- To connect 24 Vdc power, follow all applicable electrical codes and safety procedures. Open the analyzer enclosure and locate the gold box. Viewing the base of the gold box, connect the +24 Vdc wire to POWER terminal 1 and the return wire to terminal 2 (as shown in Figure 1)
- Connect the ﬁber optic cables from the probe or ﬂow cell to the proper bulkheads found on the base of the gold box to the right side. Connect one to Source A and the other to Detector A as shown in Figure 2. (For dual channel systems repeat using Source B and Detector B with the other probe ﬁbers.) Torque to 3in-lbs or very ﬁnger-tight if no wrench is available. Do not bend the ﬁbers to < 6in radius. (Fiber optic care instructions)
3. Allow analyzer to run for at least 30 minutes, then reference (Zero) the probe, as described below.
a. Insure probe or flow cell windows are clean and dry.
b. Block all stray light by wrapping the probe in a dark cloth (Caution – do not block the light path). Or insert the cleaning plug back into the ﬂowcell.
c. From the main screen press Channel A Answers, then REF, then Reference, then Continue. Transmission should be very close to 100% after referencing.Your probe may now be put in service.
4. Your probe may now be put in service.
5. Press Exit to return to Channel A Answers to view the measured value(s) in real time.
Connecting to a DCS or Other External Monitoring System (optional)
For Modbus TCP over Ethernet connect the Ethernet cable to the port on the bottom of the gold box. Please refer to the manual for instructions to ﬁnd the IP address, if needed. Please refer to the Modbus map for assistance with format, commands, and registers.
For analog I/O and relays connect as shown in Figure 3. For additional Answers or Channels see Appendix C in the manual.
I/O must also be enabled in the instrument. Press Exit, Conﬁguration, and 266344 (enter) to access the Conﬁguration menu. Press Conﬁgure 4-20mA I/O and press the appropriate buttons to enable the inputs and outputs you have connected. Press exit to return to the main menu
Examples of How to Wire-Up the Analog Output PCA
Each answer is associated with a 4-20mA output and a relay. For each Answer the 4 – 20 mA output is scaled to the Answers Range Low and High settings.
The relay for each Answer will be closed when no errors are present for that Answer.
For a two channel system the ﬁrst card is associated with channel A Answers 1 – 4 and the second card is for channel B Answers 1-4.
If you are running all of the analogs to the same place i.e. a DCS and you do not need individual channel isolation you can save some wire by running one common loop power wire as shown below.