IM_1GSW-02
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OFFSET:
Offset adjustment changes the zero point without changing the slope of the calibration line. The Excela is factory calibrated to
0.5% of sensor range at room temperature. In some applications, it may be necessary to re-calibrate the unit in the field. Offset
allows the user to enter a positive (“POS”) or negative (“NEG”) offset to the display readings. An offset of up to +/- 10% of the
range is allowed.
NOTE:
Any numerical value entered other than 0.00 will cause the display to indicate “Offset” just above the process reading in
the process display.
USE OF THIS OPTION MAY CREATE A CONDITION WHERE THE DISPLAY MAY INDICATE “0.00” WHEN SIGNIFICANT PRES-
SURE OR TEMPERATURE(10% OF RANGE) EXISTS IN THE SYSTEM. INDEPENDENT VERIFICATION OF THE PROCESS VARIABLE
SHOULD BE DONE PRIOR TO MAINTENANCE ON THE SYSTEM IF “OFFSET” APPEARS ON THE PROCESS DISPLAY.
SPAN:
SPAN adjustment adjusts the high end of the range by ± 10% by changing the slope of the line while holding the zero point
fixed.
To calculate the SPAN value, apply a reference source below full scale to the Excela sensor. Record the value that shows on the
Excela display and the reference source value. Divide the reference source value by the display value and then multiply the
result by the sensor’s upper range value.
FORMULA: SPAN = reference source / display value x upper range value
• Pressure example: For a sensor range of 0 - 100 psi, choose a reference source (90) below the upper range limit (100) to
prevent an over range condition. Divide the reference source value from the resulting display value (88). Multiply the result
by the upper range limit. Span = 90 / 88 x 100 = 102 (rounded)
• Temperature example: For a sensor range of -40 to 450ºF, choose a reference source (400) below the upper range limit
(450) to prevent an over range condition. Divide the reference source value from the resulting display value (404). Multiply
the result by the upper range limit. Span = 400 / 404 x 450 = 446 (rounded)
LATCH MODE:
(Similar to Manual Reset on mechanical switch)
The switch output can be configured to latch when the setpoint is reached on rising set-point only.
• Set Latching Mode: In the Programming Mode, set “LCH1” to “ON”. When the set-point is crossed on increasing process
parameter, the switch will latch, and will remain in the latched state until it is manually reset by the user.
• To clear a Latched Output: First hit both buttons simultaneously, then “MAN RSET” will appear on the screen. To clear and
exit, press both buttons
og
PLUGGED PORT:
The Excela has the ability to monitor the sensor for changes over time, and can indicate that the process port has become
blocked, or plugged. The time and the pressure fluctuation is adjustable to match the application.
There are four possible settings for the detection time:
OFF
• 1 Min. • 1 Hr. • 24 Hrs.
When the feature is enabled, the user must then enter the plugged port range. The number is limited to +/- 10% of the full-
scale sensor range.
If the pressure does not vary more than the threshold value during the selected time, the unit goes into alarm mode.
Filter:
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 Filter feature provides a software digital filter with a programmable time constant
for suppressing certain transient short-duration events.
Selection for pressure models:
OFF
• 1/4 Sec.
• 1/2 Sec.
• 1 Sec.
• 2 Sec.
Selection for temperature models:
• 1/2 Sec.
• 1 Sec.
• 2 Sec.
DELAY:
The Trip Delay provides a configurable delay for switch trips with a range of up to 999.9 seconds.
To program the delay turn the feature on and then set the number of seconds for the delay.
If latch mode is activated, the Red LED will continue to flash even if the value drops below the Fall setting. Refer to Latch func-
tion on page 5 to clear a latched output.
NOTE:
Enabling the trip delay function would delay notification of a tripped process event. Select an appropriate time delay
that will still accommodate for sufficient response time to a tripped event.
