VWR International DIGITRATE PRO Series User manual

EU Cat. No. NA Cat. No.
30 ml 612-3875 75856-476
50 ml 613-5287 75856-478
Version: 1
Issued: May 2017
Digitrate Pro
Instruction Manual
For capacities of 30 ml and 50 ml

DIGITRATE PRO
2VWR |INSTRUCTION MANUAL |EN
Instruction Manual............................. 1 – 14
Manuel d’instructions ...................... 15 – 28
Bedienungsanleitung ....................... 29 – 42
Manual de instrucciones .................. 43 – 56
Manuale d’istruzioni ........................ 57 – 70
Manual de instruçõe ........................ 71 – 84
EN
FR
DE
ES
IT
PT
United States
Manufactured for:
VWR International, LLC
100 Matsonford Rd
Radnor, PA 19087
800-932-5000
http://www.vwr.com
Europe
Address of legal manufacturer
VWR International bvba
Researchpark Haasrode 2020
Geldenaaksebaan 464
B-3001 Leuven
+ 32 16 385011
http://be.vwr.com

3EN |INSTRUCTION MANUAL |VWR
WARNING!
•Always observe general safety regulations (e.g. wear suitable eye, face, hand and general protection).
•Follow this operating instruction manual.
•NEVER use force! Breakage of any part may lead to the operator and/or other persons being exposed to
hazardous substances.
•Do not use the instrument where ammable fumes may exist.
•NEVER use damaged or deformed components.
Contents
Warning ...........................................................................3
Safety Information............................................................4
Package Contents.............................................................4
Installation........................................................................5
Restrictions of Use........................................................5
Before Using the Digitrate Pro ......................................5
Assembly......................................................................5
Specication.....................................................................5
Instructions for Use ..........................................................5
Priming.........................................................................6
Titrating........................................................................6
Freeze Count Feature....................................................6
Auto Off.......................................................................6
Adjustable Head ...........................................................6
User Calibration Procedure ...........................................7
Troubleshooting ...............................................................8
General Maintenance .......................................................9
Maintenance/Cleaning..................................................9
Sterilisation/Autoclaving ...............................................9
Fluid-Path Disassembly Procedure.................................9
Further Disassembly Options ......................................10
Accessories and Spares...................................................12
Adaptors ....................................................................12
Reservoirs...................................................................12
Spare Parts .................................................................13
Technical Service ............................................................13
Return for Repair ........................................................13
Servicing.....................................................................13
Warranty ........................................................................13
Equipment Disposal........................................................14

DIGITRATE PRO
4VWR |INSTRUCTION MANUAL |EN
Safety Information
Careful safety precautions must apply when dispensing corrosive, radioactive or hazardous chemicals.
•When using the instrument, take into consideration the chemical compatibility of the materials in
contact with the liquid.
•Always check the Digitrate Pro for leaks. Make sure that the inlet tube (14) and FEP dispense tube (12)
are rmly in position before starting to use the instrument.
•Never carry the instrument while holding onto its dispensing barrel or electronic head (2). Always
support the bottle with one hand under its reservoir and the other hand around the threaded platform
base (10) of the dispenser in order to stabilize the unit.
•Avoid contact with the FEP dispense tube nozzle (12).
•When dispensing make sure that anti-drip valve is open (11).
•Use only original spare parts and original accessories (See Page 12 and 13).
•If in doubt, consult your safety ofcer.
Package Contents
•Digitrate Pro titrator
•Three adaptors 33 mm, 38 mm and 45 mm (See Page 12).
•PTFE inlet tube (See Pages 11 and 13).
Note
Refer to pages 10 and 11 for diagram references.

