Apera Instruments PH20 User manual

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PH20 Value pH Tester
Instruction Manual
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APERA INSTRUMENTS, LLC
www.aperainst.com
v 3.4

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1.!Battery!Installation!
Please install batteries according to the following steps. *Please note the correct
direction of battery installation:
The Positive Side (“+”) OF EVERY SINGLE Battery MUST FACE UP.
(WRONG INSTALLATION OF BATTERIES WILL CAUSE DAMAGE TO THE
TESTER AND POTENTIAL HAZARDS!)
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2.!Keypad!Functions!
■Short!press-------!<!2!seconds! !
■Long!press--------!>!2!seconds!
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1.!Short!press!to!turn!on,!long!press!to!turn!off;!
2:!When!turned!off,!long!press!to!enter!setup;!
3:!In!mode!setting,!short!press!to!change!
parameter;!
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1.When!turned!on,!long!press!to!enter!calibration!
mode.!
2.In!calibration!mode,!short!press!to!confirm!
calibration;!
3.In!mode!setting,!short!press!to!confirm!parameter!
selection.!
Diagram!-!1!

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3.!Complete!Kit!
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Things!needed!in!addition!to!what’s!in!the!box!
A!clean!cup,!distilled!water!(8-16oz),!and!tissue!papers!for!rinsing!and!drying!the!
probe.!
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4.!Calibration!
4.1!If!it’s!first!time!use!or!the!tester!hasn’t!been!used!for!a!long!time,!pour!some!
pH!4.00!solution!to!the!Fill!line!in!the!probe!cap,!soak!probe!for!about!15!minutes!
to!hydrate!the!pH!sensor.!
4.2!Short!press! ! ! ! ! to!turn!on.!Rinse!in!distilled!water;!shake!the!meter!in!the!
air!and!use!tissue!paper!to!dap!off!excess!water.!
4.3!Long!press! !!!!to!enter!calibration!mode;!Short!press!!!!!to!exit.!
4.4!Insert!the!probe!in!the!7.00!pH!calibration!solution;!Stir!gently;! !
!!!leave!it!to!stand;!Wait!for!the!smiley!face! ! ! ! ! to!appear!and! !
!!!stay!on!the!screen!(see!Diagram!3);!short!press! ! ! ! !to!complete! !
!!!1st!point!calibration,!tester!returns!to!measurement!mode;!
!!!calibration!icon! ! ! ! displays!on!button!left!side!of!the!screen.!
4.5!Rinse!probe!in!distilled!water.!Long!press! ! ! ! ! to!enter!calibration!
!!!mode;!insert!the!probe!in!the!pH!4.00!calibration!solution,!stir!gently;!leave!it! !
Diagram!-!2!
Diagram!-!3!

