Troubleshooting; Possible Cause - JENCONS DIGITRATE Gebrauchsanweisung

Further disassembly options
To clean or replace the FEP dispense tube (12) and/or threaded plat-
form base (10), follow these steps;
Turn the anti-drip valve to the closed position and unscrew the
threaded ring (4) to separate the pedestal base from the glass barrel
of the Digitrate. Remove dispense tube protection cover (13) as
shown opposite in an upward direction allowing dispense tube (12)
to be pulled out of anti-drip valve assembly in direction indicated.
Reassemble in reverse, make sure the front end of the dispense tube is
clipped into the dispense tube protection cover (13) from the underside.
Reassemble the remaining components in reverse order, 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 fit-
ted. The piston rack (5) must engage into 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 work-
ing smoothly. Check that no leaks occur.
Troubleshooting for Digitrate & Digitrate Pro
Problem
Air bubbles appear in discharge nozzle
Barrel does not fill with liquid
Titrating not possible
Wrong dispense volume
Liquid appears between glass barrel
and Polypropylene protection sleeve
Blank display dispite 'ON' status
8

Possible Cause

Liquid reservoir is empty
Too fast filling action
Glass barrel (8) is not sealing
against 'O' ring
Leaking piston
Leaking discharge valve
Intake tube not fitted correctly
Inlet valve stuck
Glass barrel (8) is not sealing
against the FEP 'O' ring (9)
Blocked dispense nozzle (12)
Discharge valve stuck
Instrument not calibrated
Backlash not compensated for
Leaking valves
Titrate wheels (1) not turning
uniformly
Glass barrel (8) is not sealing
against the FEP 'O' ring (9)
Damaged FEP 'O' ring
Empty battery
Malfunctioning electronics
Operator Instructions
(13) Dispense tube
protective cover
(12) FEP dispense tube
Remedy
Refil reservoir and prime unit
Operate titrate wheels (1) smoothly/slowly
Unscrew the threaded platform ring (4) and make sure
that the FEP 'O' ring (9) is properly fitted into its recess
Clean PTFE piston (7). If problem persists, replace piston
Clean unit by flushing through - if problem persists,
replace platform base (10)
Connect correctly
Free inlet valve by inserting a thin rod into the inlet
aperture and push gently
Unscrew the threaded platform ring (4) and make sure
that the FEP 'O' ring (9) is properly fitted into its recess
Disassemble the dispense nozzle (12) and flush through
with cleaning fluid
Clean unit by immersing platform in cleaning fluid
- if problem persists, replace platform base (10)
Calibrate unit
Compensate for backlash
Clean platform base (10) - if problem persists,replace
Operate titrate wheels (1) slowly
Unscrew the threaded platform ring (4) and make sure
that the FEP 'O' ring (9) is properly fitted into its recess
Replace FEP 'O' ring (9)
Send unit for battery replacement
Send unit for repair
Anti-drip tap valve