SIEMIENS PFT6 series weighing sensor

SIEMIENS PFT6 series weighing sensor

Product core positioning

The PFT6 series is a strain gauge weighing sensor designed for harsh industrial environments. Its core advantages are high precision, high protection, and strong anti-interference ability. It is suitable for scenarios with strict requirements for weighing accuracy, such as batching systems and trade settlement belt scales. The range covers 10kg-5000kg and can meet the needs of industrial weighing from light to medium.

Product principle and core features

1. Measurement principle

Based on the effect of resistance strain gauges, the core structure consists of a metal elastomer and resistance strain gauges attached to the elastomer

When the sensor is subjected to a load, the metal elastomer undergoes slight deformation;

Strain gauges undergo resistance changes with the deformation of the elastic body (stretching → increasing resistance, compression → decreasing resistance);

Convert the resistance change into a voltage signal (rated output 2mV/V) through a Wheatstone bridge, and transmit it to the weighing instrument for data processing.

2. Core Features

High precision level: C3 level in accordance with OIML R60 standard (suitable for medium to high precision weighing, division value ≤ 3000), ensuring the accuracy of trade settlement and industrial batching;

High protection performance: The conventional model has a protection level of IP67 (dustproof, anti short-term immersion), and the special customized model can reach IP68 (no damage after soaking in 1m underwater for 24 hours), suitable for harsh industrial environments such as dust and humidity;

Wide temperature adaptability: Temperature compensation range of * * -10 ℃~+40 ℃ (ensuring stable accuracy within this range), working temperature range of -30 ℃~+60 ℃ * *, suitable for high and low temperature industrial scenarios;

Anti interference capability: The single ended grounding design of the cable shielding layer reduces electromagnetic interference (EMC) and is suitable for industrial strong electromagnetic environments;

Overload protection: Safe overload capacity of 150% rated load (R.C.), ultimate overload capacity of 300% R.C., to avoid permanent damage caused by accidental overload.

Key technical parameters

1. Range and accuracy parameters

Range (R.C.) Accuracy level Nonlinear (≤±% R.O.) Lag (≤±% R.O.) Repeatability (≤±% R.O.) Sensitivity Temperature drift (≤±% R.O./℃)

10kg-50kg OIML C3 0.02 0.02 0.01 0.0005

100kg-200kg OIML C3 0.02 0.02 0.01 0.0005

500kg-1000kg OIML C3 0.02 0.02 0.01 0.0005

2000kg-5000kg OIML C3 0.02 0.02 0.01 0.0005

Note: R.O. (Rated Output)=Rated Output, R.C. (Rated Capacity)=Rated Load

2. Electrical parameters

Parameter Category Specific Indicator Remarks

Rated output 2mV/V ± 0.1% based on 10V DC excitation voltage

The resistance between the excitation terminals of the input resistor 380 Ω± 20 Ω

The resistance between the output resistor 350 Ω± 5 Ω signal terminals

Insulation resistance ≥ 5000M Ω (50V DC) between the measuring end and the casing

Excitation voltage 5V DC-15V DC, recommended 10V DC, maximum not exceeding 15V DC

Maximum excitation current of 10mA to avoid excessive excitation current causing strain gauge heating

3. Environmental and mechanical parameters

Parameter category specific indicator standard basis

Working temperature range -30 ℃~+60 ℃ IEC 60068-2-1/2

Temperature compensation range -10 ℃~+40 ℃ OIML R60

Humidity adaptation ≤ 95% RH (non condensing) IEC 60068-2-3

Protection level IP67 (conventional), IP68 (customized) IEC 60529

Allowable lateral force ≤ 10% R.C. Siemens design specifications

Allowable torque ≤ 10% R.C. Siemens design specifications

Vibration tolerance 50Hz, 10m/s ² (10-2000Hz) IEC 60068-2-6

Impact withstand 100m/s ² (11ms) IEC 60068-2-27

Installation and connection specifications

1. Preparation before installation

Environmental inspection: Confirm that the installation environment temperature and humidity meet the parameter requirements, there are no corrosive gases or strong magnetic fields (if additional protection is required);

Load confirmation: Ensure that the actual weighing load is within the range of the sensor (avoid long-term close to 150% R.C. safe overload);

Tool preparation: Suitable torque wrench (ensure thread fixing torque compliance), level (calibrate installation plane), cleaning tool (clean installation surface impurities).

2. Mechanical installation requirements

Installation plane: The support surface should be flat (flatness error ≤ 0.1mm/m), sturdy, and avoid affecting measurement accuracy due to deformation of the support surface;

Alignment requirements:

When installed vertically, the load should be applied along the axis direction of the sensor, and tilting is prohibited (deviation ≤ 0.5 °);

When installing horizontally (such as a belt scale), the sensor needs to be accurately aligned with the weighing frame to avoid lateral forces;

Load limit: Strictly control lateral force and torque to ≤ 10% R.C., and install guiding devices (such as locating pins) if necessary;

Fixed specifications:

Range (R.C.) Fixed thread specification Recommended torque (Nm) Prohibited behavior

Excessive tightening of M6 8 from 10kg to 50kg (to avoid deformation of the elastic body)