IM_1XSW-02
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CONTINUOUS OPERATION SHOULD NOT EXCEED THE DESIGNATED OVER RANGE PRESSURE OR WORKING PRESSURE RANGE STATED WITHIN
THE LITERATURE AND ON DEVICE NAMEPLATE.
Over Range Pressure: The maximum pressure to which a pressure sensor may be continuously subjected without cause damage and maintaining
set point repeatability.
Max Working Pressure: The maximum that can be applied to both process ports simultaneously without affecting sensor performance.
The One Series electronic switch product line is based on an all-solid-state electronic module that incorporates a microprocessor. The com-
bination of features like no moving parts and IAW™ self-diagnostics provide a highly reliable, accurate and repeatable monitor for detecting
pressure and temperature thresholds which once reached, can make intelligent switch decisions based opon retained settings and current
conditions. The One Series monitors its own health and reports the status locally through the IAW™ (I Am Working) feature that provides a
solution to the “blind device” issue common with mechanical switches. You will always know the health status of the One Series.
The One Series is also very rugged, featuring a Type 4X, weather-tight enclosure suitable for harsh environments and hazardous (Class I,
Division 1) locations. The 0.5% accuracy rating is maintained over a very wide -40
°
C to +70
°
C operating range using active temperature
compensation. Repeatability is 0.1% of full range while the switch set point and deadband (hysteresis) is fully programmable over the entire
range of the sensor. Reaction time for the One Series to a process change is typically 100 mS or less.
2-WIRE SIMPLICITY (MODEL 1XSWLL AND 1XSWHL)
The One Series 2-Wire electronic switch is designed to operate on discrete input leakage current. The microprocessor-based One Series is the
only switch to operate and switch over a single pair of wires, similar to a traditional mechanical switch. It combines the simplicity and low cost
features of a switch and the reliability features found in a transmitter and without the need to provide additional wiring.
• Models 1XSWLL and 1XSWHL are designed to work with most Programmable Logic Controller (PLC) or Distributed Control System (DCS)
discrete inputs and some interposing relays. When open, the switch draws 750 µA (max); when closed, the switch sinks or sources 0.1
A maximum.
I Am Working (IAW™)
The One Series also contains UE’s patented IAW™ self-diagnostic software. On a continuous basis, the IAW™ algorithm checks for proper opera-
tion, and locally reports the status using messages or revolving arrows on the display. For remote reporting, a discrete IAW™ Output signal can
be monitored by the control system and used to detect normal, tripped, and fault conditions. IAW™ self-monitors, searching for possible faults, both
within the instrument and in the overall system (see Fault Codes, table 4, page 16). In the event of a detected fault, the One Series will attempt to
display the fault details and provide remote electrical indication by opening (turning off) the IAW™ Output. In the case of certain micro-controller
faults, the revolving arrow may freeze or go out; indicating locally that a failure exists.
DISPLAY FEATURES AND DIAGNOSTICS
The One Series features a large, easy to read LCD display (see Figure 1). It is used for three main purposes: process indication, programming of
key features and switch status/troubleshooting.
In the Process Display mode, the display may be indicating the following:
• Current process value and units of measure: A value will be displayed as long as the reading is within 110% of the full
scale range noted on the nameplate.
• I Am Working (IAW
™
) status: When the unit is working properly, a circular 4-segment arrow will be revolving around the letters “IAW” in the
top center of the display.
• Offset/Span Adjustment: The word “offset” will appear above the process value, indicating that the factory offset and/or span
calibration has been modified by the user.
In addition, the user can easily access information such as the set point, deadband and minimum/maximum process readings:
By pushing the right
g
button once, the display will scroll as follows:
SP1 XX.XX DB1 XX.XX
By pushing the left
2
button once, the display will scroll the min/max process values recorded in memory:
MAX XX.XX MIN XX.XX
The display will automatically revert back to the Process Display mode after scrolling
.
ALARM CONDITION
When the process goes beyond the set point, the display will begin to flash, alternating between the process value and “SW1”. The display will
continue to flash until the process has returned to a value beyond the deadband, at which point the display will revert to normal operation and
process value display. If the unit was programmed to have a latching output, a small “Latch” icon will light in the display when the set point is
reached, indicating that the output is latched and needs to be manually reset.
Figure 1
