9
benzoic acids is calculated and compared with the standard calorific value, and the error
is less than 120J, which means that the calibration is successful.
(7) Calorific value measurement
Weigh the sample (0.9 ~ 1.1g), load the oxygen bomb, charge oxygen for 15 ~ 45
seconds, pressure is 2.8 ~ 3.2Mpa, put it into the inner cylinder, click "calorific value test",
the instrument will start calorific value measurement, input the weight of weighed sample,
input the weight of additive, if there is no additive, you can input 0. The results are
displayed and printed after the test.
VII.Common faults and troubleshooting
phenomenon
reason
handle
1
、
Oxygen bomb
leak
Aging or wear of rubber sealing ring Replace the sealing ring
2
、
Ignition failure
①
The circuit is blocked or the
ignition wire is in poor contact
②
The sample is wet
③
Poor contact between ignition
wire or cotton thread and sample
④
The two electrodes are too dirty
⑤
Oxidation of ignition cap
⑥
The two electrodes are short
circuited with the crucible (it is easy
to burn the crucible and electrode at
this time)
①
Check whether the wiring is well
connected, whether the oxygen
warhead is in good contact with the
ignition cap, and whether the oxygen
bomb is placed properly
②
The sample is splashed with
oxygen too fast
③
Re sample
④
Sand the electrode with
sandpaper
⑤
Sand the ignition cap oxide with
sandpaper
⑥
Replace the electrode or crucible
and re load the sample
3Incomplete
combustion of
sample
The sample is not flammable
Insufficient oxygen or insufficient
oxygen pressure
Wrap the sample with lens wiping
paper, extend the oxygen filling time,
and replace the oxygen cylinder
4
、
After ignition,
the temperature
rises too high and
the calorific value
is too high
①
Agitator does not work
②
Mixing blade falling off
①
The mixing shaft is stuck and the
line is blocked
②
Insert a cotton into the nylon rod
connected with the mixing shaft and
insert it again
5
、
The test did not
end for a long time
The ambient temperature is too
high
Adjust the water temperature of the
outer cylinder to the room
temperature, or lower the indoor
temperature
6
、
Air leakage of
oxygenator
Aging or wear of sealing ring of
oxygenator
Replace the sealing ring
