Martek MARK 22 User manual

MARTEK INSTRUMENTS, INC.
OPERATION MANUAL
MARK 22
IN SITU CALIBRATOR
Rev.NC(1) -10/04


iMartek Instruments, Inc.
Unless otherwise stated, MARTEK INSTRUMENTS, INC. warrants this equipment to
be free fromdefects in material andworkmanship andtoperform in accordance with
applicable specificationsforoneyear fromdate ofshipment.
MARTEK will provide free service atthe factory,including parts, labor and
transportation back to the customer,for any malfunction of its products, whichare
returnedtransportation charges prepaid.
Customers desiring to return aproduct to MARTEK for repair should contact the
Service Department by telephone [phone] or fax [phone] to obtain return
authorization. Theinformation requiredat this time will be the complete model number
andserial numberof the product andabrief descriptionof the problem.
All shipments to MARTEK must be freight prepaid and addressed as follows:
MARTEKINSTRUMENTS, INC.
5201 Old Poole Rd.
Raleigh, NC 27610
Attn.: Repair Department
Acomplete and detailed statement of the reason for return must accompanythe unit.
Ifpossible, include acopyofsample readingoraprintout.
Returned units must be packed as well as they were when first shipped. If possible,
use the original packing. Do not return detachable cords or manuals with the unit.
MARTEK reserves the right to void this warranty if the product has been subjected to
misuse, neglect, accident,improperinstallation orapplication,andfor consumable
items such as batteries, membranes, or solutions.
This warranty is expressly in lieu of all other obligations or liabilities on the part of
MARTEK. MARTEK neither assumes nor authorizes any other person or organization
to assume on behalf of MARTEK any other liability in connection with the sales of
MARTEK instrumentation.
WARRANTYPOLICY

ii
TABLE OF CONTENTS
Martek Instruments, Inc.
CHAPTER1INTRODUCTIONPAGE
Section1.0 -WhatIsACalibrator?..................................................................................................1
1.1 -HowTheMark22CanBenifitYou..............................................................................1
1.2 -HowToReadTheManual...........................................................................................1
CHAPTER2OVERVIEW
Section2.0 -OperatinalOverview...................................................................................................2
2.1 -"Quick-Cal"CalibrationProcedures.............................................................................4
CHAPTER3SPECIFICATIONS & SETUPPAGE
Section3.0 -Specifications-Measurement......................................................................................5
3.1 -Specifications-Physical...............................................................................................5
3.2 -AccessoriesAndSensors.............................................................................................6
3.3 -SettingUp The Mark 22..............................................................................................8
3.3.1 -ConnectingTheConductivitySensor............................................................................9
3.3.2 -ConnectingThepH Sensor..........................................................................................9
3.3.3 -ConnectingTheTemperatureSensor..........................................................................11
3.3.4 -ConnectingTheRecorderCable................................................................................11
3.3.5 -ConnectingThe BatteryCharger...............................................................................11
CHAPTER4OPERATIONPAGE
Section4.0 -TheMark22ControlPanel.......................................................................................12
4.1 -HowToUseThe Keys..............................................................................................13
4.1.1 -NormalOperatingMode...........................................................................................13
4.1.2 -Set Up Mode............................................................................................................14
4.1.3 -CellMode.................................................................................................................15
4.1.4 -DataLogMode.........................................................................................................15
4.1.5 -PrintMode................................................................................................................15
4.2 -HowToSetUpTheSystem......................................................................................16
4.2.1 -TemperatureCompensationFormulas........................................................................16
4.2.2 -HowToSelectTheConductivity"k"factor................................................................19
4.2.3 -HowToLog Data.....................................................................................................20
4.2.4 -PrintFunctionSetup..................................................................................................21
4.25 -How ToUseThe Recorder Output............................................................................22

iiiMartek Instruments, Inc.
CHAPTER5CALIBRATIONPAGE
Section5.0 -WhyShouldYouCalibrateTheMark22?..................................................................24
5.0.1 -MaterialsRequiredFor Calibration............................................................................24
5.1 -TemperatureCalibration.............................................................................................24
5.1.1 -AutoTemperatureCalibration....................................................................................25
5.1.2 -ManualTemperatureCalibration................................................................................25
5.2 -ConductivityCalibration.............................................................................................27
5.2.1 -ConductivityZeroAdjustment....................................................................................27
5.2.2 -ConductivitySpanCalibration....................................................................................28
5.3 -pHCalibration...........................................................................................................31
5.3.1 -pHZeroAdjustment..................................................................................................31
5.3.2 -pHSpanAdjustment..................................................................................................32
5.4 -HowToSetDateAndTime.......................................................................................32
5.5 -FrequencyOfCalibration...........................................................................................33
CHAPTER6MAINTENANCE&TROUBLESHOOTINGPAGE
Section6.0 -TheReadoutModule.................................................................................................34
6.1 -Sensors....................................................................................................................34
6.2 -TroubleshootingGuide...............................................................................................34
TABLE OF CONTENTS

