Rice Lake CB-2 Concrete Batch Controller Version 2.0 - Manual (Page 82)

78 Installation/Operation Manual
10.12.4 Calculating Aggregate Moisture Content
Moisture content is specified as the percentage by weight of moisture in a sample relative to the totally dry
weight of the same sample. To determine this percentage, weigh the sample (Mw), totally dry it and weigh it
again (Md). The moisture content in percent is then:
((Mw – Md) x 100)/Md
10.12.5 Specifying Moisture Content and Absorption Factors
The absorption factor for an aggregate is a constant for that material and is specified in the material definition
process for the aggregate. The value is specified in percent using the “Absorbed Moisture” parameter in the
material database.
The moisture content for a particular aggregate may change from day to day and is initially specified in the
location (bin) definition process for the bin holding the aggregate. The value is specified in percent using the
"Total Moisture" parameter in the location database.
The current moisture content for an aggregate may be changed before batching a load or order using the
“Aggregate Moisture” item under the "EZ-Change Criticals" feature. This change will be permanent.
10.12.6 Calibrating a Moisture Probe
Moisture probes should be calibrated to the material being monitored. You will need two samples of the material,
both at known moisture contents. For accuracy, they should be as far apart as possible (oven dry and saturated
surface would be ideal). Specify the low end content level in percent (ie: 8.6% = 8.6), place the probe in the
material, wait for the reading to stabilize, and calibrate the reading. Repeat at the high end.
Specify the high end moisture content, place the probe in the second sample, wait for the reading to stabilize, and
calibrate the reading.
10.13 Reservoir Metered Water
Admin Menu
Materials
Water
MAT TYPE = METERED
MAT CLASS = PRIMARY WATER
INPUT IS “ON” WHEN EMPTY = “NO”- Blow out time required
BLOW OUT TIME = 10 SECS
INPUT IS “ON” WHEN EMPTY = “YES”- No blow out time required.
Reservoir Empty Sensor slot/bit
required under “LOCATION”.
Application Parameters
Water System
WATER RESERVOIR = YES