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lvdt dimensional gaging probe

LVDT Dimensional Gaging Probes

BB Series General Specifications
Excitation Voltage 3.5 Vrms (nominal)
Excitation Frequency 7.5 kHz
Operating Temperature +15 °F to +150 °F
-10 °C to +65 °C
box
  • Industrial gaging systems
  • Electronic dial indicators
  • Fabricated metal products gaging
  • Materials testing apparatus
  • Large shaft TIR measurements
box title
  • Ultra-precision linear ball bearing assembly gives repeatability of less than 0.000006" (0.15 μm)
  • Industry-standard .315" (8.0 mm) and .375"
    (9.5 mm) diameters
  • Ranges from ±0.020” (±0.5 mm) to ±0.200”
    (±5.0 mm)
  • Available in full bridge or half bridge
  • Full bridge models available in low pressure air-extend/spring-retract pneumatic versions and “soft-touch” (low force) versions

Macro Sensors BB Series LVDT-Based Dimensional Gaging Probes provide ultra-precise measurement of the position of a targeted surface in a wide variety of quality control and industrial metrology applications, including online parts inspection, servo-loop positioning systems, and manufacturing process control. Complete systems for “go/no-go” inspection of complex mechanical parts can be constructed by mounting multiple gage heads in suitable fixturing along an assembly line.

The probes' exceptional repeatability is due, in part, to the use of 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. One end of the probe shaft is coupled to the core of a friction-free LVDT sensor, which produces an output voltage that 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. LVDT gaging probes also offer unusually long life of 2 x 108 cycles. A positive stop also prevents any mechanical damage to the probe from repeated overstroking. 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 probe 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 that exerts 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 that is available in either .315" (8.0 mm) or .375" (9.5 mm) outside diameter. Units with the .375" diameter housing can be partially threaded with an industry standard 3/8-40 UNS thread. BB Series probes are available in either full bridge or half bridge wiring configurations, and full bridge models are available in low pressure air-extend/spring-retract pneumatic versions and “soft-touch” (low force) versions.

  • Full Bridge
  • Half Bridge
  • Pneumatic
  • Soft-Touch
BB Series Full Bridge Specifications - (click tabs above for Specifications for BB Series Half Bridge, Pneumatic, and Soft-Touch Models)
Parameter Unit of Measure BBP-315-020
BBP-375-020
BBP-315-040
BBP-375-040
BBP-315-100
BBP-375-100
BBP-315-200
BBP-375-200
Range inches ± 0.020 ± 0.040 ± 0.100 ± 0.200
mm ± 0.5 ± 1.0 ± 2.5 ± 5.0
Sensitivity mV/V/.001 in 5.85 ± 1% 5.85 ± 1% 2.92 ± 1% 2.92 ± 1%
mV/V/mm 230 ± 1% 230 ± 1% 115 ± 1% 115 ± 1%
Repeatability µm < 0.15 < 0.15 < 0.20 < 0.40
Linearity µm < 3 (0.3%) < 5 (0.25%) < 25 (0.5%) < 50 (0.5%)
Maximum Current mA 9 9 9 9
Phase Shift degrees < 10° < 10° < 10° < 10°
Pretravel inches 0.024/0.028 0.044/0.048 0.104/0.106 0.204/0.205
mm 0.6/0.7 1.1/1.2 2.6/2.7 5.1/5.2
Overtravel inches ≥ 0.03 ≥ 0.06 ≥ 0.12 ≥ 0.20
mm ≥ 0.65 ≥ 1.5 ≥ 3.0 ≥ 5.1
Dimension "A" (at null) inches 1.425 2.338 3.203 4.506
mm 36.2 59.38 81.35 114.45
Dimension "B" (at null) inches 0.28 0.504 0.581 0.878
mm 7.1 12.8 14.75 22.3
Dimension "C" inches 1.037 1.703 2.482 3.488
mm 26.35 43.25 63.5 88.6
Dimension "D" (nominal) inches NA 0.866 0.866 0.866
mm NA 22.0 22.0 22.0
BB Series Full Bridge Mechanical Drawing and Wiring Diagram
gage head wiring
BB Series Full Bridge Configurations

BB Series Full Bridge models are available in four standard ranges: ±0.020"
(±0.5 mm), ±0.040" (±1.0 mm), ±0.100" (±2.5 mm) and ±0.200" (±5.0mm). The probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position and pre-travel with a small spanner wrench that is supplied. The front of the probe is attached to a rubber boot that covers the probe shaft and prevents contaminants from entering the bearing. Probe sealing meets the requirements of IEC IP-65. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Macro Sensors uses industry-standard color coding and LVDT connections for the probe 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. Consult the factory for pricing and connector availability. 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.

