Brookfield BF35 Manual do Utilizador descarregar pdf (Página 17)

Brookeld Engineering Labs., Inc. Page 17 Manual No. M13-10000

Section 6 - Operation

Operation

Measuring Viscosity:

1. Mix the sample on the “STIR” setting for 10 seconds while heating or cooling

the uid. Monitor the temperature with a thermometer. Continue to mix until

the sample reaches the target temperature.

2. Rotate the knob to one of the speed settings. When the dial reading stabilizes,

record the reading and the temperature. Repeat this step for any other speeds

that your test requires.

Always start with the higher RPM and work your way down to the lowest RPM.

For example, if you need readings at 100 RPM, 200 RPM, and 300 RPM, record

the measurement at 300 RPM rst, then 200 RPM, then 100 RPM, then gel

strengths (if necessary).

Measuring Gel Strength:

1. Mix the sample on the “STIR” setting for 10 minutes.

2. Rotate the knob to “GEL” and immediately shut off the power.

3. As soon as the sleeve stops rotating, wait 10 seconds and turn the power back

on while looking at the dial. Record the maximum dial deection before the gel

breaks. This is the 10 second gel strength.

When measuring gel properties, the dial does not have to return to zero during

the quiescent period. Therefore, it should not be forced back to the zero setting

if it does not freely do so. When determining the maximum dial deection, no

allowance needs to be made if the dial did not start at zero. Only the maximum

dial deection is of interest. Rheological properties and characteristics of the

sample will determine if the dial returns to zero during the quiescent periods of

the gel measurements.

4. For the 10 minute gel strength, re-stir the uid and wait 10 minutes before

recording the maximum dial deection.

API Testing:

1. Mix the sample on the “STIR” setting for 10 seconds.

2. Set the speed to 600 RPM. Wait for the reading to stabilize and then record the

dial reading and temperature.

3. Set the speed at 300 RPM. Wait for the reading to stabilize and then record the

dial reading and temperature.

4. Stir the sample again for 10 seconds.

5. Set the speed to “GEL” and immediately shut off the power.

6. As soon as the sleeve stops rotating, wait 10 seconds and turn the power on while

looking at the dial. Record the maximum dial deection before the gel breaks.

This is the 10 second gel strength.

7. For the 10 minutes gel strength, re-stir the uid and wait 10 minutes before

recording the maximum dial deection.

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Brookfield BF35 Manual do Utilizador Página 17