1
INTRODUCTION - 1
Martek Instruments, Inc.
1.0WHAT ISACALIBRATOR?
TheMartek Mark22In-SituCalibrator is
acompletely portable,battery-operatedelec-
tronic instrument that can beused tovali-
date the performanceand accuracy of on-
line, process watermonitoring instruments.
TheIn -Situ Calibrator is designedfor usein
applications inwhich the measurement of
water properties such as temperature, con-
ductivity,temperature-correctedconductiv-
ity,and pH arerequired.
The Mark22can becalibrated in the labo-
ratory to ASTM (AmericanSociety for Test-
ingof Materials)or NIST (National Institute
ofStandards and Testing) guidelines and
proceduresusing any manufacturer’scon-
ductivity reference cell or pHelectrode. The
portability ofthe unitallows it to then be
transferredto the sample stream for direct,
on-site monitoring of the waterproperties
used todetermine water quality.
1.1HOW CAN THE MARK 22
BENEFIT YOU?
Byeliminating the needfor physical grab
samples,the Mark 22provides amorereli-
able and efficientmethod for validating
and/or calibrating on-line instrumentation.
Its accuracy and resolutionallow the opera-
tor to detect subtle changes in water chemis-
try thatcanaffect theturbine steam quality ,
the performance ofcondensate polishers,
resin beds, andother process systems.
In addition, the Mark 22 features battery
backed up NVM memoryin which moni-
tored datacan be stored and retrievedlater
by apersonal computer viathe unitsserial
port for storage, review and analysis. As an
alternate recording method, aserial data in-
put printer can be connected to the serial port
ofthe Mark22in applications in which a
hardcopy recordofthe datastored in the
Mark 22In-SituCalibratoris required. This
featureallows the operator to create and
maintain ahistorical record of calibration and
performance datafor on-line instruments.
TheMark22can alsoserve as aback-up
monitoringsystem in the eventof on-line
equipment failure.A0-1 Voltanalog output
signal for all parameters isalso availableto
facilitate the interfaceof theMark 22 directly
to apaperstrip-chart recorder.
1.2HOW TOREAD THIS MANUAL
Carefully review the material in this
manualbefore operatingthe Mark 22. The
OVERVIEW inChapter 2providesbrief de-
scriptions of thefeaturesofthe calibratorand
an example of aquick calibrationprocedure
forconductivity.Chapter3reviewsthespeci-
fications for the instrument and givesade-
taileddescription of how to set upthe unit.
Thecomplete operational instructions are
outlined inChapter 4,andChapter5details
the calibration procedure. The MAINTE-
NANCE &TROUBLESHOOTING chapter
provides routine maintenancerequirements
for the Mark 22and its probes.
Shouldyou haveany questions or com-
mentsregarding the Mark 22,its sensors, or
this Manual, pleasecontactthe factory.

2
2- OVERVIEW
Martek Instruments, Inc.
2.0OPERATIONAL OVERVIEW
Ashortdescriptionofthe different fea-
tures of the Mark 22 isgiven below.Abbre-
viated instructions are providedforreview
of the connectionsof the conductivity,tem-
perature, and pH sensors and the battery
charger.Adescription ofthe operational fea-
tures provided by the EIGHTkeyson the
front panel isalso presented.Formore de-
tailedinformation on operationandcalibra-
tion procedures, referto the appropriate
chapterswithin the Manual.
1.Connect the Martek conductivityrefer-
ence sensor to the connectors labeled
"COND"and"TEMP" on the side of the
Mark22readout module.
2.Connect the pH sensor tothe connector
labeled "pH"onthe side of the Mark 22
readout module. The temperaturefrom
theMartek conductivity reference sensor
alsoprovides the temperaturefor com-
pensation of the pHmeasurement.If the
Martek conductivityreference sensoris
not used, you must usethe separatetem-
peraturesensorlocated on the pH plug
(P/N 180-51A) or the dip-styletempera-
turesensor(P/N 182-24T).
NOTE: If the pH sensor is not being used, the
shorting plug on the Mark22 readout module
mustbe connected to the pHinputconnector.
This plugconnectsthe input to thepHcircuit to
analoggroundallowingONLYconductivityand
temperaturemeasurementstobemade.
3.Tocharge the internal batteries, (a) con-
nectthe circular plug from the AC bat-
tery charger tothe Mark 22and(b) con-
nect thebattery charger to an 120V/60
Hz AC power outlet.
CAUTION: Make sure the power
switchis OFF when connecting or
disconnecting thebatterycharger.
The power switch can be on or off
when charging the internalbatteries.
4.After all sensor andpower connections
have been made, the Mark 22 can be op-
erated. Flip the switchlabeled POWER
tothe UP position (poweron ). Flip the
switch labeled LAMPto the UP (back-
light on)to illuminate the Mark22’s dis-
play.The Back Lighting Lamp in the Mark
22displayconsumes considerablepower,
andas aresult willlimit the unit's bat-
terypoweredoperating timeto approxi-
matelyFOURhours.With the LampOFF,
the Mark 22will provide reliable opera-
tion for approximately12 hoursormore.
5.The Mark22sequentiallydisplaysdate,
time and battery voltage; correctedcon-
ductivity,rawconductivity andtempera-
ture; and solution compensatedpH,pH
andtemperature. Depress the SELECT
keyandobservethat the letter "M" ap-
pears inthe lower right cornerof the
Mark22display.The "M"indicates that
ManualMode is in operation. The Mark
22 willthen continuouslydisplay the cur-
rently displayedparameter.Depress the
SELECT key again, and the displayed
dataadvances tothe nextset ofparam-
eters .
Depress the EXIT key to exitthe Manual
Mode. Observethat the letter"A" appears
inthe lower right corner ofthe units dis-
play.The letter "A" indicates that the
ManualMode has been exitedandthat
the unitis nowin the Auto Mode of op-
eration.Whenin theAutoMode the Mark
22willcontinuouslyscan through all of
itsmeasuredas wellas manually entered
parameters.
6.The FOURMODE KEYS along the bot-
tom rowofthe frontpanel (SETUP,CELL,
LOG,andPRINT)refer tothe different
modes of operation featured by the Mark
22. Thefourtri-legened FUNCTIONkeys
along the top row of the frontpanel are
useddifferently duringeachmode. Tofa-
cilitate operation of the Mark 22 the func-

