Traditional Gunite Production Calibration Procedure; Step 1: Cement Output Per Conveyor Count; Step 2: Counts Per Unit Volume Of Mix - PROALL G Series Operator's Manual

5. Calibration
The calibration of the mixer is the process that
determines the control gate setting and the
meter count required to produce a certain mix
specification. A predetermined "mix design" is
used as the guide for the calibration procedure.
NOTE: The volume is shown in the following
sections as "unit volume" and refers to the
volume in the standard units of measurement for
the region and may refer to cubic meters, cubic
yards, or other units of measurement being used.
Traditional Gunite Production
Calibration Procedure

Step 1: Cement Output per Conveyor Count

Determine the 'cement output per count of the
conveyor.' Each count is registered and
displayed on the mixer computer (refer to mixer
Control System manual.)
NOTE: The larger the sample you can measure,
the lower the error will be.
NOTE: Samples taken from a newly filled cement
bin should not be used to calibrate the cement
because its bulk density does not reflect real
working conditions where cement has been
allowed to settle and compact. Ensure the
cement is settled by driving the mixer or vibrating
before samples are taken.
NOTE: On a new mixer, cement calibration
should be confirmed after 500-unit volumes of
mix have been produced.
1. Empty material from the sand bin, the
cement bin should be at least 1/2 full.
2. Discharge an adequate amount of cement to
ensure that the cement metering system is
Rev.
1
full by pressing button 8 – Cement Feed - on
the Operating Keypad (refer to page 4-3.)
3. Determine the empty weight of the
container being used to collect the cement
sample.
4. Zero the meter and place the container
under the hopper.
5. Run the conveyor until the sample container
is full, ensuring that all material being
discharged is collected.
6. Weigh the container and sample together
for total weight.
7. Subtract the container weight from the total
weight to obtain the sample weight. Record
the sample weight.
8. Divide the sample weight by the number of
counts shown on the meter to determine the
cement output per count.
Equation 1. Cement Formula
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NOTE: Collect and weigh a minimum of (3) three
samples to ensure they are consistent.

Step 2: Counts per Unit Volume of Mix

Determine the number of counts required to
deliver the specified weight of cement powder
per cubic meter or cubic yard of a mix as needed
in your mix design.
Equation 2. Count Formula
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3 March 2022
MX05001