Connecting to External Devices DF-310E 49
Pump Cable (Must be separate from sensor cable)
Distance in Feet Minimum Wire Size
0 – 500 #20 AWG
500 – 1000 #18 AWG
Table 10: Pump Cable Specification
FLOW-B
UNUSED
FLOW-A
UNUSED
PUMP +
PUMP -
A OUT -
A OUT +
GND
UNUSED
UNUSED
UNUSED
UNUSED
24V RTN
UNUSED
+24V
J3 J4
Figure 23: J3/J4 Connector Wiring
In addition, the following options are available:
If factory configured, Servomex will supply the standard pump that the user may install remotely
and power through the PUMP – and PUMP + connections on the rear panel connector J4.
Control would be accomplished in the same manner as a standard pump.
OR
If factory configured, a switch closure rated at 1A/30VDC can be supplied between the PUMP -,
+ connections on the rear panel connector J4. The contacts can be used to control a Servomex
supplied pump that is powered from a separate 12 VDC, .3 A source. Control of the pump would
be accomplished in the same manner as a standard pump.
OR
If equipped, the pump may also be turned on and off remotely through the pins labeled EXT 1 or
EXT 2 on the J6 connector. If equipped, the Diagnostics Screen will indicate to what set of EXT
contacts this option is assigned, either 1 or 2.
While the display is in the normal O2 mode, a voltage of 5-28 VDC applied to the appropriate
contact pairs labeled EXT 1 or EXT 2 will turn the pump off. The pump will stay off until this
potential is removed.
NOTE: Turning the pump off in this way will make control of the pump from the keypad
impossible.
7.5 Remote Sensor Installations
NOTE – Remote sensor installations void CSA approval, if any.
The oxygen sensor for a DF Series analyzer may be installed outside of the analyzer cabinet.
Areas of high convected or radiated heat must always be avoided. If installed outdoors, the
sensor enclosure must be shielded from the sun to avoid overheating. In addition, a heater must
be installed in the enclosure in areas where the temperature goes below freezing. (See page 53)
Care must be taken to use high quality cable and techniques when making remote electrical
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