Tintometer AQUALYTIC SensoDirect CD 24 User manual

SensoDirect CD 24
Conductivity/TDS/Salinity Meter
Operating instructions
%
°C
µS
kOhmmS
SALmg/l
LFNLF%/K1/cm
MEAS
HOLD
°F
°C
MeasCal
HoldRclStore
On
OffMenu
GB

2
Declaration of CE-Conformity
The manufacturer: Tintometer GmbH
Schleefstraße 8 a
44287 Dortmund
Deutschland
declares that this product
Product name: SensoDirect CD 24
with all optional items conforms to the following regulations:
EMC EN 55 022 : 6 / 1993 class B
EN 50 082-1 (EN 61000-4-6,
EN 61000-4-4, EN 61000-4-3,
EN 61000-4-2)
The product conforms to the regulations of the
EMC Directive 89/336/EEC and 73/23/EEC.
Dortmund, March 12, 2003
Cay-Peter Voss,
Managing Director

3
Table of Contents Page
1. Scope of delivery .............................................................. 4
2. System description ........................................................... 4
3. Connections ..................................................................... 6
4. Display ............................................................................. 6
5. Keypad ............................................................................ 7
6. Startup ............................................................................. 7
7. Measurement ................................................................... 9
8. Configuration of the unit ................................................. 1 0
8.1 ‘Unit’ .............................................................................. 1 0
8.2 ‘Auto Range’ - Automatic range selection ...................... 1 0
8.3 Selection of temperature compensation ......................... 1 0
8.4 ‘t.Lin’ – Setting of compensation coefficient .................... 1 1
8.5 ‘t.rEF’ – Selection of temperature unit °C /°F .................. 1 1
8.6 ‘C.tdS’ – Input of TDS factor .......................................... 1 2
8.7 ‘CELL’ – Input of TDS factor ........................................... 1 2
8.8 ‘Unit t’ – Selection of temperature unit °C /°F ................. 1 2
8.9 ‘Offset’ – Zero point temperature offset .......................... 1 2
8.10 ‘P.oFF’ – ‘Power off’: automatic unit switch-off ............... 13
9. Calibration of conductivity measurement ........................ 1 3
9.1 Restoring the factory calibration setting .......................... 15
10. Result memory ............................................................... 1 5
10.1 Storing results ................................................................ 1 5
10.2 Displaying stored results ................................................. 1 6
10.3 Deleting stored results .................................................... 16
11. Error messages and troubleshooting .............................. 17
12. Technical data ................................................................ 19
13. Accessories .................................................................... 21
14. Assembling Carrying strap .............................................. 22

4
1. Scope of delivery
Standard:
• AQUALYTIC®SensoDirect CD 24
• Batteries, 4*AA 1,5 V cells
• Operating instructions
• Carrying strap
Set:
• AQUALYTIC®SensoDirect CD 24
• Batteries, 4*AA 1,5 V cells
• 4 pole measuring sensor
• Carrying case
• Operating instructions
• Carrying strap
2. System description
The AQUALYTIC®SensoDirect CD 24 is a sturdy, wa-
ter-proof handheld meter designed for daily measure-
ments in the area of field or laboratory analysis.
It is used to measure conductivity, total dissolved so-
lids and salinity in surface water and groundwater as
well as in the field of waste water or industrial water
analysis.
The system complies with the requirements in EN
60529 relating to protection class IP67 and water-
proof/dustproof properties.
The permanent protective plating on the unit serves
not just as impact protection but also as a storage

5
compartment for the electrode and as an anti-slip de-
vice when the meter is used in an upright instrument
position.
A "Low Bat” indicator in the display shows the user
when it is time to change the batteries.
The required temperature compensation for the sy-
stem is performed automatically (ATC) following con-
nection of the temperature sensor (NTC 10 kOhm) that
is integrated in the conductivity electrode.
The Min/Max function enables the user to identify mi-
nimum or maximum results and to show these results
on the display.
Temperature compensation during measurement can
be carried out either in non-linear mode in accordan-
ce with EN 27888 or in linear mode. The system is
calibrated using Tintometer standard solutions.
An internal memory for 20 results is integrated in the
unit as standard. The memory stores location, result
and temperature.
The memory is called up via the display.
%
°C
pH
RealmV
mV
ATCOCAL
MAX
MEAS
MIN
HOLD
°F
°C
MeasCAL
HoldKClStore
On
OffMenu
%
°C
SAL mg/l kOhm mS µS
LF NLF %/K 1/cm
MEAS
HOLD
°F
°C
Meas Cal
Hold Rcl Store
On
Off Menu
123
456
789

