WIKA GTU-10 - Handbuch (Seite 12)

12 WIKA operating instructions portable SF
6
gas transfer unit, model GTU-10
14051107.01 06/2013 GB/D
GB
6. Commissioning, operation
Ensuring the gas quality
The system may only be operated with pure SF
6
gas. Contaminated SF
6
gas must be
cleaned with suitable pre-filters. The quality of the gas can be checked using a gas
analyser, e.g. GA11 SF
6
-Q-Analyser.
If the compressor is contaminated with decomposition products from SF
6
gas, proper
functioning can no longer be guaranteed.
Switch-off with gauge pressure > 40 bar abs.
Should a pressure of > 40 bar abs. be present at the outlet, the compressor will switch
off automatically. The cause could be a full cylinder or a closed valve on the gas cylinder.
The pressure at the outlet must drop below 40 bar abs. in order to be able to restart the
compressor.
Should the compressor not turn off automatically, a mechanical safety valve will open at
a pressure of 50 bar abs.. In this case, shut down the compressor immediately and send
it back to the manufacturer for inspection (see chapter 9.2 “Returns”).
The volume of the pressurised parts of the small-capacity compressor is 1.2 litres.
Due to the small volume and the low pressure, no environmental damage is produced.
With any heating up of the gas and the associated pressure rise, the over-pressure is
reduced via a safety valve.
On every GTU-10, prior to delivery, a pressure test with switch-off on over-pressure is
carried out.
OI_14051107_GTU-10_GB_D.indd 12 13.06.2013 11:28:13