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Solid-State Switch and Form C Outputs
The four Form C mechanical relays, and one NO solid-state switch pulse output are completely independent, electrically
isolated and can be programmed as either pulse or setpoint outputs .
Totalizer Pulse Output
When the Totalizer function is selected, the unit of measure and resolution are independent of the displayed units, and can
be programmed where 1 pulse occurs once every 0000000 .1... 999999999 of units selected, with any pulse width from
0001...9999 mS .
Setpoints
The setpoint programming is extremely powerful and flexible, with unit of measure and resolution independent of the
displayed units . Since the setpoint, release point and their associated time delays are fully independent, the alarm can be
either a high rate or low rate, depending on whether the setpoint is selected greater than the release point, or the release
point is greater than the setpoint . For applications where the relay must remained energized, once set, a latching feature is
provided . When latched, the relay remains energized until reset from the front panel . While design planning, note that both
the relays and the pulse outputs can be programmed as alarm points and only the relays provide both normally open and
normally closed contacts . The switch is a simple NO contact .
Terminology
Display
Definition
SETPT
Setpoint
SDLY
Setpoint time delay
LATCH
Locks relay in energized state
RELP
Release point
RDLY
Release point time delay
High Flow Set Point
The SETPT must be a value greater than the RELP . The relay output will have continuity between its N.C. terminal and COM
until the flow has exceeded the SETPT for a continuous period of time exceeding the SDLY . At this time, the N.C. connection
opens and the N.O. contact will have continuity to the COM terminal . When the flow has dropped below the RELP for a
continuous period of time exceeding the RDLY, the relay states return to the original states . If the latch has been set to ON
once the setpoint and set delay have been satisfied, the relay will not release until manually reset .
Low Flow Set Point
The SETPT must be a value less than the RELP . The relay output will have continuity between its N.C. terminal and COM until
the flow drops below the SETPT for a continuous period of time exceeding the SDLY . At this time, the N.C. connection will open
and the N.O. contact will have continuity to the COM terminal . When the flow again has risen above the RELP for a continuous
period of time, exceeding the RDLY, the relay states return to the original states . If the latch has been set to ON when the
setpoint and set delay have been satisfied, the relay will not release until manually reset .
October 2017
Function
If the setpoint value is a greater than the release point value, when the
displayed flow rate exceeds the setpoint, the Set Point Delay timer starts . If the
setpoint is less than the release point when the flow drops below the setpoint,
the timer starts .
If the setpoint remains crossed for a continuous period of time exceeding the
setpoint delay setting, the relay energizes . If the flow rate briefly re-crosses
the setpoint before the timer reaches its setting, the timer resets and waits for
another setpoint crossing before restarting the count from zero .
If Latch is chosen, once energized by the setpoint time delay, the relay remains
energized until a reset is selected from the front panel . Otherwise, the relay
de-energizes when the Release Point Delay Timer times out .
If the relay is already energized, is not latched and the flow input crosses the
release point, the Release Point Delay timer starts .
If the release point remains crossed for a continuous period of time and
exceeds the release point delay setting, the relay de-energizes . If the flow rate
briefly re-crosses the release point before the timer reaches its setting, the
timer resets and waits for another release point, crossing before restarting the
count from zero .
CTL-UM-01026-EN-05
Programming
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