Four-Arm Caliper HC-454
Four-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
Each arm measures independently.
| Diameter | 45 mm |
| Length | 150 cm |
| Weigh | 8.0 kg |
| Max. Working Temperature/Pressure | 75°C/10 MPa |
| Min. No. of Cable Conductors | 4 |
| Supply Voltage Range | 30 – 45 VDC |
| Max./Nominal Current Consumption | 100/60 mADC |
Measuring Parameters
| Measuring Range | 45 to 300 mm (short arms) |
| 100 to 700 mm (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 parameters are similar to those stated above.