16 95-85561.1
FULL ALIGNMENT PROCEDURE
Completion of the Full Alignment procedure is recom-
mended when maximum optical signal strength is
required at the receiver module — typically in outdoor
applications and areas with high levels of optical con-
tamination or fog. It is necessary to complete the Basic
Alignment procedure before starting the Full Alignment
procedure.
In addition to the equipment needed for Basic
Alignment, Full Alignment requires the use of a hand-
held HART communication device such as the intrinsi-
cally-safe Emerson Model 375 HART communicator.
The use of Alignment Kit p/n 007745-001 is also highly
recommended to enable precision control of the vertical
and horizontal alignment orientation of the OPECL
Receiver module. The OPECL transmitter is not adjust-
ed in the Full Alignment procedure.
HART Communicator Notes
• For hazardous areas, ensure that the HART communi-
cator is certified for use in classified areas.
• The HART communicator must include the Device
Descriptor (DD) software menu for OPECL. The use
of a HART communicator without the proper DD’s may
establish generic mode HART communication, but will
not allow Full Alignment to be completed. Refer to the
HART Appendix for additional information.
•A minimum level of understanding with regard to the
operation and navigation of the HART communicator
is required to complete the Full Alignment procedure.
Please refer to the appropriate HART communicator
instruction manual for basic operating instructions if
needed. Additional information on the use of the
HART communicator is provided in the HART
Appendix in this document.
• For proper HART communication to occur, a 250-500
ohm resistive load is required in the 4-20 mA signal
loop (as shown in Figures 10 to 13).
After completion of Step 15 in the Basic Alignment pro-
cedure, begin the Full Alignment procedure.
1. Install the horizontal and vertical alignment tools
from the Alignment Kit as shown in Figure 16.
Ensure that the horizontal alignment tool clamp is
tightened on the mounting post.
2. Connect the handheld HART communicator to the
Receiver module’s onboard HART communication
port.
3. Turn on the HART communicator and inspect for
OPECL device recognition. When HART communi-
cation is established, the OPECL Receiver Root
menu will be displayed on the communicator display
screen.
4. From the Root Menu, select the Test Menu (selection
5).
5. From the Test Menu, select the Alignment Menu
(selection 6).
6. The Alignment Menu will display the following
screen:
7. If the value displayed to the right of “Reference” is
greater than 900, stop Full Alignment. Too much
optical energy is present at the receiver, and the
separation distance must be increased to a mini-
mum of 20 meters. If the reading is below 900, pro-
ceed to step 8.
8. From the Alignment Menu, select Enable Alignment
(selection 4). This places the receiver in Alignment
mode, resulting in:
A. an Amber LED on the receiver.
B. default analog signal of 1 milliampere, causing a
fault condition to be displayed on the Detronics
R8471J gas controller.
C. no signal levels above the default signal level or
alternative level as programmed.
NOTE
When the Alignment mode is enabled, the HART
communicator occassionally displays a message
stating “Non-zero status codes found. Ignore the
next 50 occurences?” When this occurs, enter
“Yes”, and continue the Full Alignment procedure.
below value 900.
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