Pore Pressure Transducers

BPB-A/BPB-A-T

Embedded in a boring or together with a pile or steel sheet pile. These transducers measure pore water pressure Recommendable Excitation Voltage.

• Small-sized design, 30 mm in outer diameter, enables installation in borings of small diameters.
  • Flat filter (10μm mesh standard) is provided to prevent the sensing part from clogging.
  • Stainless steel case (including flat filter FB-10SUS)

Embedded in a boring or together with a pile or steel sheet pile, BPB-A/BPB-A-T series transducers measure pore water pressures or pore pressures. If desired, they can be used as pressure-based underground water level transducers by installing in a well. Recommendable Excitation Voltage. The BPB-A-T series is provided with temperature measuring function for simultaneous measurement of pore pressure and temperature. The cable length may be changed as specified.

Specifications

Performance

Pore Pressure Measurement

Rated Capacity : See table below

Nonlinearity :     Within±2% RO (BPB-A-200KP)

Within ±1% RO (BPB-A-500KP to 2MP)

Hysteresis :        Within ±1% RO

Rated Output : 0.75 mV/V (1500μm/m) or more (BPB-A-200KP)

1 mV/V (2000μm/m) or more (BPB-A-500KP to 2MP)

Temperature Measurement (BPB-A-T)

Rated Capacity : -30 to 70°C

Measurement Error : ±0.5°C (-30 to 70°C)

(Refer to Small-Sized Temperature Transducer BTS-100AT, page 7-30.)

Environmental Characteristics

Safe Temperature Range : 0 to 80°C (BPB-A) (non-freezing)

-30 to 80°C (BPB-A-T) (non-freezing)

Compensated Temperature Range : 0 to 60°C (non-freezing)

Temperature Effect on Zero Balance : Within ±0.1% RO/°C

Temperature Effect on Output :         Within ±0.1%/°C

Electrical Characteristics

Recommendable Excitation Voltage : 2 to 10 V AC or DC

Input Resistance :      350Ω±1% (BPB-A-T at 0°C)

Output Resistance : 350Ω±1%

(450Ω±0.8% at 0°C with BPB-A-T)

Cable : 4-conductor (0.5 mm2) chloroprene shielded cable,

11.5 mm diameter by 1 m long, bared at the tip

 Mechanical Properties

Safe Overload Rating : 150%

Weight :                    Approx. 320 g

※Double shielded cable can also be manufactured.

Dimensions