Question 1

What is the Siemens QRB 4A photo cell used for?

Accepted Answer

The Siemens QRB 4A is a flame-sensing photo cell used in burner control systems to detect the presence of flame in industrial boilers and furnaces. It provides safe shutdown feedback to prevent fuel delivery without ignition.

Question 2

What are the specifications of the Siemens QRB 4A photo cell?

Accepted Answer

The QRB 4A is a standard ultraviolet/infrared flame detector designed for universal burner applications. It operates in Siemens LAL and LMV burner control units and supports both single-electrode and dual-flame detection in industrial heating systems.

Question 3

Where can I buy a Siemens QRB 4A photo cell in Singapore?

Accepted Answer

3G Electric stocks the Siemens QRB 4A (SKU INV-SIEMEN-0087) at €21 per piece with same-day dispatch from our Woodlands warehouse. We supply Singapore industrial facilities, factories, and maintenance teams with rapid local delivery.

Question 4

How do I replace a Siemens QRB 4A photo cell in a burner control system?

Accepted Answer

Shut off fuel and power before replacement. Remove the old cell from its socket, clean the lens cavity, and insert the new QRB 4A unit firmly until seated. Test flame detection with the burner running to confirm proper operation and safe shutdown.

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SIEMENS Siemens :Photo cell QRB 4A @21euro/pc

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