Van Air Systems Dew Point Meter 46-2529 2-02 - Manual (Page 7)

5
Remote Alarm Connection (TB1)
The terminals labeled NC, COM, and NO are for alarm indication. The NC and COM are closed when
there is no alarm. The NO and COM terminals close when alarm occurs. Connect wires to terminal block
on PC Board. For Relay #1, 4 & 5 are normally closed. They make continuity when the dew point is
below set point (green light). 5 & 6 are normally open. They make continuity when the dew point is
above set point (red light). For Relay #2, 7 & 8 are normally closed and 8 & 9 are normally open.
Auxiliary Alarm Indication (TB2)
An open collector output on TB2 can be used to access alarm status. TB2 terminal 2 normally floats, and
is pulled low when SET1 is exceeded. Terminal 4 is the output for SET2 if the board is a dual.
Terminals 1 and 3 are 12VDC sources for these outputs. The maximum load through each output is
20mA.
Auxiliary Non-Alarm Indication (TB3)
An open collector output on TB3 can be used to access alarm status. TB3 terminal 5 normally is pulled
low, and floats when SET1 is exceeded. Therefore, these outputs are active when no alarm is present.
These can be used to light a green pilot lamp, for example. Terminal 7 is the output for SET2 if the
board is a dual. Terminals 4 and 6 are 12VDC sources for these outputs. The maximum load through
each output is 20mA.
Recorder Output (TB3)
The 6392N provides both outputs, 0-5VDC at terminal 1 and 4-20mA at terminal 3, which represent
-40
F to +70 F. Terminal 2 is signal ground.
-40°F=0V or 4mA; +15°F=2.5v or 12mA
Auxiliary Pump Power (TB5)
115VAC is available on TB5. If the board is set for 230VAC, the voltage at TB5 is stepped down to
115VAC so only one pump type is needed for both applications.
F. TO C. Display Change
To change the digital display to
C, use needle nose pliers and more jumpers J6 and J7 to the C position.
115 TO 230V Change
Remove Jumper J1 and J3 and add Jumper to J2.