iSTEK NeoMet 79P User manual

NeoMet
Portable pH/ISE/mV/ORP, DO/O2/Air,
Conductivity/TDS/Salinity/Temp Meter
Model 79P
29D
47C
415CP
815PDC
Instruction Manual
istek, Inc.

2
NeoMet
TABLE OF CONTENTS
CHAPTER I. INTRODUCTION.........................................................................................................4
pH/ISE/mV/ORP/TEMP Meter..............................................................................................4
DO/O2/Air/TEMP Meter........................................................................................................4
Conductivity/TDS/Salinity/TEMP Meter ...............................................................................5
815PDC ................................................................................................................................5
CHAPTER II. INSTRUMENT SETUP ...............................................................................................7
CHAPTER III. GENERAL FUNCTIONS...........................................................................................8
Keypad Functions..................................................................................................................8
pH/ISE/mV/ORP ...............................................................................................................8
DO/O2/Air .........................................................................................................................9
Conductivity/TDS/Salinity...............................................................................................10
Display Description.............................................................................................................11
Electrode Structure and Storage...........................................................................................13
General pH Combination Electrode..................................................................................13
pH Electrode Storage.......................................................................................................13
pH Electrode Maintenance (Electrode Cleaning) ..............................................................13
DO Polarographic Probe Structure ...................................................................................14
DO Probe Storage............................................................................................................14
DO Probe Maintenance (Probe Cleaning).........................................................................14
Conductivity Cell Storage................................................................................................14
Conductivity Cell Maintenance (Cell Cleaning)................................................................14
CHAPTER IV. SETUPFUNCTIONS................................................................................................15
pH/ISE/mV/ORP/TEMP Meter............................................................................................15
pH Mode..........................................................................................................................15
ISE Mode Setup...............................................................................................................16
DO/O2/Air/TEMP Meter......................................................................................................16
DO Mode Setup...............................................................................................................16
Conductivity/TDS/Salinity/TEMP Meter .............................................................................17
Conductivity Mode Setup.................................................................................................17
TDS Mode Setup .............................................................................................................20
Clear data(memory).............................................................................................................20
CHAPTER V. CALIBRATION AND MEASUREMENT..................................................................21
pH/ISE/mV/ORP/TEMP Meter............................................................................................21
pH Calibration and Measurement.....................................................................................21
ISE Calibration and Measurement....................................................................................25
Slope Feature & Functions...............................................................................................27
Millivolt / Relative Millivolt Measurement.......................................................................27
Table of Contents

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DO/O2/Air/TEMP Meter......................................................................................................29
Calibration and Measurement...........................................................................................29
- DO Calibration and Measurement...............................................................................29
- O2Calibration and Measurement................................................................................31
-Air Calibration and Measurement ...............................................................................32
Conductivity/TDS/Salinity/TEMP Meter .............................................................................33
Calibration and Measurement...........................................................................................33
- Salinity Mode ?..........................................................................................................34
CHAPTER VI. DATA-LOG...............................................................................................................35
Memory Data-Log...............................................................................................................35
CHAPTER VII. TROUBLESHOOTING & ERROR DESCRIPTION ............................................36
pH/ISE/mV/ORP/TEMP Meter............................................................................................36
DO/O2/Air/TEMP Meter......................................................................................................37
Conductivity/TDS/Salinity/TEMP Meter .............................................................................38
CHAPTER VIII. SPECIFICATIONS................................................................................................39
ISE Specifications ...............................................................................................................40
CHAPTER IX. ORDERINGINFORMATION.................................................................................41
Table of Contents

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NeoMet
Chapter I. Introduction
This meter is operated by battery(DC 9V) and is controlled by microprocessor for all
measurement needs.
This meter features a custom LCD that simultaneously displays various functions along
with measurement results. istek's instrument is high-performance for accurate
measurement of wastewater and use at laboratory and its operation is simply designed
in the position of user.
This model is capable of storing up to 50 points in memory at once for each items.
pH/ISE/mV/ORP/TEMP Meter
If pH reading is stable, ¡S(Stable)¡ is displayed in the left field, therefore measure
accurately since user can easily know a stable value.
This model is a pH meter which features auto calibration and manual calibration
simultaneously(3 points).
This model displays pH, ISE, mV, ORP(relative millivolt) and ATC(C).
pH indicates power of hydrogen(H+). (unit pH)
pH = -log10[H+]
ISE indicates concentration of any given ion.(unit mg/L) To measure an ion must
use electrodes which according to the type of ion, selectively response to only
any given ion.
mV indicates electromotive force of each ion. (unit mV)
ORP indicates a relative potential. (unit mV)
ATC For automatic temperature compensation, a temperature probe supplied by
istek must be used.
Temperature Compensation is automatically performed while measuring.
DO/O2/Air/TEMP Meter
This model features to obtain a reliable data since its program is treated by setting in
detail about compensation factor(altitude and salinity) for an accurate measurement.
This model displays DO, O2, air and ATC(C).
DO indicates concentration of oxygen presents in the water. (unit mg/L)
Chapter I Introduction