BB Series Full Bridge Ordering Information
lvdt gage probe ordering information
BB Series Half Bridge Specifications - (click tabs above for Specifications for BB Series Full Bridge, Pneumatic, and Soft-Touch Models)
Parameter Unit of Measure BBP-315-020-H
BBP-375-020-H
BBP-315-040-H
BBP-375-040-H
BBP-315-100-H
BBP-375-100-H
BBP-315-200-H
BBP-375-200-H
Range inches ± 0.020 ± 0.040 ± 0.100 ± 0.200
mm ± 0.5 ± 1.0 ± 2.5 ± 5.0
Sensitivity mV/V/.001 in 1.87 ± 1% 1.87 ± 1% 0.94 ± 1% 0.75 ± 1%
mV/V/mm 73.75 ± 1% 73.75 ± 1% 36.9 ± 1% 29.5 ± 1%
Repeatability µm < 0.15 < 0.15 < 0.20 < 0.40
Linearity µm < 3 (0.3%) < 5 (0.25%) < 25 (0.5%) < 50 (0.5%)
Maximum Current mA 5 5 5 5
Phase Shift degrees < 5° < 5° < 5° < 5°
Pretravel inches 0.024/0.028 0.044/0.048 0.104/0.106 0.204/0.205
mm 0.6/0.7 1.1/1.2 2.6/2.7 5.1/5.2
Overtravel inches ≥ 0.03 ≥ 0.06 ≥ 0.12 ≥ 0.20
mm ≥ 0.65 ≥ 1.5 ≥ 3.0 ≥ 5.1
Dimension "A" inches 1.425 2.338 3.203 4.506
mm 36.2 59.38 81.35 114.45
Dimension "B" (at null) inches 0.28 0.504 0.581 0.878
mm 7.1 12.8 14.75 22.3
Dimension "C" (at null) inches 1.037 1.703 2.482 3.488
mm 26.35 45.25 63.05 88.6
Dimension "D" (nominal) inches NA 0.866 0.866 0.866
mm NA 22.0 22.0 22.0
BB Series Half Bridge Mechanical Drawing and Wiring Diagram
dimensional gaging probe half bridge wiring
BB Series Half Bridge Configurations

BB Series Half Bridge models are available in four standard ranges: ±0.020" (±0.5 mm), ±0.040" (±1.0 mm), ±0.100" (±2.5 mm) and ±0.200" (±5.0mm). The probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position and pre-travel with a small spanner wrench that is supplied. The front of the probe is attached to a rubber boot that covers the probe shaft and prevents contaminants from entering the bearing. Probe sealing meets the requirements of IEC IP-65. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Macro Sensors uses industry-standard color coding and LVDT connections for the probe 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. Consult the factory for pricing and connector availability. 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.

BB Series Half Bridge Ordering Information
lvdt dimensional gaging probe ordering information
BB Series Pneumatic Specifications - (click tabs above for Specifications for BB Series Full Bridge, Half Bridge, and Soft-Touch Models)
Parameter Unit of Measure BBP-315-040-P
BBP-375-040-P
BBP-315-100-P
BBP-375-100-P
BBP-315-200-P
BBP-375-200-P
Range inches ± 0.040 ± 0.100 ± 0.200
mm ± 1.0 ± 2.5 ± 5.0
Sensitivity mV/V/.001 in 5.85 ± 1% 2.92 ± 1% 2.92 ± 1%
mV/V/mm 230 ± 1% 115 ± 1% 115 ± 1%
Repeatability µm < 0.15 < 0.20 < 0.40
Linearity µm < 5 (0.25%) < 25 (0.5%) < 50 (0.5%)
Maximum Current mA 9 9 9
Phase Shift degrees < 10° < 10° < 10°
Pretravel inches 0.044/0.048 0.104/0.106 0.204/0.205
mm 1.1/1.2 2.6/2.7 5.1/5.2
Overtravel inches ≥ 0.06 ≥ 0.12 ≥ 0.20
mm ≥ 1.5 ≥ 3.0 ≥ 5.1
Dimension "A" inches 2.340 3.205 4.508
mm 59.4 81.4 114.5
Dimension "B" (fully extended) inches 0.555 0.642 0.940
mm 14.1 16.3 23.8
Dimension "C" inches 1.785 2.563 3.568
mm 45.3 65.1 90.7
Dimension "D" inches 0.865 0.865 0.865
mm 22.0 22.0 22.0
Dimension "E" inches 0.287 0.287 0.287
mm 7.3 7.3 7.3
Dimension "F" inches 0.598 0.598 0.598
mm 15.2 15.2 15.2
BB Series Pneumatic Mechanical Drawing and Wiring Diagram
lvdt dimensional gaging probe pneumatic series drawing and wiring
BB Series Pneumatic Configurations

