BUCHI Inert Loop B-295 - Manual (Page 64)

8 Troubleshooting
64 B-290 Operation Manual, Version I
Table 8-2: Malfunctions and their remedy (cont.)
Malfunction Possible cause Corrective measure
Product drips in spray chamber No spray flow
Insufficient spray flow Open compressed air valve
Inspect pressure of air in the supply
tube (5–8 bar)
Insufficient aspirator performance Discharge filter blocked Dismantle filter and clean it
Deposits on the spray cylinder Nozzle is not clean
Nozzle is defective (bent nozzle
needle)
Product will not dry
Entry temperature is above the melting
point of the product
Product related deposits
Wide spray angle deposits droplet on
the spray cylinder wall Completely dismantle the nozzle and
clean with water
Replace nozzle or defective element
Reduce the temperature difference
between entry and exit
Increase rate of gas spray flow
(> 600 l/h)
Reduce peristaltic pump performance
Reduce entry temperature
No action possible
Narrow the spray angle by adjusting
the spray cap position
Glass elements become wet Peristaltic pump lever has become
loose Tighten lever
Irregular or pulsed spraying Leaks in the spray nozzle Check seals in the spray nozzle and
replace if necessary
Deposits in the cyclone Product related deposits
Static charge build-up
Product too moist
Temperature too high No measure possible
Insert earthing cable
Increase exit temperature to dry the
product
Reduce aspirator performance to
reduce residence time of product
Exit temperature does not rise Sensor not inserted
Fault in tubing system Place probe in coupling element
Check tubing system
Entry temperature falls Heating is switched off
Heater plug is unplugged
Fuse has blown Switch on heating
Insert heater plug
Replace fuse (12.5 A)
Exit temperature falls No heating
Spraying too powerful Follow measures under “Fall of entry
temperature”
Reduce production rate of peristaltic
pump
Exit temperature rises Nozzle blocked
Hose not dipped into stock solution
Change of concentration in stock
solution
No feed of product Clean the nozzle by actuating the
cleaning button or by switching on
cleaning nozzle
Increase number of pulses for the
nozzle cleaning activity
Dip hose into product
Agitate product (magnetic agitator) to
obtain uniform concentration
Switch on peristaltic pump