Load Cell / SM35ARD Load-Displacement (Dynamometer) Sensor
Product Categories Load Cells
SM35ARD load displacement (dynamometer) sensor is designed for testing dynamometer of oilfield pumping wells. It integrates load and acceleration displacement measurement functions, and applies force sensitivity, acceleration displacement, RS485 communication, low-power single-chip microcomputer and other technologies. It is a new energy-saving digital product, has obtained many patents, and passed explosion-proof certification. Designed for industrial environment use, it has been applied in major oil fields such as Daqing, Shengli, North China, Xinjiang, etc., and has won unanimous praise from users for its high precision, good reliability, simple installation, and convenient maintenance.
Description
SM35ARD load displacement (dynamometer) sensor is designed for testing dynamometer of oilfield pumping wells. It integrates load and acceleration displacement measurement functions, and applies force sensitivity, acceleration displacement, RS485 communication, low-power single-chip microcomputer and other technologies. It is a new energy-saving digital product, has obtained many patents, and passed explosion-proof certification. Designed for industrial environment use, it has been applied in major oil fields such as Daqing, Shengli, North China, Xinjiang, etc., and has won unanimous praise from users for its high precision, good reliability, simple installation, and convenient maintenance.
Function
Table 1. SM35ARD load displacement (dynamometer) sensor features
| project | Function | advantage |
| Function | Power diagram collection | The power diagram is collected at regular intervals (settable); it meets the needs of collecting data at dense points and dense times of the power diagram. |
| powered by | External | Powered by field instruments or independent power supply. |
| communication | RS485 Communication | No need for pipe laying and wiring, saving construction cost; high reliability and strong anti-interference ability. |
| Power consumption | Low power design | Sleep/wake-up, event-triggered wake-up automatic switching. |
| Install | U-shaped opening design Anti-pin-drop safety design | Direct plug-in quick installation saves installation costs and improves maintenance efficiency. Disassembly and maintenance are convenient, without the need for a crane, etc. |
| seal | Fully sealed waterproof design | It can be used around the clock and is easy and safe to operate. |
| maintain | Remote battery voltage monitoring and fault detection, etc. | Remote diagnosis and maintenance in the control room eliminates the need to drive to the site, greatly saving maintenance costs. |
| Explosion-proof certification | Intrinsic Safety Certification | Certified by the “Petroleum and Chemical Industry Electrical Products Explosion-proof Quality Supervision and Inspection Center”. |
Main technical indicators
Table 2. Main technical specifications of SM35ARD load displacement (dynamometer) sensor
| project | Technical indicators | Indicator Features |
| Load | 0～150kN, accuracy: 0.5%FS. | Can be set to load output mode as needed |
| Vertical acceleration displacement | Stroke: 1~12m, accuracy: 2.0% FS; stroke frequency: minimum 1 time/min, accuracy: 1%. | |
| powered by | 24VDC | |
| Intensive collection | The power diagram points are ≥ 200, and the period is ≥ 10 minutes (settable). | It can meet the needs of collecting oil density points and time in the power diagram. |
| Protection level | IP67 | Dustproof, sandproof, waterproof, etc. |
| Work Environment | -40～+85℃ | Meet the requirements of high-cold and high-heat industrial environments. |
| Storage temperature | -55℃～+85℃ | |
| Working relative humidity | 5%～95% no condensation | |
| Communications | RS485 | Comply with A11-GRM communication protocol |
| Equipment calibration cycle | Recommended 6 months | |
| Explosion-proof certification parameters | Explosion-proof mark: Ex ib IIC T4 Gb | |
| U-shaped opening | Generally 40mm, customizable. | Can be customized according to the polished rod diameter. |
| Dimensions | Length 217 mm × width 100 mm × height 66 mm | |
| weight | 4.6kg. |
Appearance and structure
Instructions
1. Interchangeability
All load sensors are digitally calibrated, ensuring complete consistency and interchangeability between different load sensors.
2.LED indication
There is a dual-color (red and green) LED inside the antenna sheath. The specific definitions are shown in Table 3:
Table 3. SM35ARD Load Displacement Sensor LED Definitions
| Indicator Lights | Status Description | definition | Remark |
| Red LED (mode indication) | Changliang | Configuration Mode | Common parameters, instrument calibration, power diagram control parameters, and power diagram collection cycle. |
| Flashes multiple times with an interval of 1 second | Indicates that general data is being uploaded | The sensor sleeps and wakes up periodically, and the instrument actively sendsGeneral dataTo RTU. Load sensor general data includes: instantaneous load value, battery voltage, and communication efficiency. | |
| Green LED (power diagram measurement) | Changliang | Measuring power diagram | During this process, the red LED flashes every 1 second. |
| Flash | Power diagram measurement completed |
Install
Installed between the pumping unit suspension rope and the bare rod square clamp,The installation direction is based on the pressure head moving upward and the calibration interface moving downward, ensuring that the two protruding pressure heads of the sensor are facing upward and receiving force vertically.
The installation steps are as follows:
1. Stop the pump about 30cm from the bottom dead center (wellhead) and apply the brake.
2. Take the fixed square clamp and clamp the polished rod at the wellhead, release the brake, start the pumping unit to completely unload the rope hanger (that is, the rope hanger of the polished rod square clamp is disengaged), then stop the unit immediately and pull the brake again.
3. Loosen the nut of the load sensor anti-drop bolt and pull out the bolt.
4 Insert the load sensor U-port into the polished rod between the polished rod square card and the rope hanger or between the upper and lower plates of the rope hanger (Note:The installation direction is based on the pressure head downward, ensuring that the pressure head of the sensor is downward and vertically stressed), insert the anti-drop bolt into the U-shaped screw and seal it, and tighten the nut.
5. Straighten the suspension rope and load sensor, then release the brake. Release and brake immediately, and release immediately 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.
Precautions
1. During installation,The installation direction is based on the pressure head facing downwards, ensuring that the pressure head of the sensor faces downwards and is subjected to vertical force., do not turn it upside down!
2. If there are any problems with the product during use, please contact us in time. We provide 24-hour telephone support. It is strictly forbidden to open the product without permission, otherwise the warranty will be void.
3. This product is independently developed by our company, has independent intellectual property rights, and has obtained multiple patents. Any unit or individual is strictly prohibited from copying, imitating or counterfeiting without permission. Counterfeiting and infringement will be investigated.
4. For on-site debugging operations, etc., refer to the "SMTX-WU200-USB-F Wireless Digital Sensor Communication Terminal Software Operation Manual".