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!!!to!stand;!wait!for!the!smiley!face!!!!to!appear!and!stay!on!the!screen;!then! !
!!!short!press! ! ! ! ! to!complete!the!2nd!point!calibration,! !
!!!tester!returns!to!measuring!mode,!calibration!icons! !!!!!!display!on! !
!!!bottom!left!side!of!LCD.!
■ Notes!
a) Tester!will!automatically!recognize!pH!buffer!solution,!users!can!choose!
calibration!points:!1!point,!2!points,!or!3!points.!But!the!1st!point!calibration!
must!be!in!calibration!solution!of!7.00!pH,!then!followed!by!2nd!or!3rd!point!
calibration.!For!details,!please!refer!to!the!following!table:! !
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Calibration!Solution!
Calibration!
Indication!icon!
Recommended!Accuracy!
and!Range!
1-point!
Calibration!
7.00!pH!
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Accuracy!≥!0.1pH!
2-point!
Calibration!
7.00!pH!and!4.00!pH!
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Measuring!Range!<7.0!
pH!
7.00!pH!and!10.01!pH!
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Measuring!Range>7.0!
pH!
3-point!
Calibration!
7.00!pH,!4.00!pH! !
and!10.01!pH!
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Wide!measuring!range!
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b) Automatic!self-diagnostic!information:!if!measured!value!is!far!off!to!the!
preset!range,!LCD!will!display!“Er1”;!In!calibration!mode,!if!the!measured!
value!hasn`t!been!stable,!i.e.!!!!!has!not!been!staying!on!LCD,!pressing!!!!!
will!cause!LCD!to!display!“Er2”.!
5.!Measurement!
5.1!Short!press! ! ! ! ! to!turn!on!the!tester.!Rinse!probe!in!distilled!water,!shake! ! !
!!!the!meter!in!the!air!and!dap!it!with!tissue!paper!to!remove!excess!water.!
5.2!Stir!probe!in!sample!solution!gently,!leave!it!to!stand.!Get!readings!after!!!!!
!!!!!!comes!up!and!stays.!
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■ Notes!
n If#you#see#some#white#crystalline#solid#leaked#out#of#the#pH#probe,#that’s#the#reference#
solution#(3M#KCL)#inside#the#probe.#It#is#NOT#a#sign#of#any#defective#issue.#It#is#a#normal*
phenomenon#when#the#probe#is#stored#dry#for#a#period#of#time.#It#proves#that#the#
junction#of#the#probe#is#working#well.#Users#can#simply#rinse#the#probe#in#distilled#water#
to#remove#the#solids#and#use#the#tester#as#usual.#
n After#each#test,#users#should#rinse#the#pH#probe#thoroughly#with#distilled#water#or#
purified#water.#
n For#the#premixed#pH#calibration#buffer#solutions,#we#recommend#replacing#them#after#
10#to#15#times#of#use#to#keep#its#accuracy.#
n This#meter#will#NOT#give#accurate#or#stable#pH#readings#when#testing*distilled*or*
deionized*water.#This#is#because#distilled#or#deionized#water#do#not#have#enough#ions#
present#for#the#electrode#to#function#properly.#To#measure#distilled#or#deionized#water’s#
pH,#users#need#to#use#a#specialized#instrument.#Contact#us#at#[email protected]#for#
more#details.#When#testing#purified#water#like#spring#water#or#drinking#water,#it#will#
take#longer#for#the#readings#to#get#stabilized#(typically#3-5#minutes)#because#there#is#
very#few#ions#left#to#be#detected#by#the#sensor#in#those#purified#water.# #
n Do#NOT*store*probe*in*purified*water#because#that#will#cause#permanent#damage#to#
the#pH#probe.#Purified#water#is#only#recommended#for#rinsing#the#probe.#The#probe#
should#be#stored#in#3M#KCL#pH#electrode#storage#solution#(SKU#AI1120)#for#best#
accuracy#or#stored#in#the#pH#4.00#calibration#solution#as#an#alternative#if#storage#
solution#is#not#handy.#
n Do#NOT#use#any#other#brand’s#storage#solutions#because#different#chemicals#may#be#
used#and#potential#permanent#damage#could#be#caused#to#the#meter.#
n Storing#the#probe#dry#will#NOT#cause#permanent#damage#to#it.#It#will#only#temporarily#
cause#the#probe#to#lose#its#sensitivity,#which#can#always#be#restored#by#soaking#in#the#
storage#solution#or#pH4.00#calibration#solution.!
6.!Parameter!Setting!
6.1!Setting!Schedule!
Prompt!
Mark!
Parameter!Setting!Items!
Code!
Factory!
Default!
P1!
Select!pH!buffer!
USA!–!NIST!
USA!
P2!
Select!Temperature!Unit!
˚F!–!˚C!
˚F!
P3!
Back!to!Factory!Default!
No!–!Yes!
No!

