Techne DB-3A - Manual (Page 20)

D B - 3 a n d D B - 3 A O P E R A T O R ’ S M A N U A L
P A G E 18
OPERATION
Preparation
1. Select the insert block(s) appropriate to the application. A list of
available blocks is given on page 22 of this manual. Ensure that both
the underside of the block(s) and the top of the hotplate are clean;
efficient heat conduction between these two surfaces is essential.
Top view showing three insert blocks in place
2. Place the aluminium alloy insert blocks into the well of the unit and
place the tubes containing the sample liquid in the blocks.
3. The heater design, temperature sensor and control circuit give good
temperature control and uniformity, but make sure that there is a
close fit of the tubes in the block to allow efficient heat transfer.
4. If less than the maximum number of insert blocks are fitted it is
recommended that you fit plastic half blocks to the space either side
of the aluminium block. The dummy blocks have the effect of
reducing heat losses, thus improving temperature stability.
5. Plug the mains cable into the socket in the rear of the unit. Connect
to the mains electricity supply with the plug provided or one wired
correctly for your supply. Switch the power ON from the switch
located next to the mains input lead. The mains indicator on the front
panel will light (as well as the fuse neon on the mains input unit).