RKI Instruments RI-215A - Manual (Page 14)

14 • Start Up RI-215A Operator’s Manual
Connecting the RI-215A to a Controller
Perform the following procedure to connect the RI-215A as a 3-wire 4 - 20 mA transmitter
to a controller.
1. Verify that power to the RI-215A has been turned OFF.
2. Connect one of the red wires from the RI-215A to the +24V transmitter terminal at the
controller.
3. Connect the other red wire to the - (DC ground) transmitter terminal at the controller.
4. Connect the yellow wire to the S or FB transmitter terminal at the controller.
Connecting the RI-215A to an External Alarm Device
CAUTION: The maximum current rating of the normally-open, dry contacts is 0.5 amp. If the
alarm device exceeds this rating, use the alarm contacts to control a relay with an
appropriate current rating.
1. Verify that power to the RI-215A has been turned OFF.
2. Connect the white wires to the external alarm. Refer to the wiring diagram in
Figure 3 on page 12.
3. If you do not connect the white wires to an alarm device, terminate these unused
wires.
Start Up
This section describes procedures to start up the RI-215A and place the RI-215A into
normal operation.
Introducing Power to the RI-215A
• Complete all installation procedures described earlier in this chapter.
• Verify that the wiring supplying power to the RI-215A has been connected correctly.
• Turn on or plug in the incoming power at the power source.
• Verify that the RI-215A shows a readout on its LCD as described in the next
subsection.
Warm Up
After you have turned on the power to the RI-215A, the unit takes about one minute to
begin operating. During this initial warm-up period, “CO2” is shown on the unit’s LCD.
After the initial warm up is completed, the gas sensor inside the RI-215A detects the
presence of CO
2
, and displays the concentrations of this gas on its LCD. Simultaneously,
the RI-215A also outputs a 4-to-20 mA signal (0 to 10 V optional) which corresponds to the
gas concentration.
CAUTION: Allow the RI-215A to warm up for an additional 30 minutes before continuing.