Ultrahigh Precision LVDT
Gaging Probes
| Excitation Voltage | 3.0 Vrms (nominal) |
| Excitation Frequency | 5 kHz |
| Output Load | 100,000 Ohms (min.) |
| Operating Temperature | +15 °F to +175 °F |
| -10 °C to +80 °C | |
| Non-Linearity | < 0.5% of Reading |
| Repeatability Error | < 0.000006" |
| < 0.15 µm |
- Industrial gaging systems
- Electronic dial indicators
- Fabricated metal products gaging
- Materials testing apparatus
- Large shaft TIR measurements
- Ultra-precision linear ball bearing assembly gives 0.000006 inch (0.15 μm) repeatability
- Industry-standard .375" (9.5 mm) and
- Industry-standard sizes and ranges
- Exceptionally long life; 200 million cycles
- NIST-traceable calibration
- Low pressure air-extend/spring-retract versions available (BBP 375-A and BBT 375-A)
The Macro Sensors BBP and BBT family of pencil-type gaging probes offers ultra-precise measurement of dimensions in a wide variety of Q.C., SPC, and industrial metrology applications. They utilize a linear ball bearing assembly precisely fitted to a hardened-and-ground, non-rotating 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. For normal applications, the probe shaft is fully extended by a spring exerting a force of about 2.5 ounces (70 grams) at the probe's mechanical zero position. The entire bearing, shaft, and LVDT assembly are enclosed in a stainless steel tubular housing.
Macro Sensors also offers an air-extend/spring-retract version of the 3/8" diameter models. 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 front of all BBP/BBT gaging probes 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 space-critical 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.
- BBP 315 Series
- BBP/BBT 375 Series
- BBP/BBT 375-A Series
| Parameter | Unit of Measure | BBP 315-040 | BBP 315-100 | BBP 315-200 |
| Range | inches | ± 0.040 | ± 0.100 | ± 0.200 |
| mm | ± 1.0 | ± 2.5 | ± 5.0 | |
| Sensitivity | mV/V/.001 in | 5.3 | 3.8 | 2.7 |
| mV/V/mm | 210 | 150 | 105 | |
| Pretravel | inches | 0.006 | 0.006 | 0.006 |
| mm | 0.15 | 0.15 | 0.15 | |
| Overtravel | inches | 0.14 | 0.33 | 0.33 |
| mm | 0.35 | 0.85 | 0.85 | |
| Dimension "A" | inches | 1.89 | 2.68 | 3.58 |
| mm | 48.0 | 68.0 | 91.0 | |
| Dimension "B" (fully extended) | inches | 0.56 | 0.69 | 1.01 |
| mm | 14.15 | 17.65 | 25.65 |
BBP 315 Series gaging probes have an 8 mm diameter housing. Standard ranges normally in stock are shown in the specification table. On special order, BBP probes are available in shorter ranges of ±0.010 inches and ±0.020 inches, or in standard ranges configured for air-extend, spring retract operation in automatic gaging systems. Consult the factory for details on these units and other custom variations.
Macro Sensors uses gaging-industry-standard color coding and LVDT connections for the BBP cables, which are 6.5 feet (2 m) long and supplied with stripped-and-tinned ends. On special order and at extra cost, they can be supplied with one of several popular connectors wired to the cable end and with “standardized” sensitivities. Consult the factory for pricing and connector availability.
For BBP 315 Series, order by model number with range as shown in the table.
For accessories, please visit the Accessories Page.
