Description
Strain gauge bridge amplifier SMM-DR-SIL1 with a built-in safety circuit for SIL1 and PL c — in a DR22.5 DIN rail housing for the control cabinet.
The safety function sits inside the device: a second amplifier, two comparators and a semiconductor relay watch the bridge independently of the measuring channel. No safety controller is required — that is the difference to the SIL3 range, which does require one.
A usable measuring amplifier at the same time: 0.1 % of range plus sensor error, 24 bit resolution, output either 4 … 20 mA or 0 … 10 V. The identical version in an IP65 field housing is the SMM-HD-SIL1.
Features of the SMM-DR-SIL1
✅Sensor input: 1 × strain gauge full bridge 350 Ω
✅Bridge sensitivity: up to 4 mV/V
✅Bridge supply: 1.25 … 3 VDC
✅Analog output: 4 … 20 mA or 0 … 10 V
✅Accuracy: 0.1 % of range plus sensor error
✅Resolution: 24 bit
✅Switching output: 30 VAC/VDC, 500 mA max.
✅Response time: 50 ms
✅Safety rating: SIL1 · PL c — built in, no safety controller required
✅Housing: DR22.5 for DIN rail
✅Protection: IP20
✅Order key: R A X X X - X X