Description and operation
SF
6
gas monitoring
L20--001EN/04
5/6
01--2003
E ALSTOM
Densimeter
Function
D Permanent SF
6
gas density monitoring.
D Visual SF
6
gas real pressure information (MPa -- psi).
Localization
The densimeter is situated onto the bottom of the pole of the circuit--breaker ,
and joined to the gas volume of the circuit--breaker .
Working
The densimeter is fitted with internal contacts. These contacts close succes-
sively if the gas’s density diminishes and determine 2 distinct thresholds.
These contacts are wired to the terminal block inside the cubicle and are usu-
ally left at the user’s disposal for the following use :
D Alarm pressure ”p
ae
” acts as a warning (topping up necessary).
D Minimum functional pressure for insulation ”p
me
” must be used either to
lock the circuit--breaker in position or to cause automatic opening. The option
is chosen by the client in keeping with operating requirements.
All the circuit--breaker’s rated performances are guaranteed up to the mini-
m um s pec if ied am bient t em per at ur e and t he m inim um f unc t ional
pressure for insulation ”p
me
”.
Continued on next page.
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