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Model 8W2D
requires a 12-30 VDC @ 30 mA external power supply. Connect the leads from the
power supply to the + and - terminals on the back of the 8W display module, observing polarity.
Connect the 4-20 mA output available at TB1 to an appropriate analog input, observing polarity.
Connect the two potential-free solid-state relays at TB2 to appropriate loads. Refer to the Switch
Ratings Table for SW1 & SW2 ratings.
Switch Ratings Table
Model Number
SW1
SW2
2W2D00
12-30 VDC @ 40 mA
N/A
2W3A00
90-130 VAC/VDC @ 100 mA
N/A
2WLP41
0-140 VAC/VDC @ 0.6 A
1
N/A
2WLP43
0-280 VAC/VDC @ 0.3 A
1
N/A
4W3A01
24-280 VAC @ 10 A
2
N/A
8W2D42
75-250 VAC @ 1.5 A
3
75-250 VAC @ 1.5 A
3
8W2D44
75-250 VAC @ 1.5 A
3
0-140 VAC/VDC @ 0.6 A
1
8W2D45
0-140 VAC/VDC @ 0.6 A
1
0-140 VAC/VDC @ 0.6 A
1
Warning:
Exceeding the current or voltage ratings could damage the One Series
1
Derate at 8% per 10°C (18°F)
2
Derate at 1.8 A per 10°C (18°F) for temperature above 100°F (38°C)
3
Derate at 10% per 10°C (18°F) (Subject to change)
THEORY OF OPERATION
The One Series electronic switch product line is based on an all-solid-state electronic module that incorporates a microprocessor. The combination of features
such as no moving parts and IAW
®
self-diagnostics provide a highly reliable, accurate and repeatable monitor for detecting pressure and temperature thresholds
and, once reached, can make intelligent switch decisions based on retained settings and current conditions. Where a mechanical device has no way of determin-
ing its “readiness”, the One Series monitors its own health and reports it locally. This IAW
®
(I Am Working) feature provides a solution to the “blind device” issue
common with mechanical apparatus. You will always know the health status of the One Series.
The One Series is also very rugged, featuring a Enclosure Type 4X, weather-tight enclosure suitable for harsh environments and hazardous (Class I, Division 2)
locations. The 0.5% accuracy rating is maintained over a very wide -40°C - (+70°C) operating range using active temperature compensation. Repeatability
rivals that of a process transmitter, with a 0.1% of full range rating. The set point and deadband (hysteresis) of the switch is fully programmable over the entire
range of the sensor. Reaction time for the One Series to a process change is typically 50 mS or less.
2-WIRE SIMPLICITY
(2W Models only)
The One Series 2-Wire electronic pressure switch (patented) is designed to operate on discrete input leakage current (models 2W2D and 2W3A) or analog input
4-20 mA loop power (models 2WLP41 and 2WLP43). The microprocessor-based One Series 2-Wire is the only electronic switch to operate and switch over a
single pair of wires, similar to a traditional mechanical switch or 4-20 mA process transmitter. It combines the simplicity and low cost features of a switch and
the reliability features of a transmitter, at less than half the price of the transmitter, and without the need to pull additional wiring.
• Model 2W2D00 is designed to work with most 24 VDC discrete Programmable Logic Controller (PLC) or Distributed Control System (DCS) inputs and some
relays. When open, the switch draws 350 µA; when closed the switch sinks or sources 40 mA maximum @ 12-30 VDC.
• Model 2W3A00 is designed to work with most 115 VAC discrete PLC or DCS inputs and some relays. When open, the switch draws 1 mA; when closed, the
switch sinks or sources 100 mA maximum @ 90-130 VAC or VDC.
• Model 2WLP4x is loop-powered and operates in a transmitter loop attached to an analog PLC or DCS input and provides a field-scalable 4-20 mA signal over
a 2-wire connection. Model 2WLP41 contains an auxiliary solid-state relay switch rated for 0.6 A @ 140 VAC or VDC maximum and requires 2 additional
wires, if used. Model 2WLP43 is rated for 0.3 A @ 280 VAC or VDC.
DISPLAY
The One Series features a large, easy-to-read display, showing the process condition and the status of the instrument. (See Display Features for a complete
description.) Set point, deadband and minimum/maximum process values can be easily accessed from the front of the unit while in operation. Programming and
interrogating the One Series is done through two buttons on the faceplate.
HIGH-POWER AND DUAL SWITCHING
One Series model 4W3A incorporates a relay to provide a high-capacity switch rating of 280 VAC at up to 10 A. One Series model 8W2D provides 2 independent
relays (see table on page 5 for details) and includes a field-scalable 4-20 mA analog output that is proportional to the process variable. These One Series
Models require a separate power supply.
Содержание 2W2D
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