COM.AIR
Dew Point Monitor
04/02/2015
Rev. B
10
3.0 FUNCTIONAL DESCRIPTION (CONTINUED)
“CHK SNSR” :
If during the ABC Cycle, the reflectivity has
increased
significantly due to
excessive drift of the optics, or abnormal circuit performance, this message will appear. To
determine the cause, take the following steps.
-Clean the mirror.
-Initiate an MABC Cycle.
-Check the sample system for proper flow.
-Check for loose connections or components on the printed circuit board and sensor.
If the condition cannot be resolved with these checks, contact Edgetech for service
3.2 MABC Button
Pressing the MABC Button (
M
anual
A
utomatic
B
alance
C
ycle) at any time will initiate an ABC
Cycle.
3.3 SILENCE Button
If the measured dew point exceeds the Alarm Set Point, the audible alarm will sound. Pressing
this button will silence or disable the audible alarm for a period of about 60 minutes. After the 60
minutes, the audible alarm will be automatically re-enabled. The alarm message on the display
and the alarm relay will remain on.
3.4 Flow Control Valve
The sample flow rate is adjusted using this valve. Although the sample flow rate is not critical for
proper operation, the recommended rate is 1
– 2 SCFH (
S
tandard
C
ubic
F
eet per
H
our).
3.5 Alarm Relay Output
The Alarm Relay is a SPDT relay that is energized whenever the dew point exceeds the Alarm
Set Point.
During an ABC cycle, all alarm functions, including the relay, are disabled.
However, if an ABC Cycle is initiated when an alarm condition is present, the relay will remain
energized until the cycle is complete.
At the end of the cycle the relay will remain energized if the alarm condition is still present or be
de-energized if the alarm condition has passed.
3.6 Analog Output
The analog output is a 4 to 20 ma output, proportional to the dew point, and scaled at the
factory for
–58 to 122 °F (-50 to 50 °C) for S1 and S2 Sensors; -103 to 167°F (-75 to 75°C) for
S3 sensors.
During an ABC Cycle, the output is “held” at the last dew point until the routine is completed.
Summary of Contents for COM.AIR
Page 6: ...COM AIR Dew Point Monitor 04 02 2015 Rev B 6 FIGURE 2 1 MOUNTING ...
Page 7: ...COM AIR Dew Point Monitor 04 02 2015 Rev B 7 FIGURE 2 2ACCESS PANEL REMOVAL ...
Page 8: ...COM AIR Dew Point Monitor 04 02 2015 Rev B 8 FIGURE 2 3WIRING CONNECTIONS ...
Page 12: ...COM AIR Dew Point Monitor 04 02 2015 Rev B 12 FIGURE 4 1SETUP ...
