The Piab LKVER electronic trasmitter measures the tractive force in a running line.

The LKVER trasnmitter together with the Piab Electronic Unit 8:300 series, is an effective overload guard and load indicator for cranes without a stationary line part. The transducers are measured for line loads up to 12000 kgf and for a max. 29 mm line diameter.

Both analogue and digital instruments can be easily connected for load indication on the 4-20mA signal transmission.

Piab LKVER is attached to a running line. The rope is deflected through a slight angle between three wheels and when loaded the force on the middle wheel is transmitted to the load cell via the pull rod.

The load cell is fed with a stablized voltage from the transducer amplifier which is mounted on the transmitter. A voltage proportional to the load is then fed from the load cell. The transducer amplifier amplifies and converts this voltage to a current signal, 4-20mA, 4mA when unloaded and 20mA at the max. capacity.

The signal is resistant to interference and tolerates serial resistances up to 250 ohm. The cable length can, therefore, be altered without special requirements for jointing or cable lengths. The unshielded cable (3 x 1.5 mm² + protective earth) carries the supply voltage to the transducer amplifier and load cell as well as the measuring signal to the electronic unit. The cable can be routed close to other live cables without affecting the measuring signal.

The signal tolerates a distance of up to 500 m between the LKVER and the electronic unit.

The Piab 8:300 series electronic unit feeds the LKVER transducer amplifier with supply voltage and conditions the transducer signal for the functions required.

In order to obtain highest accuracy and to minimize wear on the rope and the rope wheels, the wheels are induction hardened, have large diameter and are well designed in all respects. The wheels are available in several sizes to suit the rope diameter.

The Piab LKVER is zinc coated and yellow chromated. Plates and wheels are also polyester lacquered and the wheels have sealed for life ball bearings.

The load cell and amplifier are hermetically sealed and conform to the International Protection Specification, class IP 67 according to IEC 529.

The LKVER is designed so that it can be attached without affecting or reducing the capacity of the crane or the lifting equipment, the operating range or the construction.

The Piab LKVER is protected against faulty operation and indicates an "overload" for all combinations of cable breakdowns and/or short circuits that can arise due to cable damage.

The Piab LKVER can be overloaded mechanically by 100% nominal load without affecting the accuracy of measurement.

The construction of the suspension attachment makes it possible for the LKVER to move with line position for complete flexibility. The travelling rail tolerates a movement of ca 460 mm laterally.

The Piab LKVER can also be easily attached when there is no free end of the line.

The repeatability and linearity of the load cell are better than 0.2%. The system accuracy may, however, be significantly influenced by particular rope characteristics, pulley frictions and the reeving of the line, but is normally better than ±5%.

-20°C to +70°C

The load cell is temperature compensated with regard to both span and zero-offset.

Supply voltage: 20-30VDC

Power Consumption: 60 mA

Measuring Signal: Definitive current signal, 4-20 mA