Servicing The Sba-5; Pump; Removing A Pump; Servicing A Rotary Vane Pump - PP Systems SBA-5 Manual

Servicing The SBA-5

Refer to Mounting the SBA-5
and zero valve.

Pump

The sampling pump provided by PP Systems is a "rotary vane" style pump and components wear
with prolonged use and material from the vanes may build up within the pumps. The risk of this
situation occurring can be minimized by regular pump servicing.
Typically, the following symptoms are attributed to a worn pump:
Noise – a worn pump usually sounds rough or vibrates.
1.
Temperature – the outer casing (near the pump serial number) feels warm compared to other
2.
pumps.

Removing a Pump

It is very easy to remove a pump for servicing. First, trace the electrical connection to the pump
and disconnect the 2-pin connector from the SBA-5 board (CN8 – PMP). Please note the
orientation of the red and black wire for correct re-fitting of the pump.
The pump itself is secured to the board by a pump mounting bracket. Use caution when
removing the pump from the bracket.

Servicing a Rotary Vane Pump

During prolonged operation, the vanes inside the pump will wear and deposit material inside the
pump. Therefore, it is highly recommended that you clean the pump by flushing it through with
isopropyl alcohol. The following procedure can be adopted:
1. Connect the pump to a 6-18V DC power source and fit a 30mm tube to the pump inlet.
(the SBA-5 can be used to supply power via the pump electrical connector).
It is, however, essential that the flushing is performed with the pump to the side of the
SBA-5 to avoid spillage onto the board.
2. Hold the pump above a beaker of isopropyl alcohol and dip the tube into the alcohol (see
below). Run the pump to draw alcohol through it. A small roll of cotton wool in the inlet pipe
can act as a filter for the re-circulating alcohol.
If the 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 required.
SBA-5 CO2 Analyzer Operation Manual – Version 1.06
Servicing The SBA-5
on page 13 for location of the pump (if applicable), infrared source
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