Membrane-Separated Electrode Method
Membrane-Separated
Electrode Method
MethodSensor: ES-K
Membrane-Separated
Electrode
Membrane-Separated
Electrode
MethodSensor:ES-K
Sensor:
ES-K
1.
Brief
description
1.
Brief
description
Sensor: ES-K

Based
on
principles
Basedon thetheprinciples ofof thethe potentiostatic
potentiostatic electrolysis-based
electrolysis-based sensor,
sensor, this
this sensor
sensor is
is
1.
Brief
description
1.
Brief description
structured
withstructured
with aa gas-permeable
gas-permeable film
film (separating(separating membrane)
membrane) andand anan actionaction electrodeelectrode1.
Brief
description
Basedon theprinciplesfromof thepotentiostatic
sensor,this sensor
iscompletely
separatedeachother. It is aelectrolysis-based
toxic gas sensor withan excellent
selectivity.

completely
eachother. It is aelectrolysis-based
toxic gas sensor withan excellent
selectivity.
Basedon theseparated
principlesfromof thepotentiostatic
sensor,this sensor
isstructured
with a gas-permeablefilm (separating
membrane) andan action
electrodeBasedon theof the potentiostatic
electrolysis-based
sensor,this sensor
isstructured
withprinciples
a gas-permeablefilm (separating
membrane) andan action
electrodecompletely
separatedfrom
eachother.
It
is
a
toxic
gas
sensor
with
anexcellent
selectivity.
structured
witha gas-permeablefilm (separating
electrode2.
andprinciples
completely
separatedfromeach other.
It is a toxicmembrane)gas sensorandwithananaction
excellent
selectivity.
2. Structure
Structureandprinciples
completely separated from each other. It is a toxic gas sensor with an excellent selectivity.

[Structure][Structure]2.
Structure and principles
2.
andwithprinciples
The
sensoran
TheStructure
sensor is
is structured
structured
withan actionaction electrode—aelectrode—a metal
metal electrodeelectrode2.
Structureandprinciples
withagas-permeable
film[Structure]with a gas-permeable film placed
placed over
over it—along
it—along with
with reference
reference andand[Structure]counter
electrodes;
theseelectrodes
housedplastic
containerThe
sensoris structured
withan actionare
electrode—aelectrodecounter
electrodes;
theseelectrodesarehoused inin aametal
plastic
container[Structure]The
is electrolytic
structured withan action
electrode—aelectrodefilledsensor
with ansolution.
Betweenthe actionmetalelectrodeand the[Structure][Structure][Structure][Structure][Structure]

Stationary
Stationary sensor
sensorExample:Example: ES-K2
ES-K2 series
seriesStationary sensor
Stationary
sensorExample: ES-K2 series
Stationary
sensorExample:ES-K2
seriesExample:ES-K2
seriesCategory
Detectable
Category
Detectable gas
gas
Electrochemical
Electrochemical
Category
Category
Category
Electrochemical
Electrochemical
Electrochemical

Toxic
Toxic gas
Detectable
Detectable gas
Detectable
Toxic gas
Toxic
Toxic

Gas-permeable
Gas-permeable film
filmElectrolytic
Electrolytic
solutionsolution

Gas
Gas release
releaseGas-permeable film
Gas-permeable film
GasreleaseGas-permeable
film
Gas releaseGas release
Detectable
Detectable gas
gas

