COSA Xentaur Xentaur XDT - Manual (Page 36)

Section 3: Instrument
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• The alarm set point is programmed on a third alarm, hence the HI and LO alarm relays are free
to be used for additional purposes The third alarm is properly configured to 39°F at the fac-
tory, but when necessary may be modified by the user. Refer to the notes following HI & LO
Alarms in the Flow Diagram of Operating State User Interface in appendix A.
• The visual indicator is the display backlight. When there is no alarm condition the LCD dis-
play is not backlit but can still be easily and clearly read (in an extremely dark room the back-
light may be momentarily turned on by pressing the TEST button). However as long as an
alarm condition exists the LCD will be backlit in red. This lit-up front window of the instru-
ment is the visual indicator.
• This configuration is also equipped with a NEMA sealed audio indicator (>80dB @ 3ft)
mounted in the instrument enclosure. It is activated when an alarm condition occurs, it may be
disabled by momentarily pressing the RESET button on the front panel. When the alarm con-
dition ceases to exist, the audio indicator is automatically re-enabled, ready to be activated on
next alarm condition.
• A momentary TEST button on the front panel allows testing both the visual and audible indi-
cators.
3.6 Maintenance
The XDT-PM and XDT-NEMA instrument enclosures may be cleaned when necessary using a
damp (moist) cloth.The XDT-OEM bare circuit board may be cleaned by blowing air across the
circuit board. The sensor should not be cleaned as it may be damaged.
Spare parts may be ordered through your representative.
3.7 Troubleshooting the Instrument
This instrument performs diagnostic tests on power up as well as once every two minutes. The
table that follows, depicts all possible error/unexpected messages that may be displayed on the
instrument. For each message the table has explanations for the reason, and if necessary a sug-
gested action to remedy it.
The instrument contains a fuse which may open if the instrument is subjected to voltages exceed-
ing the specifications. Under these circumstances the unit display will be blank and the instrument
will not draw any current when powered up. The user may replace the fuse with a comparable
0.5A, 250V fast acting fuse, to locate the fuse refer to the XDT mechanical drawing in
Appendix E.