Hach Digesdahl 23130-20 User manual

客服：400 688 9809
网址：www.mamots.com 电话：[phone]

23130-18
Digesdahl®Digestion
Apparatus
Models 23130-20, -21
Instrument Manual
© Hach Company, 1989-91, 1995-97, 1999. All rights reserved. Printed in the U.S.A. hm/ct 2/97 8 ed
aa/dk Rev. 2, 9/99
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

2
TRADEMARKS OF HACH COMPANY
AccuGrow®
AccuVac®
AccuVer™
Add-A-Test™
AgriTrak™
AluVer®
AmVer™
APA 6000™
AquaChek®
AquaTrend®
BariVer®
BODTrak™
BoroTrace™
BoroVer®
C. Moore Green™
CA 610™
CalVer®
ChromaVer®
ColorQuik®
CoolTrak®
CuVer®
CyaniVer®
Digesdahl®
DithiVer®
Dr. F. Fluent™
Dr. H.Tueau™
DR/Check™
EC 310™
FerroMo®
FerroVer®
FerroZine®
FilterTrak 660™
Formula 2533™
Formula 2589™
Gelex®
H2O University™
H2OU™
Hach Logo®
Hach One®
Hach Oval®
Hach.com™
HachLink™
HexaVer®
HgEx™
HydraVer®
ICE-PIC™
IncuTrol®
Just Add Water™
LeadTrak®
m-ColiBlue24®
ManVer®
MolyVer®
Mug-O-Meter®
NetSketcher™
NitraVer®
NitriVer®
NTrak®
OASIS™
On Site Analysis.
ResultsYou Can TrustSM
OptiQuant™
OriFlow™
OxyVer™
PathoScreen™
PbEx®
PermaChem®
Phillip D. Glass™
PhosVer®
Pocket Colorimeter™
Pocket Pal™
Pocket Turbidimeter™
Pond In Pillow™
PourRite™
PrepTab™
ProNetic™
Pump Colorimeter™
QuanTab®
Rapid Liquid™
RapidSilver™
Ratio™
RoVer®
™
Simply AccurateSM
SofChek™
SoilSys™
SP 510™
Spec ™
StablCal®
StannaVer®
SteriChek™
StillVer®
SulfaVer®
Surface Scatter®
TanniVer®
TenSette®
Test ‘N Tube™
TestYes!
TitraStir®
TitraVer®
ToxTrak™
UniVer®
VIScreen™
Voluette®
ZincoVer®
ZincoVer®
sension
√
SM
SINGLET™
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

iii
CERTIFICATION
Hach Company certifies this instrument was tested thoroughly, inspected
and found to meet its published specifications when it was shipped from
the factory.
The Digesdahl has been tested and is certified as indicated to the
following instrumentation standards.
Product Safety Per 73/23/EEC LVD: certified compliant by Hach Company to EN 61010-
1 (IEC1010-1), supporting test records by ETL. Listed by ETL to UL
3101-1 (Listing # H0492805390). Certified by CSA to CSA C22.2 No.
1010.1 (Certification # H0492805390).
Immunity EN 50082-1 (European Generic Immunity Standard) per 89/336/EEC
EMC: Supporting test records by Hach Company, certified compliance by
Hach Company.
Standards include:
EN 61000-4-2 “1995” (IEC 801-2) Electro-Static Discharge
EN 61000-4-4 “1995” (IEC 801-4) Electrical Fast Transients/Burst
EN 61000-4-5 “1995” (IEC 1000-4-5) Surge
EN 61000-4-11 “1994” (IEC 1000-4-11) Voltage Dips,
Interruptions and Variations
ENV 50140 “1993” (IEC 801-3) Radiated RF Electro-Magnetic Fields
ENV 50141 “1993” Conducted Disturbances Induced by RF Fields
ENV 50204 “1995” Radiated Electro-Magnetic Field from Digital
Telephones.
Emissions EN 50081-1 (Emissions) per 89/336/EEC EMC: Supporting test records
by TÜV Product Services and Hach Company, certified compliance by
Hach Company.
Standards include:
EN 55014 (CISPR 14) Emissions, Class B Limits
EN 60555-2 Harmonic Disturbances Caused by Electrical Equipment
EN 60555-3 Voltage Fluctuation (Flicker) Disturbances Caused by
Electrical Equipment
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

