Banner SI-RF Non-Contact RF Safety Switch, Cat 4 PL e

The Banner SI-RF is a non-contact radio-frequency safety switch for monitoring the position of gates, doors, covers and guards on machine cells, conveyors and packaging lines. A coded actuator mounted on the guard is read by the sensor through an electronic field, so the switch has no moving parts and tolerates misalignment better than mechanical limit switches.

One SI-RF switch meets Category 4, PL e and SIL CL 3 on its own, and up to 32 switches can be wired in series. Seven Star LLC, an independent supplier in Muscat, quotes SI-RF sensors and actuators by exact model code from the Banner product manual.

Technical specifications

Reading the model table

The manual groups sensors by connection and diagnostics. SI-RFST and SI-RFSL are series PNP sensors with automatic or manual reset; SI-RFDT and SI-RFDL add In-Series Diagnostics; SI-RFPT models are single PNP sensors with 2 m cable or a 5-pin pigtail. The last letter before the connector code sets the coding level: L for low, H for high and U for unique. A basic system needs a sensor, an actuator (SI-RF-A or low-profile SI-RF-A2), a cable and a safety monitoring device.

Choosing the coding level

The manual offers low, high and unique coded sensors; choose the coding level that matches how strictly each sensor must be paired with its actuator, and confirm the details in the manual. The manual notes that the SI-RF is designed for non-locking guarding applications unless another means of locking is provided; for guard locking see the Banner SI-LS42 and SI-GL42 families. Series strings use the redundant inputs and outputs, and the last switch in the string ties its inputs to +24 V DC.

Installation and what to confirm

The sensing distances apply only with the SI-RF-A actuator and require non-flush mounting on metal; multiple units need at least 100 mm spacing, as the manual states. Mount the sensor and actuator with M4 hardware through the 4.5 mm holes and use permanent fasteners. Browse the safety switches and guard locking category for related devices. Please confirm before ordering: coding level, connector type, ISD need, reset mode, cable length and the safety controller or relay.

How the Banner SI-RF works

The sensor sends a low-power radio field and the coded actuator on the guard answers with its code. The sensor accepts the code only when the actuator is within range. When the guard opens, the actuator moves away and the safety outputs switch off. No contact is needed between the two parts.

Where the SI-RF is used

• Machine cell gates
• Access doors on conveyors
• Packaging line guards
• Covers and hatches
• Washdown areas

Selection checklist for the SI-RF

• Coding level, low, high or unique
• Series or single connection
• Diagnostic need
• Actuator style
• Connector type
• Cable length
• Reset mode
• Ambient temperature

Installation, commissioning and maintenance notes for the SI-RF

Mount the sensor and the actuator on the frame and the guard. Align them within the sensing distance. Connect the cable to the safety controller. Test that the outputs drop when the guard opens. Check the fixings at set intervals.

Requesting a quotation for the Banner SI-RF

Please send the model code, the coding level and the connector type. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

SI-RF switch design

The SI-RF is a non-contact radio-frequency safety switch.

SI-RF actuator

A separate coded actuator mounts on the guard.

SI-RF moving parts

The switch has no moving parts.

SI-RF coding levels

Coding levels are low, high and unique.

SI-RF actuator models

The actuators are SI-RF-A and the low-profile SI-RF-A2.

SI-RF series connection

Up to 32 sensors can be wired in series.

SI-RF sensing distance

The rated sensing distance is 13 mm.

SI-RF safety outputs

The safety outputs Q1 and Q2 are PNP, normally open, 100 mA.

SI-RF supply voltage

The supply is 24 V DC.

SI-RF diagnostics

In-Series Diagnostic models and sensor LED codes show the status.

SI-RF transponder frequency

The transponder frequency is 125 kHz.

SI-RF connections

The sensor has a pigtail with an M12 connector or a 2 m cable.

SI-RF enclosure

The housing is red PA66 plus PA6 with IP69 protection.

SI-RF temperature range

The ambient range is minus 25 to plus 70 degrees C.

Guard records for the SI-RF

Record the sensor model, the install date and each function test.

Choosing the right SI-RF coding

Choose the coding level from how easily the guard could be defeated.

Documents and quotation

The attached file is the unaltered official SI-RF Non-Contact RF Safety Switch Product Manual, p/n 208885 Rev. N, dated 5 June 2026. Seven Star LLC supplies the exact model code you specify and confirms availability and lead time in the quotation. Send the model code, quantity and delivery location to our team and we will respond with a price.