3
OVERVIEW - 2
Martek Instruments, Inc.
tion legends and the associatedmode
have the same colorlegend and border.
In the NormalDisplay Monitoring
Mode the top row of keys with the
WHITE borders are function keys. The
functions providedby thesekeys are
identified by the WHITE key legends lo-
cated just abovethe top row of function
keys. The READ key willholdthe dis-
play in Manual Mode.The RANGE keys
will changethe range for the conductiv-
itydisplay,andthe AUTOkey will restart
the automatic display monitoringmode.
In the SetupMode the top rowof keys
areused as function keys.The functions
provided bythese keys areas indicated
by the YELLOW key legends located on
eachof the function keys.The SELECT
keyis usedtoselect options from thedis-
playedmenu. The UP ARROW key
moves the blinking display down
throughthe menus and increments the
numericdigitswhen adjustmentof the
displayed numeric value is required. The
DOWN ARROW key moves the blink-
ingdisplay upthroughthe menus and
decrements the numeric digits when ad-
justment ofthe displayednumericvalue
is required. The EXIT key allows theuser
tomove backwards through the dis-
playedmenus.
In the CellMode,the top row of keys
function as indicated by the BLUE key
legend located on eachof the top row of
function keys. The K0.01, K0.1, K1 and
the K10 keysare usedtoselect thecell
constant stored forCell#1, Cell #2, Cell
#3andCell #4 respectively.
In the LogMode,the top row of keys
function as indicated by the RED key leg-
endlocated oneach of thetoprow ofkeys.
Tolog data, depressthe LOG key once.
TheMark22willdisplayafilenumber.
Depressthe LOG keyagain,and observe
thatablack square willappear inthe up-
perright corner ofthe display.Thisindi-
cates that the Mark 22 isnow inthe Log
Modeofoperation. Depressthe LOG key
again,andobservethat the black square
isno longer present inthe display.This
indicates that the Mark 22LogModehas
been exited.The FREE will display the
amountof storage memory remainingin
terms of storage time( hours). When in
the LogMode, pressing the PAUSE key
will cause aletter "P"to appear in the right
corner of the display.The Mark 22 will
stop logging but remain in theLogMode.
Thisprocedure is used to conserve
memory.Depress the RESUME function
key to resumelogging data. Finally,The
CLEAR function keywillclear allof the
logged datafrom memory.
7.Depression of the yellow SETUP keyen-
ables the setup mode of operation and
subsequentlyallows the operatoraccess
tothe unit's setup functions.The Setup
functions providedby the Mark 22areas
follows:
CAL (Calibration)option is used for es-
tablishmentofthe zero andspan calibra-
tion points associatedwith temperature,
conductivity andpH measurementsas
well as manualentry of the dateand time
of day parameters.
COMP (Compensation)option provides
theselection of three temperaturecor-
rected conductivity equations: GE, Marsh
&Stokes, and Truman Light in addition
to the slope coefficients for conductivity
andpH.Thisfunction also allowscali-
brationof0-1Volt external recorderout-
put.
CELL option allowsthe operatorto
manually input aspecific cell constantfor
eachof the four nominal cell constants.
Forultrapure water,thenominal cellcon-
stant is0.01.
The LOG optionallows the operatorto
manually enter the start timeto begin log-
ging data,the logging interval (the time
inminutes betweenscans), andthe num-

