IM_ONE-01
9
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LATCH MODE:
(N/A on Model 8W2D)
The switch output can be configured to latch when the set point is reached.
• Latching Mode: In the Programming Mode, set “LCH1” to “ON”. The output changes to the switched state when the set-point is crossed, and will remain in
the switched state until it is manually reset by the user.
• To clear a Latched Output: Display will be reading "MAN RSET". To clear and exit, press both buttons .
• To return to the Process Display, without clearing, press the right button .
• To continue programming without clearing, press the left button .
.
PLUGGED PORT:
The One Series has the ability to detect process conditions which may indicate that the process port has become blocked, plugged or put into a “bypass” condition.
It does this by dynamically monitoring pressure changes over time. If the process does not change by a certain amount during the time period selected (both set
by the user), the display will indicate “PLUG” and the output will go to the “open” state.
There are four possible settings for the detection time:
• OFF • 1 Min. • 1 Hr. • 24 Hrs.
Setting the detection time to “OFF” disables the plugged port function. This should be done where danger of plugging is not a concern, or where the system
pressures may not change over time (e.g., a storage tank). If the feature is enabled the user must then enter the plugged port range. This number represents
the expected variation in the process variable. The number is limited to +/- 10% of the full scale range of the sensor. The diagram below illustrates the feature’s
operation.
T
0
Process variable ramp up
T
1
Process variable stabilizes, new thresholds calculated
T
2
Threshold exceeded, new thresholds calculated, timer reset
T
3
Low threshold exceeded, new thresholds calculated, timer reset
T
4
Plugged Port timer expires, Plugged port condition reported
T
5
Plugged Port condition cleared, new thresholds calculated, timer reset
T
6
Low threshold exceeded, new thresholds calculated, timer reset
T
0
T
1
T
2
T
3
T
4
T
5
T
6
DELAY:
In some applications, it is desirable to “dampen” the switch response and prevent intermittent false trips due to pressure spikes or other transient/isolated events.
The Delay feature provides a software digital filter with a programmable time constant for suppressing certain transient short-duration events. The filter settings
are:
• OFF • ¼ second • ½ second • 1 second • 2 seconds
NOTE:
The One Series typically responds to a process change in under 50 mSec. Using the Delay feature can lengthen the overall response time of the switch for
certain types of pressure changes.
• A shorter delay setting provides a faster response but is less stable.
• A longer delay setting provides a slower response and is more stable.
During a plugged port fault (the interval from T
4
to T
5
)
the
display will read “PLUG” and the switch will be set in the
“OPEN” state. The fault will be cleared if the pressure
varies outside of the detection range or if the feature is
disabled by the user.