Macro Sensors also offers a full line of LVDT signal conditioners, controllers and indicators that deliver optimum performance from any AC operated LVDT. For additional information, please visit the Electronics/Signal Conditioning Page.
| Parameter | Unit of Measure | BBP 375-040 BBT 375-040 |
BBP 375-100 BBT 375-100 |
BBP 375-200 BBT 375-200 |
| Range | inches | ± 0.040 | ± 0.100 | ± 0.200 |
| mm | ± 1.0 | ± 2.5 | ± 5.0 | |
| Sensitivity | mV/V/.001 in | 5.3 | 3.8 | 2.7 |
| mV/V/mm | 210 | 150 | 105 | |
| Pretravel | inches | 0.006 | 0.006 | 0.006 |
| mm | 0.15 | 0.15 | 0.15 | |
| Overtravel | inches | 0.14 | 0.33 | 0.33 |
| mm | 0.35 | 0.85 | 0.85 | |
| Dimension "A" | inches | 1.89 | 2.68 | 3.58 |
| mm | 48.0 | 68.0 | 91.0 | |
| Dimension "B" (fully extended) | inches | 0.56 | 0.69 | 1.01 |
| mm | 14.15 | 17.65 | 25.65 |
BBP 375 Series gaging probes have a 3/8 inch diameter housing. BBT 375 Series gaging probes have a 3/8 inch diameter housing that is partially threaded with an industry standard 3/8-40 UNS thread. Standard ranges normally in stock are shown in the specification table. On special order, BBP probes are available in shorter ranges of ±0.010 inches and ±0.020 inches, or in standard ranges configured for air-extend, spring retract operation in automatic gaging systems. Consult the factory for details on these units and other custom variations.
Macro Sensors uses gaging-industry-standard color coding and LVDT connections for the BBP and BBT cables, which are 6.5 feet (2 m) long and supplied with stripped-and-tinned ends. On special order and at extra cost, they can be supplied with one of several popular connectors wired to the cable end and with “standardized” sensitivities. Consult the factory for pricing and connector availability.
Specify BBP 375-(range) for 0.375 inch plain housing as shown in the table. For the 0.375 inch threaded housing, specify BBT 375-(range).
For accessories, please visit the Accessories Page.
Macro Sensors also offers a full line of LVDT signal conditioners, controllers and indicators that deliver optimum performance from any AC operated LVDT. For additional information, please visit the Electronics/Signal Conditioning Page.
| Parameter | Unit of Measure | BBP 375-040-A BBT 375-040-A |
BBP 375-100-A BBT 375-100-A |
BBP 375-200-A BBT 375-200-A |
| Range | inches | ± 0.040 | ± 0.100 | ± 0.200 |
| mm | ± 1.0 | ± 2.5 | ± 5.0 | |
| Sensitivity | mV/V/.001 in | 5.3 | 3.8 | 2.7 |
| mV/V/mm | 210 | 150 | 105 | |
| Pretravel | inches | 0.006 | 0.006 | 0.006 |
| mm | 0.15 | 0.15 | 0.15 | |
| Overtravel | inches | 0.14 | 0.33 | 0.33 |
| mm | 0.35 | 0.85 | 0.85 | |
| Dimension "A" | inches | 1.89 | 2.68 | 3.58 |
| mm | 48.0 | 68.0 | 91.0 | |
| Dimension "B" (retracted) | inches | 0.43 | 0.45 | 0.57 |
| mm | 11.05 | 11.55 | 14.55 | |
| Dimension "B" (fully extended) | inches | 0.56 | 0.69 | 1.01 |
| mm | 14.15 | 17.65 | 25.65 |
BBP 375 Series gaging probes have a 3/8 inch diameter housing. BBT 375 Series gaging probes have a 3/8 inch diameter housing that is partially threaded with an industry standard 3/8-40 UNS thread. Standard ranges normally in stock are shown in the specification table. Consult the factory for details on other custom variations.
Macro Sensors uses gaging-industry-standard color coding and LVDT connections for the BBP and BBT cables, which are 6.5 feet (2 m) long and supplied with stripped-and-tinned ends. On special order and at extra cost, they can be supplied with one of several popular connectors wired to the cable end and with “standardized” sensitivities. Consult the factory for pricing and connector availability.
Specify BBP 375-(range)-A for 0.375 inch plain housing as shown in the table. For the 0.375 inch threaded housing, specify BBT 375-(range)-A.
For accessories, please visit the Accessories Page.
Macro Sensors also offers a full line of LVDT signal conditioners, controllers and indicators that deliver optimum performance from any AC operated LVDT. For additional information, please visit the Electronics/Signal Conditioning Page.
