The design of the "SMIDA" probably started at the same
time as the Willie (see the Willie page) was built. The
SMIDA is based on the chassis and parts of the breathing loop of a Russian IDA 71
which was purchased in the summer of
2002. The rebuild / modification was started during the autumn of 2002. The name SMIDA is
an acronym for Seippels Modified IDA. Some of the design ideas
are refined from Dave Suttons Franken rig found at www.nobubblediving.com
A Kiss style CCR is a manually flown mixed gas CCR that has a
small constant mass flow of oxygen added to the loop to increase the time
between manual gas additions.
The proud owner, designer, and manufacturer of the SMIDA is mr Peder Seippel,
a dedicated diver living in Stockholm, Sweden. He can be contacted at peder@seippel.nu.
Make sure you check out his page at www.seippel.nu.
 |
The unit with cover on, both the upper and lower housings
are repainted in a more visible (and good looking?) bright yellow colour.
Two 2.5 L steel cylinders with Poseidon valves are used to supply
diluent and oxygen to the SMIDA.
A bar protecting the valves and allowing the unit to be placed on the
end is to be added during the spring. |
 |
The original IDA harness is removed completely and a Dive Rite Transpac is used as
harness and secondary buoyancy control device. |
 |
Without the cover. Only one of the two canisters originally
used in the IDA has been kept. The plugged connectors for the second
canister are
visible above the left tank.
Two Draeger P-port are used to connect 1 + 2 oxygen sensors into the breathing
bag.
|
 |
The diluent is fed to the original demand valve. The valve
is modified with a press button a la Dave Sutton (see www.nobubblediving.com
again) to allow its use for manual bypass. The
original IDA over pressure valve is kept as well. |
 |
The oxygen sensors to be inserted into the P-ports are a
mixture of R22HO (can be purchased from www.oxycheq.com)
and PSR-11-75D (similar to the K1 but with longer life time, available
from RC Dive Technology www.oxygenanalyzer.com)
The primary readout will be one of Peders' PIC
processor designs for 2 oxygen sensors with auto calibration and audible alarms for high and low PO2. The secondary oxygen readout device houses an original Mk15
analogue volt meter purchased from Kevin Juergensen (www.electricfilm.com)
|
 |
The diluent gas block. In this version the diluent is used
for suit insufflation, wing supply as well as for an OC bailout demand valve. |
 |
The oxygen tank to the right with a non-ambient referenced
APEX DS4 feeding a KISS valve (see www.jetsam.ca).
The KISS is seen to the right lying on the floor, it combines a
constant mass flow (i.e. choked flow) orifice and a manual bypass valve.
The diluent tank to the left has a standard ambient referenced APEX
DS4.
|
 |
The two gas addition lines, the original stainless steel
tubes were cut and Swagelok fittings
(www.swagelok.com) were used to
connect fitting for ordinary dry-suit quick connectors.
The right line feeds oxygen
directly into the loop from the KISS valve assembly. The left one supplies the original
IDA demand valve with diluent.
|
 |
The unit is equipped with Draeger Ray hoses and DSV. |
|
|
the SMIDA in real life - TO BE ADDED (-: |