One Series, 2-Wire Electronic Pressure & Temperature Switches

Clark Solutions
One Series, 2-Wire Electronic Pressure & Temperature Switches
E F.S. Ranges 5 to 4500 PSI, -50 to 450°F, 100% F.S. Deadband & Set Point Adjustment

(Page 2 of 6)

Page

APPLICATIONS
In the past, there were two choices for alarm and/or shutdown applications: an electro-mechanical switch, or a transmitter. The switch had the advantages of low cost and simple operation. The transmitter was higher cost, but offered diagnostic information through its “live zero” and perceived higher reliability. The customer had to choose.

Then came the One Series, a family of rugged electronic switches with the combination of low cost, reliability and diagnostics. It was the cost-effective answer for many applications which required the combination of “switch” function and “health” information. It has achieved widespread usage in the process and energy industries. However, for some applications, with mechanical switch wiring already in place, it was challenging to accommodate the additional third wire required to power the One Series.

The One Series 2-Wire is the next evolutionary stage in the One Series revolution.

REPLACING MECHANICAL SWITCHES
By utilizing residual current from the host, the One Series 2-Wire can provide digital switching on a single pair of wires. This allows the user to retrofit existing mechanical switches with no wiring changes, as long as the circuit is low power discrete input (such as a PLC or DCS input).

REPLACING TRANSMITTERS
The One Series 2-Wire versatility also makes it the ideal solution for alarm and shutdown applications previously accomplished by transmitters. Typically, transmitters are used in switching applications when a “live-zero” is desired- to confirm that the device is working. However, transmitters have two weaknesses - they are typically slow-reacting to process changes, and they are expensive. The One Series 2-Wire provides the IAW® diagnostics for similar peace-of-mind to the transmitter’s 4-20 signal, but is typically much faster-responding to process upsets, and can use less-expensive digital channels, reducing cost. The $1200 installed cost of a transmitter can be reduced by $600 to $800 per unit!

Applications include pressure and temperature measurements for rotating equipment protection, process line and tank monitoring, and boiler/burner alarms. With adjustable deadband from 0-100% of range, the One Series 2-Wire is the perfect solution to operate and protect pumps! The One Series is field-proven in many process industries including chemical, food, pharmaceutical, energy, wastewater and refinery applications.

Page

For assistance call 978-568-3400