DIT
Photometer
GRUNDFOS ALLDOS INSTRUCTIONS
Installation and operating instructions
Declaration of Conformity
We Grundfos Alldos declare under our sole responsibility that the product
DIT, to which this declaration relates, is in conformity with the Council
Directives on the approximation of the laws of the EC Member States
relating to
— Electromagnetic compatibility (89/336/EEC).
Standards used:
EN 61326: 1997 + A1: 1998 + A2: 2001, Class B
EN 61326: 1997 / A1: 1998 + A2: 2001
EN 60950: 12/2001 (power pack)
EN 61000-6-2: 08/2002 (power pack)
EN 61000-6-3: 08/2002 (power pack).
— Electrical equipment designed for use within certain voltage limits
(73/23/EEC) [95].
Standard used: EN 61010-1: 2002.
Pfinztal, 1st April 2008
W. Schwald
Managing Director
Ulrich Stemick
Technical Director
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CONTENTS
Page
1. Symbols used in this document 3
2. General information 3
2.1 Warranty 3
3. Identification 4
3.1 Nameplate 4
3.2 Type key 4
4. Applications 4
5. Safety 4
5.1 Obligations of owner 4
5.2 Avoidance of danger 4
6. Construction and function 5
6.1 Construction of the instrument 5
6.2 Functional principle 6
6.3 Functioning of the electrochemical pH determination
and temperature measuring (DIT-S) 6
6.4 Functioning of the electrochemical determination
of the redox potential (DIT-S) 6
6.5 Measuring ranges and tolerances 6
6.6 Technical data 7
7. Connections (DIT-S) 7
7.1 pH/redox electrode 7
7.2 Temperature sensor 7
7.3 Printer interface 8
7.4 Accumulator charging socket 8
8. Operation 8
8.1 Switching on and switching off 8
8.2 Operating buttons 8
8.3 Overview of functions 8
8.4 Configuration of the instrument 10
9. Photometrical measuring 12
9.1 General notes for handling the DIT 12
9.2 Reference adjustment 12
9.3 Operator guidance and advice for photometrical
measuring 12
9.4 Aluminium 13
9.5 Ammonium 14
9.6 Free chlorine, total chlorine and combined chlorine 14
9.7 Chloride 15
9.8 Chlorine dioxide 16
9.9 Determination of chlorine dioxide, free chlorine,
total chlorine and chlorite within the chlorine dioxide
determination 16
9.10 Chromium 17
9.11 Cyanide 18
9.12 Cyanuric acid 18
9.13 Iron 19
9.14 Fluoride 19
9.15 Hydrazine 20
9.16 Manganese 20
9.17 Nickel 21
9.18 Nitrate 21
9.19 Nitrite 22
9.20 Ozone (in absence of chlorine) 22
9.21 Ozone in the presence of total chlorine
(selective determination) 23
9.22 Phosphate 23
9.23 Photometrical determination of the pH value 24
10. pH measuring 24
10.1 Configuration 24
10.2 Unit of temperature 24
10.3 Automatic switching-off (auto off) 24
10.4 Calibration 25
10.5 Interrogation of calibration data 25
10.6 Measuring 25
11. Redox measuring 26
11.1 Configuration 26
11.2 Measuring 26
12. Maintenance and repair 26
12.1 Battery exchange (DIT-N/DIT-S) 26
12.2 Recharging the accumulator (DIT-S) 26
12.3 Cleaning 27
13. Error messages and error correction 27
13.1 Errors and defects of hardware and software 27
13.2 Error messages caused by measuring errors
or defective peripheral equipment 27
14. Disposal 27
1. Symbols used in this document
2. General information
These installation and operating instructions contain all
information important for users of the DIT Compact Photometers:
• technical data
• instructions on commissioning, use and maintenance
• safety information.
Should you require further information or should you encounter
problems occur that are not handled in sufficient depth in this
manual, please contact Grundfos Alldos.
We shall be pleased to support you with our comprehensive
know-how in the fields of measuring and control technology as
well as water treatment.
We always welcome suggestions on how to optimise our
installation and operating instructions to satisfy our customers.
