2 EATONAerospace Group TF100-104E May 2013 Eaton’s Carter product line of ground refueling equipment includes the Digital II Pressure Control System, which employs a patented* method of monitoring fluid pressure and controlling pressure at the aircraft. It combines two well-known technologies, as did Carter’s first generation (Digital I) pressure control system. The combination of hydro-mechanical valving and a microprocessor eliminates the need for air-reference pressure, servo controls or springs to control pressure. Fuel cannot leak into the air system such as occurs in some air operated systems. Adjustments for pressure control, rate of flow control, opening and closing times are made on a hand-held unit that is plugged into an RS232 port on the bottom of the control module. Once the calibrations and adjustments have been made, the hand-held unit can be unplugged and stored by the maintenance manager. Only one hand-held unit is required as a setup unit, regardless of the number of systems being used by an operating group. (Two handheld units are required if two Digital II systems are used on any one vehicle). Once the hand-held unit is removed, the operator cannot make any further changes. There are no buttons or key locks on the control module, unlike the first generation Digital Pressure Control System design. Extensive cost savings can be achieved on fuel vehicles using this system. For example, it does not require items such as air compressors, air tanks, dryers, air regulators and gauges. Hundreds of fittings, as well as exhaust valves, Synflex tubing, steel tubing and venturis are also eliminated. Because there are fewer components, labor costs for installation are also significantly reduced. Higher flow rates can be achieved due to lower system pressure drop. Test time can also be reduced and flow meter checks can be verified quickly during any fueling operation. When the system is used on a hydrant servicer only, one fuel control line has to be run to the pressure control coupler, whereas both fuel and air lines are required on an airoperated system. Indicator lights on the control module denote which nozzles are being used and the units of measure for the pressure settings and the rate of flow. Remote displays can be procured to provide readouts for various locations on the vehicle. Both LCD and LED units are available depending upon your need. A master switchable remote can be used to provide individual readouts for primary and secondary systems when two control modules are used. Features yy No venturi(s) required yy No air reference pressure required yy No fuel-to-air leakage yy Maximum rate of flow control standard. No rate of flow valve required. yy Displays nozzle pressure and flow simultaneously yy Indicator lights show which nozzles are being used yy Choice of LCD or LED remote displays available Design Concepts 64237 Remote Display System Components (Each purchased separately) yy 64235 — Control Module yy 64236 — Hand-held Calibration Unit yy 64101 —Test transducer yy 64108 — Permanent system transducer yy 64302, 64303 or 64304 — Solenoid Manifold for pressure control coupler operation yy 64902 — Digital 4-inch Pressure Control Coupler yy 64802/ 64804 — Digital 3-inch Pressure Control Coupler yy 64504 — Digital 3-inch Inline Valve yy 64505 — Digital 3-inch Bypass Valve yy 64514 — Digital 4-inch Inline Valve yy 64515 — Digital 4-inch Bypass Valve yy 64237 — LCD/64338 LED Remote Displays yy 64337 — LED switchable Remote Display yy A switchable remote available on dual systems to show primary and secondary system information — also blocks out primary when secondary information is shown yy Three types of pressure and flow readouts on the module (e.g. psi, kpa, bar) yy Adjustable timer deadman — standard yy Deadman warning light on top of control box yy Error message readout to assist with trouble shooting yy Field replaceable PC boards yy System can be used with inline or bypass valves and pressure control couplers yy Cast aluminum box and cover with backlighted Lexan panel yy All calibrations done on a removable hand-held unit. No adjustments on main box. yy Six hose combinations can be individually calibrated yy Can receive inputs from two meters simultaneously yy System is programmable through an RS232 port * U.S. Patent. No. 5,660,198
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