ORBECO SensoDirect pH 200 User manual

SensoDirect pH 200
pH-/Redox-/Temperature Meter
Operating instructions
%
°C
MEAS
HOLD
°F
°C

2

3
Table of Contents Page
1. Scope of delivery ..............................................................4
2. System description ............................................................4
3. Connections ......................................................................5
4. Display ..............................................................................7
5. Keypad .............................................................................7
6. Start up .............................................................................8
7. Measurement.....................................................................9
8. Configuration of the unit...................................................11
8.1 Selection of measuring function [pH] – [mV] – [Rel mV].....11
8.2 Calibration: selection of calibration...................................12
8.3 Display of electrode status ..............................................12
8.4 Selection of temperature unit °C /°F ................................14
8.5 Power off: automatic unit switch-off.................................14
9. Calibration of pH measurement........................................14
9.1 Starting calibration: Press [CAL] key ................................16
9.2 Selecting buffer solutions .................................................16
9.3 Calibration point 1: ‘CAL. 1’.............................................17
9.4 Calibration point 2: ‘CAL. 2’ ............................................18
9.5 Calibration point 3: ‘CAL. 3’.............................................20
10. Result memory ................................................................21
10.1 Storing results..................................................................21
10.2 Displaying stored results ..................................................21
10.3 Deleting stored results .....................................................22
11. Error messages and troubleshooting................................22
12. Technical data .................................................................25
13. Accessories .....................................................................27
14. Assembling Carrying strap ...............................................27

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1. Scope of delivery
Standard:
•Orbeco-HelligeSensoDirectpH200
•Batteries,4*AA1,5Vcells
•Operatinginstructions
•Carryingstrap
Set:
•Orbeco-HelligeSensoDirectpH200
•Batteries,4*AA1,5Vcells
•pH/Temperaturesensor
•Standardbuffersolutions,each90mlpH 
4.00/7.00/ 10.00
•Carryingcase
•Operatinginstructions
•Carryingstrap
2. System description
The system is a sturdy, water-tight handheld meter
designed for daily measurements in the area of field
or laboratory analysis.
It is used to measure redox voltage and temperature
in the field of environmental analysis as well as for
applications in the food and chemical industries.
The system complies with the requirements in EN
60529 relating to protection class IP67 and water-
proof/dustproof properties.

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The permanent protective plating on the unit serves not
just as impact protection but also as a storage com-
partment for the electrode and as an anti-slip device
when the meter is used in an upright position.
Microprocessortechnologyand4xAA1,5Vbatteries
allowunitoperationwithoutbatterychangefor15,000
hours or more.
A„LowBat”indicatorinthedisplayshowstheuser
when it is time to change the batteries.
The required temperature compensation for the system
is performed automatically (ATC) following connection
of a temperature sensor or via manual input via the
touch-sensitive film keypad. The unit automatically
identifies Pt1000 and NTC 30 kOhm sensors.
The AUTO HOLD feature enables the user to identify
stable results and call them up on the display.
The MEAS function is the standard continuous measu-
ring mode for pH levels or redox voltages.
pH calibration of the system is via an integrated auto-
matic buffer recognition feature.
The temperature characteristics of the Tintometer
standard buffer solutions and the reference buffer
solutions specified in DIN 19266 are stored in the unit
and are used for automatic calibration of the system
when selected.
It is additionally possible to enter some of the buffer
data into the unit manually.
Calibrationisperformedoptionallyat3points,2points
or 1 point.
A sensor evaluation is automatically shown in the
display (or can be called up via the menu) after each
calibration.
An internal memory for 20 results is integrated in the

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unitasstandard.Thememorystoreslocation,result
and temperature.
The memory is called up via the display.
3. Connections
 Temperature sensor “T”, 4mm
1-pin
 Temperaturesensor“REF”
and separately routed
 reference electrode, if present,
4mm 1-pin
 pHorredoxelectrode,HF
socket in acc. with DIN 19262
T REF
%
°C
mmHg hPa mg/l %O2
SAL OK CAL hPa
MEAS
HOLD
°F
°C
123
456
789
%
°C
pH
Rel mV
mV
AT C OK CAL
MEAS
HOLD
°F
°C
Meas Continuousmeasurement,
(standard setting)
Hold Auto Hold: automatic retaining
of stable result
on/off On/Off
[▲] [▼]Leafthroughmenuormemory,
manual temperature setting
Rcl Display of stored results
Cal Calibration mode
Store Storage of current
result or acceptance of
unit configuration
Menu Unit configuration
Main display: Result or user prompt
[mV] Redoxvoltage,absolute
[RelmV] Redoxvoltage,relativetothe  
hydrogen electrode (DIN 38404)
[pH] pH level
Secondary display: Result - temperature
or user prompt
[%] Percent (sensor evaluation)
[∆
!
] Warning index - battery/ one-point calibration
[°C,°F] Temperatureunit
[ATC] Automatic temperature compensation
[OK] Stable measuring signal
[CAL] Calibration mode
[MEAS] Measuring mode - standard
[HOLD] Measuring mode - AUTO-HOLD

