Simtronics GD1 MK3, Operating Manual

Page: 23 / 76

GD1 Page 23 of 76 850-816926-EN R06
3.3. Fine tuning
Please be aware that the GD1 4 – 20 mA output going to control system is set to 2
mA during alignment, 1 mA during during power up and after reset to
measurement mode (Init).
Note! Poor alignment will reduce system performance. Use care to ensure good alignment.
Be aware that the nature of the GD1 system's laser beam implies a smaller target area than
with traditional open path systems, and higher alignment accuracy is needed to achieve
sufficient optical transmission levels.
Tuning of signal strength (transmission tuning) can be performed with two different
methods:
•
Using a Web browser through an Ethernet connection. This is the preferred
method.
•
Using a HART® terminal connecting through the 4-20 mA current loop (Primary
current loop) and a multimeter.
Both methods are explained in the two sections below.
3.3.1. Using a Web browser for tuning of signal strength
All functions for the GD1 Service Interface are described in section 10.5. The procedure for
fine alignment and transmission tuning is as follows:
# Step description Illustration
1
Clean the lenses of both transmitter (TX) and
receiver (RX) for any dirt before proceeding. The
optical path should be clear at the time of
aligning (avoid fog, mist, steam, rain, snow, etc.).
2
On the transmitter, connect the Ethernet
adapter to the Junction Box terminals 3 - 6.