Measurement electronics SIL1 | PL c

Measuring Electronics SIL1 | PL c — Protective function in the device

Here, the safety is integrated directly into the amplifier: a second amplifier, two comparators, and a semiconductor relay monitor the measuring bridge independently of the measuring channel. A safety control is not required for this — the device switches on its own. This is the difference compared to the SIL3 | PL e series, which requires a safety control.

And unlike the pure safety components of the SIL3 series, these devices remain functional measuring amplifiers: 0.1% of the measuring range plus sensor error, 24-bit resolution, output optionally 4 … 20 mA or 0 … 10 V.

The devices

• SMM-DR-SIL1 — DR22.5 DIN rail housing for the control cabinet.
• SMM-HD-SIL1 — the same electronics in an IP65 field housing for mounting outside the control cabinet.
• MEUTS-SIL — dual-channel transducer with built-in overload circuit, certified by TÜV Nord under number 44 799 14098202. The safety circuit has its own amplifier and is located parallel to the IO-Link transducer's measuring chain – the protective function is therefore not dependent on the measuring chain. The semiconductor relay opens when the switching point is exceeded, when the supply voltage of the measuring amplifier is too low or missing, in the event of a cable break in one or both signal lines, and when the supply to the safety circuit itself is too low or missing. The safe state is an open relay.

What's included

The matching sensors can be found under load cells & force transducers, the rest of the range under Measuring electronics. The architecture, key figures for system certification, and typical applications are explained on the page Functional Safety SIL | PL.