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%
°C
pH
Rel mV
mV
ATC OK CAL
MEAS
HOLD °F
°C
Meas Cal
Hold Rcl Store
On
Off Menu
4. Display
5. Keypad
Meas Continuousmeasurement,
(standard setting)
Hold Auto Hold: automatic retaining
of stable result
on/off On/Off
[▲] [▼]Leafthroughmenuormemory,
manual temperature setting
Rcl Display of stored results
Cal Calibration mode
Store Storage of current
result or acceptance of
unit configuration
Menu Unit configuration
Main display: Result or user prompt
[mV] Redoxvoltage,absolute
[RelmV] Redoxvoltage,relativetothe  
hydrogen electrode (DIN 38404)
[pH] pH level
Secondary display: Result - temperature
or user prompt
[%] Percent (sensor evaluation)
[∆
!
] Warning index - battery/ one-point calibration
[°C,°F] Temperatureunit
[ATC] Automatic temperature compensation
[OK] Stable measuring signal
[CAL] Calibration mode
[MEAS] Measuring mode - standard
[HOLD] Measuring mode - AUTO-HOLD

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6. Start up
The unit is supplied with integrated batteries as stan-
dard and is therefore ready for immediate use.
You have to unscrew the unit to insert or change the
batteries.Wheninsertingthebatteries,ensurecorrect
polarity!
Screw the unit back together carefully without exerting
too much pressure on the gasket seal.
If the ∆
!
symbolappearstogetherwith“bAt”inthelower
sectionofthedisplay,thismeansthatthebatteriesare
nearly empty and need replacing.
However,theunitwillcontinuetofunctionforacertain
periodoftime.If“bAt”appearsintheuppersection
ofthedisplay,thismeansthatthebatteriesarecom-
pletely empty.
Displayed values in the event of cable break or if no
pH or redox electrode is connected:
If no electrode is connected or if the connecting cable
isdefective,thedisplaystillshowspHormVresults.
However,theseresultsarenotvalidresults!
Remove
6 screws
4 x AA 1,5 V
Don`t
touch
Display

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The electrode or temperature sensor must be plugged
in before the unit is switched on.
Switch the unit on via the [On/Off] key.
The system must be calibrated when the system is
started up (see Calibration).
Following measurement, please switch the unit off
using the [On/Off] key.
See the enclosed Operating Instructions for more
detailed information on storage and care of the elec-
trodes.
7. Measurement
Measuring mode MEAS
Aftertheunitisswitchedon,itisautomaticallyinthe
standard measuring mode MEAS.
You can switch to the standard MEAS measuring mode
by pressing the [Meas] key.
Thedisplayshowsthecurrent,possiblystilluctuating
resultandMEAS.Iftheresultisstable,the[ok]arrow
appears in the display.
Measuring mode HOLD
Pressing the [Hold] key takes you into the AUTO HOLD
measuring mode.
Inthismode,therecordedresultischeckedbythe
system in line with the predefined stability criteria until
these criteria are met.
The display shows Auto/Hold in alternating mode
together with the result.
On
Off
Meas
Hold

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Onceastablereproduciblevalueispresent,theresult
isshownpermanentlyinthedisplay(“frozen”).
The display also shows HOLD and the automatically
set or manually entered temperature.
Ifyoupressthe[Hold]keyagain,themeasuringcycle
starts anew and runs until the stability criteria are
met.
Temperature measurement, automatic temperature
compensation (ATC)
During pH measurement and redox measurement
(relativetothehydrogenelectrode[RelmV]),itisne-
cessary to compensate for the temperature effect of
the electrode.
If a temperature sensor is connected, temperature
compensation is performed automatically (ATC =
automatic temperature compensation).
The unit can automatically distinguish between a
Pt1000 and an NTC30kOhm temperature sensor.
The sensor type is displayed if you simultaneously
press the [Meas] and [Hold] keys.
Ifatemperaturesensorisnotconnected,youmust
manually enter the temperature of the medium to be
tested using the [▲] [▼]keys after switching on the unit
and confirm the value by pressing the [Store] key.
Duringthemeasurementprocess,youcanchangethe
temperature value at any time using the [▲] [▼]keys.
In the HOLD measuring mode, a new Auto Hold
measurement is started automatically every time a
change is made.
Hold
Hold
Meas
+