5EN |INSTRUCTION MANUAL |VWR
Installation
Restrictions of Use
NEVER use the Digitrate Pro with:
•Liquids which are not compatible with PTFE, PVDF, borosilicate glass, alumina ceramic, FEP or those which
might attack platinum-iridium
•Hydrouoric acid
•Liquids which contain solid particles
•Temperature limits of Digitrate Pro and reagent are 15 °C to 40 °C
Before Using the Digitrate Pro
Check that the instrument has not been damaged in transit. Do not grip the electronic head casing (2) when
screwing, unscrewing or adjusting the instrument.
The Digitrate Pro is tted with a non-rechargeable lithium battery. The battery life is greater than 60,000 three
minute titrations (low battery is indicated with an icon on the display). The battery should be changed only by
a certied person. The lithium battery should be disposed of correctly, on no account should it be incinerated.
Assembly
The Digitrate Pro is packed with the FEP dispense tube (12) attached and the PTFE inlet feed tube removed
(14). The 300 mm length of PTFE inlet tube provided should be trimmed to t your particular container.
The bottom end should be cut diagonally at a length that is close to the bottom of the container when the
Digitrate Pro is assembled onto the container. Longer lengths of inlet tube are available on request (14).
Four adaptors are available as accessories to suit containers with a 33 mm, 38 mm, 40 mm or 45 mm screw
neck. (3 are included with this unit). The threaded platform base on the Digitrate Pro has a 30 mm screw
thread for use with containers of this size.
The assembled Digitrate Pro is screwed to the reservoir using gentle hand torque applied to the threaded
platform base (10) only. Removal should also be by means of hand torque applied to the threaded platform
base (10) only.
Do not operate the titrate wheels (1) until the unit is safely and fully mounted onto the reservoir.
Specication
Accuracy ≤±0.2% on maximum delivery and a precision ≤0.1%CV using distilled water at 20 ºC.
Testing takes place according to DIN EN ISO 8655 using maximum nominal volume of distilled water at 20 °C,
with a uniform and smooth dispense action.
Instructions for Use
Four momentary action push buttons
1. ‘On’ - switches the unit on and displays the last reading (15).
2. ‘Reset’ - reverts display to 00.00 (18).
3. ‘CAL’ - user custom calibration - pen point access (17).
4. ‘Mode’ - toggles between aspirate or titrate on the LCD display (16).

DIGITRATE PRO
6VWR |INSTRUCTION MANUAL |EN
Priming
Position an empty container under the right angle of the FEP dispense tube nozzle (12), open anti-drip valve
(11) and move the piston to the fully down position. The FEP dispense tube nozzle (12) must point away from
the user at all times. Prime the unit by a few gentle up and down piston strokes, taking the piston right down
and lifting about an inch or so. Repeat until a steady, bubble free ow is obtained from the FEP dispense tube
nozzle (12). Priming can be completed without switching the unit on. After priming, the piston should be left
in the fully down position. When not in use turn anti-drip valve (11) to the closed position.
Titrating
To titrate, rst switch the instrument on by pressing the ’ON’ button (15). Press ‘MODE’ (16) until the LCD
arrow points upwards. Press ‘RESET’ (18) to zero the unit. Open anti-drip valve (11) and gently turn the titrate
wheels (1) ’up’ so lling the borosilicate glass barrel (8). The amount of uid taken in should be greater than
the volume required for titration and will be displayed on the LCD screen.
Note: Too fast a lling action may lead to air bubbles forming under the piston.
After each lling, compensate for backlash by turning the hand wheels (1) slightly in the discharge direction
until 1-2 drops are dispensed into an empty container.
To start titration, press the ‘MODE’ button (16) so that the arrow points down. Press the ‘RESET’ button (18)
to zero the display. Place a receiving vessel under the FEP dispense tube nozzle (12) and gently turn the titrate
wheels (1) ‘down’ so dispensing liquid. The dispensed volume will be shown on the display. Do not drive the
piston to the bottom of its stroke, but stop a few ml short of it. If necessary, the borosilicate glass barrel (8)
may be relled at any time during the titration, without affecting the dispensed volume shown on the LCD
using ‘Freeze Count’ feature.
Freeze Count Feature
Digitrate Pro has a unique ‘Freeze Count’ feature enabling the user to freeze the displayed value. This
function allows backlash compensation after replenishing the barrel during titration, without affecting the
value displayed. Simply press and hold ‘ON’ button (15), aspirate to rell barrel. Release ‘ON’ button (15) to
continue titration. It also allows the user to take a sample of the dispensed liquid during titration, just press
‘ON’ button (15) to ‘Freeze Count’.
Auto Off
The Digitrate Pro will automatically switch off when it is idle for a period of more than three minutes. The
instrument is switched on by pressing the ‘ON’ switch (15). When the instrument is switched on, the previous
value is displayed. For subsequent titration, press the ‘RESET’ button (18) to zero the display.
Adjustable Head
The display unit head (2) can rotate on the threaded platform base and be adjusted to suit the user.
Adjust the orientation of the display head (2) to the desired position, only when the Digitrate Pro barrel is
empty. Loosen the threaded ring (4) of the platform base by a quarter turn and rotate the display head (2)
to the desired angle by holding the threaded base (10) of the Digitrate Pro with one hand, while the other
hand rotates the polypropylene protection sleeve (3). When the angle of the display is in its desired position,
retighten the threaded ring.
Never rotate the display by holding on to the ‘electronic display head casing’ (2).