iv
Canadian Interference-Causing Equipment Regulation, IECS-003,
Class A:
Supporting test records by TÜV Product Services, certified compliance
by Hach Company.
This Class A digital apparatus meets all requirements of the Canadian
Interference- Causing Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du
Règlement sur le matériel brouilleur du Canada.
FCC Part 15, Class "A" Limits: Supporting test records by TÜV Product
Services, certified compliance by Hach Company.
(1) this device complies with Part 15 of the FCC Rules. Operation is
subject to the following two conditions:
(2) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may
cause undesired operation.
Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user's authority to operate the
equipment.
This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to Part 15 of the FCC Rules. These limits
are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is
likely to cause harmful interference, in which case the user will be
required to correct the interference at his own expense.
The following techniques of reducing the interference problems are
applied easily:
1. Disconnect power from the Digesdahl to verify that it is the source of
the interference.
2. If the Digesdahl is plugged into the same outlet as the device with
which it is interfering, try another outlet.
3. Move the Digesdahl away from the device receiving the interference.
4. Reposition the receiving antenna for the device receiving
the interference.
5. Try combinations of the above.
CERTIFICATION, continued
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

v
TABLE OF CONTENTS
CERTIFICATION .................................................................................................................... iii
SPECIFICATIONS..................................................................................................................vii
SAFETY PRECAUTIONS .................................................................................................... viii
OPERATION
SECTION 1 GENERAL DESCRIPTION ............................................................................ 3
1.1 Introduction......................................................................................................................... 3
1.2 Scope of Instructions........................................................................................................... 3
SECTION 2 PREPARATION FOR USE.............................................................................. 5
2.1 Unpacking ........................................................................................................................... 5
2.2 Assembly............................................................................................................................. 6
2.2.1 Heater Assembly........................................................................................................ 6
2.2.2 Fractionating Head System........................................................................................ 7
2.3 Selecting a Temperature Setting.......................................................................................... 9
SECTION 3 SAFETY & ENVIRONMENTAL CONSIDERATIONS............................. 11
3.1 Digesdahl Digestion Apparatus......................................................................................... 11
3.2 Using Hydrogen Peroxide................................................................................................. 12
3.3 Using Sulfuric Acid........................................................................................................... 14
3.4 Clean Up of Spills and Leaks............................................................................................ 14
3.5 Waste Management ........................................................................................................... 15
CONSIDERATIONS DE SECURITE ET D’ENVIRONNEMENT....................................... 16
3.6 Minéralisateur Digesdahl .................................................................................................. 16
3.7 Utilisation de l’eau oxygénée............................................................................................ 17
3.8 Utilisation de l’acide sulfurique........................................................................................ 19
3.9 Nettoyage des déversements et fuites................................................................................ 20
SECTION 4 OPERATION................................................................................................... 21
4.1 Apparatus Preparation....................................................................................................... 21
4.2 Digestion ........................................................................................................................... 21
4.2.1 Appropriate Sample Size......................................................................................... 22
4.2.2 Proper Digestion Solution Temperature .................................................................. 22
4.2.3 Sufficient Sulfuric Acid........................................................................................... 22
4.2.4 Carbonization Period............................................................................................... 24
4.2.5 Adequate Peroxide Concentration for Sufficient Time............................................ 24
4.2.6 Containment of Sample ........................................................................................... 25
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

