CIRAS-3 Operation Manual V. 1.09 182 support@ppsystems.com
Run the pump to draw alcohol through it for a minute or so to ensure that any material is removed.
Please note that the pumps are not sealed, so it is normal to see alcohol leak through the sides of them
during this procedure. When finished, run the pump in air for at least 15 minutes to allow any residual
alcohol to evaporate. Ideally, let the pumps dry outside of the CIRAS-3 overnight. If the pumps are
reconnected prematurely, the absorber chemicals will be exhausted quicker than usual.
Re-connect the gas tubing to the pumps and secure in place inside the console using the pump bracket.
If the reference or analysis pump is seized, it may be freed by tapping it on the bench or by reversing the
voltage to run it backwards. If this does not work, pump replacement is usually required.
Air Sampling Pump (Thomas)
Air Sampling Pump (Schwarzer)
If you need to order a replacement pump please make sure that you are ordering the correct style as
highlighted earlier (See Air Sampling Pumps (Reference and Analysis) on page 180.
Air Supply Pump
The main air supply pump (ASU) is a “diaphragm” style pump and should not require replacement or
routine maintenance. It is located to the right of the reference air sampling pump and secured in place by
Velcro and tubing. The electrical connector is labeled ASU PUMP and can be removed by gently bending
back the connector lock and sliding out the connector. Please note the orientation of the electrical
connector for correct re-fitting of the pump. The pump itself is secured in position by Velcro and gas
tubing. These can be removed by gently pulling the pump from the rubber tubing and gently pulling back
on the Velcro.
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