6
3. Connections
4. Display
Main display: Result or user
prompt
[SAL] Salinity, g/kg
[mg/l] TDS
Total Dissolved Solids
[kOhm] Specific Resistance
(1/conductivity)
kOhm · cm
[mS] Conductivity ms/cm
[µS] Conductivity µS/cm
Secondary
display: Result - temperature or user prompt
[°C/°F] Temperature unit
[∆
!
]Warning index - battery
[LIN] Linear temperature compensation
[NLF] Non-linear temperature compensation
[%/K] Unit for temperature compensation coefficient
[1/cm] Unit for cell constant correction
[MAX/MIN/
HOLD] show whether maximum, minimum or Hold value is
shown
%
°C
µS
kOhm mS
SAL mg/l
LF NLF %/K 1/cm
MEAS
HOLD
°F
°C
Conductivity measuring cell

7
5. Operation
6. Startup
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.
[Meas] Continuous measurement,
(standard setting)
[Hold] Retain of current result
[On/Off] On/Off
[▲] [▼]Leaf through menu or
memory or show maximum [▲]
or minimum [▼]value
[Cal] Calibration mode
[Rcl] Display of stored results
[Store] Storage of current result or acceptance of
unit configuration
[Menu] Unit configuration
Remove
6 screws
4 x AA 1,5 V
Don`t
touch
Display
Meas Cal
Hold Rcl Store
On
Off Menu

8
When inserting the batteries, ensure correct polarity!
Screw the unit back together carefully without exer-
ting 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 batte-
ries 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 completely empty.
Only use the matching Tintometer conductivity elec-
trodes!
Other electrodes may cause serious damage to the
meter and the electrode.
Switch off the unit before changing electrodes. Plug in
the electrode before switching the unit back on.
The unit is factory-calibrated to the supplied electro-
de. If the electrode is replaced, the unit must be facto-
ry-calibrated.
The electrode must be plugged in before the unit is
switched on.
Switch the unit on via the [ON/OFF] key.
Following measurement, please switch the unit off
using the [ON/OFF] key.
On
Off

9
7. Measurement
Measuring mode MEAS
After the unit is switched on, it is automatically in the
standard measuring mode MEAS.
You can “freeze” the result shown in the display by
pressing the [Hold] key.
If you press the [Hold] key once again, the meter swit-
ches back to the continuous measuring mode.
Four display modes are supported:
Conductivity (units – mS/cm
and µS/cm)
Resistance (unit – kOhm · cm)
Salinity (unit – g/kg)
Total dissolved solids (TDS) (unit – mg/l)
The conductivity mode supports 4 different measu-
ring ranges:
0,0 ... 200,0 µS/cm
0 ... 2000 µS/cm
0,00 ... 20,00 mS/cm
0,0 ... 200,0 mS/cm
When the Auto Range feature is active, the meter au-
tomatically selects the most suitable resolution.
When the Auto Range feature is inactive, you can chan-
ge to the next measuring range resolution by briefly
pressing the [Meas] key. If the highest resolution is ac-
tive when you press the key, the unit switches to the
lowest measuring range resolution.
Meas
Hold

10
8. Configuration of the unit
To configure the unit, press the [Menu] key.
The first menu item appears.
If you press the [Menu] key again, the display jumps to
the next menu item.
You can set the various parameters using the [▲] [▼]
keys.
Press the [Store] key to store and conclude configura-
tion.
The unit then switches back to measuring mode.
You can terminate the configuration process by pres-
sing the [Meas] or [Hold] key.
Settings made up to this point are not stored.
The unit retains the previous settings.
8.1 ‘Unit’: Selection of the display
mode
SAL: Salinity
mg/l: TDS
kOhm: Specific Resistance
mS/µS: Conductivity
8.2 ‘Auto Range’: automatic range
selection in Conductivity measuring
mode
off: the range is entered manually ([▲]or [▼] keys )
on: the most suitable range is automatically set by
the unit
Menu
Store
+
Hold
Meas
µS
kOhm mS
SAL mg/l

