity % N theoretical
(100 % purity)
Recommended
sample size
Recommended titrant concentration Digestion necessary
Ammonium
dihydrogen
phosphate 99.5 12.18 0.2 g c(H
2
SO
4
) = 0.1 mol/L No
Glycine 99.7 18.66 0.2 g c(H
2
SO
4
) = 0.1 mol/L Yes
Phenylalanine 99.0 8.47 0.3 g c(H
2
SO
4
) = 0.1 mol/L Yes
Ammonium
sulfate 99.5 21.21 0.2 g c(H
2
SO
4
) = 0.1 mol/L No
Tryptophan 99.0 13.72 0.2 g c(H
2
SO
4
) = 0.1 mol/L Yes
Acetanilide 99.0 10.36 0.2 g c(H
2
SO
4
) = 0.1 mol/L Yes
3 .6 Materials used
3 .6 .1 Titrator module and dosing unit
Table 3-19: Materials on the titrator
part Material designation
Housing sheet steel
NOTE
For the materials of the Dosing Unit, please refer to its manual which is delivered together with
dosing unit.
3 .6 .2 K-375
Table 3-20: Material on the K-375
Part Material Material code
Housing Polyurethane PUR/UL VO
Glass parts Borosilicate glass 3.3 DIN/ISO 3585
Insulation steam generator Ceramic fiber Multitherm 550
Steam generator housing Stainless steel 1.4301
Protective door Polymethyl methacrylate PMMA
Seal ring Chlorosulfonyl polyethylene elastomer CSM