5
7.00
ATC 25.0 C
pH
NeoMet
O2indicates percentage of oxygen as compared to the amount of oxygen
presents in the air. (unit %)
Air indicates percentage of DO or O2 concentration. (unit %)
ATC For automatic Temperature Compensation, a temperature probe supplied by
istek must be used. Temperature Compensation is automatically performed
while measuring.
Conductivity/TDS/Salinity/TEMP Meter
This model features to obtain a reliable data since its program is treated by setting in
detail about compensation factor(Temperature Compensation Coefficient, Cell
Constant, etc) for an accurate measurement.
This model displays Conductivity(S, mS), TDS(mg/L), Salinity(ppt) and ATC(C).
Conductivity indicates conductivity of solution. (unit S/cm and mS/cm)
TDS indicates by converting the measured conductivity into concentration of the
total dissolved solid present solution from. (unit mg/L)
Salinity indicates by converting the measured conductivity into salinity of solution.
(unit ppt)
ATC For automatic temperature compensation, a temperature probe supplied by
istek must be used.
Temperature is automatically compensated on the base of Tref adjusted in
Setup. Tref indicates compensation temperature. Tref can be set with 25.0℃
or 20.0℃for a basis.
815PDC
This meter features to measure pH, ISE, mV, ORP, DO, O2, Air, Conductivity, TDS,
Salinity and Temp, and automatically select a measuring mode by connection electrode.
If connecting pH electrode, the displays is shown as follows.
Chapter I Introduction
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0.0
mg/L
ATC 25.0 C
DO
0.0
ppt
ATC 25.0 C
COND
If connecting DO probe, the displays is shown as follows
If Connecting Conductivity Cell, the displays is shown as follows
Chapter I Introduction
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Chapter II. Instrument Setup
Top Panel
Electrode and ATC probe connection
Attach the electrode probe with ATC probe to the DIN jack by sliding the connector
straight on until firmly in place.
RS232C Interface Cable Connection
Insert RS232C interface cable into the RS232C jack. Use interface cable supplied by
istek.
Power Source
Use 1.2V rechargeable battery / DC power adapter
If the message as ¡BAT¡ is displayed, replace battery.
Chapter II Instrument Setup
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Ready
Measur
-
e
Mode
Setup Select
Memo
-ry Rel-mV

Out Slope

Resolu
-tion
Cal
Off
On
Chapter III. General Functions
Keypad Functions
pH/ISE/mV/ORP
Key Functions
Power used to turn ON/OFF.
Cal used to start and set calibration,
In addition, exit in the middle of
calibration.
Ready/measure used to change condition of meter
i.e. measure or ready.
This is used for changing from ready
to measure condition or reversing.
Mode used to change operating modes, such
as pH, mV or ISE.
Resolution used to change the resolution.
For pH choose 0.1, 0.01 or 0.001.
Setup used to access the setup menu.
This is used for setting instrument
operating parameter for example,
Temperature and Data logging in
pH Setup, and Ion Buffer in ISE Setup.
Select used to select the standard solution in ISE setup.
used to erase the memorized data.
Memory used to store data in meter memory while measuring.
In the ready condition, used to search to the memorized data.
Slope indicates slope after pH or ISE calibration.
Out used to exit in setup mode.
up() In setup, calibration and Data(Memory) mode, press to increase
value.
down() In setup, calibration and Data(Memory) mode, press to decrease
value.
Chapter III General Functions
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Ready
Measur
-
e
Cal
Mode
Setup Select
Memo
-ry