11
8.3 ‘Temperature Compensation’:
Selection of temperature compensation
off: no temperature compensation
nLF: non-linear temperature compensation for na-
tural water in acc. with EN27888 (DIN 38404).
(for analysis of groundwater or surface, drin-
king or ultrapure water)
Lin: linear temperature compensation
(for other aqueous solutions)
Non-linear temperature compensation 25°C for natu-
ral water is always used for measurement of total dis-
solved solids (TDS).
During salinity measurement, the unit automatically
switches to non-linear temperature compensation in
acc. with IOT (reference temperature = 15°C).
8.4 Setting of compensation
coefficient (only when t.Cor = Lin)
0.300 … 3.000: temperature compensation coefficient
in %/K.
The factor for the solution in question must be deter-
mined in pre-trials.
8.5 Selection of reference temperature
(only when t.Cor = nLF or Lin)
20°C: Reference temperature 20°C
25°C: Reference temperature 25°C
%/K

12
8.6 Input of TDS factor
0.40 ... 1.00: Conversion factor for TDS measure-
ment.
The conversion factor depends on the composition of
the medium and needs to be determined separately
for each type of water.
8.7 Cell Constant 1/cm
The cell constant may change due to soiling, depo-
sits or other mechanical influences on the measuring
cell. If an exact standard reference solution is availa-
ble, the measuring cell can be adjusted accordingly
by changing the cell constants. Additionally, the cell
constant can be automatically recorded by means of
calibration.
• User calibration: cELL
• Manufacturing calibration: CELL
8.8 Selection of temperature
unit °C /°F
°C: All temperature values in degree Celsius
°F: All temperature values in degree Fahrenheit
8.9 Zero point temperature offset
-2.0°C...2.0°C bzw. –3.6°F...3.6°F
The zero point for temperature measurement is offset
by this value.
This enables the user to balance out any occurring
sensor deviations:
1/cm

13
Displayed temperature =
measured temperature – offset
off: zero point offset is inactive (=0.0°)
8.10 ‘Power off’: automatic unit
switch-off
If no key is pressed during the switch-off delay peri-
od, the unit switches off automatically after the selec-
ted time has run down.
The desired delay time is entered in minutes.
If P.oFF = oFF, automatic unit switch-off is inactive.
9. Calibration of conductivity measurement
The individual electrode data of conductivity sensors
are stable for extremely long periods of time.
If, however, you establish deviations during tests, you
can improve measuring accuracy by performing cali-
bration.
Tintometer standard conductivity solutions serve as a
reference.
These solutions have a defined conductivity of
1413 µS/cm. Standard solutions with other conducti-
vity levels may also be used to calibrate the system.
The shelf life of calibration solutions is limited and is
shortened further by, among other things, inadequate
cleaning and drying of the electrode prior to insertion.
This can lead to incorrect calibration!
You should therefore always use fresh solutions for
calibration and clean the electrode using deionised or
distilled water!

14
Performing calibration
Prepare electrode and calibration solution.
Clean the electrode using deionised water and dry
carefully.
Insert the electrode in the vessel containing the cali-
bration solution and stir well.
Starting calibration: Press [Cal] key.
‘CAL’ appears momentarily in the display, then the pre-
vious cell constant is shown briefly:
You can terminate calibration at any time by pressing
the [Meas] key or [Hold] key. In this event, the previous
calibration setting is retained.
Input of calibration solution
The flashing display shows the last-used calibration
value or the factory-set 1413 µS/cm. You can change
this value via the [▲]or [▼]keys in the range from
1000...2000 µS/cm. The value you enter is the cor-
rect temperature (non-compensated) LF value. You
then confirm and complete your choice by pressing
the [Store] key. During calibration, CAL flashes in the
display. If the value is stable, calibration is complete
and the new cell constant is briefly shown in the dis-
play. If the cell constant calculated during calibration
is outside the range 0.55 +/-0.11 1/cm, an error mes-
Meas
Hold
Store

15
sage is shown and the original calibration value is re-
tained.
• User calibration cELL
• Manufacturing calibration CELL
9.1 Restoring the factory calibration setting
You can set the conductivity meter back to the factory
setting by simultaneously pressing the [On/Off] and
[Cal] keys when you switch the system on.
10. Result memory
A maximum of 20 results with the corresponding tem-
peratures can be stored.
10.1 Storing results
You can store the current result in the result memory
by pressing the [Store] key.
[Stor] and the number of the memory location appear
briefly in the display.
10.2 Displaying stored results
You can call the stored results up in the display by
pressing the [Rcl] (=Recall) key.
The first time you press the [Rcl] key, the number of
the memory location and the corresponding value are
displayed.
The second time you press the key, the temperature
for this result is displayed. You can use the [▲][▼]keys
to switch between the stored results.
On
Off
Cal
Store
+
Rcl

