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5. The sampler controller may be wired to operate the sampler whenever the pump is running, or to cycle the
sampler only when the pump is running in the loading direction . Where the truck pump is used to unload milk
or to discharge cleaning solution, it may be useful to operate the sampler whenever the pump is running . The
ISOLOK MSA sampler can be used to sample an entire truck load, and the sampler will be partially sanitized during
cleaning solution discharge .
6. BIDIRECTIONAL OPERATION is accomplished by splicing two wires (black/white) from the power supply directly
across the motor leads (i .e ., in parallel with motor leads T1 and T4) .
7. SINGLE DIRECTION OPERATION (loading only) is obtained by wiring two leads (black/white) from the power supply
to one of the following motor lead combinations:
MOTOR CLOCKWISE ROTATION - Connect to T4 and T5 (or) to T4 and T8
MOTOR CCW ROTATION - Connect to T4 and T5 (or) T1 and T8 .
8. Make certain that all connections are secure and that splices are properly insulated . Close the drum switch and
motor junction box before connecting the power .
9. Connect the 12VDC output of the AC power supply to the sampler controller using wire with female push-on
connectors on both ends . Plug one end into the 1/4-inch spade receptacle located on the power supply and the
other end into the identical receptacle in the back of the sampler controller . Check for ground continuity between
the power supply module and sampler controller box . Route the wire to protect it from damage or vibration .
 NOTE
Within the motor junction box, either T5 or T8 normally will be connected to T2 and T3 . Select a combination of motor leads
so that the sampler is NOT wired into this connection .
Polarity
The 12VDC output from the AC power supply is positive . The controller is wired for operation on "hot" positive with
negative to ground . If the sampler controller does not cycle when 230 VAC is ON to the power supply, check the
ground continuity from the power supply base to the compartment wall . Also, check connections on the wire lead
from the power supply to the sampler controller box .
Air Supply Connection
A source of compressed air is required at 50 psi (344 KPa) minimum, up to 120 psi (827 KPa) maximum . The air supply
and piping selected should be capable of providing up to 1 cubic foot of air per minute of sampler operation . The air
supply should be reasonably clean and free of water .
 NOTE
Route air line inside dry compartment away from interference with belts, pulleys or other equipment that could cause
damage . Always use flexible tubing inside the dry compartment to isolate the sampler controller from the weight and
vibration of hard metal piping .
This air supply can be obtained from one of two alternate sources:
1. TRUCKS WITH AIR BRAKE SYSTEMS: The small amount of air needed for sampler operation usually can be taken
from the air reservoir of the vehicle . If an air supply package has been selected with the sampler system, it includes
air tubing and commonly needed fittings . Alternately, tubing and fittings can be obtained locally .
a. Examine the air brake reservoir tank(s) and locate a connection point near the top of the tank, high enough to
prevent accumulated moisture or water from flowing into the supply line .
ISOLOK MSA Sampler
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