Lovibond SensoDirect 150 User manual

SensoDirect 150
MultiMeter Instrument - Instruction Manual
GB
pH/ORP DO
CD/TDS

22
Table of Contents
1. Specifications .................................................................................. 1
1.1 General Specifications .................................................................... 1
1.2 Electrical Specifications .................................................................. 2
2. Front Panel Description.................................................................. 5
3. pH/mV Measuring and Calibration
Procedure ........................................................................................ 7
4. Conductivity/TDS Measuring and
Calibration Procedure .................................................................. 13
5. DO (Dissolved Oxygen) Measuring
and Calibration Procedure ........................................................... 18
6. Data Load, Data Record, Data Logger ........................................ 24
7. Advanced Adjustment Procedure................................................ 26
7.1 Check Memory Space ................................................................... 27
7.2 Clear Memory ............................................................................... 27
7.3 Date/Time Setting......................................................................... 27
7.4 Sample Time Setting..................................................................... 27
7.5 Auto Power Off Default Setting.................................................. 28
7.6 Temp. Unit Default Setting .......................................................... 28
7.7 pH Manual Temp. Value Setting.................................................. 28
7.8 CD Temp. Compensation Factor Setting...................................... 28
7.9 CD ( µS, mS ), TDS ( ppm ) Setting ............................................... 29
7.10 DO % Salt Compensation Value Setting ..................................... 29
7.11 DO Height (Altitude) Compensation Value Setting ................... 30
7.12 Escape from the Setting function................................................ 30
8. Data Output.................................................................................. 31
9. RS232 PC Serial Interface.............................................................. 33
10. Battery Replacement .................................................................... 35
11. System Reset ................................................................................. 35
11. Optional Accessories..................................................................... 36

1
1. Specifications
1.1 General Specifications
Circuit Custom microprocessor LSI
Display LCD size : 58 mm x 34 mm.
Measurement pH / Oxidation Reduction Potential (ORP)
Conductivity/Total Dissolved Solids (TDS)
Dissolved Oxygen (DO)
Temperature
Sampling Time of Data Log-
ger
1 second to 8 hours 59 minutes and
59 seconds
Data Hold Freeze the display reading.
Memory Recall Maximum and Minimum value
Power off •Auto shut off saves battery life; manual
shutoffpossiblebypressing“Power”button
for 2 seconds
•Default changeable: auto power off/
manual power off
•Withdefaultsetatautopoweroff,power
will off automatically after 10 minutes if no
buttonispressed.
Display lapse time Approx.1second.
Data Output RS 232 PC serial interface
Operating Temperature 0 to 50 °C (32 to 122°F) for the instrument
(notincludingprobes)
Operating Humidity Less than 80% rel. humidity
Power Supply •DC1.5Vwith4batteries(mignonsize;
TypeAA)
•DC9Vbyadapterinput
Power Current •Operation:approx.DC28mA
•Clock(poweroff):approx.DC1µA

2
Weight •instrument390g(batteriesincluded)
•withprotectivecovering620g
Dimension instrument:203x76x38mm•
with protective covering: approx.•
220 x 125 x 45 mm
1.2 Electrical Specifications (23± 5°C)
A. pH/mV
Measurement pH 0 to 14 pH
mV -1999mVto1999mV
Input Impedance 1012 ohm
Temperature Compensation
for pH measurement
Manual 0 to 100°C
(32 to 212°F)
Automatic(ATC) 0to65°C
(32 to 149 °F) with tem-
peratureprobe
pHCalibration 1to3pointcalibrationusing
pH7/pH4/pH10buffersolutions
Threepointcalibrationensuresbestlinearity
and accuracy
Measurement Range Resolution Accuracy
pH 0 to 14 pH 0.01 pH ± (0.02 pH + 2 digits)
mV -1999to1999mV 1mV ± (0.5 % pH + 2 digits)
*pHaccuracyisbasedoncalibratedmeteronly.

