Load Cell Junction Box

METTLER TOLEDO load cells and junction boxes enable the quick and safe integration for weighing into any machine for filling, dosing, batching, sorting by weight and check weighing. METTLER TOLEDO load cells are used in food, pharmaceutical and chemical applications.  They are available in various versions depending on the application and environment to meet requirements of OEM machine manufacturers, system integrators and end-users. A wide range of accessories are available for load cells including junction boxes, base plates and load introductions coping with shock and vibration.  

How do junction boxes affect the performance of a scale?
The 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 Precision Junction Boxes provide unique long term stability and easy installation features. Using precision discrete resistors with tight temperature specifications avoid the weaknesses of trim potentiometers like instable contacts over time. The precise resistors are operated by means of gold plated rotary dip switches for making adjustments easy. All Precision Junction Boxes support weightless calibration CalFree.

How can a junction box affect scale accuracy?
Junction boxes are often underestimated in terms of their accuracy impact. Precision junction boxes combine the best of two worlds. Discrete resistors provide high accuracy and long term stability while rotary switches combine them to a simple user interface similar to trim pots.

What material are junction boxes made of?
At METTLER TOLEDO, All junction boxes are made from stainless steel and provide best reliability even in harsh industrial environments. Version in IP65 and IP69K are available. All components for shift adjustment are on board, no soldering or additional resistors are needed. Rotary switches can be operated like trim pots without their trade-offs in terms of stability and temperature impact.

How does a load cell summing box work?
Load cell summing boxes connect numerous load cells to one signal which is then read by the terminal. These 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).