R. STAHL Switching Amplifier 9170/21-12-11S, 1-Channel, Relay Output, SIL 2, Ex ia IIC T6 160293

The R. STAHL 9170/21-12-11S switching amplifier stands out by providing intrinsic safety isolation for NAMUR sensors in hazardous areas, with a SIL 2 safety rating and a relay output capable of switching up to 250 V AC. This model is specifically designed for DIN rail mounting and offers galvanic isolation between input, output, and power supply.

Highlights

• 1-channel repeater power supply / switching amplifier for NAMUR proximity sensors or potential-free contacts
• Relay output: 1 change-over contact (SPDT), max. 250 V AC / 2 A / 500 VA, or 125 V DC / 2 A / 60 W
• Supply voltage: 24 V DC (19.2 - 30 V DC), power consumption max. 1.5 W
• Explosion protection: Intrinsic safety Ex ia, suitable for Ex ia IIC T6 Ga, Ex ia IIB T6 Ga, Ex ia IIIC T80°C Da
• Safety Integrity Level: SIL 2 according to IEC/EN 61508
• Mounting on DIN rail NS35/7.5 or NS35/15, pluggable screw terminals
• Operating temperature: -20 °C to +70 °C, degree of protection IP20

In daily use

This switching amplifier is ideal for signal conditioning in process automation, especially where sensors are located in hazardous areas. It provides a reliable relay output for alarms or control functions, with galvanic isolation to prevent interference and ensure safety. The pluggable terminals simplify installation and maintenance.

Full specifications

• Function: Repeater power supply / switching amplifier
• Number of channels: 1
• Input type: NAMUR proximity sensors / potential-free contacts
• Output type: Relay (change-over contact / SPDT)
• Output switching voltage AC: max. 250 V AC
• Output switching current AC: max. 2 A
• Output switching power AC: max. 500 VA
• Output switching voltage DC: max. 125 V DC
• Output switching current DC: max. 2 A
• Output switching power DC: max. 60 W
• Supply voltage: 24 V DC (19.2 - 30 V DC)
• Power consumption: max. 1.5 W
• Safety Integrity Level (SIL): SIL 2 (IEC/EN 61508)
• Explosion protection type: Intrinsic safety Ex ia
• Hazardous area classification: Ex ia IIC T6 Ga / Ex ia IIB T6 Ga / Ex ia IIIC T80°C Da
• Mounting type: DIN rail NS35/7.5 or NS35/15
• Operating temperature range: -20 °C to +70 °C
• Degree of protection: IP20
• Connection type: Pluggable screw terminals
• Galvanic isolation: Input to output, input to auxiliary power, auxiliary power to output

Final note

Engineered for demanding industrial environments, this amplifier ensures safe and reliable signal transmission from hazardous area sensors to control systems.