BB Series Pneumatic models are air-extend/spring-retract versions of the full bridge model and are available in three standard ranges: ±0.040" (±1.0 mm), ±0.100" (±2.5 mm) and ±0.200" (±5.0mm). 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 that will accept a 1/8 inch I.D. hose. With the release of pressure, an internal spring returns the probe to its normal position.

The probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position and pre-travel with a small spanner wrench that is supplied. The front of the probe is attached to a rubber boot that covers the probe shaft and prevents contaminants from entering the bearing. Probe sealing meets the requirements of IEC IP-65. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Macro Sensors uses industry-standard color coding and LVDT connections for the probe 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. Consult the factory for pricing and connector availability.

BB Series Pneumatic Ordering Information
pneumatic lvdt gaging probe ordering information
BB Series Soft Touch Specifications - (click tabs above for Specifications for BB Series Full Bridge, Half Bridge, and Pneumatic Models)
Parameter Unit of Measure BBP-315-020-S
BBP-375-020-S
BBP-315-040-S
BBP-375-040-S
BBP-315-100-S
BBP-375-100-S
BBP-315-200-S
BBP-375-200-S
Range inches ± 0.020 ± 0.040 ± 0.100 ± 0.200
mm ± 0.5 ± 1.0 ± 2.5 ± 5.0
Sensitivity mV/V/.001 in 1.87 ± 1% 1.87 ± 1% 0.94 ± 1% 0.75 ± 1%
mV/V/mm 73.75 ± 1% 73.75 ± 1% 36.9 ± 1% 29.5 ± 1%
Repeatability µm < 0.15 < 0.15 < 0.20 < 0.40
Linearity µm < 3 (0.3%) < 5 (0.25%) < 25 (0.5%) < 50 (0.5%)
Maximum Current mA 9 9 9 9
Phase Shift degrees < 10° < 10° < 10° < 10°
Pretravel inches 0.024/0.028 0.044/0.048 0.104/0.106 0.204/0.205
mm 0.6/0.7 1.1/1.2 2.6/2.7 5.1/5.2
Overtravel inches ≥ 0.03 ≥ 0.06 ≥ 0.12 ≥ 0.20
mm ≥ 0.65 ≥ 1.5 ≥ 3.0 ≥ 5.1
Dimension "A" inches 1.563 2.476 3.203 4.644
mm 39.7 62.90 81.4 117.95
Dimension "B" (at null) inches 0.335 0.421 1.034 0.803
mm 8.5 10.70 26.3 20.40
Dimension "C" (at null) inches 1.038 1.703 2.169 3.409
mm 26.35 43.25 55.1 86.60
Dimension "D" (nominal) inches NA 0.866 0.866 0.866
mm NA 22.0 22.0 22.0
BB Series Soft-Touch Mechanical Drawing and Wiring Diagram
BB Series Soft-Touch Configurations

BB Series Soft-Touch models have a “lighter” spring (smaller spring constant) and no rubber boot. This allows for easier (low-force) compression of the probe, which is important in applications where the targeted surface material (rubber for example) may deform under the force of an LVDT with the standard spring. Soft-Touch versions of the full bridge model and are available in four standard ranges: ±0.020" (±0.5 mm), ±0.040" (±1.0 mm), ±0.100" (±2.5 mm) and ±0.200" (±5.0mm).

The probes’ mechanical design permits the user to make fine adjustments to the probe shaft’s contact position and pre-travel with a small spanner wrench that is supplied. From the rear end of the probe, a polyurethane - jacketed cable connects the LVDT's output to the signal conditioner. Macro Sensors uses industry-standard color coding and LVDT connections for the probe 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. Consult the factory for pricing and connector availability. 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.

BB Series Soft-Touch Ordering Information
soft touch lvdt gaging probe ordering information
tab bottom left
tab bottom right

For accessories, please visit the Accessories Page.

lvdt accessories

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.

lvdt signal conditioning

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