STA940

Honeywell STA940-E1G-00000-MB.SM.CO.E1D9-6138

Description:
The product is a Smart Absolute Pressure Transmitter from the Honeywell ST 3000 Series 900 (S900) family. The STA940 models are part of Honeywell’s proven smart pressure transmitters originally deployed as industrial process instruments with advanced diagnostics, high stability, and digital communication options.
This model is designed to measure absolute pressure (pressure relative to a vacuum) and provide a proportional electrical output (typically 4–20 mA with optional digital communications like HART) for integration into control systems such as DCS or PLC. 
The STA940 has been widely used in industrial process control, and in many cases units are now discontinued and supported via surplus or replacement programs.

Key Feature:
- Absolute pressure measurement (pressure relative to vacuum)
- Part of the Honeywell ST 3000 Series 900 smart transmitter platform
- Proven piezoresistive sensor technology for reliable, repeatable measurements
- Digital integration possible via HART or Digitally Enhanced (DE) protocol
- Strong long-term stability (typically ±0.01 % per year) and high reliability
- On-board advanced diagnostics for maintenance and process quality monitoring
- Designed for use across a wide spectrum of industrial environments including hazardous areas (when properly certified)

Specification:
- Pressure & Output
Model: Honeywell STA940-E1G-00000-MB.SM.CO.E1D9-6138
Transmitter Type: Absolute pressure transmitter (ST 3000 Series 900)
Measurement: Absolute pressure (pressure referenced to vacuum)
Supply 11-42 VDC
Output: 4–20 mA analog, with optional HART®/DE digital communication
Sensor Technology: Piezoresistive
Diagnostics: Built-in self-diagnostics and failure reporting

- Wetted Part:
Replacement body model: STA940V-A10-6038
Serial: 97097045366000101
Pressure Rating 750 PSIA
Pressure Limits 0-500 PSIA
Span Limits 5-500 PSIA
Fill: SIL
Head: SS
Diaph: SS

- Environment & Construction:
Operating Temperature: Typically industrial range (~−40 °C to +80 °C typical for ST3000 sensors)
Housing: Rugged industrial enclosure (often stainless steel wetted parts)
Mounting: Process connection and optional mounting bracket
Weight: Around 9 lbs (typical for STA940 transmitters)

Typical Application:
Industrial process pressure measurement (chemical, petrochemical, power)
Absolute pressure monitoring in vacuum or near-vacuum systems
Integration with DCS/PLC control systems via 4–20 mA and digital protocols
Boiler and steam system control where absolute pressure is needed
Gas and liquid phase process loops requiring precise absolute pressure feedback