B12A51 High-Sensitivity Seismic IEPE Accelerometer

B11A51

High-Sensitivity IEPE Accelerometer
Uniaxial
Sensitivity: 5000mV/g
Range: ±1.0g
Frequency (5%): 0.1-400Hz
Temp Range: -40~85°C
Connector: Top (MIL-C-5015)
Mount: 1/4-28 Female

Fast Lead Time

Datasheet (PDF): B11A51

SKU: B11A51 Categories: Accelerometers, High-Sensitivity, IEPE

IEPE Seismic-Grade Low-Noise Isolated Uniaxial Accelerometer · MIL-C-5015 · TEDS optional

Overview

The B11A51 is a low-noise, high-sensitivity, isolated uniaxial IEPE accelerometer built on a piezoelectric ceramic shear sensing element with a dedicated low-noise ASIC. With 5,000 mV/g (5 V/g) sensitivity and a ±1 g range it is the 5 V/g, ±1 g member of the seismic-grade A51 pair, with a 1 µg rms noise floor for the faintest low-frequency motion. Typical uses include seismic and micro-seismic monitoring, dam, tunnel and long-span bridge surveys, ground-borne vibration from traffic and construction and ultra-quiet laboratory and semiconductor sites.

High-grade piezoelectric ceramics deliver long-term output stability, and the low-noise ASIC gives spectral noise of 0.01 µg/√Hz at 100 Hz with 0.000001 g rms broadband resolution and a ≥ 10 s discharge time constant that holds the ±5% response from 0.1 Hz to 400 Hz. A double-shielded isolated construction (≥ 10⁸ Ω) rejects common-mode electrical interference on long cable runs, and the laser-welded ⌀57.2 × 71 mm stainless-steel housing is sealed to IP68 with a MIL-C-5015 2-pin connector and a 1/4-28 stud mount.

5 V/g

Sensitivity

±1 g

Measurement range

0.1 – 400 Hz

Frequency range (±5%)

0.01 µg/√Hz

Noise at 100 Hz

1,100 g

Weight

⌀57.2 × 71 mm

Stainless steel, IP68

Why engineers choose the B11A51

Ultra-low noise floor

5,000 mV/g sensitivity with spectral noise of 0.05 / 0.01 / 0.003 µg/√Hz at 10 / 100 / 1000 Hz and 0.000001 g rms broadband resolution, from a specially designed sensing element core that maximizes the sensitivity-to-noise ratio, so sub-micro-g motion is resolved cleanly above the noise.

Isolated, double shielded

Double-shielded construction isolates the signal ground from the housing (≥ 10⁸ Ω) and suppresses common-mode interference, so the tiny signals survive long cable runs through electrically noisy sites. Laser-welded ⌀57.2 × 71 mm stainless housing sealed to IP68, rated to 20 g rms and 100 g pk.

Low-frequency IEPE electronics

Dedicated low-noise ASIC with a ≥ 10 s discharge time constant gives a ±5% response from 0.1 Hz to 400 Hz and ±10% over 0.05 – 500 Hz, with resonance ≥ 1.2 kHz. Standard IEPE two-wire interface with 2–20 mA excitation and 8–12 V bias on an industry-standard MIL-C-5015 connector.

Typical applications

Bridge, building, dam and civil structural measurements
Seismic, micro-seismic and ground-borne vibration monitoring
Micro-vibration surveys of laboratories, cleanrooms and precision equipment
Foundation and floor vibration
Ambient and long-term structural monitoring
Any measurement requiring the lowest noise floor

What’s in the box

B11A51 isolated high-sensitivity accelerometer
Product calibration certificate

Options & accessories

TEDS (IEEE 1451.4) for plug-and-play sensor ID – order model 21151A
Recommended cable K12AH02 (MIL-C-5015 2-pin) – build yours in the Cable Builder
Handle with care: ±1 g range and 100 g pk shock limit – contact us for mounting and handling advice