with
a withgas-permeablefilmsolution.
placed over
it—alongwith referenceandElectrolytic
filledsensor
anelectrolytic
Betweenthe action
electrodeand theThe
is thinstructured
withan action
electrode—ametalelectrodewithaisgas-permeable
film
placedoverareit—along
andElectrolytic
filmaaelectrodes;
very
layer
of
an
electrolytic
solution.
solutioncountertheseelectrodes
housedwith
in areference
plastic container
film
is
very
thin
layer
of
an
electrolytic
solution.
witha gas-permeablefilm electrodes
placed overare
it—along
withandElectrolytic
solutioncounter
electrodes;
thesehousedin areference
plastic
container
filledwithanelectrolytic
solution.
Betweentheactionelectrodeandthe[Principles][Principles]
solutioncounter
electrodes;
thesesolution.
electrodes
are housed
in a electrodeplastic container
filledan electrolytic
Betweenthe action
and thefilm
iswitha very
thin
layer
of an
electrolytic
solution.
A
gas
passesthrough
the
film
with
A detectabledetectablegaslayerpassesthrough
the gas-permeable
gas-permeablefilm andand reacts
reactswithfilledan electrolytic
Betweenthe action electrodeand thefilm
iswitha verythin
ofsolution.
anelectrolytic
solution.
ions
solution,
which[Principles]
Gas-permeable
ionsisinintheelectrolytic
solution,
which produces
produces
halogen. IfIf the
the
film
a the
veryelectrolytic
thin layer ofan electrolytic
solution. halogen.
Gas-permeable Electrolytic
Electrolytic[Principles]film
solutionCl
following
reaction
occurs:
Detectable gas
Adetectabledetectablegas
gasis
passesthroughthegas-permeablefilm
andreactswith
2,, thefilm
solution
detectable
gas
is
Cl
the
following
reaction
occurs:2[Principles]
Detectable gas
Adetectablegas
passesthroughthegas-permeablefilm
andreacts
with
Cl
2I
2Cl
II2produces halogen. If the- ->-+ions in the electrolytic
solution,which
2 +Gas-permeable
Electrolytic
Cl
+
2I
->
2Cl
+
2
2
DetectablegasA
detectablegas
passesthroughthegas-permeablefilm
andreactswithionsinelectrolytic
solution,which
produces
halogen.
If theGas-permeable
Electrolytic
The
II2 thegeneratedbyreactionisreducedatthefilm
solution
detectable
gas is Cl
thefollowing
occurs:Theingeneratedby2,thisthisreaction
isreaction
reducedat halogen.
the action
actionIfelectrode,electrode,
2 the
ions
electrolytic
solution,which
producestheGas-permeable
Electrolytic
film
solution
detectable
gas
is
Cl
,
the
following
reaction
occurs:2 passcausing
current
through
Since
Clto
2I- ->
2Cl +theI2 circuit.
causing aa gas
current
throughthecircuit.
Since this
this current
current isis
2 ,+passfilm
solution
detectable
is Cl
Clto
following
occurs:2Iconcentration,-> 2Cl- is+reaction
I2 the sensor
2 +theproportional
totheActionThe
I2 generated
by2gasthisat themeasures
action electrode,
Counter
proportional
to thethegasconcentration,
the sensor
measuresthe current
current-reaction- + reduced
ActionCounter
Reference
Cl
+
2I
->
2Cl
I
The
I
generatedbythisreactionisreducedattheactionelectrode,2the2Referenceelectrode
2
value
to
determinegas
concentration.
Detectablegas
reactswiththeelectrodecausing
adetermine
current to thepassthroughthe circuit.
Since thisgas
current
is with theelectrodeelectrode
value
to
gas
concentration.
Detectable
reactselectrodeelectrode
The
I
generatedbythisreactionisreducedattheactionelectrode,causingacurrent
topassthroughthecircuit.
Since
thiscurrent
is2
electrolytic
solution
beforeitit reacts
withactionelectrodeandproportional
to the gas
concentration,thethesensormeasuresthecurrent
Actionelectrolytic
solution
beforereactstheactionelectrodeandCounter
circuitcausinga current
passthroughthewithcircuit.
Since
thiscurrentis
Reference
proportional
tointerference
thetogasthesensormeasuresthecurrent
Potentiostatic
circuitAction Potentiostatic
Counter
therefore
no
with
gases
that
do
not
react
with
the
electrodethevalue
to determine
the concentration,
gasoccurs
concentration.
Detectablegas
reactswithelectrode
thereforenointerference
occurs
with
gases
that
do
not
react
with
the
Referenceelectrode
proportional
to
the
gas
concentration,
thesensormeasuresthecurrent
Actionelectrodevalue
todeterminethegasconcentration.
Detectablegas
reacts
with
theCounter
electrodeelectrodeelectrolytic
solution;
thisprovidessensor
with
excellent
selectivity.
electrolytic
solution
beforeit reactsthe
withthe action
electrodeandReferenceelectrolytic
solution;
thisprovidesthesensorwith ananexcellentelectrode Potentiostaticvalue
to determine
thegas
gas reactsselectivity.
with thecircuitelectrodeelectrolytic
beforeitconcentration.
reactswith
theDetectableactionelectrode
Enlarged
therefore nosolution
interference
occurswith
gases
that doelectrodenot reactand
with theEnlarged view
view
Potentiostatic circuit
electrolytic
solution
beforeitreactswiththeactionelectrodeandthereforenointerference
occurs
with
gases
that
do
not
react
with
the
electrolytic solution; this provides the sensor with an excellent selectivity.
Potentiostatic circuit
therefore
interference
occurs withreact withtheelectrolyticnosolution;
this provides
the gases
sensorthat
withdoannot
excellent
selectivity.
Enlarged viewelectrolytic solution; this provides the sensor with an excellent selectivity.
Enlarged viewto the current○proportional
Output characteristics
The
gasTheconcentrationis thevalue.
sensoroutputs○
Outputcharacteristics
value.
The
sensoroutputs
The gas concentrationis theSensoroutputoutput
SensoroutputSensorSensoroutputSensoroutput3.
example)Enlargedview
3. Features
Features (of(of thethe sensor
sensor ES-K233
ES-K233 (Cl(Cl22 sensor)
sensor) asas anan
example)○Agingcharacteristics○ Aging characteristics○
Outputcharacteristics○ Outputcharacteristics
3.
Features(of the sensor ES-K233(Cl2 sensor)The
assensoran example)
does
sensordoes notnot degradedegrade inin performance
performance over
over
1.5
3.
Features(of thesensor ES-K233(Cl2 sensor)○Theasan characteristics
example)The
gas
concentration
is
1.5
The
gas
concentration
is
Aging
time
with
almostnochangesinoutput.
If,
however,the3.
Features(ofthesensor
ES-K233(Cl
2 sensor)asanexample)time
withalmostnochangesinoutput.
If,
however,the○proportional
Outputcharacteristics○ Aging characteristics
to the current
The
sensordoesfilm
notisdegradein performanceovergas-permeable
degradedin○
Agingcharacteristics
gas-permeable
degradedin gasgas permeability
permeability
The
sensordoesfilm
not isdegradein performance
over