7EN |INSTRUCTION MANUAL |VWR
User Calibration Procedure
The user is allowed to override Factory Calibration and custom calibrate the Digitrate Pro.
The procedure is as follows:
1. Establish a mean volume of 10 dispensings of nominal volume of distilled H20 at 20 °C (e.g 50 ml for the
50 ml unit), and establish the mean value gravimetrically. After each lling, remember to reset the display
(18) to 00.00, only after you have compensated for any backlash.
2. When the mean volume, taking into account the correction factor (see formula below), has been
established, turn the titrate wheels so that nominal volume is displayed i.e. 50 ml for the 50 ml unit.
3. With the instrument turned on, press the calibration switch (17) through the right hand pen hole.
4. The LCD will ash ‘CAL’.
5. Use the ‘ON’ button (15) as ‘–’ and the ‘Reset’ button (18) as ‘+’ to set the calculated mean volume on
the display. Push once for increment of ‘1’ – continuous push runs the numbers faster.
6. Store the new value by pressing the ‘MODE’ button (16). The word ‘CAL’ appears on the display from
now on in order to indicate that the unit has been calibrated by the user.
Calculation (for the nominal volume)
Mean value
xi= results of the weighings
n = number of weighings
Mean volume V = x*Z
Z = correction factor (e.g. 1.0029 μl /mg at 20 °C, 1013 hPa)
Calculate the dispensed volume by taking the temperature into account
(1 ml distilled water at 20 °C = 0.997 g)
x = n
xi
Factory calibration gures, however, are retained in the memory at all times.
To return to the factory calibration:
1. Press the calibration button through the pen hole twice.
2. The display cancels the word ‘CAL’ and the unit is returned to the factory calibration.

DIGITRATE PRO
8VWR |INSTRUCTION MANUAL |EN
Troubleshooting
Problem Possible Cause Remedy
Air bubbles appear in discharge
nozzle
Liquid reservoir is empty Refill reservoir and prime unit
Too fast filling action Operate titrate wheels (1) smoothly/slowly
to ensure all air is removed
Glass barrel (8) is not sealing against FEP
‘O’ ring (9)
Unscrew the threaded platform ring (4)
and make sure that the FEP ‘O’ ring (9) is
properly fitted into its recess
Leaking piston (7) Clean PTFE piston (7). If problem persists,
replace piston
Leaking discharge valve Clean unit by flushing through - if problem
persists, replace platform base (10)
Barrel does not fill with liquid Intake tube not fitted correctly (14) Connect correctly
Inlet valve stuck (11) Free inlet valve (11) by inserting a thin rod
into the inlet aperture and push gently
Glass barrel (8) is not sealing against the
FEP ‘O’ ring (9)
Unscrew the threaded platform ring (4)
and make sure that the FEP ‘O’ ring (9) is
properly fitted into its recess
Titrating not possible Blocked dispense nozzle (12) Disassemble the dispense nozzle (12) and
flush through with cleaning fluid
Discharge valve stuck (11) Clean unit by immersing platform in
cleaning fluid - if problem persists, replace
platform base (10)
Wrong dispense volume Instrument not calibrated Calibrate the unit
Backlash not compensated for Compensate for backlash
Leaking valves (11) Clean platform base (10) - if problem
persists, replace
Titrate wheels (1) not turning uniformly Operate titrate wheels (1) slowly
Liquid appears between glass barrel
and polypropylene protection sleeve
Glass barrel (8) is not sealing against the
FEP ‘O’ ring (9)
Unscrew the threaded platform (4) ring
and make sure that the FEP ‘O’ ring (9)
is properly fitted into its recess, slightly
stretching the ‘O’ ring with your fingertips
may assist this
Damaged FEP ‘O’ ring (9) Replace FEP ‘O’ ring (9)
Blank display despite ‘ON’ status Empty battery Send unit for battery replacement
Malfunctioning electronics Send unit for repair

