Introduction
Volatile samples are alcohols and acetone. Some fuels have a volatile component as well. If the sample evaporates between the weight-in and the ignition then the evaporation must be stopped otherwise the result will be low.
How to do it ?
The procedure is the standard procedure for spiking. The crucible cover disc (CAL2K-FLDS) is the spike. The CV of the cover disc must be measured if not done already.
Measure the CV of the cover disc (traditional and EASY) once
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Fold the cover-disc and weigh it into a crucible and prepare the vessel. |
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Set the ‘MISFIRE LIMIT’ =0 (to allow small CV’s) |
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Run a determination |
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Enter the obtained CV via the keyboard in ‘SPIKE VALUE’ |
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If EASY spike used: Read ‘READ LAST N_RISE’. Enter value in ‘CAPSULE RISE’ |
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Set the ‘MISFIRE LIMIT’=0.44 |
Measure the CV of the volatile sample (with traditional spiking method)
| Make sure that the ‘SPIKE VALUE’ was entered. Step ‘d’ above. | |
| Tare the empty crucible | |
| Stick the cover disc on to the crucible rim | |
| Weigh the crucible and the cover disc. | |
| This is the Spike mass. It must be entered manually with: ‘SPIKE MASS’. This enables spiking! | |
| Tare the balance | |
| Fill a syringe with the volatile liquid. Pierce a hole in the cover disc and inject a small amount of the liquid until the target weight is reached. | |
| Enter this weight as the sample mass | |
| Prepare the vessel normally. Put the cotton thread on top of the cover disc | |
| Run the sample |
The CAL3K will ignite the sample and measure the CV value. The energy (Spike mass x Spike Value) of the cover-disc is deducted automatically.
Measure the CV of the volatile sample (with EASY spiking method)
| Make sure that the ‘CAPSULE RISE’ was entered. Step ‘e’ above. | |
| Enable EASY spiking ‘SET CAPSULE EN’=YES | |
| Stick the cover disc onto the crucible rim | |
| Tare the balance | |
| Fill a syringe with the volatile liquid. Pierce a hole in the cover disc and inject a small amount of the liquid until the target weight is reached. | |
| Enter this weight as the sample mass | |
| Prepare the vessel normally. Put the cotton thread on top of the cover disc | |
| Run the sample |
The CAL3K will ignite the sample and measure the CV value. The temperature rise of the cover-disc is deducted automatically.






