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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.

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The product

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.


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

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.


  • Digital process and status display
  • Fully adjustable set point and deadband
  • Local and remote self-diagnostic reporting
  • Agency certifications for hazardous locations
    • cULus, IECEx, GOST, CE and ATEX
    • 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

Dual Seal Certified

  • ?cUL certified to ANSI/ISA 12.27.01
  • Complies with CEC rule 18-072 and NEC 501.17 requirements for providing a secondary seal between the process and electrical connections, and indication of primary seal failure should one occur
  • Decrease labor time and cost by eliminating externally connected secondary seals
  • Provides HART communication for all transmitter and switching functions. *Option M041 is Required.

HART® Protocol Resources

Product name: One Series 1XTXSW, One Series 1XTX00
Product Type: Pressure or Temperature Transmitter-Switch
HART Version: 7
Manufacturer ID: 6049
Device Type: E321 & E322
Device Revision: 2
Wireless product: No
Device Registered with HCF: Yes – Pending Registration
DD Registered with HCF: Yes – Pending Registration
DD Revision: 1
Enhanced DD: Yes

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