Load Cell / Load Cell SMA35GDDC-B
Product Categories Load Cells
The load sensor is specially designed for the suspension point load test of oilfield pumping units. It is constantly improved after use. It has a U-shaped plug-in structure and anti-drop bolt blockage, which is convenient and quick to install and disassemble. Standard signal output, good interchangeability. Two-wire system 4-20mA, power supply and signal transmission at the same time, wiring polarity self-adaptive; quick wiring terminal, convenient and quick on-site wiring, high cable reuse rate; fully sealed and waterproof design, meet all-weather use; supporting engineering installation accessories such as handle hooks and winding rings, protect cables and terminals, and ensure the construction quality of cable installation and wiring in the long-term operation of the pumping unit.
Description
The SMA35GDDC-B load sensor is specially designed for the suspension load test of oilfield pumping units. It has been continuously improved after use. It has a U-shaped plug-in structure and anti-drop bolt blockage, which is convenient and quick to install and disassemble. Standard signal output, good interchangeability. Two-wire system 4~20mA, power supply and signal transmission at the same time, wiring polarity adaptive; quick wiring terminal, convenient and quick on-site wiring, high cable reuse rate; fully sealed and waterproof design, meet all-weather use; supporting engineering installation accessories such as handle hooks and winding rings to protect cables and terminals, ensuring the construction quality of cable installation and wiring during long-term operation of the pumping unit.
Main technical indicators
Table 1. Main technical indicators of SMA35GDDC-B load sensor
| item Order | Technique Technique Ginseng number | one Bit |
| Output | 4-20 | mA |
| powered by | 15-30 (24 recommended) | VDC |
| Range | 0~150 | kN |
| Insulation resistance | ≥5000 | MΩ |
| Operating temperature | -40～+85 | ℃ |
| Accuracy | 0.5 | %F·S |
| Allow overload | 150 | %F·S |
| Protection level | IP67 |
Appearance and structure
Instructions
1. When determining the sensor specifications, it is recommended to select 80% according to the rated load.
2. When designing the loading device, ensure that the line of action of the loading force coincides with the force axis of the sensor to avoid measurement errors caused by lateral force.
3. Two-wire output, no distinction between positive and negative poles. After the sensor is connected to the power supply, it must be preheated and start working after the instrument is stable.
4. The sensor housing, protective screw cover and lead connector are all sealed. Please do not open them at will.
5. The sensor should be stored in a dry and corrosion-free environment. Avoid using it in an environment close to high non-working heat sources.
Install
The SMA35GDDC-B load sensor is inserted between the rope hanger and the square clamp on the polished rod, and the anti-drop bolt is locked. As shown in Figure 3, the installation steps are as follows:
1. Stop the pump about 30cm from the bottom dead center (wellhead) and apply the brake.
2. Fix the square clamp to fix the polished rod at the wellhead, release the brake, start the pumping unit until the rope hanger is unloaded (i.e. the square clamp of the polished rod is disengaged from the I-beam), then stop the unit immediately and pull the brake again.
3. The pressure head of the sensor (two protruding cylinders) is facing downward, and the U-mouth is inserted between the lower plate of the I-beam and the rope hanger.
4. Straighten the sensor, rope hanger, and I-beam frame. The upper and lower plates of the I-beam frame should be parallel and installed on the rope hanger. Note:
a. If the upper surface of the rope hanger is uneven, a pad can be added to ensure that the center line of the sensor pressure head is perpendicular to the light rod. b. Ensure that the sensor installation does not change the test structure of the I-beam frame (the test worker inserts the hydraulic sensor here, and the portable instrument is used for dynamometer).
5. Release the brake, brake immediately after release, and release immediately after brake, so as to control the suspension rope to rise slowly and load steadily.
6. Remove the fixed square card and polish the card mark on the smooth rod.
7. Installation of load cables: Choose materials that are resistant to high heat, high cold and folding, with an outer diameter of 1.5mm. The cable hoop is wound around the winding ring and tightened with a cable tie.
Lead:
- Lead out a 40cm long cable near the sensor, insert it into the waterproof connector, and then into the protective screw (twist it off in advance), and connect the cable end to the sensor's terminal.
- Tighten the protective screw onto the sensor and the waterproof connector;
- Pass the handle hook through the wire loop and hang it on the hanging ear;
- The other end of the load cable is usually tied to the operating platform at the top of the pumping unit support. The length of the cable from the sensor to the operating platform should be appropriate, generally when the lowest point of the cable suspension at the bottom dead center of the oil well is slightly lower than the sensor, and it should not be too loose or too short.
Sensor accessories
