The CMA 110 Liquid Switch permits manual switching between up to three perfusion lines and a microdialysis probe. This makes it possible to change different solutions instantaneously without any risk of introducing air bubbles into the microdialysis probe.

• CMA8308200 CMA 110 Liquid Switch with Tubing Kit

Technical Information

The CMA 110 Liquid Switch has been developed for use in conjunction with the CMA4004 Syringe Pump during microdialysis experiments. The use of the switch will enable selection between three different perfusion fluids without introducing air into the perfusion system.

The inlet side of the switch is equipped with three cannulae (Fig. 1); the outlet side with five (Fig. 2). Each of the three syringes in the pump should be connected to a cannula on the inlet side of the switch. The microdialysis probe or any other destination devise should be connected to the center cannula on the outlet side. The remaining four outlet cannulae should be connected to waste. Use the tubing kit delivered with the switch to make the necessary connections.

Switching is performed by using the knob. The position of the inlet and outlet cannulae are indicated by lining up the indication dots (Fig. 1). When the knob is turned, a resistance power is felt and as the switch moves into the correct position, the knob feels "loose." 

Fig. 3 is a schematic flow chart which indicates the passages through the switch that are open in the different positions.

Note: After use, all the passages in the switch should be rinsed thoroughly with distailled water. This should preferably be followed by drying gently with compressed air. If the switch is not properly rinsed, there is a risk that the passages will become blocked or the sealing surfaces damaged by salt crystals forming when the perfusion fluid evaporates.

Properly  maintained, the CMA 110 Liquid Switch will last for a long time. In case of malfunction please contact CMA microdialysis.