Specac GS03940 Manual de usuario
Mini-Pellet Press
User Manual
2I-03940-6
Mini-Pellet Press
User Manual
2I-03940-6
User Manual
2
Mini-Pellet Press P/N GS03940
CONTENTS
1. INTRODUCTION ................................................................................. 3
2. CHECKLIST OF CONTENTS ................................................................. 4
3. OPERATION OF THE MINI-PELLET PRESS ........................................... 5
PREPARATION OF THE 7MM PELLET DIE ASSEMBLY ............................ 6
PRESSING THE 7MM PELLET DIE IN THE MINI-PELLET PRESS .............. 8
REMOVING THE 7MM PELLET DIE ASSEMBLY FROM THE MINI-PELLET
PRESS ........................................................................................... 10
POSITIONING THE KBR PELLET DIE RING HOLDER IN THE
SPECTROMETER ............................................................................. 11
CLEANING OF PELLET DIE PARTS AND KBR PELLET REMOVAL INTACT
FROM THE PELLET RING HOLDER ................................................... 12
4. SPARE PARTS FOR THE MINI-PELLET PRESS .................................... 14
5. LEGEND FOR THE MINI-PELLET PRESS ............................................. 15
© April 2016 Specac Ltd. All rights reserved.
Brilliant Spectroscopy™ is a trademark of Specac Ltd.
Other product names mentioned herein may be trademarks
of their respective owners.
Mini-Pellet Press
3
1. Introduction
Thank you for buying a product from Specac.
The Specac Mini-Pellet Press P/N GS03940 has been designed to
produce a maximum 2 tons load and when used with the 7mm Pellet
Die assembly P/N GS03950, provides a sufficient load for the
formation of excellent quality KBr pellets with a 7mm diameter, prior to
solid sample analysis by FTIR spectroscopy. The Mini-Pellet press and
7mm Pellet Die assembly items are an alternative to the use of,
typically, a 13mm diameter pellet die assembly within a 15 ton manual
hydraulic press to produce 13mm diameter KBr pellets/discs.
When the 7mm pellet die assembly with a KBr sample has been
placed in the Mini-Pellet Press, a 2 tons load can be easily and quickly
applied by turning of a pressure screw hand knob. This action
compresses a hydraulic fluid (oil) to raise a pressing piston and
compress a sample held in the pressing area. To assist in the turning
of the pressure screw knob an M8 (6mm A/F) size short handled Allen
key is included to fit the central socket screw for greater leverage if
required. To help in knowledge of the load being applied there is a
small pressure indicator gauge on the press body which shows the
actual pressure being applied and when to stop turning the hand knob.
The Mini-Pellet Press is small and relatively light enough in weight that
it could be held in the hand to turn the pressure screw knob if desired,
but for more secure use the press has been designed to sit and work
on a bench surface.
Warning: If you use the Mini-Pellet Press near the edge of a bench
surface to turn the pressure screw knob, be careful that as
much of the weight of the press as possible is on the bench
surface itself, to prevent the press from falling to the floor.
There is no requirement to permanently bolt the press to a work
surface to apply a load safely to a sample, thus enabling easy storage
of the press if needed.
User Manual
4
2. Checklist of Contents
Check that the following items have been supplied against P/N
GS03940:
Mini-Pellet Press
- P/N GS03940.
If a 7mm Pellet Die assembly P/N GS03950 has been ordered too
check that the following items have been included.
7mm Pellet Die assembly P/N GS03950
(including its own Pellet Ring Holder, Top
Anvil, Bottom Anvil and Perspex Extractor
Cap).
M8 Allen key for leadscrew and pressure knob handles.
Unpack the Mini-Pellet Press and die parts carefully (if ordered) and
prepare the items for use.
