Made in Japan
Manufacturer: Kyowa Electronic Instruments Co., Ltd.
Model: BJ-20AT

The BJ-AT is a joint transducer suitable for checking an opening of concrete blocks at the joint.

Features

• Suitable for checking an opening of concrete blocks at the joint or cracks initiated mainly by temperature change
• Also as an ordinary displacement transducer
• For embedment in concrete, the dedicated receptacle CJS-1C is embedded in advance in a preceding block and the joint transducer is
in stalled to the next block.

Specifications

Performance

Displacement Measurement

Rated Capacity	20 mm
Nonlinearity	Within ±1.5% RO
Hysteresis	Within ±1.5% RO
Rated Output	1 mV/V or more, tension: + output

Temperature Measurement

Rated Capacity	-30 to 70ºC
Measurement Error	±0.5ºC (-30 to 70ºC) (When measuring temperatures by using Kyowa’s civil engineering transducers with a thermal sensor.)

Environmental Characteristics

Safe Temperature	-30 to 80ºC
Compensated Temperature	-20 to 70ºC
Temperature Effect on Zero	Within ±0.05% RO/ºC
Temperature Effect on Output	Within ±0.05%/ºC

Electrical Characteristics

Safe Excitation	10 V AC or DC
Recommended Excitation	2 to 10 V AC or DC
Input Resistance	350 Ω ±1% at 0ºC
Output Resistance	450 Ω ±0.8% at 0ºC
Cable	4-conductor (0.5 mm2) chloroprene cable, 11.5 mm diameter by 1 m long, bared at the tip

Mechanical Properties

Safe Overloads	120%
Weight	Approx. 790 g (Excluding cable)

Dimensions