Type / No.
Rev.
Date
Page
Total pages
EW082.695_en
5
02 August 2010
5
28
EsiWelma
s.r.l.
2
DESCRIPTION OF TERMINAL UNIT
The TUS40-20 is a terminal unit for monitoring and setting the UR.20. sensors and consists of:
theTUS40 handheld terminal
the UIC20 junction card
the 3m long CBL01 coiled cable
the two units communicate through a dedicated master protocol.
The TUS40-20 terminal unit is necessary when a mobile monitoring system is required and/or
for different settings of the gas detection threshold limit values from the ones that can be set
using the DIP switch; it is also necessary for recalibrating sensors if standard factory
calibration gas cylinders are not used.
NOTE: the words "detector" and "sensor" are used without distinction throughout this document
and have the same meaning, except where this may create ambiguity.
The system structure is shown in Fig. 2.1.
Fig. 2.1 –
Terminal unit for monitoring and setting UR.20.. sensors
Handheld
terminal
Junction card
Coiled cable