3
B. Conductivity
Conductivityprobe Carbon rod electrode for long
life
Function •Conduction(µS,mS)
•TotalDissolvedSolids(ppm)
•Temperature(°C,°F)
Temperature Compensation Automatic from 0 to 60°C
(32–140°F),
with temperature compensa-
tion factor variable between
0 to 5 % per °C
ProbeOperatingTemperature 0to60°C(32to140°F)
ProbeDimension Round, 22 mm diameter x
120 mm length
ProbeWeight approx.65g
Range Measurement Resolution Accuracy
200µS 0to200.0µS/cm 0.1µS/cm ± (2 % F.S.
+ 1 digit)
2 mS 0.2 to 2.000 mS / cm 0.001 mS / cm
20 mS 2 to 20.00 mS / cm 0.01 mS / cm
200 mS 20 to 200.0 mS / cm 0.1 mS / cm
F.S. = Full Scale

4
C. TDS (Total Dissolved Solids)
Range Measurement Resolution Accuracy
200 ppm 0 to 132 ppm 0.1 ppm ± (2 % F.S. +
1 digit)
2,000ppm 132to1,320ppm 1 ppm
20,000ppm 1,320to13,200ppm 10 ppm
200,000ppm 13,200to132,000ppm 100 ppm
F.S. = Full Scale
D. Temperature
Function Measurement Resolution Accuracy
°C 0°Cto60°C 0.1°C ± 0.8°C
°F 32°F to 140°F 0.1°F ± 1.5°F
E. Dissolved oxygen
OxygenProbe Polarographictypeoxygenprobe
ProbeCompensation
andAdjustment
Temperature 0to50°C,automatic,
(3 to 122 °F)
Salt 0 to 39 % Salt
Height 0 to 8900 meter
ProbeWeight approx. 195 g
ProbeSize Round,190mmlengthx28mmdiameter
Measurement Range Resolution Accuracy(23±5°C)
Dissolved Oxygen 0 to 20.0 mg/L 0.1 mg/L O2± 0.4 mg/L O2
OxygeninAir 0 to 100 % 0.1 % O2± 0.7 % O2

5
2. Front Panel Description (Fig. A)
A-1 Display
A-2 Power Button
A-3 REC Button (Enter Button)
A-4 HOLD Button (ESC Button)
A-5 Mode Button ( Up Button, Zero Button)
A-6 Function Button (Range Button, Down Button)
A-7 Send Button (Clock Button)
A-8 SET Button (Logger Button)
A-9 Stand
A-10 Battery Compartment Cover
A-11 Battery Cover Screw
A-12 Tripod Fix Nut
A-13 Temp. Socket (pH ATC Socket)
A-14 CD Socket
A-15 DO Socket
A-16 pH Socket (BNC Socket)
A-2
A-3
A-4
A-5
A-6
A-7
A-8
A-1
A-15
A-14
A-13
A-16
A-12
A-9
A-11
A-10

6
A-17 DC 9V Power Adapter Input Socket
A-18 RS-232 Output Terminal
A-19 System Reset Button
A-20 LCD Brightness Adjust
Attention:
Please do not put more than one electrode only into the water
sample when using an instrument that
works with various electrodes.
Only start the measurement for which the according electrode
is immersed in the sample.
A-17 A-18 A-19 A-20
DC IN
RS232
RESET

7
3. pH/mV Measuring and Calibration Procedure
Display layout
MeasurementValue
PH
Manual Temp.
25.0 °C
Temp. value Temp unit
pH
or
mV
Manual Temp. or
AutoTemp.
10.00
The meter default settings are as follows:
•The display unit is set to pH.
• The temperature unit is set to °C.
• Manual temperature setting (without ATC probe
connection)
• Auto power off.
• Data logger function sampling time: 2 seconds.

