Brookfield LFRA Texture Analyzer - Manual (Page 15)

Brookfield Engineering Labs., Inc. Page 15 Manual No. M/05-370-A1205
Start the calibration verification process by using the Select / Scroll knob to set the test mode to
Static Load and then press the Start button. The display will request that you attach the Hanger
Mount to the Probe Shaft (see Figure III.8); then press Start. The LFRA must now be zeroed by
pressing the Start button.
Note: The Start button may be used to zero the LFRA at any time during the Static Load
test. If you remove the weights and Hanger and the display does not return to zero,
press Start to zero. Be sure to remove the weights and Hanger prior to zeroing the
LFRA.
The display will change to show Static Load active parameters once the zero process is complete
(see Figure III.9). The Hanger should be fixed to the Hanger Mount. The Base Table must be
adjusted to the lowest position to allow the Hanger to be placed on the Hanger Mount.
Note: The Hanger is part of the calibrated weight set, and it has a calibrated weight value.
This weight must be included as part of the total weight applied to the load cell.
Figure III.9
Attach the desired weight to the Hanger and record the load value from the display. Multiple
weights may be attached to the Hanger to achieve a range of test points. Brookfield recommends
verifying calibration at a minimum of three points over the range of the LFRA (check the instru-
ment serial tag for the load range).
Do not apply excessive upward, downward or sideways force to the Hanger Mount or
Hanger while adding or removing weight. This may damage the sensing mechanism
of the LFRA.
The LFRA should show the appropriate weight value within the specified instrument tolerance.
The accuracy of the LFRA is defined by the rating of the load cell as detailed in Table III.2. If
the LFRA Texture Analyzer produces data outside of the acceptable range, contact Brookfield or
our authorized representative for information on repair/calibration services (see Appendix C for
Brookfield locations).
Load Range Load Accuracy
Model Grams Grams
LFRA-100 0 – 100 0.5
LFRA-1000 0 – 1,000 5.0
LFRA-1500 0 – 1,500 7.5
LFRA-4500 0 – 4,500 22.5
Table III.2