PROALL G Series, Operator'S Manual

Page: 31 / 59

MX05001
5-3
Rev.
1
3 March 2022
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 3: On a new mixer, cement calibration
should be confirmed after 500 unit volumes of
concrete have been produced.
1. The cement bin should be no less than 1/2
full.
2. Discharge an adequate amount of cement to
ensure the cement metering system is full by
pressing button 8 - Cement Feed
– (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 cement auger 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.
8. Enter the weight and count values into the
computer.
Equation 4. Cement Formula
𝑆𝑎𝑚𝑝𝑙𝑒 𝑊𝑒𝑖𝑔ℎ𝑡
𝐴𝑢𝑔𝑒𝑟 𝑀𝑒𝑡𝑒𝑟 𝐶𝑜𝑢𝑛𝑡
= 𝐶𝑒𝑚𝑒𝑛𝑡 𝐴𝑢𝑔𝑒𝑟 𝑂𝑢𝑡𝑝𝑢𝑡 𝑝𝑒𝑟 𝐶𝑜𝑢𝑛𝑡
NOTE: Collect and weigh a minimum of (3) three
samples.
Step 2: Counts per Unit Volume of Mix
The computer will calculate the required counts
per unit volume based on the calibration data
entered. This is done in the mix entry screen
after calibration (see Control System manual.)
Step 3: Gate Calibration
Determine the weight of sand that is released
per count of the conveyor. The computer will
generate the curve for gate height (wheel
position) vs. weight per count based on the data
entered. Gate calibration can be done at various
gate heights up to a total of 3. The calibration
data should be entered at progressively higher
gate heights (ie. 3, 5, 7). You must have at least
two gate heights in the calibration data for the
computer to calculate the curve.
Equation 5. Aggregate Formula
𝑆𝑎𝑚𝑝𝑙𝑒 𝑊𝑒𝑖𝑔ℎ𝑡
𝐶𝑜𝑛𝑣𝑒𝑦𝑜𝑟 𝐶𝑜𝑢𝑛𝑡
= 𝐺𝑎𝑡𝑒 𝑂𝑢𝑡𝑝𝑢𝑡 𝑝𝑒𝑟 𝐶𝑜𝑢𝑛𝑡
1. Place lever in Cement bypass mode.
2. Fill aggregate bin at least ¼ full.
3. Determine the empty weight of the
container being used to collect the sample.
4. Adjust control gate to the calibration height
being sampled.
5. Run the conveyor by pressing button 8 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.
11. Enter the weight and count values into the
computer for up to three samples per gate
height.