3
BANDELIN Compact Ultrasonic Cleaning Units for aqueous cleaning liquids are efficient and failsafe.
The performance of the units depends on a number of factors, e.g.
•
the cleaning liquid used
•
the filling-level in the oscillating tub or in the inserted beaker
•
the quantity of goods to be cleaned
•
the temperature of the cleaning or contact liquid.
Ultrasound will heat up the cleaning or contact liquid in the oscillating tub or in the inserted beaker
even without additional heating. After a 30 minutes exposure to ultrasonic waves, the temperature of
the cleaning or contact liquid increases from an initial 22 °C to approximately 35 to 45 °C without
covering the oscillating tub or the inserted beaker. During constant use, temperatures of more than
80 °C can be reached. If the oscillating tub or the inserted beaker has been covered, the
temperature of the cleaning or contact liquid will be increased to about 70 or 80 °C after 60 minutes
of constant use.
When switching on the heating in SONOREX units, the tolerances given by the thermostat-
switching hysteresis must be taken into consideration. Especially in the case of low heating
temperatures deviations of up to 10 °C are possible.
If disturbances should occur after a longer period, the following hints support the user to repair the unit.
1
Overview of possible faults, causes and remedies
Faults
Possible causes
Tests and Remedies
Unit cannot be switched on
→
green pilot light is not
illuminated
→
generator fuse blows
again after exchange
No power
- Plug loose?
- Defective mains fuse?
- Defective mains cable?
- Defective timer?
- Short-circuit on generator
PCB?
- Defective generator fuse?
- Defective transistors?
Liquid or foreign particles on
PCB?
-
Check plug
-
Change main fuse.
-
Check cable for conductivity, if neces-
sary exchange it.
-
Check plug connections 1-3 and 4-6 for
conductivity on wound-up timer, repeat
measurement on constant setting (
∞
)
on plug connections 1-2 and 4-6.
Change timer item 4.6
-
Change fuse, measure resistance on
PCB between phase and phase and
bet-ween phase and protective earth
con-ductor.
-
Check generator fuse for conductivity
and if necessary exchange.
-
Check transistors for conductivity and
exchange if necessary, see item 4.1.
-
Carefully clean PCB with compressed
air or return unit for repair to the
supplier.
Unit with heater - heater
does not work
- Defective heater fuse?
- Defective heater?
- Defective thermostat of
dry-run protector?
- Defective regulating
thermostat?
-
Check for conductivity and if necessary
exchange.
-
Check heater and exchange defective
heating elements, item 4. 4.
-
Exchange, item 4. 4. 4
-
Check and if necessary exchange,
items 4. 4. 5, 4. 4. 6.
