User guide

3.10.2 Launch and Detect Unit Wiring – Standard for CE/ATEX
Launch Unit (to Detect) Terminations TB-7 (ensure 360˚ cable shield ground)
Detect Unit (to Launch) Terminations TB-7 (ensure 360˚ cable shield ground)
SPECIAL NOTE: Noise sources magnetically coupled to the 4-pair launch to detect cable can cause errors to the
measurement if the frequency and applied total voltage meet or exceed the following; Frequency range of 0.1 to
7.5 MHz and Total induced voltage of 3Vrms.
A combination of these parameters will cause measurement error outside of the analyzer performance
specifi cation. In practice, these potential errors can be easily avoided by routing the 4-pair launch to detect cable
away from electromagnetic interference sources that could exhibit these parameters. Such sources might include
power transformers, electric motors, electric welding machinery, high voltage power lines, etc. Analyzer grounding
wires and any other I/O lines such as 8-pair launch to utility panel cable or A I/O cables to/from the DCS should
also be installed with similar basic practices to also ensure there is no additional adverse infl uence on any of the
I/O signals.

<3 INSTALLATION AND WIRING> 3-16
IM 11Y01B02-11E-A 5th Edition :June 5, 2012-00