SIEMIENS PFT6 series weighing sensor

100kg-200kg M8 12, use a hammer to strike the sensor (damaged strain gauge)

500kg-1000kg M12 18 sensor in direct rigid contact with load (without buffering)

2000kg-5000kg M16 20 adjust the load direction after installation (generate lateral force)

3. Electrical connection specifications

Wiring method: Adopting a 4-wire system (red: excitation+, black: excitation -, green: signal+, white: signal -), some models support a 6-wire system (including compensation lines to improve long-distance transmission accuracy);

Cable requirements:

Use shielded cables (recommended cross-sectional area 0.25mm ² -0.5mm ²), with a cable length of ≤ 30m (if exceeding, a 6-wire system or signal amplifier is required);

Single end grounding of cable shielding layer (only grounded at the weighing instrument end to avoid the formation of grounding circulation);

Joint protection: IP67 waterproof joint is used, and the sealing nut needs to be tightened tightly after connection to prevent liquid infiltration;

Insulation requirement: Before wiring, a multimeter should be used to check the insulation resistance of the sensor (≥ 5000M Ω) to avoid signal interference caused by poor insulation.

Calibration and maintenance process

1. Calibration specifications

Calibration standard: Must comply with OIML R60 C3 level requirements, with calibration equipment accuracy ≥ 1/3 C3 level (such as standard weights, SIWAREX calibration tools);

Calibration conditions:

After the installation of the sensor is completed, let it stand for 24 hours (to ensure the release of elastic stress);

The ambient temperature remains stable at * * -10 ℃~+40 ℃ * * (within the temperature compensation range);

No vibration or airflow interference;

Calibration steps:

No load calibration: Ensure that the sensor is unloaded, perform "zero calibration" through the weighing instrument, and clear zero drift;

Loading calibration: Load standard weights in the order of 25% R.C., 50% R.C., 75% R.C., and 100% R.C., and record the instrument display value;

Error correction: If the displayed value deviates from the standard weight by more than ± 0.02% R.O., adjust the sensitivity through instrument parameters and repeat loading until the error is compliant;

Calibration records: Save calibration data (date, equipment, personnel, error values), and calibration certificates must comply with NIST traceability requirements.

2. Daily maintenance

Cleaning requirements: Clean the sensor surface every 3 months (using a dry soft cloth and avoiding the use of corrosive cleaning agents) to prevent dust and liquid accumulation from affecting the protective performance;

Status check:

Monthly inspection of mechanical connections (whether threads are loose and joints are sealed);

Check electrical connections (insulation resistance, cable shielding layer grounding) every 6 months;

Calibration cycle: Under normal usage scenarios, calibration should be conducted every 12 months. If used for trade settlement or harsh environments (such as vibration and high temperature), it should be shortened to 6 months;

Fault handling: When weighing data drift and accuracy decrease are found, priority should be given to checking the installation status (whether there is lateral force or deformation of the support surface), and then recalibration should be carried out. If there are still abnormalities, Siemens maintenance should be contacted.

Safety and Compliance

1. Safety regulations

Overloading is prohibited (long-term load ≤ 100% R.C., short-term impact ≤ 150% R.C.);

Sensors are precision equipment and should not be disassembled, knocked or welded, as this may cause permanent damage;

Explosion proof scenarios require the use of ATEX certified models, and conventional models are prohibited from being used in explosion-proof areas (such as chemical workshops).

2. Compliance certification

Compliant with EN 61298-2 (Safety Requirements for Industrial Weighing Equipment) and IEC 61298-2 (International Standard);

Having CE certification (EU market access) and optional ATEX certification (for use in explosion-proof areas);

The weighing accuracy meets OIML R60 C3 level and can be used in trade settlement scenarios (with compliance instruments required).

Application scenarios and adaptive instruments

1. Typical application scenarios

Application type, specific scenario, recommended range, protection level requirements

Belt scale weighing industrial belt conveyor (such as coal and ore transportation) 500kg-5000kg IP67

Weighing of chemical raw material tanks and food ingredient hoppers 100kg-5000kg IP67/IP68 (wet)

Automatic packaging machine for packaging equipment (such as flour and feed packaging) 10kg-200kg IP67

Industrial batching system multi-component mixed batching (such as concrete, paint) 50kg-1000kg IP67

2. Adapt to Siemens instruments

SIWAREX M: Modular weighing instrument, compatible with single/multi-sensor systems, supports PROFIBUS communication;

SIWAREX FTC: Compact instrument suitable for weighing belt scales and material tanks, with automatic calibration function;

SIWAREX U: Universal instrument, supporting 4-20mA analog output, suitable for small and medium-sized weighing systems.