1. Equipment Specification: MICROWAVE DIGESTER, MICROPROCESSOR
CONTROLLED
Version 2 40.053-1/2
40.053 MICROWAVE DIGESTER,
MICROPROCESSOR CONTROLLED
Approval Date: January 2008 Version: 2
Purpose
Digestion and dissolution of water samples in a laboratory:
 to reduce interference by organic matter;
 to convert metal associated with organic matter and particulates to a form
(free metal) that can be determined by atomic absorption spectrometry or
other methods.
Conditions and Requirements
 The instrument shall be compatible with the climatic and other environmental
conditions of Indian laboratories.
Specifications
sample to be
digested
Aqueous samples containing dissolved and suspended
organic and inorganic materials
general Microprocessor controlled
Corrosion-resistant, well-ventilated microwave cavity
with exhaust fan
Oven interior cavity should be made up of
fluoropolymer or plastic-coated stainless steel
Rotating turntable with provision to hold 12 digestion
vessels
Foolproof safety system
power for digestion Microwave power: 1000W with programmable power
control
digestion vessels 12 digestion vessels made up of perfluoroalkoxy (PFA)
Teflon or equivalent material
Capacity: 100 ml or more
Capable of withstanding pressure of at least 76070
kPa )
Provision for controlled pressure relief
speed of turntable Minimum speed should be 3 rpm to ensure
homogeneous distribution of microwave radiation
system programming Adequate programme for following:
Microwave power
Pressure control system
Time at control pressure
Total run time
display High resolution LCD display screen

2. Equipment Specification: MICROWAVE DIGESTER, MICROPROCESSOR
CONTROLLED
Version 2 40.053-2/2
programme
information input
Alphanumeric keyboard for entry of operating
parameters and sample information.
internal self diagnose Provision for test system to perform and monitor:
 Turntable operation
 Status operation
 Exhaust system
 Door safety interlock
 Digestion vessel pressure
 Run time
 Door opening

power supply 220 VAC25%, 47 to 53 Hz.
corrosion protection All electronic devices should be protected against
corrosion.
Consumables and Spares
 Operation Manual
 Programming chart
 Digestion vessels, 12 numbers
 Washers for pressure lid for two years’ operation