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Industrielle vægte og vejesystemer Vejemoduler, vejeceller, vejesensorer Junction Boxes

Junction Boxes

Quickly, Simply Connect Multiple Analog Load Cells to a Weighing Indicator

The junction box enables the quick and safe integration of multiple analog load cells into any machine for weighing. METTLER TOLEDO offers precision junction boxes for hazardous areas with ATEX and IECEx certification and for food and pharmaceutical applications where EHEDG design rules are followed and with GMP and NSF certification.

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Junction Box
Juntion Box Cable Connectors

Critical Considerations for Accuracy

The junction box is an analog component in an analog circuit where voltage changes of as little as 0.1 µV can be very significant. The accuracy and performance of analog scales can be undermined by poorly designed junction boxes, which can be sensitive to temperature changes, have poor long-term stability, and may be unable to correct corner-load errors. A modern junction box such as METTLER TOLEDO's precision junction box line is inherently robust to these effects while reducing installation time and improving ergonomics for maintenance teams.

Durable Construction for Continued Performance

Precision junction boxes combine IP67 or IP69K stainless-steel enclosures with electrical components that deliver high accuracy and stability. Housing material is available in either 304 (1.4301) or 316 (1.4401) stainless steel.

Junction Box Installed
Juntion Box Resistors and Switches

Discrete Resistors and Rotary Switches for Stability

In contrast to junction boxes that use trim-pots, precision discrete resistors provide much better immunity to the effects of temperature and humidity. Additionally, rotary switches select arrays of precision resistors for easy correction of corner errors, offering the same ease of use provided by trim-pots but without their inherent sensitivities. Scales equipped with precision junction boxes exhibit far superior long-term stability.

Documentation and Downloads

Precision Junction Boxes Downloads
Load Cell General Information

What is a load cell junction box?

A load cell junction box is an enclosure that is designed specifically for use with load cells, which are devices that are used to measure weight or force. The load cell junction box is typically used to connect multiple load cells together, in order to create a weighing system that is able to accurately measure the weight of an object. The load cell junction box contains electrical connections that are used to transmit signals from the load cells to a central computer or control system. These signals are then used to calculate the weight of the object being measured. The load cell junction box may also contain amplifiers or filters to ensure that the signal from the load cells is accurate and reliable.

How do load cell junction boxes affect the performance of a scale?

The load cell junction box is critical to the performance of weighing scales that use more than one analog load cell. It affects accuracy due to temperature effects, long-term stability, and corner-load adjustment. Mettler Toledo load cell junction boxes provide unique long-term stability and easy installation features which ensures a stable load cell junction box connection. Using precision discrete resistors with tight temperature specifications avoids the weaknesses of trim potentiometers like unstable contacts over time. The precise resistors are operated using gold-plated rotary dip switches to make adjustments easy. All METTLER TOLEDO load cell junction boxes function with weightless calibration, CalFree™.

How can a junction box affect scale accuracy?

Load cell junction boxes are often underestimated in terms of their accuracy impact. Load cell junction boxes combine the best of two worlds: discrete resistors provide high accuracy and long-term connection, while rotary switches join them to a simple user interface similar to trim pots.

What material are junction boxes made of?

Load cell junction boxes by load cell suppliers like METTLER TOLEDO are made of very rugged 316 stainless steel and FDA-certified stainless steel. The load cell junction box cable entry fitting is available with polyamide (Nylon), carbon steel (zinc plated), or stainless steel, which ensures that the load cell junction boxes are available to meet different budgets.

How does a load cell summing box work?

Load cell summing boxes or load cell junction boxes connect numerous load cells to one signal which is then read by the indicator. These load cell junction boxes are used in scales with more than one load cell. Actually, the name summing box is misleading. A more appropriate name would be an averaging box. These boxes do not add the single load cell to a sum but provide the average of all load cell signals (e.g. a box connected to 4x 50kg 2mV/V LC does not provide 8 mV/V at 200kg, but 2mV/V at 200kg).