4
2- OVERVIEW
Martek Instruments, Inc.
ber of scans.
8. The PRINT Mode allowsprintingof the
variousdatafiles byfile number.Toprint
orrecord datafrom the Mark 22's inter-
nal memory the unitmust beconnected
via its serial portto computeror printer
whichhas aserialinput interface. This
interface must be configured with the
samebaudrate,#of data bits, stop bits,
andparity type configured inside the
Mark22forserial communications. Re-
fertothesection4.2.4 of this Manual for
moredetailed information regarding the
print function.
2.1"QUICK-CAL"CALIBRATION
PROCEDURE
Thissection provides aneasyreference
or "quick-cal" procedureforelectronically
calibrating the Mark22for conductivity mea-
surements. However,beforeperforminga
calibrationofthe Mark22using this proce-
dure, itis recommended thatyou review
Chapter 5(CALIBRATION )of this manual.
Calibrationproceduresforallparameters
arelocated in the CALIBRATIONsection of
this Manual.
1.Selectacell number for calibration. De-
press the CELL keyandselectacellnum-
ber1-4. (Select aKfactor of .01000 for
ultrapureprocess water applications ).
2.Placethe Mark 22 in Manual Display
Mode for the conductivity parameter.
3.Using the range keys(UP and DOWN
ARROWS), set the decimal point to read
thehighestrange(XXX.XX µS/cm).
4.Selectthe SETUP Mode of operationby
depressing the SETUP key.From the
setup menu select the CAL option.Select
CONDoptionfrom the CALmenu menu
as the type of parameter to becalibrated.
Select ZERO asthetypeofcali-
brationto beperformed. Connectthezero
calibrationplug (P/N 400550) to the test
leads.The voltage should be approxi-
mately-1.000 Volt.Enter the zero value
forconductivity bypressingthe SELECT
key andentering000.00 µS/cm.
5.Exitthe set ZERO point function by de-
pressingthe EXITkey.Using the range
keys (UP and DOWN ARROWS), set the
displayed measured value to the lowest
range (0.0000 µS/cm).
6.Selectthe SETUP Mode of operationby
depressing the SETUP key.From the
setup menu select the CAL option.Select
CONDfrom the displayed menu as the
parameter tobecalibrated. Select SPAN
as the type of cali-bration to be per-
formed. Removethe zerocalibration plug
andmake sure the span calibration plug
(P/N 400549) has been placed between
thetestleads. The voltage should beap-
proximately+0.5000 Volts. Enter the span
value for conductivity by pressing the SE-
LECT key and entering1.0000 µS/cm.
7.At thispoint, the Mark 22 isnow cali-
brated forconductivityfor anysensoruti-
lizing acell constant of 0.01.Butbefore
measurements can be taken, depressthe
CELL key and select acell with the same
cellconstant as the specific conductivity
reference sensor.Depress the CELL key
again toreturn theMark22tothe manual
display mode.
NOTES:
1. If not using aMartek Conductivity Reference
Cell, the temperature sensor mustbe connected.
2. Temperaturemust always be calibrated before
conductivity and pH.
3. Use a1KOhm, .5% resistorfor10 µS/cmrange.
4. Use a100 Ohm, .5%resistor for 100 µS/cm
range.

5
SPECIFICATIONS AND SETUP- 3
Martek Instruments, Inc.
3.1 SPECIFICATIONS -PHYSICAL
Case Dimensions:
Front Panel -7.0x6.5x4.0 inch
(17.8 x16.5x10.1cm)
LWH
Case Weight: 6lbs. (2.1 kg)
Power Requirement:
6Volt DC power
120 or 230 Volt ACwhen
the factorysupplied
batterycharger is used.
3.0SPECIFICATIONS -MEASUREMENT
Parameter Range Resolution Accuracy
Temperature0-100°C±0.01° C±0.1° C
Conductivity*0-1.0000 µS/cm±0.0001 µS/cm±0.001 µS/cm
0-10.000 µS/cm±0.001 µS/cm±0.01 µS/cm
0-100.00 µS/cm±0.01 µS/cm±0.1 µS/cm
0-1.0000 mS/cm±0.0001 mS/cm±0.001 mS/cm
0-10.000 mS/cm±0.001 mS/cm±0.01 mS/cm
0-100.00 mS/cm±0.01 mS/cm±0.1mS/cm
pH2-12pH±0.01 pH±0.1pH
*The Conductivity measurement accuracy is dependenton entry of the appro-
priate cell constant for the indicated range of measurement andon the quality
ofthe electrode used.
Recorder Output:
RS 232C Serial ASCII
or0-1voltDCanalog
output.

