live.« If the knob or any surrounding insu—lation
will be extremely dangerous. —Most immerSible
n
designed to be used-in
and in
the action of gravity on the weight of the bi—metallic strip can fupset
Control.
-
.
-
_
‘
Externally fitted thermostats are probably the best for small and ‘_
,
medium sized containers, where the glass sides
not so thick as to
_
"
impair the thermostat’s sensitivity. They are mounted flat and must
be in contact with the surface of the glass over their whole fade.
‘
They are _not reliable on patterned or frosted glass Which is not flat
'
all over. Any clip used to hold the thermostat onto the aquarium must
”f
be non-toxic if it fits over the top lip of the aquarium and this method
,Ï
is useful if the thermostat might need to be remoVed temporarin
for some reason. Clipped—on therfnostats are, however, easily knocked
off,_which means that the heater Will then be permanently switched
.«Ï
,
On; The use of an adhesive allows greater exibility of positioning
‘ï
initially but is more permanent. There is some advantage in mounting
‘
the thermostat near the bottom of the container (but «not below the ‘
_
graVel Surface) in case it ”is only partially filled at any time. External
thermostats are safer electrically, and can usually carry more'cur—rént,
‘
but they must not be allowed to gather condensation or salt from
marine environments, and their performance can be affected by the
7
ambient air temperature if this varies greatly.Asæresult,they.…must
not be
draugh“Eÿ
ï;
-
'
,.
_
‘
There are some important general c0nsideräti0ns
all
-
of the way 'up the glass tube of the immersible typesand
…
'
above the top of external types, otherwise they may tend to respond
to theair temperature…above the water
than
water temperature itself. Where there is orilypone aquarium and no
«
the thermostat used must be thoroughly
It :Ç'annot be repeated iofter‘r enoughf“thät--external .therm05tats land
_
_,
the tops of imrersible ones must be kept—dryand—clean,everi*to€the _'
'
pdirit;of modifyirig covers andlightinghcäods to»
.
—
ÏÏf,
a
large aquarium
se‘veral“ aquariag, using morethan'0ne _'
Ü
are controlled by a single thermostat, the
-
‘
o_stai‘t; contacts muSt_gbe-gÏ«s;elected
sequent
1nformat10n15g1ven bythe manufacturers,and
”
lsquotedïfin
er
Small thermostat s.
lA contactsand
thesecarrÿ & maX1mum pracücalloadof . 200 Wat normal mains
'—
supplyvohage A SlmplecalculatwnconrmS= thlS ras follows
watts=ampsxvolts __
will be extremely dangerous. —Most immerSible
n
designed to be used-in
and in
the action of gravity on the weight of the bi—metallic strip can fupset
Control.
-
.
-
_
‘
Externally fitted thermostats are probably the best for small and ‘_
,
medium sized containers, where the glass sides
not so thick as to
_
"
impair the thermostat’s sensitivity. They are mounted flat and must
be in contact with the surface of the glass over their whole fade.
‘
They are _not reliable on patterned or frosted glass Which is not flat
'
all over. Any clip used to hold the thermostat onto the aquarium must
”f
be non-toxic if it fits over the top lip of the aquarium and this method
,Ï
is useful if the thermostat might need to be remoVed temporarin
for some reason. Clipped—on therfnostats are, however, easily knocked
off,_which means that the heater Will then be permanently switched
.«Ï
,
On; The use of an adhesive allows greater exibility of positioning
‘ï
initially but is more permanent. There is some advantage in mounting
‘
the thermostat near the bottom of the container (but «not below the ‘
_
graVel Surface) in case it ”is only partially filled at any time. External
thermostats are safer electrically, and can usually carry more'cur—rént,
‘
but they must not be allowed to gather condensation or salt from
marine environments, and their performance can be affected by the
7
ambient air temperature if this varies greatly.Asæresult,they.…must
not be
draugh“Eÿ
ï;
-
'
,.
_
‘
There are some important general c0nsideräti0ns
all
-
of the way 'up the glass tube of the immersible typesand
…
'
above the top of external types, otherwise they may tend to respond
to theair temperature…above the water
than
water temperature itself. Where there is orilypone aquarium and no
«
the thermostat used must be thoroughly
It :Ç'annot be repeated iofter‘r enoughf“thät--external .therm05tats land
_
_,
the tops of imrersible ones must be kept—dryand—clean,everi*to€the _'
'
pdirit;of modifyirig covers andlightinghcäods to»
.
—
ÏÏf,
a
large aquarium
se‘veral“ aquariag, using morethan'0ne _'
Ü
are controlled by a single thermostat, the
-
‘
o_stai‘t; contacts muSt_gbe-gÏ«s;elected
sequent
1nformat10n15g1ven bythe manufacturers,and
”
lsquotedïfin
er
Small thermostat s.
lA contactsand
thesecarrÿ & maX1mum pracücalloadof . 200 Wat normal mains
'—
supplyvohage A SlmplecalculatwnconrmS= thlS ras follows
watts=ampsxvolts __