9EN |INSTRUCTION MANUAL |VWR
General Maintenance
Maintenance/Cleaning
1. Place the instrument into a sink together with its reservoir. Unscrew the threaded platform base (10) and
lift the dispenser’s intake tube (14) carefully out of the reservoir, whilst tapping it against the reservoir’s
aperture in order to shake off any droplets from the intake tube.
2. Hold the FEP dispense tube nozzle (12) over the aperture of the reservoir and apply gentle piston strokes
in order to return the contents into the reservoir.
3. Flushing out with distilled water or a suitable solvent is recommended after the Digitrate Pro has been
used with crystallizing uids. This will preserve the smooth action of the piston and free action of the inlet
and outlet valves. If the inlet valve (11) does stick and is not freed by ushing, it may be freed by gently
inserting a thin rod into the inlet aperture and gently pushing the ball off its seating. Re-check unit for
operation.
4. Empty the instrument completely after cleaning.
Note:
All maintenance should be carried out wearing suitable eye protection and protective clothing. If in doubt,
consult your safety ofcer.
Sterilisation/Autoclaving
Note:
The electronic display head cannot be sterilised or autoclaved. Chemical sterilisation will damage electronic
components. Autoclaving will cause permanent damage to the electronic components and the battery may
explode.
Before sterilisation or autoclaving, please follow the maintenance ‘ushing out procedure’. Sterilisation/
autoclaving is carried out to ‘uid-path’ components only.
Chemical sterilisation is permissible by soaking the ‘uid-path’ components overnight in a dilute (1:1000)
solution of sodium hypochlorite. The Digitrate Pro should be rinsed well in sterile, distilled water if the latter
method is used.
Autoclaving of ‘uid-path’ components is permissible at 121 °C, 2 bar, after the normal cleaning procedure
has been carried out.
Fluid-Path Disassembly Procedure
Disassembly should only be undertaken AFTER the unit has been cleaned, using the standard cleaning
procedure described above. Undo the threaded platform ring (4) of the base platform and remove the
electronic display head (2) together with the PTFE piston (7), piston rack (5) and polypropylene protection
sleeve (3) from the platform base (10). Take care not to lose the FEP ‘O’ ring (9) which is mounted inside the
platform recess.
Slide the glass barrel (8) off the piston (7) and lay it in a safe place. Turn the titrate wheels (1) down until the
piston rack (5), together with the PTFE piston (7), disengages from the electronic display head (2) and slide
them back into the glass barrel (8) from the bevelled edge end, taking care not to damage the piston when
inserting it into the glass barrel.
Place these components and the threaded base platform (10) with FEP dispense tube (12) and protection
cover (13) attached, together with PTFE inlet tube (14) on a suitably soft surface within the autoclave in
order to avoid metal contact.
Steam sterilisation of the piston outside the glass barrel may damage it. Do not use hard tools to scrape off
residue of reagent from the piston. Do not use force in assembly or disassembly.

DIGITRATE PRO
10 VWR |INSTRUCTION MANUAL |EN
Further Disassembly Options
To clean or replace the FEP dispense tube (12) and/or
threaded platform base (10), follow these steps;
Turn the anti-drip valve (11) to the closed position
and unscrew the threaded ring (4) to separate the
pedestal base from the glass barrel of the Digitrate Pro.
Remove dispense tube protection cover (13) as shown
oppositein an upward direction allowing FEP dispense
tube (12) to be pulled out of anti-drip valve assembly
(11) indirection indicated.
Reassemble in reverse, make sure the front end of the
FEP dispense tube (12) is clipped into the dispense tube
protection cover (13) from the underside.
Reassemble the remaining components in reverseorder,
making sure that the FEP ‘O’ ring (9) is well located into
its platform recess.
Note:
Bevelled inside edge of barrel must be at the top end
when tted. The piston rack must engage in to the
electronic head with the piston rack teeth pointing
forward in the direction of the display.
After reassembling the instrument, prime with distilled
water to ensure that assembly has been correctly
followed and piston is working smoothly. Check that
no leaks occur.
Dispense tube
protective cover (13)
FEP dispense tube (12) Anti-drip tap valve (11)
Digitate Pro wheels (1) (pair)
ASA electronic head casing (2)
Polypropylene protection sleeve (3)
Threaded platform ring (4)