General Description

The filter inline with the dehumidifier is used to avoid to have dust and mucus entering the CO₂ sensor. The filter pad can be exchanged if required. It is delivered with five filter pads additional pads are deliverable in a set of five. 

Items this manual concerns:

• CO₂ inlet tube set for capnograph with filter and de-humidifier item 734553
• Low volume filter for HSE capnograph Type 340 item 734554

What you should have received:

• The filter body in two parts
• The body closing tube
• Filter pads (set of 5)
• The mounting tools

Assembling the Filter

Step 1 Disassembling the filter core and removing the filter pad

The filter is delivered assembled with a filter pad already installed. After having used the filter for a while the pad will get dirty or mucous has gotten to the filter and the pad requires replacing. Before installing the new pad you need to disassemble it. To do so, disconnect the filter rom the inlet tubing and remove the silicone tubing assembling the body.

Separate both body parts and remove the old filter pad.

Step 2 Install a new filter pad

A tool was supplied for installing a new pad as show here.

Prepare the pad and the tool

Introduce the pad into the tool sleeve using the rod

Put in place the filter body half, insert it into the sleeve

Push the pad into the filter body using the rod

Continue to push until the filter body with the pad installed comes out of the tool sleeve

Step 3 Reassembling the filter

The filter body half including the pad and the other half are reassembled using the silicone tubing delivered. Be sure both the filter body halves are mounted without any gap in between. That would create a dead space which could minimize your reading. 

Align the halves of the body

Press firmly together, there should be no gap

Retrieve the silicone tubing and slide over the new body assembly, taking are that they do not separate

The filter is ready to be installed in the input line of the capnograph

Step 4 Insert the filter into the Capnograph input line

The filter body filter is placed between the capnograph connection and the dehumidifier element. It should be placed close to the capnograph input connection.

The inlet tubing to the capnograph is a very narrow PE tubing, as it requires the dead volume to be as small as possible. The connection between filter and PE tubing must therefore be made meticulously. Short pieces of Tygon tubing are placed on the filter's metal ports and the PE tubing is inserted into the Tygon tubing and should be flush with the metal ports.

Cleaning the filter body

To clean the filter body we recommend to use a towel and soap water. The filter body is made of Plexiglass. Do not use any corrosive agents. We recommend to clean the connecting ports dental floss can be used.