14
4
Elimination of disturbances
The display does not respond to keys being pressed, the display is dark.
The internal program is disturbed
(e.g. by electrostatic loading or a
mains overvoltage
Switch the device off, and switch it on again after 10 seconds.
TITRONIC
â
97 and
TitroLine 96:
The contrast of the display was
maladjusted.
Adjust the contrast using the knurled screw right at the bottom.
The stirrer does not work.
The connection contacts are dirty.
Clean contacts.
The dosing unit is not properly filled.
The reagent bottle is empty.
Replace or refill the reagent bottle.
The hose is not immersed deeply
enough in the reagent bottle.
Immerse the hose deeper in the bottle, or fill up reagents.
The hoses on the dosing unit were
mixed up when screwed on.
Change hose screw connections:
The slightly higher valve leads to the burette tip.
The dosing unit is not properly locked.
Lock the dosing unit by a quarter rotation at the lower position.
Air bubbles in the titration system
The valve is defective.
Replace dosing unit.
The hose connections
are not tight.
Check: Has the hose been pulled out of threaded connection?
Screw hose manually on.
Replace hoses including threaded connections.
The burette tip leaks after use.
Dirty valve does not close.
Flush dosing unit, replace solution.
When setting on a new dosing unit, the piston rod is not properly pulled in, the device rattles.
Inclined piston rod.
Set on piston rod vertically again.
Titration solution is not titrated / dosed.
The dosing unit is not properly filled.
Perform initial filling.
The dosing unit is not
properly locked.
Lock dosing unit in the lower position by a quarter rotation
to the right (
&
Fig. 4 or. Fig. 10).
The hose or the burette tip are
wrinkled or blocked.
Check clear passage through hose and burette tip,
replace if necessary.
The system contains air bubbles.
Please refer to „Air bubbles in the dosing system“.
Undissolved parts in the titration solution.
Filter or replace titration solution.
The hoses of the dosing unit were
mixed up when screwed on.
Change hose thread connections:
The slightly higher valve leads to the burette tip.
The data transfer to the printer / computer does not work.
Set transfer parameters properly.
Settings: 4800 baud, 7 data bits, no parity, no handshake.
Are you using a suitable cable?
Use a TZ 3095 for the printer or a TZ 3096 / 3097 for the PC.
Are the cables properly connected?
The
lower
socket is the RS-232-C interface.
Check cable connection, are the screws on the
PC side tightened?
PC: „COM 1“ and „COM 2“ possibly were mixed up!
Defective cable.
Replace cable.
Malfunction of printer / computer.
Switch the devices off, switch them on again after 10 seconds.
