Humboldt HM-4100A User manual

10.22product manual
Slake Durability Apparatus,
120V 60Hz
HM-4100A

CONTENTS
Quick Start Guide
Introduction 4
Apparatus 4
Procedure 6

4
Introduction
The Slake Durability Index Test is intended to assess the
resistance offered by rock samples to weakening and
disintegration when subject to changes in water content.
Device an important part of tests to determine the weather-
ing properties of rock when exposed on embankments and
in open cast mining, as well as in many other applications.
Apparatus
The apparatus consists essentially of the following:
2.1 A pair of test drum assemblies manufactured in brass,
comprising a 2 mm standard mesh cylinder of unobstruct-
ed length 100 mm and diameter 140 mm with a solid xed
base. The other face of the drum is removable to facilitate
loading a sample for test.
2.2 A pair of transparent water tanks with suitably posi-
tioned horizontal axis drive shafts. The design is such that
drum assemblies can be easily tted to and removed from
the tank.
2.3 A motor assembly, including a drive shaft rotating at 20
rpm ± 1 rpm mounted on a base board capable of accepting
the standard pair of tank drum assemblies, automatically
inter-couple to form their own driving chain.
2.4 Electrical supply

5
Safety
Whilst the test is in operation do not remove any covers or
attempt to adjust any part of the machine.
Ensure all moving parts are thoroughly secured before
attempting any maintenance.
Electrical Safety
Warning: Before removing any covers or performing
maintenance repair and service, isolate from electrical supply
by removing mains plug. Where mains supply is required during
these activities, only competent persons should perform the
work.
It is advised that this machine be connected via a GFCI outlet
(not supplied), and it should operate if earth
leakage current exceeds 0.03 amps.
The power cable is coded as follows:
Note: exercise extreme caution when using the machine with
wet hands. Dry hands before operating machine.
Portable Appliance Tests (PAT)
This product has been tested for electrical safety prior to sale.
Organizations have an obligation to ensure equipment is
maintained and is safe for use. Regular PAT testing is one
means of ensuring equipment continues to be electrically safe.

6
Important: Do not connect PAT leads to sensitive components
such as PCBs, control switches and the like.
If in doubt as to the most suitable connection point contact
Humboldt Service Department for assistance.
3. Procedure
3.1 10 rock specimens each weighing 40 to 60 g, giving a total
weight of 450 to 550 g, are selected to represent the sample.
3.2 The selected specimens are placed in the drum and dried to
constant weight at a temperature of 105°C (this usually
requires 3 to 12 hours in an oven).
3.3 The drum assembly for each test is placed in the related
water tank and coupled in series to the motor drive unit.
Note: the drum assemblies are marked ‘left hand’ and ‘right
hand’ and should be placed accordingly, relative to the motor
drive unit.
3.4 The tank is lled with slaking uid to within 20 mm of the
drum axle (indicated by a mark on the tank). The test is immedi-
ately set in motion for a period of 10 minutes.
3.5 At the end of the period the drive is immediately switched
off, the drum assembly removed from the tank, and the assem-
bly with the specimens dried to constant weight at 105°C.

Humboldt Mfg. Co.
875 Tollgate Road
Elgin, Illinois 60123 U.S.A.
U.S.A. Toll Free: 1.800.544.7220
Voice: 1.708.456.6300
Fax: [phone]
Email: [e-mail]