Xylem TB500 ONLINE TURBIDITY ANALYZERS - Manual (Page 8)

TB500 (2/07)
Rev. 1.0 4
1.4 The Touch Pad
Figure 2 illustrates the touch pad. The touch pad has four buttons: MODE/EXIT,
↵, t,
and
u. The MODE/EXIT button is used to cycle between the three operational modes of
the instrument: CAL, CONFIG, and AUTO (Measurement) mode. The
↵ button enters
the option (or mode that is highlighted or chosen. The
tand u buttons are used to change
settings.
Figure 2: Touch Pad
1.5 Vapor Purge
The TB500 is equipped with a continuous vapor purge system. A replaceable desiccant
pouch in the lower portion of the instrument dries the air. System heat is used to warm the
air. A fan inside the instrument continuously circulates heated dry air around the optical
well and the flow through cuvette. This feature eliminates the need for a dry purge line.
The TB500 monitors the replaceable desiccant pouch condition continuously. The LCD
display will show DESC on the lower line in the event that the desiccant pouch needs
replacement. Replacement desiccant pouches are available from Global Water or the local
representative (Model # TB500-DR). Refer to section 10.2 Replacing or installing the
Desiccant Pouch.
The desiccant can activate an alarm to notify the operator of a saturated desiccant. See
section 7.14 Desiccant Alarm.
2.0 Safety
This manual contains basic instructions that must be followed during the commissioning,
operation, care and maintenance of the instrument. The safety protection provided by this
equipment may be impaired if it is commissioned and/or used in a manner not described in
this manual. Consequently, all responsible personnel must read this manual prior to
working with this instrument.
In certain instances Notes, or helpful hints, have been highlighted to give further
clarification to the instructions. Refer to the Table of Contents to easily find specific
topics and to learn about unfamiliar terms.