Made in Japan
Manufacturer: Kyowa Electronic Instruments Co., Ltd.
Model: BJ-50AT

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	50 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

Models	Rated Capacity (Displacement)	A (Approx.)	B (Approx.)	Bellows (Approx.)
BJ-5AT	5 mm	260	275	25
BJ-10AT	10 mm	260	275	50
BJ-20AT	20 mm	260	275	50
BJ-50AT	50 mm	270	285	100