EATONAerospace Group TF100-104E May 2013 3 Mating Transducers The Digital II Pressure Control System requires the use of Eaton part number 64108 Transducer/Cable Assembly for each Model 64235 Control Module used. In addition, during the calibration or setup of the system at the test rack, one 64101 Transducer/ Cable Assembly is required for each 64235 Control Module. Where a permanent test rig is available, the transducer can be left installed on the test rig at the location simulating the aircraft manifold pressure. If no test rig is available then the bottom adapter on a refueler can be setup to have a quick disconnect fitting to which the transducer can be installed during calibration. Note that in all cases, the transducer should be protected against thermal expansion. The transducer is rated for 200 psi (13.789 bar) and has a burst pressure of 300 psi (20.684 bar), but that is easily achievable by approximately 30°F (16.6°C) temperature change. Transducer installation requires some precautions as noted in the installation instructions provided with each system. Vehicle Mounted Transducer The 64108 Transducer/Cable Assembly is furnished with various lengths of cable to suit the installation. The length is specified by adding a dash number equal to the desired length from 5 to 50 feet in increments of 5 feet. Example: 64108-40 has a 40 foot length of cable. The connector that mates to the transducer is provided on one end of the cable and other end is bare wire for installation into the 64235 module. The mounting is achieved by means of a ¼ inch male NPT. The electrical connector is furnished as a part of the wiring. Test Rig Equipment Transducer(s) — This test rig unit is furnished with 25 feet of cable and the connector to mate to the 64235 Control Module. A grounding clip is also furnished on the cable and should be attached to the test rig during calibration. One 64101 Transducer/Cable Assembly is required for calibration for each system on the vehicle for each airport. That is, if the vehicles have a single control module then only one cable assembly is required per airport. The transducer portion of the assembly can be left installed in the test rig as long as thermal expansion protection is provided. If there is no test rig and the system is calibrated by recirculating into the bottom loading system of the refueler, the transducer can be mounted to the pressure tap on the vehicle by using a dry break disconnect. Mounting is by means of a ¼-inch male NPT. Calibration Equipment Model 64236 Hend-Held Calibration Unit — one per vehicle system required per airport. The Hand-Held Calibration Unit is used to calibrate the system on the test rig. It replaces all switches and operator choices previously used on the early digital system. This unit should be kept in a safe place by the station manager between calibrations and used only by authorized/trained personnel. A spare transducer cable is shipped with the 64236. Component Information 64101 Transducer/Cable Assembly 64108 Transducer/Cable Assembly Transducer Cable for test rig RS232 cable for calibration unit 64236 Hand-held Calibration Unit
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