Macro Sensors LVDTs: BBP/BBT 375-A Series Ultra High Precision LVDT Gaging Probes

Description

The Macro Sensors BBP 375-A and BBT 375-A family of 3/8 inch diameter, air-extend/springretract, pencil-type gaging probes offers ultraprecise position measurement in a wide variety of Q.C., SPC, metrology, and industrial gaging applications where it is necessary or desirable to move the probe out of the way between readings. They utilize a linear ball bearing assembly precisely fitted to a hardened-and-ground, nonrotating probe shaft to minimize radial play and the effects of side loading. This results in the probes' exceptional repeatability of 0.000006 inch (0.15 µm).

One end of the probe shaft is coupled to the core of a friction-free LVDT sensor, which produces an output voltage is linearly proportional to the probe shaft position. The use of an LVDT for probe shaft displacement sensing eliminates any additional transducer errors due to friction, stiction, or mechanical hysteresis. The output from the LVDT can be connected to any standard LVDT signal conditioner and then passed to a gaging column display, digital readout, or computer based data acquisition system.

The other end of the shaft is internally threaded to accept an interchangeable tungsten carbide contact tip for wear resistance and reliability. During measurement cycles, the shaft is extended by introduction of a low-pressure (10-30 psi), clean, dry air supply, with a regulated flow, through a barbed fitting on the end of the unit for 1/8 inch I.D. hose. With the release of pressure, an internal spring returns the probe to its normal position. The entire bearing, shaft, and LVDT assembly are enclosed in a 3/8 inch diameter stainless steel tubular housing.

The front of a BBP/BBT gaging probe is attached to a rubber bellows that also covers the probe shaft, thereby preventing contaminants from entering the bearing. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Each probe is supplied with a replaceable end piece that converts the axial cable exit to a radial cable exit to minimize overall installed length in spacecritical applications. Probe sealing meets the requirements of IEC IP-65.

For setting up a probe in a fixture, the BBP/BBT gaging probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position with a small spanner wrench that is supplied. A positive stop prevents mechanical damage to the probe from repeated overstroking. For additional information and important installation considerations, we strongly urge you to visit www.macrosensors.com/lvdt_macro_sensors/lvdt_products/air_extend


click the image for an enlarged view General Specifications Unit Specifications Mechanical Drawing & Wiring Diagram Compatibility Configurations Ordering Information Tech Bulletin	Description The Macro Sensors BBP 375-A and BBT 375-A family of 3/8 inch diameter, air-extend/springretract, pencil-type gaging probes offers ultraprecise position measurement in a wide variety of Q.C., SPC, metrology, and industrial gaging applications where it is necessary or desirable to move the probe out of the way between readings. They utilize a linear ball bearing assembly precisely fitted to a hardened-and-ground, nonrotating probe shaft to minimize radial play and the effects of side loading. This results in the probes' exceptional repeatability of 0.000006 inch (0.15 µm). One end of the probe shaft is coupled to the core of a friction-free LVDT sensor, which produces an output voltage is linearly proportional to the probe shaft position. The use of an LVDT for probe shaft displacement sensing eliminates any additional transducer errors due to friction, stiction, or mechanical hysteresis. The output from the LVDT can be connected to any standard LVDT signal conditioner and then passed to a gaging column display, digital readout, or computer based data acquisition system. The other end of the shaft is internally threaded to accept an interchangeable tungsten carbide contact tip for wear resistance and reliability. During measurement cycles, the shaft is extended by introduction of a low-pressure (10-30 psi), clean, dry air supply, with a regulated flow, through a barbed fitting on the end of the unit for 1/8 inch I.D. hose. With the release of pressure, an internal spring returns the probe to its normal position. The entire bearing, shaft, and LVDT assembly are enclosed in a 3/8 inch diameter stainless steel tubular housing. The front of a BBP/BBT gaging probe is attached to a rubber bellows that also covers the probe shaft, thereby preventing contaminants from entering the bearing. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Each probe is supplied with a replaceable end piece that converts the axial cable exit to a radial cable exit to minimize overall installed length in spacecritical applications. Probe sealing meets the requirements of IEC IP-65. For setting up a probe in a fixture, the BBP/BBT gaging probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position with a small spanner wrench that is supplied. A positive stop prevents mechanical damage to the probe from repeated overstroking. For additional information and important installation considerations, we strongly urge you to visit www.macrosensors.com/lvdt_macro_sensors/lvdt_products/air_extend	Features Low pressure air-extend / spring-retract plunger Ultra-precision linear ball bearing assembly gives 0.000006 inch (0.15 µm) repeatability Industry-standard sizes and ranges Exceptionally long life; 200 million cycles NlST-traceable calibration Applications Cycled measurement functions Point-of-production Q.C. Automated data collection for SPC On-line inspection of parts Manufacturing process control