vi
TABLE OF CONTENTS, continued
4.2.7 Sampling and Storage.............................................................................................. 25
4.2.8 Accuracy Check ...................................................................................................... 25
DIGESTION PROCEDURES
GENERAL DIGESDAHL DIGESTION............................................................................. 29
SAMPLE TYPE AND SIZE................................................................................................... 35
DIGESTION PROCEDURE FOR AQUEOUS LIQUIDS................................................. 39
DIGESTION PROCEDURE FOR OILS............................................................................. 53
DIGESTION PROCEDURE FOR SOLIDS ....................................................................... 67
MAINTENANCE
SECTION 5 MAINTENANCE............................................................................................ 81
5.1 Fuse Replacement............................................................................................................. 81
5.2 Kit Replacement Parts ...................................................................................................... 81
GENERAL INFORMATION
REPLACEMENT PARTS....................................................................................................... 85
HOW TO ORDER.................................................................................................................. 87
REPAIR SERVICE................................................................................................................. 88
WARRANTY.......................................................................................................................... 89
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

vii
SPECIFICATIONS
Temperature Range:
Variable from 100 to 480 °C (212 to 896 °F)
Temperature Control:
Within ±15 °C of set point*
Power Requirements:
115 and 230 Vac models, 50/60 Hz, 250 W** (use only single phase
for 230 V)
Aspirator Capacity:
11.5 L/min (3.0 gal/min) at water flow rate of 6.5 L/min (1.7 gal/min).
Minimum pressure 51.7 kPa (7.5 psi). Drain required.
Dimensions:
14 cm x 16.5 cm x 33.6 cm (5.5” x 6.5” x 13.25”).
Total height: approximately 61 cm (24”) when assembled for use.
Weight:
Net: 3.85 kg (8.5 lbs)
Shipping: 4.8 kg (10.6 lbs)
Operating Conditions:
15-35 °C (59-95 °F); 0-85% relative humidity
* The Digesdahl apparatus may be influenced by electric field radiation of 3 volts per meter or greater at
frequencies of 100 ±15 MHz and 180 ±15 MHz. The temperature specification of ±15 °C was not exceeded by
more than 10 °C at these radio frequencies.
** Use only single phase power for 230 V models. The over-temperature protection device may not interrupt power
when using poly-phase power.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

viii
Notice Before attempting to unpack, set up or operate this instrument, please read
this entire manual.
Pay particular attention to Section 3! Failure to do so could result in
serious injury to the operator or damage to the equipment.
The digestion procedures inthis manual involve the use of strong acid
and oxidizer at high temperatures. To avoid personal injury, observe
all warning messages.
Use of Danger Messages, Cautions and Notes
Danger messages, warnings, cautions and notes used in this manual have
the following significance:
DANGER
Indicates either a potentially or imminently hazardous situation which,
if not avoided, could result in death or serious injury.
CAUTION
Indicates either a potentially or imminently hazardous situation which,
if not avoided, could result in minor or moderate injury.
NOTE
Information that requires special emphasis.
Precautionary Labels
Please pay particular attention to labels and tags attached to the instrument.
Personal injury or damage to the instrument could occur if not observed.
This symbol, if noted on the instrument, references the Instruction
Manual for operational and/or safety information.
3.1 Digesdahl Digestion Apparatus
3.2 Using Hydrogen Peroxide
3.3 Using Sulfuric Acid
3.4 Clean Up of Spills and Leaks
4.2 Digestion
SAFETY PRECAUTIONS
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

1
OPERATION
DANGER
Handling chemical samples, standards, and reagents can be dangerous. Review the
necessary Material Safety Data Sheets and become familiar with all safety procedures
before handling any chemicals.
DANGER
La manipulation des échantillons chimiques, étalons et réactifs peut être dangereuse.
Lire les fiches de données de sécurité des produits nécessaires et se familiariser avec
toutes les procédures de sécurité avant de manipuler tout produit chimique.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

