A P10-gas cylinder (local) with double pressure reducer or a
central P10 gas supply can be used to flush and fill the detec-
tor. The P10 gas is a gas mixture consisting of 90% argon and
10% methane.
A pre-connected pressure regulator or a needle valve
should be used for the central gas supply. The maximum
flow rate should not exceed 100 cm³/min!
Gas is supplied and drained via 2 self-closing valves each at
the wall bracket and on the rear of the counter tube. Place the
hand-held probe into the wall bracket (see Figure 7.6) such that
the measuring area of the counter tube is facing you. Make sure
that the valves are pushed into each other (at the end you have
to overcome a slight resistance) until they fit together perfectly.
Thus, the valves will catch and open: P10 gas flows into the de-
tector and exits the counter tube again as soon as an adequate
overpressure has built up. The gas exits via a rotameter which
allows you to set the gas flow to an adequate rate (see Figure
7.7). The rotameter indicates a flow from 0 to 300 cm³/min on a
scale from 0 to 30 (multiplication factor 10). Do not use a higher
flow rate than 100 cm³/min to avoid damage to the window foil!
Figure 7.7: Function of the P10 gas refill station
The detector can be flushed or refilled in the idle position; no
extra flush-cycle is required when using it as a stationary in-
strument.
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