2.1 Warranty
A warranty claim in accordance with our general terms of sale
and delivery is only valid if these requirements are complied with:
• The instrument has been used in accordance with the
information in this manual.
• The instrument has not been dismantled or handled
incorrectly.
• Repairs have only been carried out by authorised personnel.
• Only original parts have been used during repairs.
• Only components approved by Grundfos Alldos are used in
the entire system.
The following typical wear parts are excluded from the warranty:
• gaskets, O-rings, vials.
Warning
These complete installation and operating
instructions are also available on
www.Grundfosalldos.com.
Prior to installation, read these installation and
operating instructions. Installation and operation
must comply with local regulations and accepted
codes of good practice.
Warning
If these safety instructions are not observed,
it may result in personal injury!
Caution
If these safety instructions are not observed,
it may result in malfunction or damage to the
equipment!
Note
Notes or instructions that make the job easier
and ensure safe operation.
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3. Identification
3.1 Nameplate
Fig. 1 DIT nameplate
3.2 Type key
4. Applications
The DIT Compact Photometer is dedicated for routine analysis in
water-treatment monitoring.
The instrument is available in three versions:
• The DIT-B allows photometrical determination of up to seven
parameters which are especially dedicated for pool-water
applications.
• The DIT-N allows photometrical determination of up to
11 parameters.
• The DIT-S allows photometrical determination of up to
18 parameters. Additionally, the pH value and the redox
potential can be measured. For protocolling the results,
a printer can be connected.
5. Safety
The photometer has been constructed and tested in accordance
with safety-protective measures for electronic equipment and has
left the works in perfect condition satisfying safety requirements.
5.1 Obligations of owner
The owner of the system is responsible for the following:
• compliance with country-specific safety regulations
• training of operating personnel
• provision of prescribed protective gear
• implementation of regular maintenance.
5.2 Avoidance of danger
If safe operation cannot be ensured any longer, the DIT Compact
Photometer is to be put out of service and safeguarded against
unintentional operation. This is the case under the following
circumstances:
• The DIT Compact Photometer shows visible damage.
• The DIT Compact Photometer seems to be inoperative.
• After a long storage time under unfavourable circumstances.
TM04 0348 0508
Pos. Description
1 Type designation
2 Model
3 Product name
4 Product number
5 Year and week of production
6 Country of origin
7 Marks of approval, CE mark, etc.
8 Serial number
Example: DIT -B C -PT GEF G
Model
DIT Test photometer
Applications
BPool water
S Drinking water
NUniversal
R Universal incl. reagents
Casing
C With suitcase
X Without suitcase
Electrodes
PT Portable pH electrode
RT Portable redox electrode
X No electrodes
Languages
GEF German/English/French (standard version)
GED German/English/Danish
GFD German/French/Dutch
Supply voltage
G 1 x 230 V, 50/60 Hz, European plug
I 9 V battery (models B and N only)
DIT-B C-X-X, GEF, I
310-055-10000
S/N: 07/63516
DIT, B, C, X, X, GEF, I
96609108P1107380763516
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2
3
4
5
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Warning
Do not dismantle the instrument components!
Cleaning, maintenance and repair must only be
carried out by authorised personnel!
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6. Construction and function
6.1 Construction of the instrument
The DIT-N and DIT-B versions are powered by a 9 V monoblock
battery. For the S version, a rechargeable accumulator is used.
The multilingual plain-text display offers high operation
convenience. The user can choose English, German, French,
Dutch or Danish language (depending on software version).
Three operating modes can be selected:
• In normal mode, all analysis steps will be displayed.
• The expert mode for the proficient user shows shortened texts
and does not request every single step, which results in saving
of time.
• The professional mode activates the expert mode
permanently. The professional mode is switched on and off in
the configuration menu. It is used in all parameters.
See section 9.3.1 Carrying out the m easur ing .
Fig. 2 View of instrument (DIT-S)
TM03 6748 4506
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6.2 Functional principle
The photometer operates according to the two-beam bi-frequency
principle with carrier-frequency technology. The sample is
transilluminated by two light beams of different frequency, both
modulated by the carrier frequency. This method, shown in fig. 3,
allows the perfect compensation of disturbing influences by
turbidity of the sample, external light and ageing of the light
sources.