Mini-Pellet Press
5
3. Operation of the Mini-Pellet Press
Pressing a sample in the Mini-Pellet Press is simple and quick. Taking
the 7mm pellet die assembly (P/N GS03950) (1) as an example die to
use, it is easily located within the pressing area of the Mini-Pellet Press
(2). The lead screw assembly (3) is turned until hand tight to secure
the 7mm pellet die assembly (1) in position in readiness to turn the
pressure screw hand knob assembly (4). Only a light force is needed
to turn the pressure hand knob (4) to provide a sufficient tonnage load,
but the M8 Allen key provided can be used to turn the central socket
screw (5) for greater leverage if desired. The produced 7mm KBr pellet
is retained within the pellet die ring holder body (6) and this is
transferred to a 3” x 2” slide mount (7) to fit in the spectrometer. (See
Fig 1.)
Fig 1. Mini-Pellet Press and 7mm Pellet Die Assembly
1
2
3
4
5
User Manual
6
Preparation of the 7mm Pellet Die Assembly
Prior to placing the 7mm pellet die assembly (1) into the Mini-Pellet
Press pressing area (2), a potassium bromide (KBr) powder mixture
with a solid sample is prepared. A suitable quantity of the solid sample
with an amount of KBr powder (P/N GS03610) in the usual ratio of 1
part sample to 300 parts KBr can be ground together using the agate
pestle and mortar (P/N GS03600) or an automatic grinding mill such as
the Specamill (P/N GS06000) with an agate capsule set (P/N
GS06200).
The 7mm pellet die assembly complete (1) consists of a central pellet
ring holder (6), top anvil (8), a bottom anvil (9) and a clear Perspex
extractor ring cap (10). (See Fig 2.) The top anvil (8) has a longer
central “plunger” section than the bottom anvil (9).
Fig 2. 7mm Pellet Die Assembly Complete
When the sample has been ground sufficiently, place some of the KBr
mixture into the central hole of the 7mm pellet die ring holder (6) as it
rests on the bottom anvil (9). (see Fig 3.)
Fig 3. 7mm Pellet Die Ring Holder (Body) on Bottom Anvil
10
8
6
9
6
9
KBr powder sample
mixture placed here
Mini-Pellet Press
7
Fill the aperture hole of the 7mm pellet die ring holder (6) with sufficient
KBr powder mixture to reach the top. Using a flat blade or the edge of
the spatula, level off the powder mixture such the top of the powder
mixture in the hole is flush with the 7mm pellet die ring holder’s (6) top
surface.
Now, take the top anvil (8) and place it carefully (plunger face
downwards) over the powder/7mm pellet die ring holder (6)/bottom
anvil (9) assembly. Locate the central plunger section of the top anvil
(8) over the powder sample within the aperture hole and use light
pressure from your hand to compact the powder mixture into the hole.
The mixture is sufficiently soft to allow the plunger part of the top anvil
(8) to fit and locate loosely into place in the aperture hole of the 7mm
pellet die ring holder (6).. (See Fig 4.)
Fig 4. 7mm Pellet Die Assembly with Sample Prior to Pressing
When this stage has been reached you can carefully transfer this
complete 7mm pellet die assembly (with sample) into the Mini-Pellet
Press for full pressing of the KBr powder sample.
Note: The bottom anvil (9) has a recessed underside surface with a
metal rim around its circumference. The recess allows for central
and correct positioning of the 7mm pellet die assembly (1) over
the piston (11) of the Mini-Pellet Press prior to any pressing.
8
6
9
KBr powder mixture is
now partially compacted
within this assembly
User Manual
8
Pressing the 7mm Pellet Die in the Mini-Pellet Press
Prepare the Mini Pellet Press to accept the 7mm pellet assembly (1) as
formed at the stage shown to Fig 4.
The lead screw (3) on the Mini-Pellet Press is retracted (turned
anticlockwise) so there is sufficient “daylight” between the pressing
face of the leadscrew (12) and the piston (11) of the Mini-Pellet Press.
The piston (11) will be at its rest position for the start of its travel. This
will be when there is no applied pressure on the system from the
pressure hand knob (4) or shown at the pressure/load gauge (13).
(See Fig 5.)
Fig 5. Mini-Pellet Press Piston Area and Pressure Gauge Reading
Before Applying a Load
Before applying any pressure (load), to the die assembly (1) when it is
placed into the press, the pressure screw hand knob assembly (4)
13
3
12
11
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