Three-Arm Caliper HC-380
Three-Arm Caliper is one of the basic probes used for finding up technical state of boreholes.
It is mainly used for:
- establishment of diameter changes along borehole profile
- borehole volume calculation
- identification of hard and soft formations
- location of cracks, fissures or casing defects
- correction of other wireline logs for borehole size effects
Probe Parameters
| Diameter | 38 mm |
| Length | 110 cm |
| Weigh | 6.0 kg |
| Max. Working Temperature/Pressure | 75°C/10 MPa |
| Min. No. of Cable Conductors | 2 |
| Supply Voltage Range | 30 – 45 VDC |
| Max./Nominal Current Consumption | 100/60 mADC |
| Supply Voltage Polarity | + on central cond. |
| − on probe casing |
Measuring Parameters
| Measuring Range | 38 to 300 mm (with short arms) |
| 100 to 700 mm (with long arms) | |
| Sensitivity | ±0,2 resp. 0,5 mm |
| Communication (negative pulse) | 0 – 10 000 cps |
Special orders
Calipers of different diameters and different arm lenghts can also be manufactured upon special order. Their measuring parameters are similar to those stated above.