It seems too good to be true: a system that can find out if independent
load cells are functional or not. Even better,- a system that can automatically
adjust the calibration when a load cell or the weighing indicator has been
Most measuring and weighing systems, based on strain gage load
cells, consist of more than one sensor. These sensors are usually connected as
analogue by a junction box. Since the sensors are all connected in parallel,
the average measurement of the sensors is sent to the system. This way of
operation works fine, until a load cell breaks down. The challenge usually is
finding out which of the loadcells is defective. This is usually not
identified accurately and the system continues to operate with a
In order to overcome this drawback we developed an
"intelligent" load cell cable junction box, the SIGMA4. During a system test,
the junction box and the indicator measure the load cell output per sensor,
compares this against data specs and determines if it is within spec.
When a load cell is faulty, it can simply be switched off. Thus, the
measuring system can with some restrictions - temporarily operate with fewer
The advantage is an immediate recognition of which load cell
is faulty and what the deviation is.
Furthermore this module supports
TEDS (Transducer Electronic Data Sheet), meaning that individual sensor
information is available and can be compared. This facilitates automatic
re-justification. As an added extra the instrument stores all calibration
data, optionally in the PC program Pi.
The SIGMA4 is compatible with
the new PENKO weighing instruments. It is suitable for 1 to 4 load cells, with
or without sense. Special provisions are unnecessary, and the usual load cell
power supply is sufficient fort his connection box.
housing is made of stainless steel with protection class IP65. Excluding the
glands the size is 180 x 150 x 95 mm.
For ease the selection a
practical brochure is available.