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Sentry Equipment Corp
Appendix: Installation & Operation on a Milk Truck
Sampler and Controller Installation
Please see the “Installation” section of this manual for general installation and sampler controller installation
instructions .
When selecting a location on a milk truck, a typical location is on the ceiling or side wall of the motor compartment, as
close to the sampler location as possible . Otherwise, follow the general controller installation instructions .
Electrical Power Connection
Please see page 10 of this manual for general electrical power connection . The following is specific to power
connection on a milk truck .
This parts package is used with a 12 volt power supply . Install this electrical supply using the following steps:
1.
Attach insulated, stranded wire (No . 18 AWG or larger) to a non-switched terminal, such as a non-grounded battery
terminal or equivalent .
2.
Run wire lead to the 1/4 in spade-type terminal [+] on back of the cycle controller . Route wire along chassis to give
it protection from accidental damage .
3.
Semi-trailer units will require a disconnect between the tractor and trailer . If the existing disconnect has an unused
pin, run the power lead through this pin . Alternately, if two pins are used for similar circuits (e .g ., left clearance
lights on one pin, right side on another), consider combining both into one connection and using the remaining
pin for the sampler power lead .
AC Power Supply Package
This parts package is used with 230 VAC supply and rectifies and transforms 230 VAC to 12 VDC (at 1/2 amp) to supply
the sampler controller . Interlocking to 230 VAC electrical service also automates the “start-stop” sampling function .
Disconnect any 230 volt power supply from the truck before making any electrical connections .
Install the AC electrical supply using the following steps:
1.
Locate the power supply in an equipment cabinet convenient to both the sampler controller and pump motor
reversing switch . The power connection is a 36-inch length of flexible SJO cord, complete with metallic fitting and
conduit lock-nut .
2.
Mount the power supply using two brackets attached, or remove the cover to locate mounting holes within the
enclosure using your drawing as a template . Drill holes to accept fasteners selected and secure the power supply
enclosure .
3.
Examine the motor conduit box or motor drum switch . The power cord fitting is mounted through a 1/2-inch
conduit knock-out . If none can be found, a 7/8-inch diameter hole can be drilled or punched through the conduit
box or drum switch cover, whichever allows a clean mounting of the power supply connector without becoming
an obstruction .
4.
Insert the wires and cord connector through the hole and place a conduit nut on the fitting, locking firmly .
PROVIDE A SUITABLE GROUND CONNECTION TO POWER SUPPLY . Check ground continuity after mounting .