Out

Resolu
-tion
Off
On
DO/O2/Air
Key Functions
Power used to turn ON/OFF.
Cal used to start and set calibration,
In addition, exit in the middle of
calibration.
Ready/measure used to change condition of meter
i.e. measure or ready.
This is used for changing from ready
to measure condition or reversing.
Mode used to change operating modes, such
as DO, O2or Air.
Resolution used to change the resolution.
For DO choose 0.1 or 0.01.
Setup used to access the setup menu.
This is used for setting instrument
operating parameter for example,
altitude, salinity, temperature and Data
logging in DO mode.
Select used to erase the memorized data.
Memory used to store data in meter memory while measuring.
In the ready condition, used to search to the memorized data.
Out used to exit in setup mode.
up() In setup, calibration and Data(Memory) mode, press to increase
value.
down() In setup, calibration and Data(Memory) mode, press to decrease
value.
Chapter III General Functions
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Ready
Measur
-
e
Cal
Mode
Setup Select
Memo
-ry

Out

Resolu
-tion
Off
On
Conductivity/TDS/Salinity
Key Functions
Power used to turn ON/OFF.
Cal used to start and set calibration,
In addition, exit in the middle of
calibration.
Ready/measure used to change condition of meter
i.e. measure or ready.
This is used for changing from ready
to measure condition or reversing.
Mode used to change operating modes, such
as Conductivity, TDS and Salinity.
Resolution used to change the resolution.
For Conductivity choose 0.1 or
0.01(auto-range).
Setup used to access the setup menu.
This is used for setting instrument
operating parameter for example,
temperature compensation coefficient,
cell constant,
compensation temperature,
standard solution, temperature and
Data logging in conductivity mode,
and TDS factor in TDS mode.
Select used to erase the memorized data.
used to select the standard solution in Setup.
Memory used to store data in meter memory while measuring.
In the ready condition, it used to search to the memorized data.
Out used to exit in setup mode.
up() In setup, calibration and Data(Memory) mode, press to increase
value.
down() In setup, calibration and Data(Memory) mode, press to decrease
value.
Chapter III General Functions
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Display Description
pH/ISE/mV/ORP/TEMP DO/O2/Air/TEMP Conductivity/TDS/Salinity/TEMP
Common Display
Display Function
ATC displays when a temperature probe is attached, and indicates automatic
temperature compensation.
MEAS indicates that meter is in measurement mode.
If this is not shown, indicates ready condition.
SETUP indicates that meter is in setup mode.
CAL indicates that meter is in calibration condition.
used to calibration.
CAL 1 OK indicates the end of calibration corresponding to number.
DATA 1 indicates number of data stored in meter.
Err(Error) displays when it is not available to correctly measure because
something is wrong in the meter or buffer while calibrating or
measuring.
BAT displays when the battery is low and needs to be replaced.
pH/ISE/mV/ORP/TEMP Meter
Display Function
S indicates slope value.
If pH reading is stable, displays in the left field.
Chapter III General Functions
NeoMet
BAT SETUP MEAS
CAL 1 OK
DATA 01
S7.09
ATC 25.0 C
mV pH ISE
%
BAT SETUP MEAS
CAL 1 OK
DATA 01
8.21
ALT ppt mg/L
ATC 25.0 C
Air
DO O2
BAT SETUP MEAS
CAL 1 OK
DATA 01
146.9
SmS ppt mg/L
ATC 25.0 C
COND TDS Sal