6
3 - SPECIFICATIONS AND SETUP
Martek Instruments, Inc.
3.1ACCESSORIES AND SENSORS
TheMark 22In SituCalibratorcomes complete fromthe factorywith the following
accessories:
Mark 22 with Carrying
Strap (P/N 182-10) BatteryCharger (P/N 221042) Recorder Cable (P/N 603050)
If any of theseitems aremissing, contact the factory immediately.
pH Interconnect Cable for
BNC pH Sensor
(P/N 603052)
ConductivityInterconnect
Cable (P/N 603051) Calibration Plugs for ZERO (P/N 400550) and SPAN
(P/N 400549)

7
SPECIFICATIONS AND SETUP- 3
Martek Instruments, Inc.
In addition,thefollowing sensorsandaccessoriesmay also bepurchasedfrom Martek for
usewith the Mark 22:
ConductivityReference
Cell (P/N 182-21, 0-50uS/
cm or P/N 182-22,
0-1000uS/cm)
pH Sensor (P/N 182-24S)Temperature Sensor
(P/N 182-24T)
Stainless Steel FlowChamber
(P/N 180-51) pH Adapter Plug w/Temp. Cable (P/N 180-51A)
MARTEK
INSTRUMENTSINC.
R

8
3 - SPECIFICATIONS AND SETUP
Martek Instruments, Inc.
Figure 3.1 -Mark 22 Connector Locations
3.3SETTING UPTHE MARK 22
There are fourcircular connectorsanda
battery charger input jack located onthe left
side of the Mark22Readout Module. SeeFig-
ure3.1below for connector location.

9
SPECIFICATIONS AND SETUP- 3
Martek Instruments, Inc.
Eachsensorinput connectoris clearly
marked with the type ofsensor thatshould
beconnected to it. The connectorlabeled REC
isfor the recorder cable.BelowtheRECcon-
nector isthe batterychargerinput jack plug.
3.3.1Connectingthe Conductivity
Sensor
Toconnect the Martek conductivity ref-
erence cell,remove the dustcaps from the
connectorslabeled TEMPandCOND and
connectthe appropriately markedcablesof
thereferencecelltotheMark22. Make sure
the correct cable isinserted into the correct
connector (thecable identification labels are
locatedjust below the reference cell plugs ).
Toconnect anyother conductivity refer-
ence cell,connect the Conductivity Intercon-
nect Cableto the Mark 22connector marked
COND. Then connect the leads from the ref-
erence cell to the red and black banana plugs
according to the manufacturer’sinstructions.
When connectingany senorsto the
sample line, care shouldbetaken toavoid
any airfrom entering into the line. The in-
trusion of carbon dioxide into the sample can
cause low pH values, erratic conductivity
measurements ,andfluctuatingtemperatures
during measurement.
The Martek ConductivityReference Cell
comes with its ownintegral flow chamber.
The1/4 inch stainless steel tube fittings pro-
trudingfrom the cellcan beusedwith heavy
wall tygontubing.It makes nodifference
which end isthe inlet or the outlet. Amini-
mumflow of50 ml/minute is recommended
to prevent bubbles from adheringto the in-
side of the cell. After the cellhasbeencon-
nected,asharp rap to the sensor willdislodge
any trapped air bubbles.For best results, the
sensorshould be hung vertically with the
outlet at the top.
3.3.2Connecting the pHSensor
Toconnect the Martek pH sensor (p/n
182-245 ), remove the dust cap from the Mark
22 connector marked pH.Insert the plugof
theBNC pH adaptor cable(P/N 603052)into
the connector.Finally,connectthe plug from
thepH sensor tothe socket of the adaptor
cable.
Toconnect apHsensor from another
manufacturer,the sensorcable must be ter-
minatedwith aBNC-style connector.Fol-
low the samestepstaken toconnect aMartek
pHsensor to the Mark 22 Calibrator.
The pHsensor should beimmersed ina
flowing water stream which has not been
exposed to air.Theassembly drawing in Fig-
ure3.2illustrates acomplete layout of the
pH Adapter PlugAssembly.Ifthe Stainless
Steel Flow Chamber (P/N 180-51) and the
pH PlugAdapter(P/N 180-51A) havebeen
purchased with the Mark22, the following
procedures should befollowed:
A)Connect thetemperature cable to the BNC
connector of the Adapter Plug.
B)Remove the blackplasticpHsensor re-
tainer fromthe pH Plugalong with its
rubber O-ring. Remove the protectivecap
or soaker bottlefrom the pH electrode
andcarefully slidethe retainer,then the
O-ring, over the pHelectrode andscrew
the threaded cap of the electrodeinto the
retainer.Carefully screw the retainer back
intothe pHPluguntil secure.
C)Remove the plastic locking nut from the
Stainless Steel Flow Chamberand care-
fully insert the pH Adapter Plug into the
FlowChamberuntil it restsflushwith the
top of the chamber.Slide the locking nut
over the pHsensor and temperature
cables and screw it firmly tothe cham-
ber.

