OFITE, 11302 Steeplecrest Dr., Houston, TX 77065 USA / Tel: 832-320-7300 / Fax: 713-880-9886 / www.ote.com 15
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 seconds.
2. Rotate the knob to “GEL” and immediately shut o 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 deection
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 deection, no allowance needs to be made if the dial did not start
at zero. Only the maximum dial deection 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 deection.
To Next Page
Loading...