1.5
1.5
1.5

Reading
Reading
Reading
Reading
Reading

OutputOutput
ratio
Outputratio
ratio
Outputratio
Output
ratio

time
with
almostnochangesin output.
If, however,
the
due
to
matteradhering
to
may
lead
to
The
doesnonotchanges
degradeperformanceoverduesensor
to aa foreignforeignmatteradhering
to it,
it, thisthismayleadthetoproportional
towithoutthe current
time
with
almostininoutput.
If, however,currentanyThe
gas value
concentrationiscurrent
value
any
gas-permeablefilm
is degradedin gas If,
permeability
proportional
to without
the current
reducedoutput.
time
withalmostnochangesinoutput.
however,thereducedoutput.
value.
The
sensoroutputs
thegas-permeablefilm
isdegradedingaspermeabilitychangeandthegas
proportionaltothecurrentchangeandthe gasdue
to a foreign matter
adhering togas
it, this
may lead tovalue.
The
sensoroutputs the(μA)
gas-permeable
is degraded
permeability○
and(μA) 0current
value
withoutanydue
to a foreignfilm
matteradhering in
to it, thismay lead toconcentrationis,○ Temperature
Temperature
andvalue.
The
sensoroutputs0
concentrationis, therefore,
therefore,
reducedoutput.
current
value
without
any the0
1.5
due
to a foreign
matter adhering to it, this may lead tochangeand thegassensor
humidity
characteristics
0 Concentration 1.5
reducedoutput.
proportional
tothehumidity
characteristics
current
value
without
any
proportional
totheConcentration
changeand thegassensor
(μA)
○High
Temperature
reducedoutput. and0(ppm)
concentrationis,therefore,
temperatures
have
output.
(μA)
(ppm)
High
temperatures
have almost
almostchange○ Temperature andoutput. and the00
concentrationis,gastherefore,
1.5(μA)
humidity
characteristics
proportional tois,thesensornoeffectontheoutputwhile○
Temperature
andConcentration 1.5
Humidity00noeffectontheoutputwhile
lowconcentration
therefore,
humidity characteristics low
Humidity (%RH)(%RH)
proportional
to the sensor
Concentration
0.8
(ppm)
○
ResponsivenessHightemperatures
havetoalmostoutput.
000
1.5
temperaturesarelikelyreduce9050
0.8 Concentration○
Responsivenesshumidity
characteristics
temperaturesarelikelytoreduce90
proportional
tothesensor
50
(ppm)
High
temperatures
have
almostoutput.
noeffectontheoutput
while
low
The
sensorresponds
quickly.
theoutput.
Even
at
0℃,
the
Humidity(%RH)
The
sensorresponds
quickly.
(ppm)
Hightemperatures
have
almosttheeffect
output.
Even
at 0℃,
thelow
output.
noontheoutputwhile
0.8○SinceResponsiveness0 Humidity
temperatures
are likely
to reducethe50(%RH) 90
sensorits
Humidity
the electrodes
electrodes orornoeffectmaintains
on thewhile
lowat
sensormaintains
its sensitivity
sensitivity
at
0.8○SinceResponsiveness
Humidity
0 Humidity
temperatures
areoutput
likelyto reduce50(%RH) 90
100
The
sensorresponds
quickly.
100
electrolytic
solutionisrarelytheoutput.
Even
at
0℃,
the
a
level
not
lower
than
80%.
By
0.8
○
Responsivenesselectrolytic
solution isquickly.
rarely0temperatures
are atlikelytothe
reduce9050
a level
not lower
than
80%.
By
(ppm)
The
sensor responds
theoutput.
Even
0℃,
(ppm)
Temperature
Since
the electrodesorsensormaintains
its0℃,
sensitivity
at (%)
sensorcorrodedbyCI
Temperature
performing
temperature
Humidity(%)
The
sensorquickly.
the orsensorcorrodedbyresponds
CI22,, thetheoutput.
Even
atthe atperforming
temperature
Since
the electrodes
sensormaintainsitssensitivity
0100
Humidity
0 0electrolytic
solution andisrarelyacorrections,level not
lower
than
80%.
By
excelsinaccuracy
itit minimizes
reading
221000 Humidity
Since
orrarely
excelsthein electrodes
accuracyand(ppm)
sensormaintains
its sensitivity
minimizes
reading0electrolytic
solution isacorrections,level not
lower
than
80%.
By at (%)100
00Temperature
40
20
(ppm)
,
the
sensorcorroded
by
CI
40
0
20
performing
temperature
reproducibility.
Time(min.)
fluctuations.
The
outputisnot2electrolytic
rarelyTemperature
reproducibility.
Time (min.)alevel not lower
80%.
By
(%)
fluctuations.
Thethanoutputis notcorroded
bysolution
CI2, theissensor
0Temperature(℃)
performing
temperature(ppm)
Temperature(℃)
excels in by
accuracy
andcorrections,itminimizes
reading
Temperature
0 02
affectedbyhumidity.
(%)
0
,
the
sensorcorrodedCI
performing
affected bytemperature2
excels in accuracy
andcorrections,
ithumidity.
minimizes reading
40
2
20
00
0 0 Time (min.)reproducibility.
fluctuations. itThe
output is
not
40
0
20
excelsin accuracy andcorrections,minimizes
reading
0 Time (min.)2
reproducibility.
0 Temperature (℃)
fluctuations.
The
output
is
not
40
20
4.
affected by humidity.
Temperature
(℃)
5.
of
4. Detectable
Detectable gas,
gas, molecularmolecular formula,formula, model,
model,and detection
detection
reproducibility.
Time (min.)andfluctuations.
The
output is not
5. Products
Productsof thisthis typetype0(examples)(examples)
affected by humidity.
Temperature (℃)
range
affected by humidity.
range (examples(examples))○ Stationary products

