Tru-Test Electronic Milk Meter (EMM)
Calibration Rig
Equipment required:
Tru-Test Calibration Rig, MMA00064
Potassium iodide and Kodak photoflo
Distilled water
Principle:
During milking of each cow the Tru-Test EMM separates a known and
accurate portion of the cow's milk and collects that small portion of milk in
the flask. The Milk Meter then measures how much milk is held in the flask
by measuring the height to which milk has collected in the flask. Each Milk
Meter is programmed with a calibration curve, which is used to convert
height of milk in the flask to a known volume in the flask.
The calibration curve is specific to each Milk Meter. Components such as
the circuit board and flask components cannot be freely replaced or
swapped without risking loss of accuracy.
Tru-Test Electronic Milk Meter (EMM) Mega
Test Rig
Equipment required:
Tru-Test MTR, MMA00065
Potassium iodide and Kodak photoflo
Distilled water
Principle:
The Mega Test rig (MTR) is used to check and then calibrate the complete
Milk Meter assembly. The proportion of milk getting into the flask (sample
ratio) can vary very slightly from EMM to EMM. The MTR allows the
calculation of a unique factor for each Milk Meter.
Functionality check
Before a Milk Meter can be calibrated, it must be ascertained that it is
functioning correctly. Hence the MTR will check: Motor speed, EMM stir air
admission, Barcode reading function, and Sample size. The MTR will also
prompt the operator to look for possible leaks in the EMM as these will affect
the meter’s accuracy.
Tru-Test Electronic Milk Meter (EMM) Test Rig and Servicing Overview.pdf
Fast Flow Test Rig
Equipment required:
Tru-Test Fast Flow Water Test Rig (MMA00057 or MMA00058)
Clean water
Principle:
The Fast Flow test rig works by drawing a measured amount of water
through the Milk Meter. The Milk Meter will pass or fail depending on the
results of the test. If a meter fails, disassemble and check it, then
reassemble and test it again.