12
Display Function
pH When the pH mode is chosen, ¡pH¡ is displayed below main field.
displays power of hydrogen with range of ?2.000 to 19.999 pH.
ISE indicates ISE mode.
mV indicates mV mode.
displays electromotive force.
DO/O2/Air/TEMP Meter
Display Function
DO When the DO mode is chosen, ¡DO¡ is displayed below main field.
displays concentration of dissolved oxygen with range of 0.00 to
19.99 mg/L.
O2indicates O2mode.
indicates percentage of oxygen as compared to the amount of
oxygen presents in the air.
AIR INDICATES AIR MODE.
indicates percentage of DO concentration.
ALT displays in altitude setup.
ppt displays in salinity setup.
Conductivity/TDS/Salinity Meter
Display Function
COND When the conductivity mode is chosen, ¡COND¡ is displayed below
main field.
indicates conductivity with range of 0 ~199,999 S/cm.
TDS indicates TDS mode.
indicates the amount of total dissolved solids presents in solution.
(unit mg/L)
Salinity indicates salinity mode
indicates salinity presents in solution at a current temperature.
(unit ppt)
S(mS) indicates conductivity unit.
Chapter III General Functions
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Electrode Structure and Storage
General pH Combination Electrode
1. Reference Filling Hole ; hole filling electrode with the
filling solution
2. Ag/AgCl or calomel electrode ; Reference Electrode
3. pH mono electrode ; indicator electrode
4. Temperature sensor
5. Reference Filling Solution ; Saturated KCl Solution
6. Glass Membrane ; membrane selectively responding
hydrogen ion
pH Electrode Storage
Electrodes are stored in the cap storage solution supplied by istek.
Membrane must be kept wet. If there is no storage solution, pH 4 buffer is best for the
single glass electrode and saturated KCl is preferred for a calomel and Ag/AgCl
reference electrode. Saturated KCl is the preferred solution for a combination electrode.
Electrodes are sometimes stored in distilled water, but this method causes electrode life
to decrease.
pH Electrode Maintenance (Electrode Cleaning)
If it takes long time to response or a stable data isn¡t obtained, can often be restored to
normal performance by one of the following procedures;
Glass electrodes fail because of scratches, deterioration or accumulation of debris on
the glass surface.
- Salt deposits Recover electrode by alternately immersing it three
times each in 0.1N HCl and 0.1N NaOH for approx.
five minutes. If this fails, immerse tip in KCl
solution for 30s. After recovery, soak in pH 7.00
buffer overnight. Rinse and soak in pH 7.00 buffer.
Rinse again with distilled water before use.
- Oil/Grease films Remove oil/Grease films with detergent, and then
rinse electrode with distilled water.
- Clogged Reference Junction Heat diluted KCl solution to about 60 ~ 80 C.
The electrode must be stored in this solution for
approx. ten minutes, then cool electrode in not
heated KCl solution.
- Protein removal Protein coatings can be removed by soaking glass
electrodes in a 10% pepsin solution adjusted to pH 1
to 2.
Chapter III General Functions
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DO Polarographic Probe Structure
1 2 3 4 5 6 7
1. Electrode Body
2. Temperature Sensor
3. Screw
4. Sensor; position of response to oxygen
5. Membrane
6. Membrane Cover ;
containing with the filling Solution
7. Membrane Protector
DO Probe Storage
For longer storage, cover the membrane tip with a cap originally supplied by istek.
DO Probe Maintenance (Probe Cleaning)
If it takes long time to response or a stable data isn't obtained, check membrane.
If air bubble is occurred on membrane, remove air bubble.
Check membrane for damage(i.e. holes and leak, etc.). If membrane gets damage, replace
membrane.
Conductivity Cell Storage
A dirty cell will contaminate the solution and cause conductivity to change. It is best to
store cells that are immersed in deionized water. Provided the cell has been stored in
condition of drying, should be soaked in distilled water for five to ten minutes before
using to keep electrode wet.
Conductivity Cell Maintenance (Cell Cleaning)
Glease, oil, fingerprints, and other contaminants on the sensing elements can cause
erroneous measurements and sporadic responses.
If it takes long time to response or a stable data isn't obtained, can be often restored to
normal performance by using the following procedures;
Clean cells with detergent and/or dilute nitric acid(1%) by dipping or filling the cell
with cleaning solution and agitating for two or three minutes. Other diluted acids(e.g.
sulfuric, hydrochloric, chromic) may be used for cleaning except for aqua regia. When
a stronger cleaning solution is required, try concentrated hydrochloric acid mixed into
50% isopropanol.
Chapter III General Functions
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Chapter IV. Setup Functions
The setup menu is used to identify and change instrument parameters.
pH/ISE/mV/ORP/TEMP Meter
pH Mode
Data Log Setup
In pH ready condition if pressing Setup key to enter the setup, the display is shown as
follows.
Set by using or key
When this setup is set ¡on¡, meter transmits data with time
interval of one second.
This data can be taken by communication program or printer
via RS232C interface cable.
When pH is 7.00 and temperature is 25.0C, the following
figure is an example to print.
Temperature Setup
If temperature on display differs from a real temperature, set
a real temperature.
Set temperature by using or key.
If finishing setup, press Setup or Out key to return to pH
initial display.
Chapter IV Setup Functions
NeoMet
SETUP
DATA
oFF
SETUP
25.0 C
pH 7.00 25.0

16
ISE Mode Setup
Standard Solution Setup
In pH ready condition press Mode key to enter ISE mode. In
ISE ready condition if pressing Setup key, the display is
shown as follows.
If pressing Select key, concentration of buffer (1.0010-2,
1.00100, 1.00101, 1.00102, 1.00103) is played in turn
and then set buffer by using Memory key. It is available to
set buffer up to 5 points. Please note that it is not available to
set just only 1 point.
If finishing setup, press Out key exit setup mode.
DO/O2/Air/TEMP Meter
DO Mode Setup
Altitude
In the initial display of DO, press Setup key to enter Setup and then the display is
shown as follows. Adjust altitude with or key.
The set altitude is automatically compensated.
If finishing the setting of conditions, press Out key to exit or
Setup key to enter the next setup.
Salinity Adjust salinity with or key.
The set salinity is automatically compensated.
If finishing the setting of conditions, press Out key to exit or
Setup key to enter the next setup.
Chapter IV Setup Functions
NeoMet
SETUP
CAL 1
1.00
ISE

