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Borehole diameter measurement range:
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(1) Ф500mm~Ф1200mm (JJY-2); If equipped with an extending leg of 200 mm, its measurement range can be extended to 1600 mm;
(2) Ф1000mm~Ф1800mm (JJY-5); If equipped with an extending leg of 770 mm, its measurement range can be extended to 2800 mm;
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Borehole diameter measurement error:
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(1) ±15 mm (JJY-2);
(2) ±25 mm (JJY-5);
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Current for caliper:
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10 mA
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Sensitivity of caliper:
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≥100mV/10cm (when current is at 10 mA)
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Cable length:
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100 m (maximum is 125 m)
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Tension of cable:
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0.35t (It will broken at 0.65 t)
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Drag thickness determination:
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(1) Distance interval between electrodes: 0.02m±0.5mm;
(2) Measurement error of electric resistance: ≤5%;
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Verticality determination:
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(1) Measurement range: 0~10°;
(2) Resolution: 0.05°;
(3) Measurement error: ≤±0.1%;
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Depth indication error:
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≤1‰
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Working temperature:
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(1) Measurement probes: 0~50℃;
(2) Controlling case: -10℃~45℃
(3) Relative humidity: <85%;
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Pressure endured by caliper:
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≥3Mpa
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Power supply:
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AC 220V, 50 Hz, 50 W
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