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