ISOLOK MSA Sampler 19
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 .
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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 .
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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 .