8
3.1 pH measurement (with manual temperature setting)
1)AttachthepHElectrodebyinstallingthe“ProbePlug“
 (Fig.B-1)intothe“pHSocket/BNCSocket“(Page5,Fig.A-16).
2)Poweronthemeterbypressingthe“Power”buttononce.
3)Keeppressingthe“Mode”buttonuntilthedisplayofbottom
 rightshows“pH“and“ManualTemp.“indicator.
4) Adjust the Manual Temp. value exactly to the same
temperature
as the solution. For procedure refer to chapter
7.7, page 28.
5)RemovecapandholdthepHElectrodebody(Fig.B-2)andcom-
 pletelyimmersethe“SensingHead“(Fig.B-3)inthesolutionto
 bemeasuredandgentlyswirltheprobe.
6)TheupperdisplaywillshowthepHvalue,thebottomleftdisplay
will show the Manual Temp. setting.
Fig. B
B-1
B-2
B-3
B-4

9
3.2 pH measurement (with ATC , automatic Temperature
Compensation)
1)Alltheproceduresarethesameasfor3.1“pHmeasurement
 (manualtemperaturesetting)“,exceptforattachmentofa
 temperatureprobebyinsertingtheplugofthetemperature 
 probeintothe“Temp.Socket“(Page5,Fig.A-13),andimmers-
 ingthesensingheadofthetemperatureprobeintothemeasure-
ment solution.
2)TheupperdisplaywillshowthepHvalue,thebottomleft
 displaywillshowtheTemp.valueofthemeasuredsolution,and
thebottomrightdisplaywillshow“AutoTemp.“asexamplebelow:
When not in use the “Electrode Sensing Head“ (Page 8, Fig.
B-3) should always be immersed in water by part-filling
the probe cap, (Page 8, Fig. B-4) and ensuring that the cap
is firmly lifted onto the probe. Failure to do so will reduce
probe life.
3.3 mV Measurement
TheinstrumenthasabuiltinmV(millivolt)measurementfunction,
whichenablesyoutomakeion-selective,ORP(oxidationreduction
potential),andotherprecisemVmeasurements.
1)AttachtheORPElectrodebyinstallingthe“ProbePlug“ofthe
ORPelectrodeintothe“pHSocket/BNCSocket“(Page5,Fig.A-16).
2)Poweronthemeterbypressingthe“Power”buttononce.
3)Keeppressingthe“Mode”buttonuntilthedisplayatbottom
 rightshows“PH“and“ManualTemp.“indicator.
PH
Auto Temp.
25.0 °C
7.01

10
Press the “Function” button once so that the bottom right
display shows “mV“ .
4)TheupperdisplaywillshowthemVvalue.
3.4 pH calibration
Calibration - Introduction
An“ideal”pHElectrodegenerates0mVatpH7.00(177.4mVat
pH4).Themeterhasbeencalibratedwithsignalswhichsimulate
the“ideal”pHElectrode(basedon25°Cambientenvironment).
HowevernoteverypHElectrodeisasaccurateasthe“ideal”one,
socalibrationproceduresarenecessarybeforersttimemeasure-
ment.Inadditiontocalibrationbeforersttimemeasurement,us-
ersarealsorecommendedtocarryoutregularcalibrationtoensure
high accuracy measurements.
Required Equipment for Calibration
1)pHElectrode.
2)pHbuffersolutions.
Calibration Procedure
1)AttachthepHElectrodebyinstallingthe“ProbePlug“(Page8,
 Fig.B-1)intothe“pHSocket/BNCSocket“(Page5,Fig.A-16).
2)Poweronthemeter,setthemodetopHmeasurement,andthe
 bottomrightdisplaywillshow“PH“.
3)Adjustthe“TemperatureCompensationValue“tomakeitthe 
 sametemperatureasthepHbuffersolution.
• Manual temperature compensation value adjustment
procedure, refer to 7-7, page 28.
• Automatic temperature compensation, refer to 3.2,
Page 9.
4)Holdthe“pHElectrodebody“(Page8,Fig.B-2)andcompletely
 immersethe“SensingHead“(Page8,Fig.B-3)inthebuffersolu-
tionandgentlyswirltheprobe.ThedisplaywillshowthepHvalue.

