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Section 3: Instrument
17
switches described above.
• With a front face plate which has labeled holes placed immediately above the circuit board
switches, thus the operator may push the switches without removing the face plate, by making
use of a probe such as a paper clip.
• With a front plate containing four membrane switches connected to the circuit board, provid-
ing the operator with a easy to use interface.
In general the MODE button navigates through the different user options “Modes”; the UP and
DOWN buttons modify the units, values or choices in the selected mode. Refer to the flow dia-
grams in Appendix A for detailed overview of button functionality. A button may be held down
for a prolonged time, for accelerated incrementing or decrementing of numeric values.
3.4.4 Operating State
Upon power up, the unit performs certain initialization tests (see table in section 3.6), and enters
the ‘Operating State’, in the Viewing Dewpoint mode. Depressing the ‘MODE’ button will
change modes (see appendix A) in the following order: nViewing Dewpoint oAlarms pStart
Calibration qViewing Serial Number (back to) nViewing Dewpoint. The unit will return to
Viewing Dewpoint mode if no buttons are pressed for 30 seconds, unless it is performing a cali-
bration.
3.4.4.1 Viewing Dewpoint Mode
In this mode the user can view the dewpoint, this is indicated by the presence of the ‘DEW-
POINT’ legend on the lower left of the display. The available engineering units in which to view
the moisture content are °C, °F, PPM, LBS and G/M
3
; the UP and DOWN buttons scroll back and
forth through these units in respective order. The °C and °F are dewpoint readings. The PPM is
LOW RELAY
HI RELAY
NC
NO
C
NC
NO
C
CAUTION
RELAY
VOLTAGE
oo
GND
GND
10VA
50/60HZ
100-250VAC
J.F.M.A.M.J.J.A.S.O.N.D
2003
2002
2001
2000
S4
S3
S2
S1
R
S
R
P
E
D
O
M
MADE IN USA
XDT (C) 1999 XENTAUR CORP.
PS+
RET
RXD
TXD
A.OUT
A.RET
SIGNAL-RET
SIGNAL-IN
ACH
ACN
DEWPOINT TRANSMITTER
CU
S
R
DEWPOINT TRANSMITTER
Remove front plate to access control buttons, consult the manual.
DEWPOINT TRANSMITTER
DEWPOINT TRANSMITTER
MODE
UP
DOWN
PRESSURE CORRECT
Use probe (paper clip) to push control buttons, consult the manual.
MODE
PRESSURE
CORRECT
CHOICES
VALUES
UNITS
UNITS
VALUES
CHOICES
Panel Mounted Instrument with a solid silkscreened face plate
Bare board, or Instrument opened for access.
Panel Mounted Instrument with a silkscreened face plate with holes
Panel Mounted Instrument with membrane switches
Pushbuttons