2
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

3
SECTION 1 GENERAL DESCRIPTION
1.1 IntroductionThe Hach Digesdahl Digestion Apparatus shown in Figure 1 is designed
to digest a wide variety of sample types for subsequent determination of
total Kjeldahl nitrogen, several minerals, and nutrients. Sample types
include food products, feeds, grains, wastewater sludges, plating baths,
plant tissues, fertilizers, beverages, and oils.
Digestion takes a fraction of the time required for traditional methods.
The digest is used with colorimetric, turbidimetric or titrimetric
procedures for final measurements. Digesdahl test results compare
favorably in accuracy and precision with those obtained by traditional
analytical methods.
DANGER
This product does not have thermal run-away protection when using
polyphase AC main power systems. Use this instrument only with single
phase 230 VAC systems.
DANGER
Ce produit n’a pas de protection contre la surchauffe lorqu’il est utilisé
sur une alimentation électrique en triphasé. Utiliser cet appareil
seulement sur alimentation 230 V monophasé.
1.2 Scope of Instructions
This manual is a guide and reference for safety recommendations,
assembly, general operation, replacement parts, service and warranty
information. Digestion procedures for the Digesdahl Digestion Apparatus
vary according to the type and form of the sample. Digestions for liquids,
oilsandsolidsarefoundinthismanual.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

4
Figure 1 Digesdahl Digestion Apparatus
CAPILLARY
FUNNEL
VENT TRAP
CAP
HEATER
ASSEMBLY
CAPILLARY
FUNNEL
ADAPTOR
POWER
SWITCH
TEMPERATURE
CONTROL
DIGESTION
FLASK
FLASK
WEIGHT
SAFETY
SHIELD
COLLUMN
BAFFLE
VENT TRAP
BODY
FRACTIONATING
COLUMN
COLUMN
RECEPTACLE
VERTICAL
SUPPORT
HEAT
SHIELD
TEMPERATURE
INDICATOR
MODE
SWITCH
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

5
SECTION 2 PREPARATION FOR USE
2.1 Unpacking Remove the Digesdahl Digestion Apparatus and accessories from the
shipping container and inspect each item for any damage that may have
occurred during shipping.
Verify that the following items are present:
•Heater Assembly, with power cord, fuse
•Vertical Support, shielded
•Column Receptacle
•Digestion Flasks (2)
•Flask Weight
•Heat Shield
•Aspirator
•Cooling Pad
•Finger Cots (2)
•Goggles, safety
•Instruction Manual
•Fractionating Head System parts:
•Fractionating Column, w/protector
•Capillary Funnel
•Capillary Funnel Adapter
•Vent Trap Body
•Vent Trap Cap
•Column Baffle Tubing, C-Flex, 6.25 feet
If any items are missing or damaged, please contact the Customer Service
Department, Hach Company, Loveland, Colorado (the toll-free number is
800-227-4224). For customers outside the U.S.A., contact the Hach office
or authorized distributor serving you. Please do not return the instrument
without prior authorization from Hach.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

6
2.2 Assembly
2.2.1 Heater Assembly
Assemble the heater assembly as shown in Figure 2.
Figure 2
Heater Assembly
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

