RKI Instruments Beacon 800 - Manual (Page 37)

Beacon 800 Gas Monitor Operator’s Manual Recorder Output Board • 34
recorder output board to TB3 on the main board below the power supply. If the heavy duty
relay board is also installed, this cable has an additional section which connects to TB5 on
the heavy duty relay board.
The recorder output board provides a two linear analog signal outputs for each active
channel, giving the reading for the channel. They are a current output and a voltage
output: 4-20 mA (milliamps) and 1-5 V (volts). Either one or both may be monitored by a
chart recorder or any other appropriate device. A current monitoring device must have
have 500 ohms resistance maximum and a voltage monitoring device must have 500
ohms resistance minimum.
Wiring
Perform the following procedure to connect a recording device to the recorder output
board.
1. Turn off Power to the Beacon 800 at the power source.
2. Open the Beacon 800 door and place the power switch in the off position.
3. Install an appropriately rated cable bushing or conduit in an unused conduit hub on
the bottom of the Beacon 800 housing.
4. Route wires in conduit or shielded cable from the recording device through the
selected conduit hub into the Beacon 800.
When wiring to the 4 - 20 mA output, keep in mind that the maximum allowable
resistance including the current monitoring device and wiring can be no greater than
500 ohms.
When wiring to the 1 - 5 V output, keep in mind that the minimum allowable
resistance of the voltage monitoring device and wiring is 500 ohms.
5. Connect the wires to the recorder output board as illustrated in Figure 14. See the
monitoring device’s instruction manual for connections at the monitoring device.
Figure 14: Recorder Output Board Wiring
Typical Wiring
Current
Monitoring
Device
Voltage
Monitoring
Device
Current
Monitoring
Device
Voltage
Monitoring
Device
Optional Wiring for Simultaneous Monitoring of
Current and Voltage Output
Recorder Output Board
(Installed in Beacon 800)
J2