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4. Take the transfer hose and sanitizing equipment into the milk room . (If the agitator is on, turn it off . Check
appearance, temperature, and odor of the milk .)
5. Connect the transfer hose and power cord .
6. After milk stops moving in the tank, read and record the volume .
7. Start the milk pump . Where the sampler controller is interlocked to an electric pump motor, sampler operation
will start and stop with the pump . If not interlocked, it is important that the sampler be started and stopped
simultaneously with pump operation (sample only during milk flow) .
8. After the tank is empty and the hose is practically empty, shut off the pump and sampler . Disconnect and cap
hose; return the hose to the truck .
9. Remove the sample container, cap or closed container and place in an ice chest or approved carrier .
10. Rinse the milk tank and hose valve port .
Sampling Tips
1. Some users instruct the operator to start the farm bulk tank agitator after reading the volume (before pump-out
begins), and to allow the agitator to run until the tank is drained . The objective is to provide some milk movement,
as well as to reduce cream clingage in the tank on severely stratified loads . There is no reported difference in
sample validity between agitated and unagitated tanks when the sampler is properly used . Agitation during
pumping is naturally limited by tank design .
2. DO NOT use a control dial setting that produces less than 1 U .S . ounce (30 cc or 60 sampler cycles) . A biased
sample could result .
3. Select a sample container size that will not be filled completely, even on longest sampling times . Use care in
setting the control dial to a cycle rate that does not completely fill a container . When the container fills completely,
final sampler cycles simply "exchange" portions of milk from the line into the sampler and back into the line .
Overfull containers cannot be properly agitated before opening in a laboratory . This could cause a biased sample .
4. Some users instruct the operator to install a sample container for the next producer load as the last step before
closing the compartment doors . This can protect the discharge end of the port adapter from dust or other
contamination .
5. Inspect, clean and lubricate the sampler daily .
6. Before the sampler controller is turned on, or whenever samples are to be taken, make sure the sample collection
bottles or containers are mounted and personnel are clear of any hazard .
7. Keep the sampler controller box cover tightly closed at all times, except for maintenance or inspection, to protect
electrical equipment .
Sample Composite
Total volume of a composite sample is determined primarily by three factors with the following relationship:
1. Sampler size: On the ISOLOK MSA sampler, this volume is 0 .5 cubic centimeters . Each extend-retract stroke of
the plunger withdraws 1/2 cc of product from the line and allows it to flow into a sample container . If there is no
product in front of the plunger, no sample is taken .
ISOLOK MSA Sampler
Sample volume = sampler size x cycle rate x sampling time
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