설명
Model F4822 Load cell For mobile elevating work platforms
Fatigue-proof measuring body
The model F4822 load cell for mobile elevating work platforms (MEWP) is designed for static and dynamic measuring requirements in both tension and compression force direction.
It is made from coated aluminium, which has particularly suitable properties for overload protection in mobile elevating work platforms.
Diverse redundant electronics
Due two redundant, opposing channels, the model F4822 ensures precise and reliable load monitoring of the cages of mobile elevating work platforms.
Special protective circuit for high EMC (electromagnetic compatibility)
Through a special protective circuit, harmful high electrical voltages, which can occur in electromagnetic instruments through self-induction, are limited and the voltage rise rate
is reduced. This contributes to the increase of reliability, service life and immunity – EMC – and reduction of emitted interference. Its safe operation is crucial for the safety of personnel and machinery.
The model F4822 load cell enables carefree use of mobile elevating work platforms in the industry, logistics sector, facility cleaning and maintenance in public spaces as well as for energy utilities and buildings in indoor and outdoor areas.
The measured force is output as a diverse redundant opposing electrical output signal (4 … 20 mA/20 … 4 mA, 3-wire) to reduce possible sources of errors to an absolute minimum.
Depending on the application, corresponding technical and regional approvals are available.
Technical data
| Basic information / Version per standard | |
| Standard | In accordance with directive VDI/VDE/DKD 2638 |
| Material of the measuring body | Aluminium |
| Ingress protection (per IEC/EN 60529) | IP67 and IP69K |
| Screw quality | 10.9 / M16 x 1.5 galvanized or chromated |
| Weight | Approx. 4 kg [8.82 lb] |
| Measuring element / Measurement principle / Sensor element | |
| Type of measuring element | Measuring spring (aluminium) with strain gauges |
| Force introduction | Compression force |
| Accuracy specifications / Repeatability | |
| Relative linearity error dlin | ≤ 0.5 % Fnom |
| Influence of torque on the measuring signal | ≤ 10 % Fnom |
| Temperature effect on zero signal TC0 | ≤ ± 0.2 % Fnom/10 K |
| Temperature effect on characteristic value TCC | ≤ ± 0.2 % Fnom/10 K |
| Reference conditions | |
| Load | ■ ≤ (UB – 10 V) / 0.02 A (channel 1) ■ ≤ (UB – 7 V) / 0.02 A (channel 2) |
| Rated load Fnom | |
| kg | lb |
| 2,000 | 4,409 |
| Further information to rated load Fnom | |
| Force limit FL | → See chapter „Work load limit (WLL)“ |
| Breaking force FB | → See chapter „Work load limit (WLL)“ |
| Output signal | |
| Rated characteristic value Cnom | 4 … 20 mA /20 … 4 mA, 3-wire, diverse redundant opposing |
| Auxiliary power | |
| Supply voltage UB | DC 9 … 32 V |
| Current/power consumption | Voltage output: < 8 mA per channel |
| Time response/Dynamic behaviour | |
| Response time | < 2 ms (within 10 % … 90 % Fnom) → Further response times on request |
| Voltage supply and performance data | |
| Electrical safety | Reverse polarity and surge protection and short-circuit resistance |
| Electrical connection | |
| Connection type | Cable outlet, flying leads |
| Cable diameter | 6.6 mm [0.260 in] |
| Cable length | 3 m [9.84 ft] |
| Insulation resistance Ris | > 2 GΩ / 100 V |
| Material | PUR |
Pin assignment
Electrical connection: cable outlet, flying lead
Output signal: 4 … 20 mA/20 … 4 mA, 3-wire, diverse redundant opposing
| Signal | channel | Cable colour | |
| UB+ (CH1) | Sensor voltage supply (+) | 1 | Brown |
| UB+ (CH2) | Sensor voltage supply (+) | 2 | White |
| 0 V/S– (CH1) | 0-V-potential/output signal (-) | 1 | Green |
| 0 V/S– (CH2) | 0-V-potential/output signal (-) | 2 | Grey |
| S+ (CH1) | Output signal (+) | 1 | Yellow |
| S+ (CH2) | Output signal (+) | 2 | Pink |
| Shield | Grounding | – | Green-yellow |
| Operating conditions | |
| Rated temperature range BT, nom | -20 … +80 °C [-4 … +176 °F] |
| Operating temperature range BT, G | -40 … +80 °C [-40 … +176 °F] |
| Storage temperature range BT, S | -40 … +85 °C [-40 … +185 °F] |
| Humidity | 35 … 85 % relative humidity (non-condensing) |
| Vibration resistance Frb (per DIN 50100) | 50 % Fnom |
| Operating altitude | Up to 2,500 m [6,562 ft] above sea level |
| Pollution degree in accordance with UL certification | Degree 4: “Electrical equipment for outdoor use” |
| Packaging and instrument labelling | |
| Packaging | ■ Individual packaging ■ Multiple packaging (up to 20 pieces possible) |
| Instrument labelling (product label) | ■ WIKA product label, glued ■ Customer-specific product label on request |
Work load limit (WLL)
The instrument‘s permissible working load was determined based on the safety against breaking load. A factor of 2 was assumed for this, meaning that the equivalent stress in the critical cross-section is at most half the tensile strength of the material.
This results in the WLL as follows:
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