10
3 - SPECIFICATIONS AND SETUP
Martek Instruments, Inc.
D)Toconnect the sample flow tothe cham-
ber,placethe inlet flowon the left plastic
fitting (with the mounting bracketfacing
away from you)andthe outlet flowon
theright plastic fitting.
Theoptimumflow forthe Martek
Ultrapure pH Sensor should remain between
45 -150ml/minute to avoid astreaming ef-
fect. The Martek temperature sensor or con-
ductivityreferencecellmust beconnectedto
the Mark 22 and subjected to the same sample
streamif temperature -corrected pH data is
to be obtained.
Figure 3.2 -pH Adapter Plug Assembly

11
SPECIFICATIONS AND SETUP- 3
Martek Instruments, Inc.
3.3.3Connecting The Temperature
Sensor
Remove the dustcap from the Mark 22
connector marked TEMP,insert the plugof
thetemperature sensor,andsecure.IfthepH
Adapter Plug (P/N 180-51A)is used, plug
thetemperaturecable into the connector
marked TEMP on the Mark 22.
3.3.4ConnectingTheRecorder
Cable
Tohook upthe Computer Interface Cable,
removethe dustcap from the Mark 22 con-
nector marked REC, insert the plug and se-
cure. Plugthe DB25-style connector into the
appropriate portonthe computeror printer
(SeeSection4.2.4for baudsettings, etc.). To
connect theMark22toanexternalstrip-chart
or line recorder,removethe DB25 connector
and connectthe wires to the recorder.Refer
to Section4.2.5for recorderoutput interface
cable connection.
3.3.5Connecting The Battery
Charger
Thecharging jack islocated below the
Mark22connector markedREC. When
chargingthe Mark 22internal batteries,it is
important to follow these two steps:
A)With the Mark 22 turned OFF,plug the
charging plug into the charging jack.
B)Plug the chargerinto awalloutlet that
carries the same voltage as that listed on
the battery charger.The Mark 22 can
nowbe turned ON.
The Mark 22can beoperatedeitheron
ACor internalDC power.However, the
Mark 22shouldbe operatedonly onDC
power when calibrating the instrument.
Thiswill prevent AC electricalnoise from
being coupled through the battery charger
andinterefering with the parameter voltage
signalbeing calibrated.

12
4-OPERATION
Martek Instruments, Inc.
4.0THE MARK 22 CONTROL PANEL
Figure 4.1 depictsthe Mark 22 Front Panel
with the various keys identified.
and battery voltage. Ifone of the sensors is
not connected properlyor the Mark 22 has
notbeen calibrated,the screen willdisplay a
message indicating thatthe sensor is not con-
nected or isnot calibrated.The number in the
upper right handcorner refers tothe soft-
ware version insidethe Mark 22. Ifasensor
isconnectedandcalibrated, the Mark 22will
commence monitoring.
Forimproved viewingangle and display
contrast, flipthe rocker switch marked
LAMP tothe UP position.
NOTE: TheMark22hasanoperatingperiodof
approximately 12 hourswithout thelamp on.
Ifthelampisactivated,theMark 22 willoper-
ate for approximately 8hoursbeforerequiring
recharging. Care shouldbe taken toavoidal-
lowingtheinternalbatteriesto fallbelow 5.9
Volts.
MARTEK INSTRUMENTS INC.
R
MARK 22 READ RANGE AUTO
POWER LAMP
SETUPCELLLOG PRINT
SELECT
K 0.01
FREE
K 0.1
PAUSE
K 1
RESUME
K 10
CLEAR
EXIT
Figure 4.1 - Mark 22 Front Panel
Tworocker switches labeled POWER and
LAMP arelocated onthe left side of the
panel.ToturnONthe Mark22, flip the
POWER switchupposition. The display will
activate and momentarily display the follow-
ingmessage:
The number inthe upper right corner re-
fers tothe version of software installedin
the Mark 22unit.Afterfive seconds the ini-
tial screendisappears, and the display be-
gins to cyclethrough the Display Mode. In
the Display Mode the Mark 22cycles through
threescreens: (1)correctedconductivity,raw
conductivity,and temperature;(2)solution-
compensatedpH,Nernstian-corrected pH,
andtemperature; and (3) date,militarytime,
MARTEK MK22V1.4
CONDpH TEMP