Key specifications

Full specifications in the datasheet (PDF) →

Sensitivity

5,000 mV/g (500 mV/(m/s²))

Measurement range

±1 g

Broadband resolution

0.000001 g rms

Frequency range

0.1 – 400 Hz (±5%) · 0.05 – 500 Hz (±10%)

Resonance frequency

≥ 1.2 kHz

Discharge time constant

≥ 10 s

Transverse sensitivity

≤ 5%

Excitation

20 – 30 VDC, 2 – 20 mA

Output bias voltage

8 – 12 V

Electrical isolation

≥ 10⁸ Ω

Spectral noise (10 / 100 / 1000 Hz)

0.05 / 0.01 / 0.003 µg/√Hz

Vibration / shock limit

20 g rms · 100 g pk

Operating temperature

−40 to +85 °C

Connector / mounting

MIL-C-5015 2-pin · 1/4-28 × 5.6 thread

Size / weight / torque

⌀57.2 × 71 mm · 1,100 g · 3.5 N·m

Sensitivity measured at 160 Hz, 24 VDC, 4 mA. Typical values. Vibration and shock limits per JBT 6822-2018 7.12.1 and refer to the sensor surviving in a non-powered state.

Other models in the BXXA51 / A53 isolated high-sensitivity family

Same shear sensing element, dedicated low-noise ASIC, double-shielded isolated construction, MIL-C-5015 connector and 1/4-28 stud mount across the family. A51 models are the seismic-grade pair with the lowest noise floor; A53 models are the compact pair with bandwidth to 1 kHz. Choose the sensitivity, noise floor and bandwidth that fit your site.

Model	Sensitivity	Range	Frequency (±5%)	Noise @ 100 Hz	Size · weight
B11A51This model	5 V/g	±1 g	0.1 – 400 Hz	0.01 µg/√Hz	⌀57.2 × 71 mm · 1,100 g
B12A51	10 V/g	±0.5 g	0.1 – 400 Hz	0.01 µg/√Hz	⌀57.2 × 71 mm · 1,100 g
B11A53	5 V/g	±1 g	0.15 – 1k Hz	0.5 µg/√Hz	HEX 30.2 × 56.1 mm · 227 g
B12A53	10 V/g	±0.5 g	0.15 – 1k Hz	0.13 µg/√Hz	HEX 30.2 × 56.1 mm · 227 g

Downloads & next steps

Datasheet, installation guide, and a quote from our global support team.

B11A51 datasheet (PDF)Request a quote

Also available: Accelerometer operation & installation guide (PDF)

Sensitivity (mV/g)	5000
Range (g)	1
Broadband Resolution (g rms)	0.000001
Linearity	1%
Frequency Range [5%] (Hz)	0.1-400
Min Frequency [5%] (Hz)	0.1
Max Frequency [5%] (Hz)	400
Frequency Range [10%] (Hz)	0.05-500
Resonant Frequency (kHz)	≥1.2
Discharge Time Constant (s)	≥10
Transverse Sensitivity	≤5%
Excitation Voltage (Vdc)	20-30 Vdc
Constant Current Excitation (mA)	2-20 mA
Output Impedance (Ω)	≤100
Output Bias Voltage (V)	8-12 Vdc
Max Acceleration (g)	2
Max Shock (g)	10
Temperature Range (℃)	-40~85
Min Temperature (°C)	-40
Max Temperature (°C)	85
Sealing	Laser Welding IP68
Housing Material	Stainless Steel
Output Connector	MIL-C-5015
Mounting	1/4-28 Female
Weight (grams)	1100
Sensor Type	High-Sensitivity
Output Type	IEPE
Axis	Uniaxial
TEDS Optional	No

Datasheet (PDF): B11A51
Manual (PDF): Op. & Installation Guide
Popular Cables: K12AH02 (MIL-C-5015 2-pin)
TEDS Model: 21151A

B11A51

Overview