10
2
SETUP
0
ALT
SETUP
0.0
Sal

17
Data Log Setup
Set by using or key
When this setup is set ¡on¡, meter transmits data with time
interval of one second.
This data can be taken by communication program or printer
via RS232C interface cable.
When DO is 6.00 mg/L and temperature is 25.0C, the
following figure is an example to print.
Temperature Setup
If temperature on display differs from a real temperature, set
a real temperature.
Set temperature by using or key.
If finishing setup, press Setup or Out key to return to DO
initial display.
Conductivity/TDS/Salinity/TEMP Meter
Conductivity Mode Setup
Temperature Coefficient
In the initial display of Conductivity, press Setup key to enter Setup and then the
display is shown as follows.
The conductivity of solution with a specific electrolyte
concentration will change in accordance with the change of
temperature. Each conductive ion has a different temperature
coefficient.
All istek's meters allow adjusting coefficient for the
advanced performance.
Press or key until the desired value is displayed.
If exiting setup, press Out key to return a initial display. If
pressing Setup key, the next setup screen is displayed.
Chapter IV Setup Functions
NeoMet
SETUP
25.0 C
SETUP
DATA
oFF
DO 6.00 25.0
SETUP
DATA
oFF

18
The following table is a typical temperature coefficients (percentage of change of
conductivity per).
Solution %/C℃
Ultra pure Water 4.55
Salt(NaCl) 2.12
5% NaOH 1.72
Dilute Ammonia 1.88
10% HCl 1.32
5% Sulfuric Acid 0.96
98% Sulfuric Acid 2.84
Cell Constant
For conductivity measurement of a solution, can accurately measure by adjusting cell
constant.
Cell constants consist of 0.01, 0.1, 1.0, 10 and 100, and set
by using or key.
Standard Solution
After setting cell constant, press Setup key, and then the display is shown as follows.
If pressing Se`lect key, conductivity of standard solution
(146.9S, 1413S, 6.67mS, 12.9mS, 111.9mS) is displayed
in turn.
If using standard solution that not showing on screen, adjust
conductivity by using or key.
Chapter IV Setup Functions
NeoMet
SETUP
1.0
SETUP
1413
S

19
The following table is shown correlation conductivity with concentration of KCl
solution.
KCl solution(M) Conductivity
0.001 146.9 S/cm
0.01 1413.0 S/cm
0.05 6.67 mS/cm
0.1 12.89 mS/cm
1 111.9 mS/cm
Compensation Temperature
After setting standard solution, press Setup key.
Press or key to change 25.0 or 20.0.
The conductivity of a solution exhibits at 25.0C or 20.0C.
Data Log Setup
Set by using or key
When this setup is set ¡on¡, meter transmits data with time
interval of one second.
This data can be taken by communication program or printer
via RS232C interface cable.
When conductivity is 1410 S and temperature is 25.0 C,
the following figure is an example to print.
Chapter IV Setup Functions
NeoMet
SETUP
25.0
COND 1413uS 25.0
SETUP
DATA
oFF

20
Temperature Setup
If temperature on display differs from a real temperature, set
a real temperature.
Set temperature by using or key.
If finishing setup, press Setup or Out key to return to
conductivity initial display.
TDS Mode Setup
In the TDS ready condition if pressing Setup key, the display is shown as follows.
TDS factor adjusts by using or key and is basically
adjusted to 0.67.
If finishing setup, press Setup or Out key to return to TDS
initial display.
Clear data(memory)
pH/ISE/mV/ORP/TEMP Meter If clearing all the stored data, press Mode key to
enter mV mode and then press Select key to clear.
Therefore, all data which set at setup, is changed to
a basic value.
DO/O2/Air/TEMP Meter If clearing all the stored data, press Mode key to
enter O2mode and then press Select key to clear.
Therefore, all data which set at setup, is changed to
a basic value.
Conductivity/TDS/Salinity/TEMP Meter
If clearing all the stored data, press Mode key to
enter Salinity mode and then press Select key to
clear. Therefore, all data which set at setup, is
changed to a basic value.
Chapter IV Setup Functions
NeoMet
SETUP
25.0 C
SETUP
0.67
TDS