Possible troubles in the process of using desktop vacuum drying oven and its treatment
Fault phenomenon
Reasons
Approach
No power on boot
No power outlet
Check if the line is tripped and the outlet is good
The power cord plug is not plugged in or disconnected
Reinsert or repair the power cord
Fuse tube is not installed or broken
Check the vacuum box circuit no short circuit, more fuse tube (instrument power transformer short circuit, the heater short circuit, grounding short circuit causes the fuse to blow).
Instrument PV screen display
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The temperature sensor Pt100 is bad
Check Pt100 for replacement ( 0 °C to 100 Ω , 0.3 Ω / °C )
Temperature sensor wiring disconnected
Reconnect
Instrument measurement range is wrong
Reset
Do not warm up
Low temperature setting
Set temperature SV ≥ RT+10 °C
RT is (ambient temperature)
The output circuit of the instrument is disconnected
Reconnect
Temperature controller has no output signal or bad or SCR bad
Exchange
Electric heater bad (open circuit, short circuit)
Exchange
Do not warm up
Enable timing or incorrect settings
ST=0 or ST= (heating + constant temperature) time
Temperature out of control or set temperature and measurement temperature error overshoot resulting in static error, overshoot
Temperature controller output is out of control
3041 or bad BTA , exchange
Does not meet the conditions of use
SV ≥ RT+10 °C
Pt sensor bad contact
Clear contact resistance
The relevant parameters are set incorrectly
Reset the relevant parameter example P, etc.
Measuring temperature and
The actual temperature in the box is too bad
No vacuum
Vacuum degree
Measure the mercury temperature sensor on the shelf
Reposition
Instrument or parameter changes
Re-correct SC , HL parameters
Can't vacuum
Vacuum pump selection model specifications are wrong
Should choose pumping rate not less than 2 liters per second
Various connection tubes (heads) are loose and the inner diameter is too small
Re-select the appropriate inner diameter connecting pipe, fastened at the joint
Vacuum table is bad
replace
The door is not closed
Adjust the buckle distance
Door seal rubber aging loses its elasticity
Replace door seal
Vent valve, vacuum valve position is wrong
Adjust position
Fault phenomenon
Reasons
Approach
Can't vacuum
Bad solenoid valve ( 6090 , 6210 )
Replace solenoid valve
Leakage
( 24 hours vacuum
From -0.1Mpa to
Greater than -0. 092Mpa )
Various connection pipe leaks
Replace after inspection
In addition to type 6050 , 6050B , 6051 and 6053 , the deformation of the heater “ O †type seal ring is not compressed.
Tighten the heater base with the Allen key (on the back of the liner) or replace the " O " ring
The valve is not positioned correctly
Place the correct position
Vacuum valve leak
Exchange
Solenoid valve leaks tightly (for type 6090 , 6210 )
Exchange
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