13
OPERATION -4
Martek Instruments, Inc.
4.1HOW TOUSE THE KEYS
Operationofsomeof thekeys described be-
low will require that theMark 22becalibrated.
If the Mark 22 has not been calibrated, proceed to
the chapter oncalibration after reading this sec-
tion.
In additionto the POWER and LAMP
switches, therearetwo rowsofbuttonsor
keys outlined in various colors. The KEY
LEGENDSindicate the operational mode or
functionassociatedwith the eachkey.The
bottomrowof keysare ModeKeys that al-
low the user toselect which operational
modeyou wish toplace the Mark 22 in. The
top row ofkeysare Function Keys that al-
low the user toselect aparticular value or
function associatedwith the current mode of
operation.
R E ADR AN G E AU T O
4.1.1 Normal Operating Mode
In the Normal Display Mode the top row
of keysfunction asindicated by the white
key lettering abovethe top row ofFUNC-
TIONkeys. The READ Key willholdthe dis-
play inMANUAL MODE. The UP ARROW
ANDDOWNARROW Keys will change the
displayrange of the conductivity measure-
ment, andthe AUTO key restarts the auto-
matic scan function in the display.
Depressingofthe READ willresult inthe
continuousdisplay ofthe data present inthe
displaywindow at the timethe key is de-
pressed. This feature allows the user to se-
lect aparticular sensor measurementfor be
continuousdisplayandmonitoring by the
Mark22. The letter "M"willappearin the
lower right-hand corner ofthe displayto in-
dicate that the Mark22is in the manual mode
for datapresentation.Ifthe READ key is
pressed again, the display willadvanceto
the next set of data. An example of the
READ key being depressedthree timesis
shown infollowing sequence of display
screens:
READ Key -1stDepression
READ Key -2ndDepression
READKey -3rdDepression
The first line of the screen indicates the
dateand military time.The secondline con-
tains the measured battery voltage. Unplug
thebatterycharger to readthe voltage stored
bythe battery.The potentialshould remain
SELECT
K0.01
FREE K0.1
PAUSE K1 RESUME
EXIT
K10
CLEAR
SETUP CELLLOGPRINT
D01/03 T09:56
BATTERY6.54 VM
13.043µS C Cond
14.520µS 28.15°M
08.64 ScpH
pH08.6427.56°

14
4-OPERATION
Martek Instruments, Inc.
above5.9Volts to prevent degradationof the
battery.
The first line of the conductivityscreen
displays the temperature-compensated con-
ductivity (S/cm)measured by the reference
cell. Thesecond line ofthedisplay shows the
rawconductivity(mS/cm) measured directly
bythe cellfollowed by the measured tem-
perature (°C).
The first line of the pHscreen showsa
pH which has been compensated for tem-
peraturewith both acorrection for the ex-
pectedvoltage change (Nernstian correction)
and acorrectionbased onthe ionization of
thesolution (not necessaryin solutions with
high ionicconductivity). The second line of
thedisplay shows apHmeasurement which
hasbeencorrected onlywith the Nernstian
correction andthe measured temperature.
These RANGE keysallow the Mark 22
to select one of three conductivityranges
when the Mark 22 ismonitoring conductiv-
ityin the MANUALmode.The YELLOW
ARROWS indicate which directionthe con-
ductivityrangecanbealtered. If the UP AR-
ROW key is depressed, the Mark 22 will
move the decimal point shownin the display
to the right. Ifthe DOWNARROW key is
depressed, the Mark 22 willmove the deci-
malpoint tothe left. Thisfeature allows you
to select alow,medium, or high range of mea-
surement. An exampleof the RANGE keys
functions are shownbelow .
UP arrow
1.3042µS C Cond
1.4523µS 28.15°M
01.304µS C Cond
01.452µS 28.15°M
UP arrow
4.1.2Setup Mode
TheSETUP modeallows theusertocali-
bratesensors, selecttemperature compensa-
tion formulas, change cell constants, set date
andtime, and toset upthe start timeand
interval for the logging function.The SE-
LECT Key isused toselect optionsfrom a
displayedmenu. The UP ARROW Key
moves the blinking display down through
themenus or increments the displayeddig-
its when adjustmentof anumericinput en-
tryis required. The DOWNARROWKey
moves the blinkingdisplayup through the
menus or decrements the displayed digits
when adjustmentof anumericinput entryis
required.
Depress the yellow SETUP key.The
Mark22 willdisplay the following screen:
The Mark22utilizes aSetupOption
Menu format that provides the userwith a
list of the available SetupOptions. The user
is required to select from this listthe desired
Setup operationto be performed. After the
SETUP keyhas been depressed, thetop row
offunction keys arenow inaffect.All text
andsymbolsin YELLOW are now applicable
CALCOMP
CELLLOG
UP arrow
01.304µS C Cond
01.452µS 28.15°M

