11
In this application (above) the Fan or primary relay is used as a low level alarm relay. The Alarm or secondary relay is used as a
supervisory relay when utilized in the normally closed configuration. The TX-6 monitors all critical functions of the unit through software
diagnostics that continually test and verify its operations. If a problem is found, the unit will switch to a fail-safe/error mode or trouble
condition. In this error mode the Fan* and Alarm relays will be activated indicating the trouble condition at panel and the RD-6 display
will flash the error. *See the Trouble Fan Setting Option.
Power Up
The TX-6-ND steps through an internal self-test cycle for the first 1 minute that it is powered. The unit will execute the test cycle any
time power is dropped and reapplied (i.e. power failure). During the self-test cycle the unit will display the Firmware Version number and
the gas type, then count down from 60 to 0 (if the display option is “on”) and finally go into normal operation. The alarm relay will be
activated for 10 seconds and the fan relay for 60 seconds during the power-up cycle unless the “Power Up Test” (PUt) option is OFF.
The indicator light (LED) will flash green during the self-test cycle. At the end of the 1 minute cycle, the unit will take its first sample of
the air and the indicator light will turn solid green.
Operation
1.
With the display function turned “On”, the TX-6-ND will show the current concentration of NO
2
ppm or “0.0” (zero) in clean air.
When the NO
2
concentration reaches the Fan Relay setting (1.0ppm, for example) the display will flash back and forth between
“FAn” and “1.0”. With the display function turned ”Off”, the display does not show the gas concentration, but will show “FAn” as
long as the fan relay is activated.
2.
With the display function turned “On” and the NO
2
concentration reaching the Alarm Relay setting, (5.0ppm, for example) the
display will flash back and forth between “ALr” and “5.0”. The buzzer will sound indicating “Alarm” if the buzzer is turned “On”.
