Siemens SIWAREX R Instrukcja obsługi - Strona 6

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Edition 06/2009

At least four WSGs per load cell are connected in a full Wheatstone bridge. The

stretched or upset WSGs are wired so that the positive or negative changes in

resistance add up to a total upset of the bridge.

The feed voltage (in 6-wire technology also the sensor voltage, SENSE) is applied

at one bridge diagonal. The measuring voltage is tapped at the other diagonal.

At a constant feed voltage (EXC), the measured voltage (SIG) changes

proportionally to the applied load (figure 1-2). In practice load cells contain other

resistors for temperature compensation, zero point and parameter adjustment.

These may be in the input or output of the load cell depending on the type and on

requirements.

Figure 1-2 Principle diagram of a Wheatstone bridge

The SIWAREX R load cells are usually made of high-grade steel and are welded

hermetically sealed. This provides high corrosion protection and protection rating.

Most series are licensed for use in scales with mandatory calibration of class III

according to DIN EN 45501 and comply with OIML R60 3000d. Load cells with

greater accuracy and/or EEx (i) approval are available on request.

SIWAREX R load cells are electrically calibrated as standard. As a result, no

reference load adjustment is necessary for example when commissioning a

platform scales. A load cell can also be exchanged without readjustment.

An exception to this rule is the series K and possibly load cells delivered outside

the standard scope of delivery. The respective technical data apply for these load

cell types.

SIWAREX R Load Cells Operating Manual

A5E00159640

Technical Description