7
2.2.2 Fractionating Head System
The fractionating head system is shown in Figure 3 and includes the
fractionating column, column baffle, the capillary funnel, and the exhaust
system components. Assemble as follows:
1. Place the fractionating column in the column receptacle (shown in
Figure 2) and place the column baffle in the top of the column with the
tapered end up.
2. Insert the capillary funnel adapter into the largest opening of the vent
trap body.
Note: The Hach Fume Scrubber Apparatus can be used in place of the aspirator.
Fumes are drawn into a chemical absorber module and absorbed by an activated
carbon filter. This filter is replaced when the absorbing capacity is exhausted. The
Fume Scrubber is designed for running up to six digestions simultaneously. .
3. Place the vent trap cap on the capillary funnel adapter .
4. Place the assembled capillary funnel adapter and vent trap parts on the
fractionating column.
5. Insert the capillary funnel stem into the hole in the vent trap cap.
6. Install the aspirator in a suitable water tap over a sink. Install the hose
barb fitting in the aspirator side port and install the extension tube.
DANGER
The Hach Fume Scrubber Apparatus can only be used with the
Digesdahl Digestion Apparatus for sulfuric acid digestions. Hazardous
conditions could develop iffumesfrom an alternate acid are vented with
the Fume Scrubber. It is important to clean the Fume Scrubber after
each use to prevent corrosion (see Operation section of Fume
Scrubber manual).
DANGER
L'épurateur de fumées Hach peut seulement être utilisé avec le
minéralisateur Digesdahl pour des minéralisarions à l'acide sulfurique.
Des conditions de risque peuvent être créées par l'aspiration de vapeurs
d'un autre acide dans l'épurateur de fumées. Il est important de
nettoyer l'épurateur de fumées après chaque utilisation pour éviter
la corrosion.
7. A 6.25-foot length of C-flex tubing is supplied with the aspirator. Cut
a segment approximately 16 inches long and connect the top stem of
the column receptacle to the vent trap body. Cut another segment from
the remaining tubing to connect the aspirator to the lower stem of the
column receptacle. This segment should be kept taut with no drape
that can collect condensate. The fractionating head system is now
assembled for use.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

8
Figure 3
Fractionating Column and
Exhaust Assembly
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

9
2.3 Selecting a Temperature Setting
Note: During a
digestion, the
temperature
reading will vary
slightlyaboveand
below the
selected
temperature. This
will not affect the
digestion or the
accuracy of the
final analysis.
When idling (no
digestion flask in
place), the
temperature may
fluctuate
± 15 ° C
from the set point.
The particular temperature applicable for the sample to be digested is
given in the appropriate analysis procedure manual. The steps below
explain how to set the heater temperature.
1. Connect the power cord to the line voltage receptacle and set the
POWER switch to ON. The TEMPERATURE indicator will light.
2. Set the Mode switch to SET. The TEMPERATURE indicator will
display the current temperature set point in degrees Celsius.
3. If a different temperature is desired, adjust the Temperature ADJ
control for the desired temperature in the digital display.
4. Set the Mode switch to READ and allow time (approximately
10 minutes) for the heater to reach the selected temperature. With the
Mode switch in the READ position, the temperature display shows the
current operating temperature.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

10
客服：400 688 9809
网址：www.mamots.com 电话：[phone]

11
SECTION 3 SAFETY & ENVIRONMENTAL
CONSIDERATIONS
Each person performing laboratory tests is responsible for safety. The
analyst should develop and practice good safety habits to minimize
chances for accidents by practicing good laboratory techniques.
3.1 Digesdahl Digestion Apparatus
For safe Digesdahl operation, observe the following precautions:
•Sample size -- Never digest a sample which contains over 0.5 g of
material which is not water.
•Oils and organic liquids should be considered as solids when
determining sample size.
•Acid type -- Only use acid specified in Hach step-by-step procedures.
•Acid volume -- Never use less than 3 mL.
•Always follow the order of steps indicated.
•If the sample goes to dryness, remove it from the heat immediately and
cool at room temperature. Never add hydrogen peroxide to a dry
sample flask; an explosion could occur. If you are not sure enough
sulfuric acid is present in the digestion flask, STOP. Do not add
hydrogen peroxide. Begin the digestion again with less sample or
more sulfuric acid.
•Be sure to keep the heat shield and the Digesdahl’s safety shield in
place during use.
•Always perform digestion behind a safety shield (Cat. No. 20974-00) or in
a closed fume hood.
•For respiratory protection, use a fume hood or Hach’s Fume Scrubber
Apparatus (Cat. No. 23266).
•Always wear safety glasses or goggles- be sure they have side shields.
•Wear protective gloves for during digestion procedures. Use tongs or
finger cots to transfer hot apparatus.
•Do not add alcohol, acetone or other organic solvents to the digestion
flask before or after digestion.
•During digestion, use the heat setting and digestion time specified in
the instructions. Do not leave the Digesdahl unattended during use.
客服：400 688 9809
网址：www.mamots.com 电话：[phone]