TM 5-3895-374-24-1
GP470FA
F. INSTALLATION
CONTROLLER
The controller assembly is available in two models. The DPS-300 is a stand alone unit and should be placed on a flat
surface convenient to the operator. The DPS-310 is a panel mount unit and requires a 4-1/2" high x 6-3/4" wide cutout.
Reference figure 2 for detailed dimensions.
PRESSURE TAP
Depending on the burner/blower orientation, the pressure tap can be located in a 10 o’clock or 2 o’clock position with a top
feed conveyor or above the horizontal centerline with a bottom feed conveyor. Avoid locating the tap directly in back of a
top feed conveyor to prevent material from acting as a filter in sensing dryer suction.
Cut a hole in the dryer breeching large enough to accommodate a 1" pipe coupling. In addition to the above location
constraints, the hole for the pipe coupling should be centered on the breeching midway between the outer edge of the
breeching and the outer edge of the combustion chamber or shell. On a drum mix plant, the tap can be parallel with the
centerline of the dryer, while on a batch plant it is advisable to slant the tap at a downward angle to the dryer centerline to
prevent aggregate from collecting in the pipe coupling.
Bush the pipe coupling to accept a 1/4" copper tubing sensing line. Carefully route the tubing to the transmitter, keeping
the line as short as possible and avoiding hot spots along the breeching. Connect the tubing to the transmitter manifold.
TRANSMITTER AND MANIFOLD KIT
The transmitter must be mounted on a vibration free support and shielded from direct flame radiation. The operating
temperature range is 0 to 1600F. Bolt or weld the transmitter mounting bracket to the support BEFORE mounting the
transmitter to the bracket. Connect the transmitter manifold to the HIGH pressure tap when using the -0.8 to +0.2" wc
transmitter. The LOW pressure tap is left open to atmosphere as a reference.
On applications using a 0.0 to -1.0" wc or 0.0 to -3.0" wc transmitter the manifold is connected to the LOW pressure tap
and the HIGH tap is left open. In either case, the open tap must be shielded from wind and other disturbances and should
not be in a position to collect dirt or water. The manifold moisture drain should be positioned vertically down.
INTERCONNECTING WIRING
Refer to figure 3 for wiring details. Remove the top (2" x 2.5") cover from the transmitter to access the transmitter terminal
strip. Note that polarity is marked on the cover plate. The 4-20mA signal from the pressure transmitter to the controller
should be run via a shielded, twisted pair cable with the shield grounded at one end only. This cable should be separated
from all AC control and power cables to prevent signal interference.
(page 3-36)
