Shielded Demagnetizer This
machine enables rocks to be demagnetized by
the alternating field method. The electronically-controlled
field has a peak value of up to 1000 gauss
(0. 1 T) at 180 Hz.
The rock sample (1 " [25.4mm dia.], up
to I " long) is held in a 2-axis tumbler.
The demagnetizer coil is shielded by a triple-walled
mumetal bucket shield. It consumes only 700
watts, so that it may be used in hotel rooms.
(Total weight: 50kg).
The PARM option:
A new Molspin device that can be added to
the shielded demagnetizer allows Partial Anhysteretic
Remanent Magnetization procedures to be performed.
The new device is attached to the Shielded
demagnetizer by way of a 5 way plug. All demagnetizers
supplied after 31 March 1996 have the 5 pin
socket installed. and so are "PARM"
ready. Older demagnetizers can be modified
to take the new socket.
The PARM device has two 10 turn potentiometers
fitted with counting dials. One of them defines
the field at which the PARM field will come
on, the other the field at which the PARM
field goes off. This flexible system allows
the place and range of the PARM field to be
set anywhere on the demagnetizing cycle.
High field shielded demagnetizer
A breakthrough in isolating the coil from
the magnetic shield together with extensive
re-design of the power supply and power amplifier
has allowed the maximum field to be increased
to at least 1500 Oersteds.
It has a cooling system and includes reversal
of the rotation as standard. The sample size
is unchanged at 2.54cm diameter and 2.54cm
long.
Although the appearance size is the same as
the original (which is still available) the
weight is greater. The P.A R.M and A.R.M attachments
remain the same.