By adding reagents to the water sample, a chemical reaction with
the substance that shall be determined is produced. The products
of the reaction cause a colouring of the sample. The intensity of
the colouring depends on the amount of the substance in the
sample. The absorption of the light depends on the intensity of
the colouring and is a measure of the concentration of the
substance.
Fig. 3 Functional principle (schematic)
6.3 Functioning of the electrochemical pH
determination and temperature measuring (DIT-S)
A single-rod electrode can be connected for electrochemical
measuring of the pH value. By using a high-resistance amplifier,
the signal will be evaluated and displayed. The influence of
temperature on the pH value can be compensated and displayed
by using electrodes with built-in thermocouple. Different types of
buffer solutions can be used for calibration.
With all versions, the pH value can also be determined
photometrically, but within a smaller measuring range.
6.4 Functioning of the electrochemical determination
of the redox potential (DIT-S)
The redox potential can be measured by using a single-rod redox
electrode. As this is a potential measuring, calibration is not
necessary.
6.5 Measuring ranges and tolerances
6.5.1 Photometrical measuring
TM03 6749 4506
Reference receiver
Vial
Measuring cell
LED light source
Measuring wavelength
Reference wavelength
Parameter
Version Measuring range Accuracy
B N S [mg /l] [% of value + x mg/l]
Aluminium x x x 0.02 - 0.5 ± (6 % + 0.02)
Ammonium – x x 0.2 - 3.0 ± (6 % + 0.2)
Chlorine (free and total) x x x 0.03 - 5.0 ± (6 % + 0.03)
Chloride – – x 1 - 25 ± (10 % + 1)
Chlorine dioxide x x x 0.03 - 10.0 ± (6 % + 0.03)
Chromium – – x 0.03 - 0.5 ± (6 % + 0.03)
Cyanide – – x 0.01 - 0.7 ± (6 % + 0.01)
Cyanuric acid x x x 1 - 200 ± (10 % + 1)
Iron x x x 0.1 - 1.2 ± (6 % + 0.1)
Fluoride – x x 0.1 - 2.0 ± (6 % + 0.1)
Hydrazine – – x 0.05 - 3.0 ± (10 % + 0.05)
Manganese – – x 0.05 - 4.0 ± (6 % + 0.05)
Nickel – – x 0.05 - 4.0 ± (6 % + 0.05)
Nitrate – x x 0.5 - 30 ± (10 % + 0.5)
Nitrite – x x 0.02 - 1.0 ± (6 % + 0.02)
Ozone x x x 0.02 - 3.0 ± (6 % + 0.02)
Phosphate – – x 0.07 - 4.5 ± (6 % + 0.07)
pH (photometrical) x x x pH 6 - pH 8.5 ± 0.15 pH
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6.5.2 Electrochemical measuring (only DIT-S)
pH measuring
Measuring of redox potential
Temperature measuring
6.6 Technical data
6.6.1 DIT-N/DIT-B
6.6.2 DIT-S
Fig. 4 Connector pin assignment
Interface cable
7. Connections (DIT-S)
7.1 pH/redox electrode
For the connection of a pH or redox electrode, there is a coaxial
socket (B).
If no electrode is connected, the protecting cap must be screwed
onto the socket to prevent intrusion of humidity.
7.2 Temperature sensor
The temperature sensor is integrated in the pH electrode. It can
be connected using a banana plug to the corresponding socket
(A) to the left of the coaxial socket.
The instrument automatically recognises if an electrode with or
without temperature sensor is being used. If a temperature
sensor is used, it automatically switches to automatic
temperature compensation before pH measuring. Otherwise, the
temperature has to be measured in a different way and must be
entered manually. See section 10. pH measuring.
This socket need not be protected by a cap.