4. Detectable gas, molecular formula, model, and detection
4. Detectable gas, molecular formula, model, and detection
Molecular formula,
Detection
range(examples4.
Detectablegas,) molecularmodel, and detection
Detection
Detectable
gas
Model
Detectablegas ) Molecular
Model ##
range
(examples
formularange
formularange
range (examples) Molecular
Detection
Chlorine
Chlorine
Detectablegas
Detectablegas
HydrogenfluorideHydrogen fluoride
Detectable
gas
Chlorine

Fluorine
Chlorine
Fluorine
Hydrogen fluoride
Chlorine
Chlorine
Hydrogen
Chlorine fluoride
trifluoride
Fluorine
Hydrogentrifluoride fluoride
Fluorine
Ozone
Chlorine
Fluorine
Ozone
Chlorine
trifluoride
trifluoride
ChlorineOzone
trifluoride
Ozone
Ozone

Cl
Cl2

2
Molecular
formulaMolecular
HF
formulaHF
Cl2
formulaF

ClF222
HF2
Cl
HF
ClF
ClF
F2 33
HF
F2
FO
2 33
O
ClF
3
ClF3
ClF
O33
O3
O3

Model #
Model#
ES-K233
ES-K233
Model#

ES-K233
ES-K233
ESK-233C
ESK-233C
ES-K233
ES-K239C
ES-K239C
ESK-233C
ESK-233C
ESK-233C
ES-K239C
ES-K239C
ES-K239C

0-1.5
0-1.5 ppm
ppm

Detection
range
Detection
0-9
range
0-9 ppm
ppm
0-1.5
ppm
range
0-3 ppm
0-1.5
0-3 ppm
ppm
0-9 ppm
0-1.5
ppm
0-9 ppm
0-3
ppm
0-9
0-1
ppm
0-1ppmppm
0-3
0-3 ppm
0-1 ppm
0-1 ppm
0-1 ppm

Stationary
5.○Products
ofproducts
this type (examples)
5. Productsof this type (examples)...
GD-70D...
GD-70D
5.
Products
ofthistype (examples)○ Stationary products○ Stationary products...
GD-70D products
Portable○○○Stationary
Portable
products...
GD-70D products...
SC-8000,...
...GD-70D
SC-8000, TP-70D
TP-70D○ Portable products○ Portable products... SC-8000,
TP-70D○ Portableproducts... SC-8000,
TP-70D... SC-8000, TP-70DSC-8000
SC-8000
SC-8000
SC-8000
SC-8000