Priming; Titrating; Freeze Count Feature; Auto Off - VWR International DIGITRATE PRO Series Instruction Manual

DIGITRATE PRO

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 flow 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, first 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 filling the borosilicate glass barrel (8). The amount of fluid taken in should be greater than
the volume required for titration and will be displayed on the LCD screen.
Note: Too fast a filling action may lead to air bubbles forming under the piston.
After each filling, 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 refilled 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 refill 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
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
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).
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Pro
Pro with one hand, while the other
barrel is