Hardware manual

Maintenance 4
Agilent 7500 Series ICP-MS Hardware Manual 4-15
Peristaltic Pump Tubing
When the peristaltic pump (peripump) no longer pumps the sample with an
even flow, wash or replace the pump tubing or readjust the pump clamps.
Change the peristaltic pump tubing in the following cases.
• When the tubing becomes too loose to uptake a solution.
• When the inside of the tubing is damaged and dregs are released.
• When it is impossible to remove sample memory.
This is especially important if you keep using old tubing. The inside tends to
come off and cause the nebulizer to become clogged. It is recommended to
replace the peristaltic pump tubing frequently.
There are three kinds of peristaltic pump tubing: (the colors of the tube
stoppers are indicated in parentheses)
• Sample tube: Tygon (white- black, 1.02mm i.d.)
• Internal standard tube: Tygon (orange- red, 0.19mm i.d.)
* Set the maximum number of pump revolutions for the internal standard
tube at 0.3 rps.
• Drain the tube: PharMed (yellow- blue, 1.52mm i.d.)
Cleaning the Peristaltic Pump Tubing
The peristaltic pump tubing has to be washed prior to use. The common way is
to soak it in a 5% Nitric Acid (v/v) solution for two or three days. If HCl is used,
Sn is eluted from the Tygon tube. In this block, 3% HCl (v/v) should be pumped
at 0.1 rps for an hour or less through the new peristaltic pump tube.
CAUTION
Some chemicals attack the peristaltic pump tubing. This might cause leakage in the
sample introduction and drain line, and cause corrosion of the sample introduction
system.
NOTE
An alternative way of washing is to pump a 5% Nitric Acid solution through the tubing at
0.1 rps after installation. In this block, do not use the peristaltic pump until no stains are
found inside the tubing.