ADS Environmental Services FlowShark QR 775002 A4 - Manual (Page 193)

8-6 ADS FlowShark Manual
If more than two devices are attached to the analog signal loop,
ADS strongly recommends load testing the loop.
Perform the following to determine whether too much load
exists on the analog signal:
 Connect the laptop to the ADS FlowShark monitor and
activate it (provided it is not already activated) with the
analog input parameters (as configured previously).
 Establish a Diagnostic session with the monitor and
observe the analog input value.
 Have the owner representative simulate a full-scale event
that causes the signal to go to 20mA with the ADS
FlowShark connected. The full-scale event may be
simulated via utilities in the transmitter that supplies the
signal or, in the case of a depth sensor, by placing a target
under the sensor that will indicate a maximum reading.
Magmeters usually have a utility to drive the output to full
scale. However, each device is different and, in some
cases, there is no way to simulate maximum output. In this
scenario, calculate the load by measuring the voltage that
drives the loop and then measuring the resistance added by
each device on the loop. This load calculation should be
performed by the owner’s instrumentation representative
because it requires toggling power to different devices and
disconnecting/reconnecting the signal and possibly power
wiring.
Note: If the load is too great and/or the analog signal
is controlling the customer equipment, a loop isolator
must be installed before proceeding.
5. Install and connect the FlowShark monitor to the analog signal
as follows:
 Run the analog I/O cable (ADS p/n 5000-0698) from the
ADS monitor to the signal source. This usually entails
creating an entry into an enclosure. Therefore, the owner
representative will need to be present to power off the