15
OPERATION -4
Martek Instruments, Inc.
in regards to operation of the Mark 22.
Toselect aSETUP option, the user must
depressthe SELECT key.Tomove the flash-
ing promptup or down to another option,
youwould presseitherthe UP or DOWN
arrow keys.Toexitfrom the SetupOption
Menu the user must depressthe EXIT key.
which will return the Mark 22to the normal
display monitoring mode. The options pre-
sentedin the SETUP menu arediscussedin
Section 4.2andin the chapter on CALIBRA-
TION.For now,simplydepress the EXIT key.
In the SetupMode of operation the top row
of keysfunction asindicated bythe yellow
textlocated onthetopline oftextoneachof
the function keys.
4.1.3 Cell Mode
The CELL Keyallows you tochange the
cellconstant currently usedby the Mark 22
toany ofthree different,preset cellconstants
simply by pressing the appropriatefunction
keywhose cell constant value is labeled in
blue. Press the CELL key.The Mark22 will
respond with adisplay similar to the one pic-
tured below:
Tochange this cell constant, simplypress
oneof the functionkeys.Pressingafunction
keywhile inthe Cell Mode willchange the
Kfactor used tocalculate the raw and tem-
perature-compensatedconductivity mea-
surements. While the nominal cell constant
valueslisted on the function keysare0.01,
0.1, 1, and 10, youcanchange any of these
cell constantsto whatevervalue isdesired.
Refer toSection4.2on how to changeindi-
vidual cellconstants. Toreturntothe moni-
toring mode, pressthe CELL key again.In
the Cell Mode of operationthe top rowof
keys functioonas indicated bythe bluetext
located on the second line of text on eachof
the functionkeys. The K0.01Key selectsthe
cell constant for Cell#1,the K0.1Key se-
lects the cellconstant for Cell#2, the K1key
selects the cell constant for Cell #3 and the K
10Key selects the Cellconstant for Cell#4.
TheCellScreenappears as follows:
4.1.4 Data LogMode
IntheLogMode of operationthetop row
of keysfunction as indicated by the red text
locatedonthe third line of text on each of
thefunction keys.The FREE Key will dis-
play the amount ofstorage memory remain-
ing in terms of hours.The amount of data
stored is directly related to the scan rate used
duringthe logging operation.The PAUSE
Key will suspend the loggingfunction, and
the RESUMEKey will restart it. The CLEAR
Key will clear all of thelogged data from the
unit'sinternal memory.The LOG key is one
oftwo operationalmode keys onthe Mark
22 membrane panel outlined inRED. When
thelog Key is depressed, the function (la-
beled inred )on each of the function keys
becomes applicable.Afterthe LOG keyis de-
pressed, the Mark 22 will display the follow-
ingscreen:
CURRENT LOGFILE
ISFILE# 01
CELL #1CELL #2
CELL #3CELL #4
CURRENTCELL #1
ISK.01000

16
4-OPERATION
Martek Instruments, Inc.
Bypressingthe RESUME key,the Mark
22 willstart sending data to the printer.
Pressing the PAUSE key willstop the print-
ing. Pressing the RESUME key willresume
printing. Pressing the FREE key will show
how many scansor lines ofdataremain in
that particularfile. Finally,pressing the
CLEAR key willincrement the Mark 22to
the next file to beprinted.Toexit the print-
ing mode, simply pressthe PRINT key again.
Informationon how to set upyour computer
orprinterto communicatingwith the Mark
22canbefound in Section4.2.
4.2HOW TO SET UPTHE SYSTEM
This section describesthe operation of
the Mark 22in the Setup Mode.However,
the calibration procedures for temperature,
conductivity,andpHare extensive, so Chap-
ter5has been dedicated to the calibration of
the Mark 22. Theotherthreeoptions onthe
initialSetup Menu are COMP,CELL, and
LOG. Pressing the UP ARROW will move
theflashing display from CALtoCOMP,
from COMPto CELL,from CELLtoLOG,
and from LOG toCAL. The DOWNARROW
moves the flashingdisplayup through the
menu. When the desired operationis flash-
ing, presstheSELECTkey.Toreturn to the
Display Mode, pressEXIT.
08.64 ScpH
pH08.52 27.56°M
PRINTERREADY?
FILE# 01
Depress the LOG key toreturn to the to
the normaldisplaymonitoring mode. How-
ever,ablacksquare will be visiblein the top
right-hand corner of the displaysimilarto
the display shown below:
The BlackSquare indicatesthat the Mark
22is in the data LOG mode of operation.
Pressingthe FREE key will display the
amountof memory remainingfordatastor-
age in termsoflogging hoursremaining and
then returnto LogMode. The LOG mode
maybe paused by depressing the PAUSE
key.Loggingwillbesuspended until theRE-
SUME key isdepressed. The upper right cor-
nerof the display willshow aletter "p "in-
stead of the black square when the Mark 22
is in thepaused stateof the Log Mode.
Tostop logging, simply pressthe LOG
key again.Thenexttimeyou press the LOG
key,the Mark 22 will increment the internal
file counter and start logging data in the new
filenumber.This featureallows you to as-
sign differentfiles todifferent monitoring
points.Refer to Section 4.2on how to set up
theMark 22for logging atpredetermined
times and intervals.
4.1.5Print Mode
The PRINT key is identified byits RED
key legend. When thiskeyis depressed, the
thetoprow of function keysoperateas indi-
cated bytheRED legend locatedoneachkey.
The Mark22willalways send the displayed
data informationto the printerportunder
normalconditions.Pressing the PRINT key
will allow the Mark 22to printwhat hasbeen
stored in memorywhen itis hooked up toa
computer or printer.Pressing the PRINT key
willprovidethe following:
4.2.1Temperature Compensation
Formulas
Whenutilizing conductivity and pH sen-
sors inultrapure water,compensation formu-
lasfortemperatureandsample water impu-
rities must be considered sincesample