Measuring range 0-14 pH
Resolution 0.01 pH
Accuracy ± 0.03 pH
Temperature
compensation
Manual or automatic
Resolution 0.1 °C (1 °F)
Temperature range 0 °C to 80 °C (32 °F to 176 °F)
Two-point
calibration with
AUTO-READ
function
Sensitivity display Within –62 mV/pH to –50 mV/pH
Display of
asymmetry voltage
Within ± 60 mV
Error message for
leaving measuring
range
Stored standard
buffer solutions
(at 25 °C)
• 4.01 pH / 7.00 pH / 9.18 pH
(Grundfos Alldos)
• 4.01 pH / 6.86 pH / 9.18 pH
(DIN / NIST)
Measuring range ± 1190 mV
Resolution 1 mV
Accuracy
± 4 mV (within –700 mV to 700 mV),
± 7 mV (outside of –700 mV to 700 mV)
Error message for
leaving measuring
range
Measuring range 20 °C to 80 °C (–4 °F to 176 °F)
Resolution 0.1 °C (1 °F)
Accuracy
± 0.4 °C (within 5 °C to 70 °C)
± 1.0 °F (within 41 °F to 158 °F)
± 1.0 °C (outside of 5 °C to 70 °C)
± 2.0 °F (outside of 41 °F to 158 °F)
Display
LCD, alphanumeric, four lines, 10 signs
each
Operating
languages
English, German, French, Dutch, Danish
(depending on software version)
Optics
Two-beam bi-frequency principle with
carrier frequency technology
Enclosure material ABS
Enclosure class IP65
Dimensions 52 x 121 x 252 mm
Permissible
operating
temperature (unit)
+5 °C to +45 °C
Permissible storage
temperature (unit)
–20 °C to +70 °C
Permissible
humidity
90 % (non-condensing)
Vials ∅22 mm
Power supply
9 V monoblock battery, indication of
battery exchange
Weight About 600 g incl. battery
Automatic
switching-off
(power down)
After 45 seconds
Power supply
Rechargeable accumulator, indication of
low voltage if the voltage drops
below 6.8 V
Weight About 690 g incl. accumulator
Memory capacity
100 measuring results, acoustic signal
and display indication for full memory
Automatic
switching-off
(power down)
• After 45 seconds (photometrical
measuring)
• After 80 seconds (electrochemical
measuring)
Interface
RS-232C, 4800 baud, eight bits, one start
bit and one stop bit, no parity
TM03 6750 4506
Pin Description
1RxD
2TxD
3GND
4Free
Colour Conductor assignment
Brown RxD
White TxD
Blue GND
Note
The connections described below are only
available with the DIT-S version.
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3
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7.3 Printer interface
For protocolling the measuring results, a protocolling printer can
be connected to the RS-232C interface (C), which also allows
data transfer to a personal computer. See section
8.4.7 Configuration of the printer and storage of measuring
results (DIT-S).
If no cable is connected, the red protecting cap must be screwed
onto the socket.
7.4 Accumulator charging socket
This socket (D) serves for recharging the built-in accumulator.
See section 12.2 Recharging the accumulator (DIT-S).
If the power supply adapter is not connected, the red protecting
cap must be screwed onto the socket.
Fig. 5 Connections of DIT-S
8. Operation
8.1 Switching on and switching off
Press any button to switch on the DIT.
The instrument is designed with energy-saving CMOS
technology. To save the capacity of the battery or accumulator, an
automatic switching-off function has been integrated. This powerdown mode will be activated after 45 seconds (photometrical
measuring) or 80 seconds (electrochemical measuring, pH,
redox) if no button has been pressed meanwhile. By pressing any
button, the instrument will be activated and continues at the last
position of the program.
Therefore, there is no separate button for switching on or off the
instrument.
8.2 Operating buttons
There are four buttons for operating the instrument.
• The [Up] and [Down] buttons can be used to change between
the lines of the menus and pages.
• With [OK] the selected submenu or the selected function can
accessed.
• [Esc] leads back to the main menu and also interrupts
measuring.
Fig. 6 DIT photometer
8.3 Overview of functions
The whole menu tree is shown on the next page. After switching
on, the instrument continues in the same menu as before
switching off.
The cancel function, which is selected using [OK] like all other
functions, leads back to the previous menu level, and the [Esc]
button leads back to the main menu from every menu level
(except photometrical measuring).
In connection with photometrical measuring, the [Esc] button
leads back to the menu of the selected parameter (in the first
menu level).
Functions marked with *) and the following ones are only
available with the DIT-S.