11
5)Pressthe“REC”buttonand“HOLD”buttonatthesametime.
 Thedisplaywillshowthefollowingscreenasanexample.Now
release.
6)• IfthebuffersolutionispH7.0(±1pH),theupperdisplaywill
show 7.00 automatically.
 • IfthebuffersolutionispH4.0(±1pH),theupperdisplaywill
show 4.00 automatically.
 • IfthebuffersolutionispH10.0(±1pH),theupperdisplay
will show 10.00 automatically.
 • IfthebuffersolutionvalueisbeyondpH7.00,pH4.00,
  pH10.00(forexample7.01,4.02,10.03)thenuse
 “
”button,“ ”buttontoadjustthedisplayvaluetoexactly
  matchthepHbuffersolutionvalue.
7)Pressthe“Enter”buttontwicetosavethecalibrationdataand
 nishthecalibrationprocedure.
8)Thedescribedprocedurecanbeperformedforthefollowing 
 calibrationpoints:
pH7 calibration
pH4 calibration
pH10 calibration
•CalibrationshouldalwaysstartwithpH7,followedbypH4and/
 orpH10calibration.
•Rinsetheelectrodewithdistilledwaterbeforeeachcalibration
point.
PH CAL.
^, v Enter : Y
23.5 °C
7.00

12
•Repeattheabovecalibrationproceduresatleasttwicetoensure
accuracy.
3.5 ORP calibration
1)AttachtheORPelectrode(optional,ORP-14)byconnectingthe
ORP electrode to the meter.
2)Poweronthemeter,andsetthemodeandfunctionto“mV“ 
 (refertochapter3.3,Page9).
3) Immerse the sensing head of the ORP electrode in the ORP
 standardbuffersolution.TheupperdisplaywillshowtheORP
 valueinmV.
4)Pressthe“REC”buttonand“HOLD”buttonatthesametime.
 Thedisplaywillshowthefollowingscreenasanexample.Now
release.
5)Use“ ”button,“ ”buttontoadjusttheupperdisplayvalueto
 exactlymatchtheORPbuffersolutionvalue.Pressthe“Enter”
 buttontwicetosavethecalibrationdataandnishthecalibra-
tion procedure.
• ORP calibration is only possible if the ORP buffer solution
value is > 100 mV.
• ORP calibration at less than 100 mV is not permitted.
mV
Adjust
201
235
Aiv

13
4. Conductivity/TDS Measuring and Calibration Procedure
Display layout MeasurementValue
200.0 µS
Auto Range
24.2 °C
Temp. value Temp unit AutoorManual
range
19.00
The meter default settings are as follows:
•Thedisplayunitissettoconductivity(µS,mS).
•Thetemperatureunitissetto°C.
•Temp.compensationfactorissetto2.0%per°C.
•Autorange.
•Autopoweroff.
•Dataloggerfunctionsamplingtime:
2 seconds.
Range
scale

14
4.1 µS, mS measurement
1)AttachtheConductivityProbebyinstallingthe“ProbePlug“
 (Fig.C-1)intothe“CDSocket“(Page5,Fig.A-14).
2)Poweronthemeterbypressing“Power”buttononce.
3)Keeppressingthe“Mode”buttonuntilthebottomrightdisplay
 showsavalue(e.g.“200mS“)and“AutoRange“.
4)Removeprobecapandholdtheprobebody(Fig.C-2)andcom-
 pletelyimmersethe“SensingHead“(Fig.C-3)inthesolutionto
 bemeasured.Swirltheprobetoletanyairbubbleescapefrom
the sensing head.
5)Thedisplaywillshowtheconductivityvaluesineither“mS/cm”
 or“µS/cm”.Atthesametimethebottomleftdisplaywillshow
the Temp. value of the measured solution.
Fig. C
C-1
C-2
C-3

