product manual H-1021 H-1021_man_0709 FORCE DETERMINATION ADAPTER AND DIGITAL INDICATOR
Overview The FD-4A force measuring adapter is engineered for accurate measurement of the force in tensile stress testing in a ductility machine. The unit features a platform for test sample placement and a stationery body which houses a linear variable differential transformer (LVDT). The LVDT detects movement of the platform and displays force to hundredths of a pound through the electronic digital transducer readout unit. The FD-4A adapter is an improved version of the FD-4 apparatus.
• If you have an FD-4 adapter, it can be upgraded and the readout recalibrated to FD-4A specifications. The FD-4 does not become obsolete since you can build on your current investment. Apparatus FD-4A Adapter: The body of the FD-4A adapter is drilled on the bottom such that it can be placed directly on the pin of either the ductilometer stand or carriage. It is constructed of stainless steel for corrosion resistance and stability while it functions to protect the LVDT and keep it out of the water bath.
Installation Connections and Start-up: Carefully unpack the FD-4A apparatus. Save the box and packing materials in the event that the unit must be shipped in the future. The FD-4A adapter maybe placed on the calibration stand for hook at this time. Be sure to secure the test stand before hanging weights-refer to instructions under “calibration”. Connect the power cord to the DTR-451 Digital Transducer Readout and to a 120 VAC grounded outlet.
What to Expect During an Accuracy Check: Because of the design and construction of the FD-4A, you may observe slight differences in the readings for the same weight depending on whether it is being added or removed from the holder during calibration. Weight added may read a little low. As weight is removed, the springs will relax, but remaining weight might cause readings to be a little high. This usually amounts to about ± 0.05 pound in the higher ranges.
SAMPLE CALIBRATION VALUES Tolerance = ±1% + 2 counts POUNDS KG TOL LOW TOL HIGH 1.00 0.454 0.97 1.03 5.00 2.268 4.93 5.07 10.00 4.536 9.88 10.12 15.00 6.804 14.83 15.17 20.00 9.072 19.78 20.22 25.00 11.340 24.73 25.27 30.00 13.608 29.68 30.32 NOTES: 1. For values not shown above, use tolerance formula at top page. 2. Display should read between high and low tolerance as closely as possible to the value of the calibration weight. 3.
Notes/Caution • Do not attempt to tighten screws on or disassemble the FD-4A unit, replace parts, adjust the transformer core, make internal adjustments to the DTR-451 or perform calibration routines other than those outlined above. Doing so may necessitate factory recalibration and/or repair • The FD-4A unit, LVDT and DTR-451 digital readout unit function inter- dependently.
Specifications FD-4A Height: 4.50" Platform travel from rest position: Width: 1.73” w/ 30 lbs approx. 0.021" Length: 5.69" back travel 0.003" Weight: 5.51bs. Dia. of pin on platform: 0.250" Dia. of drilled hole (body): 0.257" Wetted parts: stainless steel types 302,303,304,17-7 PH Max submersion depth 2.125" Max tensile stress measurement: Cable to DTR unit: 30 lbs. Length: 72" Spring plates: Thickness I3GA (0.
Calibration Stand Height: 1.75" Cable Wheel: Width: 2.94" Dia: 1.75" Length: 11.50" Cable groove width: 0.063" Cable groove depth 0.063" Weight 2.2 lbs. Material: Aluminum Material: Phenolic Mounting holes will accept 1/4 dia. flat head screws Level vial accuracy: 35 arc minutes Weight Holder Base diameter: 2.80" Platform block: Base height: 0.438" Height: l0mm Material: Nickel plated steel Width: 18mm Length: 1.25" Rod diameter: 0.250" Pin hole diameter: 0.257" Length 9.
Warranty Humboldt Mfg. Co. warrants its products to be free from defects in material or workmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co., factory replacement of any part or parts of such product, for the warranty of this product please refer to Humboldt Mfg. Co. catalog on Terms and Conditions of Sale. The purchaser is responsible for the transportation charges. Humboldt Mfg. Co.
