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The cylinder block (1) crankshaft housing (2), and injector head (3) comprise
the body of the Smith MEASUREMIX Model R-4. The water inlet (4) is threaded for 1-inch pipe for
connection to the water source. The fertilizer intake tube (5) is made of translucent plastic tubing
to allow visual flow check. The intake tube is normally 6 feet long but may be supplied longer if desired. The
intake check valve (6) of the double-ball type is shown in the illustration (optional check valves have
a different appearance). The discharge check valve (7) is similar to the intake check valve. The outlet
(8) for water-fertilizer mixture is a 1-inch pipe elbow. The priming valve (9) lets water into
the injector system for easy priming of the injector pump and is also used for quick washing of the injector
system after operation. The priming valve (10) for dip tube is also used for shutting off the fertilizer
supply during periods when the machine is not in use. The crankshaft windows (11) are made of clear
plastic, so that the motion of the crankshaft is visible. The machine runs so quietly that this is the only way
to be sure the machine is operating. The check valve insert (12) allows for easy O-ring placement.
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Standard Proportion: 1 to 100
Maximum Water Flow Rate: 20 GPM
Minimum Water Flow Rate: 5 GPM
Connection, Inlet and Outlet: 1-inch
The Smith Model R-4 MEASUREMIX weighs only 75 pounds, and is portable when mounted on a small wagon or
cart (not supplied by manufacturer). As a portable unit, the Model R-4 MEASUREMIX can be used for fertilizing
trees and shrubs around buildings, in parks, or on estates. Nurserymen have found the Model R-4 ideal for
small growing areas, or for spot-feeding in special areas. Hobbyists make good use of this model, which can
also be used for permanent installation.
The Smith Model R-4 MEASUREMIX is 12 1/2 inches high, 8 inches wide, and 13 1/2 inches long. The four mounting
bolts with spacers are suitable for mounting on a platform or baseplate up to 3/4 inch thick. Bolts are spaced
at four corners of a 4 1/2 by 5 1/2 inch rectangle. Shipping weight is 90 pounds.
STANDARD OPTION
Option C: Includes all stainless steel double-ball check valves with all other valves and fittings
of stainless steel, or plastic. Recommended for consistent use with usual inorganic fertilizer mixtures.
Contains no rubber parts.
ACID OPTIONS (SPECIAL)
Option P: Contains single-ball check valves with plastic housings and acid-resistant rubber balls.
All other items in contact with the fluid are various types of acid-resistant materials. Recommended
for units injecting any concentration of sulfuric acid for pH control. (Phosphoric acid may be
satisfactorily injected with stainless steel options.) Usually installed as one injector of a two-injector
option (see below). For more details write for special sheet AM-3.
PESTICIDE/FUNGICIDE OPTION
Option I: Includes all stainless steel double ball check valves and fittings. Contains no plastic
working parts. Recommended for consistent use with the insecticides/fungicides that contain hydrocarbon
base harmful to PVC plastics.
Special proportions: Any of the single-injector options listed above or the two injector options
listed below, may be provided with special proportions. Special proportions always available for the R-4
model are 1:200, 1:300, and 1:400, in addition to the standard 1:100 proportion. For availability of other
special proportions, write factory.
Two-injector options: All R-4 machines may be provided with two-injector options. May have one
option on one side, another on the other side. Proportions may be different on each side.
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