Dwyer ULSS - Manual (Page 29)

Rev 5 MN890570 29 of 30
TROUBLESHOOTING Step Twelve
PROBLEM SOLUTION
Transmitter indicates a
current of 0 mA Check the wiring for an open circuit. An open circuit is the most
common issue with a 0 mA signal.
Transmitter jumps to a
current reading between
19 and 20 mA Check the installation of the transmitter. Bad installation
fittings will cause false signals near the top of the tank, which
typically translates to a signal between 19 and 20 mA. Also look
for interference just below the transmitter. If the transmitter is
installed in a metal fitting, switch to a plastic fitting.
Transmitter indicates a
current over 23 mA Immediately check the wiring for a short circuit. The Series ULS
is current limited to 22 mA. Anything above 23 mA indicates a
short circuit.
Transmitter always jumps
to the LOST condition Check the dimensional configuration (Height and Fill‐H) of the
Series ULS. Make sure that the Fill‐H setting corresponds to the
full level of liquid (from the bottom up) and not the distance
from the transmitter to the liquid (top down).
Output of transmitter is
opposite of the level of
liquid Check the Output at Empty Setting.
No Unit Detected in ULSX‐
CAL ULSX‐CAL cannot detect a Series ULS connected to the
computer.
 Check that the Fob is connected to the USB port.
 Check that all four wires (Red, Black, White and Green) are
securely attached to the Fob.
 Check in Device Manager that drivers are present under
Universal Serial Bus controllers.
Internet error. The server
name or address could not
be resolved. This is a warning indicating the computer configuring Series ULS
is not connected to the internet. Click OK to continue. Dwyer
Instruments, Inc recommends being connecting to the internet
for all configurations. Not being connected to the internet will
not prevent the Series ULS from being configured.
Cannot access some of the
features in Configuration As choices are made in Configuration, ULSX‐CAL will begin to
eliminate functions that are no longer active. To reset
Configuration or get access to all the features, click on the Clear
Screen button.
Relay closes, but does not
open again An inductive kick may be holding the relay closed. If switching
24 VDC, make sure a diode has been installed to act as a
snubber (see Step Eight). Note: Series ULS uses latching relays.
When power is removed to the sensor, the relays will remain in
their last state. Ex: If the relay is energized, when power is
removed, the relay will remain in an energized state.
Relay chatters on and off
repeatedly Most likely the turbulence in the tank is causing the chatter.
Increase the Hysteresis setting to correct.