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6.2!Parameter!Setting!
When!turned!off,!long!press! ! ! ! ! to!enter!setup! →!short!press! ! ! !!to!switch! !
P1-P2-P3→!Short!press! !!!,!parameter!flashing→short!press! !!!!to!choose,!
short!press! ! ! ! to!confirm!parameter!selection→Long!press! ! ! ! ! to!go!back!to! !
measurement!mode.!
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6.3!Parameter!Setting!Instruction!
Select!standard!pH!buffer!solution!(P1):!There!are!two!options!of!standard!buffer!
solutions:!USA!series!and!NIST!series!as!the!following!chart:!
!!!!Icons!
pH!standard!buffer!solution!series!
USA!series!
NIST!series!
Three-Point!
calibration!
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1.68!pH!and!4.00!pH!
1.68!pH!and!4.01!pH!
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7.00!pH!
6.86!pH!
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10.01!pH!and!12.45!pH!
9.18!pH!and!12.45!pH!
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!!!6.4!For!the!self-diagnosis!information,!please!refer!to!the!table!below:!
Symbol
Self-Diagnosis information
How to fix
Wrong pH calibration solution, which
exceeds the recognizable range of
the meter.
1. Check if calibration solution is correct
2. Check if probe is damaged.
3. Check if there is any air bubble in the
glass bulb sensor
Is pressed before measurement
is stable ( appears and stays)
Wait for the smile icon to appear and
stay, then press
* If you find any air bubble in the glass bulb of the pH sensor, simply shake the probe for a few times
to remove it. The existence of an air bubble in the glass bulb will significantly decrease the accuracy
of measurement.

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* The 1st point calibration must be 7.00 pH. Perform the 2nd point calibration (4.00 pH) immediately
after the 1st point. Do NOT turn off the meter before you conduct 2nd point calibration. If the meter is
turned off after 1st point calibration, users will need to restart the calibration process with the 7.00 pH
and the 4.00 pH following after. Calibrating directly in pH 4.00 after turning meter off and back on will
cause Er1.
!7.!Technical!Specifications!
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8.!Tester!Functions!
!!8.1!Calibration!points!indication:!
!!8.2!Stable!Measurement:!!!!!appears!and!stays!on!the!screen!
!!8.3!Self-Diagnostic!information:!Er1,!Er2!
!!8.4!Low-Voltage!warning:!!!!!!flashes,!reminder!of!battery!replacement!
!!8.5!Auto!Power-Off!in!8!minutes!if!no!operation.!
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Go!to!support.aperainst.com!to!find!tutorial!videos!and!FAQ!articles,!or!submit!a!
ticket!if!you!have!any!questions!regarding!the!using!meter.!
pH!
Range!
0!-!14.0!pH!
Resolution!
0.1!pH!
Accuracy!
±0.1!pH!
Calibration!Points!
1!-!3!points!
Automatic!Temperature!Compensation!
0!–!50˚C!(0!–!122˚F)!
Temp.!
Range!
0!–!50˚C!(0!–!122˚F)!
Resolution!
0.1!˚C!
Accuracy!
±0.5˚C!

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9.!Warranty!
We!warrant!this!instrument!to!be!free!from!defects!in!material!and!workmanship!
and!agree!to!repair!or!replace!free!of!charge,!at!option!of!APERA!INSTRUMENTS,!
LLC,!any!malfunctioned!or!damaged!product!attributable!to!responsibility!of!APERA!
INSTRUMENTS,!LLC!for!a!period!of!TWO!YEARS!(SIX!MONTHS!for!the!probe)!from!the!
delivery.! !
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This!limited!warranty!does!not!cover!any!damages!due!to:!
Transportation,!storage,!improper!use,!failure!to!follow!the!product!instructions!or!
to!perform!any!preventive!maintenance,!modifications,!combination!or!use!with!any!
products,!materials,!processes,!systems!or!other!matter!not!provided!or!authorized!
in!writing!by!us,!unauthorized!repair,!normal!wear!and!tear,!or!external!causes!such!
as!accidents,!abuse,!or!other!actions!or!events!beyond!our!reasonable!control.!
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APERA INSTRUMENTS, LLC
Address:!6656!Busch!Blvd,!Columbus!Ohio!43229!
Tel:!1-614-285-3080!
Email:[email protected]!
Website:!www.aperainst.com!