Warning
The IP65 enclosure class only applies if the
protecting caps are screwed onto the sockets.
TM03 6751 4506
Pos. Description
A Temperature sensor
BpH/redox
CPrinter
D Accu charging
ABCD
TM03 6752 4506
Display
Buttons
Vial hole
9
Fig. 7 Overview of functions / menu tree
TM03 6753 4506
Main menu
photom.
First menu level Second menu level Third menu level
pH *)
redox *)
config
reference
aluminium
measure
cal
measure
configure
cancel
cancel
language
time
date
parameter
profi mod
cancel
...
<other
parameters>
...
config
cal data
cancel
unit
version
document. *)
measure
blanktest
zerocheck
cancel
ALLDOS
DIN/NIST
others
cancel
°C / °F
auto off
cancel
auto off
cancel
D
GB
F
mg/l
ppm
cancel
<parameter>
inactive
active
cancel
on
off
cancel
printer
memory
config
cancel
on
off
cancel
RS-232C
printer
cancel
on
off
print
delete
cancel
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8.4 Configuration of the instrument
Configuration means that certain features of the instrument can
be adjusted to the user's demand.
The operation with the four buttons is the same for all functions,
as described in section 8.2 Operating buttons.
8.4.1 Operating language
Select (starting from the main menu) the configuration menu
"config" with the [Up] and [Down] buttons. Press [OK] to access
this menu. After that, select "language" in the same way.
"D" means German, "GB" means English, "F" means French,
"NL" means Dutch and "DK" means Danish (available languages
depending on software version). Select the required language
with the [Up] and [Down] buttons, and press [OK] to confirm the
selection. The instrument returns to the previous menu level, and
all display messages will from now on be shown in the selected
language.
8.4.2 Real-time clock
With the menu item "time" in the configuration menu, the built-in
real-time clock can be set. This is necessary after battery
exchange (DIT-N/DIT-B) or after the accumulator has been totally
discharged (DIT-S).
The time shown in the display will be different from this example,
as the clock starts at "00:00:00" after battery exchange. The first
digit flashes and can be adjusted using the [Up] button. This only
works in ascending direction; after "9" it starts again with "0".
With the [Down] button, the next digit can be selected and then
adjusted in the same way. Confirm with [OK] after setting the
time. The instrument then returns to the configuration menu.
8.4.3 Date
This menu item can be used to set the day and the date.
Now the day flashes and can be set using the [Up] button.
The [Down] button can be used to select the other values and set
them in the same way. Confirm with [OK], after which the
instrument returns to the configuration menu.
8.4.4 Parameter
This menu item is used for taking single parameters out of the
menu "photom.". This is useful if not all parameters are needed at
any time, as it shortens the menu and saves operating time.
On demand, the parameters can be switched on again. When
selecting the menu item "parameter", the following display will
appear:
"active" means that the parameter is available in the
"photom." menu. Select using the [Up] and [Down] buttons, and
confirm the selection by pressing [OK]. Then the next parameter
will appear, which can be handled in the same way, etc. After the
last parameter, [OK] leads back to the configuration menu.
To finish the selection before that, select "cancel" and press [OK].
8.4.5 Unit
With this menu item it is possible to choose the unit in which the
results will appear. The units "mg/l" and "ppm" (parts per million)
are available.
Select the required unit, and confirm with [OK]. "cancel" leads
back to the configuration menu without having made any
changes.
8.4.6 Interrogation for hardware and software version
For service purposes, it is possible to look up the hardware and
software versions of the instrument. Select the menu item
"version" in the configuration menu.
This example means that the hardware is version 3.22 and the
software is version 2.58. Please keep in mind the numbers shown
on the display in case of service.
language
-> D
GB
F
set time
02:13:07
set date
TUE
01/08/01
Note
In German, French, Danish and Dutch, the date is
shown as day/month/year. In English, it is shown
as month/day/year.
The switching between these two display modes
happens automatically when selecting the
corresponding language.
aluminium
inactive
-> active
cancel
unit
-> mg/l
ppm
cancel
Note
If the unit is changed after measuring, the results
will be printed with the present unit.
version
HW 3.22
SW 2.58
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