The Cd 6C Sensor - Siemens LDS 6 Operating Instructions Manual

Technical Description

4.3 The CD 6C sensor

4.3 The CD 6C sensor
The cross duct sensor, CD 6C (shown below) is designed for in situ measurements. It
consists of a transmitter and a receiver creating a single path measurement situation. The
beam diameter is expanded to about 25 mm in order to improve performance in high dust
load (>1 g/m
Figure 4-2
1. High pressure flange.
2. Process side purging input with check valve. (only if process purging is applied)
3. Sensor side purging output with check valve.
4. Sensor side purging tube.
5. Sensor side purging input needle valve.
The transmitter includes a lens and a connection for the optical fiber located in the focal
plane of the lens. The receiver contains a lens and the sensor electronics. The sensor
electronics consist of the detector module and the sensor card. The powering of the sensor
electronics is performed with a twisted pair copper cable delivering 24 VDC. The detector
card is a detector with pre-amplifier, and the sensor card consists of driver electronics for the
optical return signal and DC/DC-converter.
The laser light is coupled from the optical fiber in the transmitter to its lens and passes
through a wedge tube (for protection of the lens) and then through the measurement volume.
The lens in the receiver (also protected with a wedge module) focuses the incoming laser
light on the detector where it is converted to an electrical signal. This signal is amplified and
converted to an optical signal and returned to the central unit. The mounting of the sensor
requires a flange with the dimensions DN65/PN6 or ANSI 4"/150 lbf.
28
) applications.
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1
2
3
Sensor CD 6C - transmitter
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Operating Instructions, 12/2007, A5E00912721-02
Sensor CD 6C Operating Instructions