Water bath constant temperature oscillatorIt has multiple oscillation modes that can be selected according to experimental needs. The oscillation frequency and amplitude can be adjusted to meet the requirements of different experiments for mixing effects.

Water bath constant temperature oscillatorHow to deal with the following faults?

1. Abnormal heating

No heating, normal oscillation

Possible reasons: damage to the heating tube, malfunction of the temperature control circuit board, and failure of the relay.

Handling method:

Check if the heating tube is open circuited, and replace it if it is damaged.

Test the output signal of the temperature control circuit board. If there is no signal, replace the circuit board.

Check if the relay contacts are stuck or burned, and replace them if necessary.

Heating is normal, but the temperature fluctuates greatly

Possible reasons: incorrect cooling mode setting, sensor moisture or damage, poor relay contact.

Handling method:

Reset the cooling mode according to the instructions.

Replace temperature sensors that are damp or damaged.

Clean or replace relay contacts.

The measured temperature is too high and an over temperature alarm is triggered

Possible reasons: The starting temperature is set too high and the ventilation is not smooth.

Handling method:

Reduce the set temperature of the thermostat.

Open the ventilation hole on the back of the instrument or activate the cooling function.

2. Abnormal oscillation

The oscillation cannot work, but the heating is normal

Possible reasons: Drive belt detachment, drive motor malfunction, transformer damage, burnt speed control circuit board.

Handling method:

Check if the drive belt is loose or broken, reinstall or replace it.

Measure the input (220V) and output (12V) voltage of the transformer with a multimeter. If there is no output, replace the transformer.

Check if the carbon brush of the motor is worn, and replace the motor if necessary.

Observe whether there are burn marks on the speed control circuit board and replace the damaged circuit board.

Slow oscillation speed

Possible reasons: displacement of speed control resistor, wear of transmission motor carbon brush, and rusting of mechanical parts.

Handling method:

Adjust the adjustable resistor on the speed control board.

Replace worn motor carbon brushes.

Lubricate or rust the mechanical parts.

High operating noise

Possible reasons: uneven placement of the instrument, loose porous tray, and worn bearings.

Handling method:

Adjust the instrument foot pad to ensure smooth placement.

Tighten the screws of the porous tray.

Add lubricating grease to the bearings.

3. Display and control anomalies

The panel has no display and is not functioning

Possible reasons: power not connected, blown fuse, damaged power switch.

Handling method:

Check if the power plug is securely plugged in and if the power cord is open.

Replace the fuse with the same specification.

Test the continuity of the power switch and replace it if necessary.

Abnormal display on temperature controller

Possible cause: Open circuit or short circuit of temperature sensor.

Solution: Replace the temperature sensor and check if the connection between the sensor and the circuit board is secure.