Shanghai vacuum drying box failure solution
In the process of using the vacuum drying oven, more or less will encounter large and small faults, do you understand the solution to the vacuum drying oven in Shanghai ? Below, Dongsheng Instrument introduces the solution to the problem of Shanghai vacuum drying oven :
Fault phenomenon
Reason speculation
Approach
Power on without power
External power outlet has no electricity
Check if the line is tripped, is the socket good?
The power cord plug is not plugged in or disconnected
Reinsert or repair the power cord
The fuse is not installed or broken
Check that there is no short circuit in the vacuum box, and the fuse tube is shorted (the instrument power transformer is short-circuited, the heater is short-circuited, and the ground short-circuit causes the fuse to blow).
Meter PV screen display
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Temperature sensor Pt100 is bad
Check Pt100 and replace ( 0 °C for 100 Ω , 0.3 Ω / °C )
Temperature sensor wiring off
Rewiring
Meter measurement range is wrong
Reset
Not warming up
Low setting temperature
Set temperature SV ≥ RT+10 °C
RT is (ambient temperature)
Instrument output circuit wiring is off
Rewiring
The temperature controller has no output signal or bad or thyristor
Exchange
Electric heater is bad (open circuit, short circuit)
Exchange
Not warming up
Enable timing or incorrect settings
ST=0 or ST= (heating + constant temperature) time
Temperature out of control or set temperature and measured temperature error is out of tolerance to generate static difference, overshoot
Temperature controller output is out of control
3041 or BTA is bad, change
Does not meet the conditions of use
SV ≥ RT+10 °C
Poor contact of Pt sensor
Clear contact resistance
The parameter setting is incorrect.
Reset the relevant parameter example P, etc.
Measuring temperature and
The actual temperature in the box is out of tolerance
No vacuum
Vacuum degree
Measuring the mercury thermometer is not on the shelf
Reposition
Meter or parameter change
Re-correct SC and HL parameters
Can't vacuum
Vacuum pump selection model specifications are wrong
The pumping rate should be no less than 2 liters / sec
Various connecting pipes (heads) are loose and the inner diameter is too fine
Re-select the appropriate inner diameter connecting tube and fasten the joint
Vacuum gauge is bad
replace
The door is not closed
Adjust the door distance
Door seal rubber aging loses elasticity
Replace the door seal
The position of the purge valve and vacuum valve is incorrect.
Adjust position
Can't vacuum
Solenoid valve is bad ( type 6090, type 6210 )
Replace the solenoid valve
Air leak
( vacuum within 24 hours
Down by the -0.1Mpa
Greater than -0.192Mpa )
Various connecting pipes leaking
Replace after inspection
Except for 6050 , 6050B , 6051 , 6053 type, the heater " O " type seal is deformed and causes no compression.
Tighten the heater base (back of the liner) with an Allen key or replace the “ O †seal
The bleed valve is not in the correct position
Place the correct position
Vacuum valve leak
Exchange
Solenoid valve is not leaking tightly (applicable to 6090 , 6210 )
Exchange
The above is the Shanghai Donghao instrument manufacturer introduced the Shanghai vacuum drying oven troubleshooting method , but also want to know more technical knowledge, please enter the Dongpu instrument main station to contact sales and after-sales personnel.
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