.
.
‘
,.
.“ ,A—ç “
.
!
_
} …….…J,» {
72
'
-
_
‘
î _ equipmene
'
_
'
.
‘
_‘
—
should be virtuallÿ silent when the outlet pip‘e'is— covered to-Ïs'imulate
its_normal operating condition, and if the pump
is turnedur‘isidè
‘
down or rotated in
it should
quiet. Any
_
loüd fattles from inside indicate a burst diaphragm‘, faulty adju£stmeht
‘
or‘ incorrect initial assembly. Some aquarists like to switch their
-pump on and off by means of the thermostat, presumably for decor—
ative reasons as there is no other advantage, but this is not recommended for various reasons. First, injected air is ‘needed cohtin—
uouSly,“ especially in the case of sub—gravel ltration where aerobic
conditions must be maintained. Secondlÿ, because of the influence
of the coil in the pump, a heavy electrical spark is produced at the
thermostat points ”at the instant of switching,
damage
the thermostat unless is has sufciently large contacts. For those
determined to continue this practise, a càpacitor can be fitted across
the points to minimise the arcing, but it has the disadvantage that the
pump may still vibrate lightly while
switched off by the
“thermostat, and in this situation it is likely to siphon back as already
described above. Thirdly, with periodic operation the
not
experience constant environmental conditions, the inuence of
_
injected air being spread-over so many factors that articial changes
_
j
cause«dif‘culties. Some;aqüæist$'Switch off the pump at night
'and"this too is
the same reason. In addition, in
._
.…
planted 'aquaria, night-time
the airsupply is needed-most
_
because day—time
processes have” stopped and the
,
'
-plants
oxygen
“
-
Ï The efciency of the vibrator pump is highest when a back ’
pressu‘re' exists “onthe diaphragm‘i. and this is achieved
having
more air preSent
the system
the applianceS‘supplied
using. Piping systems should
of long loops,butshould-“be
and must be
piping itself
.
of the
possible
and any
be;
ca1r1ed oüt_before
pump in
to protect its
_
valvesThe pump itself VWill not contribute
Larg€rPumPSal”€ W%àblê Wh1€h €mp10YPlstonst0pr0duœ pres
_
surlsedalragam through an automaüc valve systemthewholear
rangementbangdrivenbyandectromagneüc
Vä1vesaren0tsesubJectt0d@gglngTheyarehowevefmoremE
mm -mï°îç '; m
iii;w …
J—Lâïä
î
.
‘
,.
.“ ,A—ç “
.
!
_
} …….…J,» {
72
'
-
_
‘
î _ equipmene
'
_
'
.
‘
_‘
—
should be virtuallÿ silent when the outlet pip‘e'is— covered to-Ïs'imulate
its_normal operating condition, and if the pump
is turnedur‘isidè
‘
down or rotated in
it should
quiet. Any
_
loüd fattles from inside indicate a burst diaphragm‘, faulty adju£stmeht
‘
or‘ incorrect initial assembly. Some aquarists like to switch their
-pump on and off by means of the thermostat, presumably for decor—
ative reasons as there is no other advantage, but this is not recommended for various reasons. First, injected air is ‘needed cohtin—
uouSly,“ especially in the case of sub—gravel ltration where aerobic
conditions must be maintained. Secondlÿ, because of the influence
of the coil in the pump, a heavy electrical spark is produced at the
thermostat points ”at the instant of switching,
damage
the thermostat unless is has sufciently large contacts. For those
determined to continue this practise, a càpacitor can be fitted across
the points to minimise the arcing, but it has the disadvantage that the
pump may still vibrate lightly while
switched off by the
“thermostat, and in this situation it is likely to siphon back as already
described above. Thirdly, with periodic operation the
not
experience constant environmental conditions, the inuence of
_
injected air being spread-over so many factors that articial changes
_
j
cause«dif‘culties. Some;aqüæist$'Switch off the pump at night
'and"this too is
the same reason. In addition, in
._
.…
planted 'aquaria, night-time
the airsupply is needed-most
_
because day—time
processes have” stopped and the
,
'
-plants
oxygen
“
-
Ï The efciency of the vibrator pump is highest when a back ’
pressu‘re' exists “onthe diaphragm‘i. and this is achieved
having
more air preSent
the system
the applianceS‘supplied
using. Piping systems should
of long loops,butshould-“be
and must be
piping itself
.
of the
possible
and any
be;
ca1r1ed oüt_before
pump in
to protect its
_
valvesThe pump itself VWill not contribute
Larg€rPumPSal”€ W%àblê Wh1€h €mp10YPlstonst0pr0duœ pres
_
surlsedalragam through an automaüc valve systemthewholear
rangementbangdrivenbyandectromagneüc
Vä1vesaren0tsesubJectt0d@gglngTheyarehowevefmoremE
mm -mï°îç '; m
iii;w …
J—Lâïä
î