Flowline LU78 EchoSwitch - Manual (Page 9)

Rev A MN300282 9 of 34
GETTING STARTED (continued) Step Four
o ALARM – Alarm operation allows for a single set point (Relay ON and OFF at the same level).
Choose between HIGH and LOW operation. Both operations will require a single set point and a
setting for the Hysteresis (HYSTER)
 HIGH – used to control a High Level alarm. Relay will energize (ON) when the level is above
the setting and will de‐energize (OFF) when the level falls below the setting plus the added
distance from the hysteresis (HYSTER).
 LOW – used to control a Low Level alarm. Relay will energize (ON) when the level is below
the setting and will de‐energize (OFF) when the level rises above the setting plus the added
distance from the hysteresis (HYSTER).
 HYSTER – Used to reduce chatter by creating a hysteresis or differential for the Alarm set point.
The HYSTER value will adjust the OFF position of the Alarm setting by the HYSTER value.
 SAFE – Each relay can be individually configured to its own fail‐safe setting. Choose between ON, OFF or HOLD.
o ON – Energizes the relay when a fail‐safe condition occurs
o OFF – De‐energizes the relay when a fail‐safe condition occurs
o HOLD – Keeps the relay in its current state when a fail‐safe condition occurs
o OUTPUT – Sets the 4/20 mA output state when the echo is lost. The options are 4mA, 21mA and
hold last value.
 M‐PLEX – when two or three relays are configured as pumps, they can be inter–connected to alternate
between each cycle.
o M‐PLEX is only available when 2 or more relays are set for pumps.
o M‐PLEX will not appear when only 1 relay is set for a pump or when the relay functions do not
match (ex: Relay 1 set for a filling pump and Relay 2 set for an emptying pump).
o Selecting NO‐ALT will turn OFF the M‐PLEX.
 HELP – Provides setup information, the ability to reset the EchoSwitch® and a simulation mode to test the
relay function
o SETUP – Will display the setting for all functions of EchoSwitch®
o RESET – Will reset the EchoSwitch® back to its original factory setting
o SIM‐T – SIM (ulation)‐T(est) will allow the end user to simulate changes to level to verify the relay
settings. Using the UP and DOWN buttons will increase
o TEST P – This is a production test feature used by the factory to confirm operation. This mode
should only be used when supervised by a Flowline representative.
 RUN – Returns the unit to normal measurement and control mode