PROALL G Series, Operator'S Manual

Page: 30 / 59

MX05001
5-2
Rev.
1
3 March 2022
Step 3: Sand Weight per Count
Determine the weight of sand that must be
released per count. Using your mix design,
establish the required weight of the sand to
produce one unit volume of mix.
1. Turn the cement motor off by moving lever
to bypass.
2. Fill the bin at least ¼ full.
3. Determine the empty weight of the
container being used to collect the sand
sample.
4. Adjust control gate to the setting taken from
the ‘Sample Data Chart’ Found at the end of
the calibration section.
5. Run the conveyor belt by pressing button 8
on the Operating keypad until sand is being
discharged off the end of the conveyor.
6. Zero the counter and place the sample
container under the discharge ring.
7. Run the conveyor until the sample container
is full, ensuring that all material being
discharged is collected.
8. Read the meter and record the value.
9. Weigh the container and sample together
for total weight.
10. Subtract the container weight from the total
weight to obtain the sample weight. Record
the sample weight.
11. Divide the sample weight by the meter
reading to calculate the
weight of sand per
count that has been discharged.
12. Adjust the control gate and re-sample until
the
weight of sand per count is equal to the
amount established in the stone formula.
NOTE: After the control gate has been adjusted,
the conveyor must be run until the adjusted
material flow is past the discharge point.
Disregard the material released during this
operation and re-zero the meter.
Equation 3. Sand Formula
𝑀𝑖𝑥 𝐷𝑒𝑠𝑖𝑔𝑛 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑆𝑎𝑛𝑑 𝑝𝑒𝑟 𝑈𝑛𝑖𝑡 𝑉𝑜𝑙𝑢𝑚𝑒
𝐶𝑜𝑢𝑛𝑡𝑠 𝑝𝑒𝑟 𝑈𝑛𝑖𝑡 𝑉𝑜𝑙𝑢𝑚𝑒 (𝑓𝑟𝑜𝑚 Step 2: )
= 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑆𝑎𝑛𝑑 𝑝𝑒𝑟 𝐶𝑜𝑢𝑛𝑡
NOTE: Once a gate setting is established, check it
by taking a minimum of (3) three samples.
Results
Mix # (Operator’s Reference)
Strength Required
Counts per Unit Volume
Sand Gate Setting
After calibrating using weight it is recommended
that the yield of each mix be verified by batching
concrete into a yield box (container of known
volume) and comparing the result with that
displayed by the meter. Small adjustments in the
gate settings may be necessary to produce the
desired yield.
Computer Gunite Production
Calibration Procedure
Step 1: Cement Output per Auger Count
Determine the ‘cement output per count of the
cement auger.’ Each count is registered and
displayed on the mixer computer (refer to mixer
Control System manual.)
Cement calibration using this method no longer
requires bin materials to be emptied as the
conveyor is not required to run when calibrating.
Cement is calibrated based on the output of the
cement auger only. This value should be linear at
normal operating speeds.
NOTE 1: The larger the sample you can measure,
the lower the error will be.
NOTE 2: Samples taken from a newly filled
cement bin should not be used to calibrate the