Technical Description; Cd 6C And Cable Overview; The Hybrid Cable; The Loop Cable - Siemens LDS 6 Operating Instructions Manual

Technical Description

Technical Description
CD 6C – Water vapor sensor for LDS 6
A5E00912721-01
This chapter gives a technical description of the CD 6C laser gas
analyzer sensor. All parts of the system, including sensors and
hybrid cable are described.
4.1

CD 6C and cable overview

4.1.1 The Hybrid Cable

The hybrid cable is constructed for very harsh environments and
consists of two optical fibres, one for transmission of the laser
light to the measurement volume (single-mode fibre) and one
for the return of the detected signal (multi-mode fibre). Two
twisted electrical wires are used for powering the electronics in
the sensor (24 VDC). The hybrid cable is illustrated in Figure 4.1.
Figure 4.1 Hybrid cable

4.1.2 The Loop Cable

The loop cable connects the transmitter sensor to the receiver
sensor. This cable is a hybrid cable that does not contain the sin-
gle-mode fibre.

4.1.3 The CD 6C Sensor

The cross duct sensor, CD 6C (shown in Figure 4.2 on next page)
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
3
) applications.
4
25