16
Store
As soon as you press the [Store], [Meas] or [Hold] key,
the unit reverts to the corresponding measuring mode.
10.3 Delete stored results
If you press the [Store] key for longer than 2 seconds,
the unit switches to the delete menu [CLR].
You can use the [▲][▼]keys to select the desired ac-
tion and press the [Store] key to execute it.
The unit then returns to the corresponding measuring
mode.
[CLr-ALL]: delete all stored results.
[CLr-LASt]: delete the last-stored result.
[CLr-no]: do not delete any result.
Meas
Store
+

17
11. Error messages and troubleshooting
Display Cause Remedy
Weak battery vol- Insert new batteries
tage, the unit will
only continue to
function for a short
time
Batteries empty Insert new batteries
No display or Batteries empty Insert new batteries
strange symbols Batteries incorrectly Check batteries
inserted
Unit does not react System error Disconnect batteries,
when keys are wait for a short time,
pressed reconnect the batter-
ies
Unit defective Send in for repair
Err.1 Exceeds Check: can value
measuring range exceed admissible
measuring range?
-> Result too high!
Sensor/Electrode Send in for repair
defective
Err.2 Below Check: can value be
measuring range below admissible
measuring range?
-> Result too low!
Sensor/ Electrode Send in for repair
defective

18
Display Cause Remedy
Err.7 System error Send in for repair
Err.11 Value could not be Temperature outside
calculated the admissible
temperature
measuring range
Calibration
Display Cause Remedy
CAL.-Err.1 Value was inad- Clean electrode,
missible, cell re-calibrate
constant too high: If error repeated
electrode defective -> replace electrode
Buffer solution Use fresh buffer
unusable solution
CAL.-Err.2 Value was Replace electrode
inadmissible, cell
constant too low:
electrode defective
Buffer solution Use fresh buffer
unusable solution
CAL.-Err.4 Wrong temperature Calibration only
during calibration possible in range
from 10 … 40°C

19
12. Technical data
Parameter Indicating ranges Resolution
Conductivity 0.0 ... 200.0 µS/cm 0.1 µS/cm
0 ... 2000 µS/cm 1 µS/cm
0.00 ... 20.00 mS/cm 0.01 mS/cm
0.0 ... 200.0 mS/cm 0.1mS/cm
Specific Resistivity 0.005 ... 100.0 kOhm 0.001 kOhm · cm,
0.01 kOhm · cm
0.1 kOhm · cm
Total dissolved 0 ... 1999 mg/l 1 mg/l
solids (TDS)
Salinity 0.0 ... 70.0 0.1
Temperature -5.0 ... +100.0°C0.1°C
23.0 ... 212°F bzw. 0.1°F
• Accuracy: conductivity, spec. resistance, TDS and
(at nominal temperature) salinity (±3 digits) ±0.5% of result±0.5%
FS
temperature ±0.3K
• Cell correction: determination with automatic
calibration in the range
from 0.55 to ±0.11 1/cm
• Temperature choice of
compensation: - linear temperature compensation with
a compensation factor of 0.3 to 3.0 %/K
- non-linear temperature compensa-
tion in acc. with EN 27888 (DIN 38404)
reference temperatures 20°C and 25°C
or without temperature compensation

20
• Calibration: 1-point calibration with conductivity
solution in the range from
1000...2000µS/cm
• Nominal temperature: 25°C
• Operating temperature:
unit: 0 to +50°C
measuring cell: -5 to 80°C (short-term to 100°C)
• Memory: Measured values are stored for the
ranges „conductivity“, „resistivity“,
„TDS“ and „salinity“ together with the
temperature at which the value
occurred
• Power supply: 4 x 1.5V batteries, type AA, operating
life up to >1500h (depending on measu-
ring mode)
• Power consumption: ca. 2.0 mA, max. 4.2 mA
at 199.9 mS/cm
• Battery change
indicator: ‚bAt '
• Automatic „Off“
function: if no key is pressed and no data
transfer transfer is occurring, the unit
switches off after the switch-off delay
time. May be set between 1 and 120
minutes or inactive.