15
Manual range operation
The meter default is set to auto range mode. Under auto range
measurement,thebottomrightdisplaywillshowthe“Auto
Range“indicator.Ifmanualrangemodeisrequired,theprocedures
are as follows:
1)Pressthe“Range”buttoncontinuouslyforatleasttwoseconds
 untilthebottomrightdisplayshowsthe“ManualRange“indica-
 tor.Releasethe“Range”button.Nowthemeterissetformanual
range operation.
2)Pressthe“Range”buttononcetochangetherange.Therange
 (200µS,2mS,20mS,200mS)willshowunderthemeasure- 
ment value.
3)• Ifthedisplayshows“ ---- “,itindicatesanoverrange.
  Selectthenext,higherrange.
 • Ifthedisplayshows“ ----“,itindicatesanunderrange. 
  Selectthenext,lowerrange.
4)TochangeManualRangebacktoAutoRange,pressthe 
 “Range”buttoncontinuouslyforatleasttwosecondsuntilthe
 bottomrightdisplayshowsthe“AutoRange“Indicator.Release
 the“Range”button.NowthemeterissetforAutorangemode
again.
Change the Temp. unit to °F
TochangetheTemp.unitfrom°Cto°F,pleaserefertopage28,
chapter7.6(Temp.UnitDefaultSetting)
Change the Temp. Coefficient Factor
The default Temp. compensation factor value of the measurement
solutionissetto2.0%per°C.Tochangeit,pleaserefertopage
28,chapter7.8(Temp.CompensationFactorSetting).

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4.2 TDS (ppm) measurement
Measuringproceduresarethesameasabove4.1 Conductivity (µS,
mS) measurement,exceptforchangingthedisplayunitfromµS,
mStoppm.Fordetailedprocedurespleaserefertopage29,chap-
ter7.9CD(µS,mS),TDS(ppm)Setting.
4.3 Calibration
1)Obtainathestandardconductivitysolution:
For example :
 • 2mSrangecalibrationsolution:
1.413 mS Conductivity Standard Solution
 • 200µSrangecalibrationsolution:
80 µS Conductivity Standard Solution
 • 20mSrangecalibrationsolution:
12.88 mS Conductivity Standard Solution
or other Conductivity Standard Solution
2)Installthe“ProbePlug“(Page14Fig.C-1)intothe“CDSocket“
 (Page5,Fig.A-14).
3)Poweronthemeter,andsetthemodetoconductivity
 measurement(µS,mS).
4)Holdtheprobebody(Page14,Fig.C-2)andcompletelyimmerse
 “SensingHead“(Page14,Fig.C-3)inthestandardsolution.
 Swirltheprobetoletanyairbubbleescapefromthesensing 
head. The display will show the conductivity mS ( mS ) values.
5)Pressthe“REC”buttonand“HOLD”buttonatthesametime.
 Thedisplaywillshowthefollowingscreen,asanexample.Now
release.

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6)Use“ ”button(Page5,Fig.A-5),“ ”buttontoadjustthe
upper display value to match the standard conductivity value.
7)Pressthe“Enter”buttontwicetosavethecalibration 
 data,andnishthecalibrationprocedure.
• If only one calibration point is needed, just set the 2 mS
range (1.413 mS Cal.).
• A multi-point calibration procedure should always start
with 2 mS range (1.413 mS Cal.), then proceed to other
ranges (20 µS range, 20 mS range or 200 mS range) if
necessary.
CD CAL.
^, v ENTER: Y
23.5 °C
1.413

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Display layout MeasurementValue
% O2
24.2 °C
Temp. value Temp unit Temp. unit
% O2or mg/L
20.9
5. DO (Dissolved Oxygen) Measuring and Calibration
Procedure
ATTENTION: Make sure the Oxygen probe is filled with Elec-
trolyte!
To fill the Probe‘s Electrolyte, refer to chapter 5.3 “Probe
maintenance“, page 22.
The meter default settings are as follows:
 •Thedisplayunitissetto%O2.
 •Thetemperatureunitissetto°C.
 •Autopoweroff.
 •Dataloggersamplingtime:2seconds.