Photoresistant - uv cell siemens qra 2- SIEMENS - QRA2
  • Photoresistant - uv cell siemens qra 2- SIEMENS - QRA2

Photoresistant - uv cell siemens qra 2- SIEMENS - QRA2

502310
€294.66
Quantity

Colissimo Delivery expected from 2026-09-24

Available

Delivery & returns
  • ✓ Free delivery on orders over €79 in France
  • ✓ Free returns within 30 days
Find out more about terms and conditions

The SIEMENS UV QRA2 flame detector is designed for use in SIEMENS safety control units monitoring the flames of gas and oil burners. This detector monitors the ultraviolet radiation emitted by the flames of gas and fuel oil burners to generate a flame signal. The internal bulb and the electrodes generate a spark when exposed to light in the 190–270 nm spectrum.


Features of the SIEMENS QRA2 detector



  • Part number: QRA2
  • Brand: SIEMENS
  • Tightening torque for QRA2 box screws: Max. 0.3 Nm
  • UV detector probe
  • For PLCs and flame supervisors operating intermittently, without attachment hardware

Advice from our technicians


The SIEMENS flame detector is tested using a multimeter set to the ohmmeter setting. The resistance value must be between 200 and 300 when the flame is detected. If the reading is above 300, it is advisable to clean the detector.

Features of product: PHOTORESISTANT - UV CELL SIEMENS QRA 2- SIEMENS - QRA2

Package Weight (kg)
0.049
Package Height (m)
0.025
Package Width (m)
0.07
Package Length (m)
0.11

The Keys to Siemens Regulation: From Sensor to Actuator

In building management systems (BMS), Siemens components are essential for automation. A high-performance system relies on seamless communication between the measuring device and the control element.

1. Siemens Thermostat: Measurement and Comfort

The Siemens thermostat is the dialogue point between the user and the heating system. It is not just used to display the temperature but also to finely control heating, often through sophisticated protocols.

We provide wired or wireless programmable room thermostats, essential for managing independent heating zones and optimizing time slots. Choosing the right model ensures precise settings (+/- 0.5°C), directly translating into savings.

2. Siemens Actuator: Action and Efficiency

The Siemens actuator is the hydraulic actuator. Its role is to precisely position valves (mixing valves or zone valves) in order to control the flow of hot water to a given circuit.

As the centerpiece of the heating zone, it must be fully compatible with the regulation electronics (0-10V signal, 3 points) and the valve it is mounted on. Replacing a faulty actuator allows for immediate restoration of optimal control over the water mix (supply/return) and avoids unnecessary overheating.

Advice for Identification and Compatibility

With Siemens' extensive and highly technical range, it is vital to check the specifications of the part to be replaced:

  • Product reference: Always rely on the 7 or 8 character code on the label (e.g., RDE10.1). This code determines the function, voltage, and communication protocol.

  • For Actuators: Check the power (torque) and stroke duration (opening/closing time) to ensure it can move your valve.

Expert Tip: When replacing a Siemens thermostat or a Siemens actuator, check the configuration of the dip switches or the initial programming. Incorrect calibration of the zero point or end stroke can lead to malfunctions, even if the part is new.

Ensure the reliability of your regulation system with ExpertByNet, the specialist in Siemens components for HVAC.

Carrier Information Price Delivery