INSTRUCTION MANUAL FOR UNIPHOS PRECISION AIR SAMPLING PUMP MODEL:
ASP-40
The UNIPHOS precision gas detector consists of two parts viz. i) the gas detector tubes and ii) air
sampling pump (ASP-40). Together they form the UNIPHOS gas detection system. The air
sampling pump is used to draw a precisely defined volume of sample air through the detector tube
for determining the impurity gas concentration in the air sample. This manual describes the air
sampling pump and its operation for impurity gas measurement using detector tubes.
1. DESCRIPTION
ASP-40 is a piston and barrel air-sampling pump (Fig.-1). For measurement, a detector tube with
both ends cut is connected to the rubber tube connector at the end of the barrel. When the piston
is withdrawn by pulling the handle, sample air is drawn into the barrel through the detector tube.
Fig.-1 Uniphos Precision Air Sampling Pump (ASP-40)
Fig.-1 shows the different parts of the air-sampling pump, which are described in the following
section.
1.1
Tip cutter:
The tip cutter is provided on the pump to break off both ends of the detector tube before it is
inserted into the rubber tube connector for drawing the air sample. The broken tips are
collected into a storage space which when filled is to be emptied by pulling off the rubber cap
on the opposite side.