Product Overview




NEW! One Series Pressure and Temperature Transmitter-Switches Include HART® 7 Communication



Product Line Overview


Each One Series model incorporates intelligent self-diagnostics and can report detected faults before they become major safety issues. Plug Port Detection protects against sensor clogging. Nuisance trip filtering reduces false and spurious signals. The ability to capture pressure spikes and valleys provides process information to aid in the commissioning and debugging process.


Consider a highly repeatable and fully adjustable deadband switch for applications where high cycle rate is present. With no moving parts, the One Series digital solid-sate design is uniquely suited for controlling pump and compressor stop/start cycles. And with its digital process display and HART®- Enabled 4-20 mA output, the One Series can provide the functions of a switch, gauge and a transmitter with only one connection to the process


For plant upgrades, the One Series is the most cost-effective choice. 2-Wire models utilize existing plant wiring and control schemes.  Loop-powered hybrid transmitter models provide high-capacity switching and a 4-20 mA output. 4-wire models can handle currents up to 10 amperes at 240 VAC.


Adjustability, accuracy, versatility, intelligence – see what the One Series can do in your critical application.

One Series 1X

One Series 1X shown with gauge pressure sensor

One Series 1X shown with Differential Pressure Sensor

One Series 1X shown with Local RTD Temperature Sensor

Please refer to our One Series Bulletin for further specification information.



One Series 1X



Digital process and status display

Fully adjustable set point and deadband

Local and remote self-diagnostic reporting

Agency certifications for hazardous locations


Class I, Division 1 & 2 models available

Zones 0, 1 & 2

3 ways to power the control –

2-wire discrete input power

Loop-powered analog input

External power supply

2 ways to program the control –

Local keypad and display

Remote HART® communicator

Multiple sensor types and ranges –

Gage pressure from full vacuum up to 6000 psi (413,7 bar)

Differential pressure up to 200 psid (13,8 bar d)

RTD temperature from -300 to 1,000°F (-184 to 538°C)

3 models to choose from

2-wire low power single switch (only)

Loop-powered Hart Transmitter plus 2 solid-state relays

Loop-powered Hart Transmitter (only)



  • Liquid crystal display provides the process variable, self diagnostics information and alarm status
  • IAW™ (I Am Working) self-diagnostics constantly monitor the health status of the control to eliminate the “blind switch” issue
  • 2-Wire models drop in place of existing mechanical switches and use the same wiring and control schemes providing a cost-effective
  •   upgrade path
  • Loop-powered models provide a HART 4-20 mA transmitter output and include programmable solid-state relay (SSR) switches effectively replacing a transmitter, switch and a gauge
  • All transmitter and switch functions are programmable using a HART communicator or the keypad on the display
  • Two independent SSRs combine with a 4-20 mA output for stop/start, window mode and starting permissive applications
  • Solid-state design allows for switching in high cycle rate applications without degredation
  • Option M041 provides certified dual seal pressure sensor


One Series 1X shown with dual seal


One Series Hybrid Transmitter-Switches

The One Series electronic pressure and temperature transmitter-switches set the standard for smart digital process monitoring. With a fully adjustable set point and deadband and 0.1% repeatability, the One Series performs in a wide variety of applications. Available in Type 4X enclosures approved for intrinsic safety, flameproof and non-incendive area classifications, these hybrid transmitter-switches are designed to provide transmitter, switch and gauge functions all-in-one rugged enclosure that can withstand the rigors of harsh and hazardous environments.

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Tel:  (617) 926-1000

Fax: (617) 926-4354

Do you have a  customer service or technical question?  Please email us and we will get back to you.

180 Dexter Avenue, Watertown, MA  02472-4200