Manual 7960-902
Page
3 of 6
DIP Switch Position 1: CO2 Output Selection
ON: Output set to voltage output
OFF: Output set to current output
DIP Switch Position 2: Temperature Output Selection
ON: Output set to voltage output
OFF: Output set to current output
DIP Switch Positions 3 & 4: Current or Voltage Output
Range Selection
Output Range
DIP Switch 3
Position
DIP Switch 4
Position
2-10 V
4-20 mA
ON
OFF
0-10 V
0-20 mA
OFF
OFF
0-5 V
0-10 mA
OFF
ON
1-5 V
2-10 mA
ON
ON
DIP Switch Position 5: Menu Access
ON: Menu Enabled
OFF: Menu Disabled
CURRENT/VOLTAGE OUTPUT
On the Series CDT, the transmitter may be wired for
current or voltage output for both carbon dioxide and
temperature. The transmitter can be powered with either
16-35 VDC or 19-28 VAC. Wire the transmitter according
to Figure 4.
Optional relay can be used as either a dry
contact or low voltage switched circuit up
to 2 A at 30 VDC
FIGURE 4
Active Output Wiring Diagram
POWER
SUPPLY
TEMP
RECEIVER
CO2
RECEIVER
REMOTE DISPLAY
For models that are ordered without an integral LCD
display, remote display Model A-449 can be used to
display the temperature, and carbon dioxide. The mini
USB plug of the remote display plugs into the receptor on
the side of the housing. After a short warm up time, the
display will begin to show the current temperature and
carbon dioxide measurements unless configured by the
user to show only temperature or only carbon dioxide.
EDITING MENU PARAMETERS
Before any adjustment can be made to the transmitter,
the Menu Lockout Dip Switch must be set to the “On”
position (See Figure 3)
ACCESSING MENU PARAMETERS
Step 1: To enter the menu structure, press Up button and
Down button simultaneously for 5 seconds (display
will show RON parameter).
Step 2: Press Up button or Down button to cycle between
menu items.
Step 3: Press Enter to edit the value for the displayed
menu item (SET will appear on display).
Step 4: Press Up button or Down button to adjust the
value of the menu item. Step 5: Press Enter
button to save the changes (SET will disappear).
Step 6: Repeat Steps 2 through 5 for each of the
parameters.
Step 7: To exit the menu at any time, press and hold Up
button and Down button simultaneously for 5
seconds or wait 10 seconds without pushing any
buttons.
FIGURE 5
Side View of Transmitter
