User Guide
Landcal Blackbody Source
Type P1600B2
Page 9
5 Commissioning
5.1 Inspection on Receipt
Check the contents against the packing note. Physically examine all items for
any damage that may have occurred during transit.
If any items have been damaged in transit, report this to the carrier and to the
supplier immediately, BUT DO NOT RETURN damaged items until the carrier
has considered a claim. Retain the packaging with the damaged article for
inspection by the carrier.
5.2 Furnace Assembly
The following paragraphs describe the step by step procedure to prepare the
furnace for use. See also Fig. 11.
To minimise the risk of damage to the furnace during transit, the target cavity
together with six silicon carbide heating elements are supplied separately. If
ordered, the measuring thermocouple(s) are also supplied separately.
To fit these items:
1) Unscrew the equally spaced self-tapping screws from the stainless steel
front plate. Remove the plate.
2) Unscrew a further set of equally spaced self-tapping screws and remove the
sighting tube assembly. The cavity support is clearly visible when looking
into the furnace.
3) The cavity can now be inserted. There are four grooves of different lengths
cast into the outside diameter of the cavity. In this particular source, only
one of the grooves is used. Other grooves are used when the same cavity
is used in other sources.
4) Insert the cavity so that the groove that finishes approximately half way
along the length is uppermost. Insert the cavity slowly. To keep the cavity
horizontal whilst it sliding into position, you can place a clean rod or tube
approximately 1.0 m / 39in long inside the cavity. When in the correct
position, the front edge of the cavity should be level with the step on the
insulation.
5) Remove the painted rear plate by unscrewing the 5 small equally-spaced
self-tapping screws. It is not necessary to unscrew the larger screws. A
stainless steel inner plate with thermocouple support tube is attached and
will come out with rear plate. This gains access to the element sleeves. An
earth strap is attached to this plate.
6) The elements can now be inserted. Carefully insert each element in turn
into the element sleeves, ensuring that they locate into the recesses at the
front. Extreme care should be taken not to strain the elements, as they
are very fragile. To avoid overheating of the element / braid connection, fit
two white insulation rings at the cold end of each element. The insulation
rings may be supplied in a separate container. The elements are not tight,
so expect a small gap to allow for differential expansion.
7) Attach the element connections as shown in Fig. 12.
