Description
Core Product Summary
The Foxboro E69F-BI2 is a field-mounted current-to-pneumatic signal converter. It accepts a DC milliamp control signal and produces a proportional pneumatic output for control valves, dampers, actuators, and other pneumatic instruments.
The E69F-BI2 configuration uses a bolted-cover weatherproof enclosure for non-explosionproof applications, a 4–20 mA DC input with 170 Ω input impedance, and a 20–100 kPa / 3–15 psi / 0.2–1.0 bar pneumatic output range. It can be mounted on a surface, valve yoke, or nominal DN 50 / 2 in vertical pipe.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Foxboro |
| Model | E69F-BI2 |
| Product type | Field-mounted current-to-pneumatic signal converter |
| Converter family | Foxboro E69F |
| Input signal | 4–20 mA DC |
| Input impedance | 170 Ω |
| Input action | Direct or reverse action |
| Pneumatic output | 20–100 kPa / 3–15 psi / 0.2–1.0 bar or kg/cm² |
| Enclosure option | B, bolted-cover weatherproof enclosure |
| Intended installation area | Non-explosionproof applications |
| Mounting options | Surface, valve yoke, or DN 50 / 2 in vertical pipe |
| Dimensions | 20 × 20 × 5 cm |
| Weight | 0.58 kg |
| Compliance marking | CE |
The E69F-BI2 identification combines the E69F converter model, I input option, B weatherproof bolted-cover enclosure, and 2 pneumatic-output range.
Engineering Selection Highlights
- 4–20 mA DC input with 170 Ω impedance → the control-system output must be capable of driving the converter input loop.
- 20–100 kPa / 3–15 psi output → the pneumatic actuator or instrument must accept this standard pressure range.
- Direct or reverse action → the converter must be configured to match the required control-valve fail-safe and signal-direction logic.
- B bolted-cover weatherproof enclosure → the model is intended for non-explosionproof installations; hazardous-area use requires a separately certified configuration.
- Surface, valve-yoke, or 2 in pipe mounting → the mechanical installation can be located close to the controlled valve or on a nearby pipe support.
- Galvanometric motor design → the converter mechanism is designed with clearances that reduce the effect of atmospheric corrosion and dust on operation.
- CE marking → the converter is identified as conforming to applicable European Union directives.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Electrical input | 4–20 mA DC control signal, 170 Ω input impedance | The controller or DCS output loop must supply the required milliamp signal. |
| Pneumatic output | 20–100 kPa / 3–15 psi / 0.2–1.0 bar | The connected valve positioner, actuator, or pneumatic device must accept this output range. |
| Control action | Direct or reverse action | Select and configure the action to match the valve’s required response to an increasing input signal. |
| Enclosure environment | Weatherproof, non-explosionproof application | The B enclosure option is documented for non-explosionproof use. |
| Mounting | Surface, valve yoke, or DN 50 / 2 in vertical pipe | Choose the mounting arrangement that keeps pneumatic tubing runs practical and protects the converter. |
The E69F-BI2 is specifically documented as a field-mounted converter for pneumatic instruments and control valves, with the B enclosure intended for non-explosionproof applications.
E69F-BI2
E69F-BI2
Detailed Product Overview
The Foxboro E69F-BI2 is a field-mounted current-to-pneumatic converter in the E69F family. Its function is to convert a DC milliamp control signal into a proportional pneumatic pressure output. This makes it an interface device between electronic process control and pneumatic final-control elements such as valves, dampers, and actuators.
The BI2 designation defines the converter’s principal configuration. The I input option accepts 4–20 mA DC, with an input impedance of 170 Ω and support for direct or reverse action. The B enclosure option is a bolted-cover weatherproof design intended for non-explosionproof applications. The 2 output option provides 20–100 kPa, 3–15 psi, or 0.2–1.0 bar / kg/cm² pneumatic output.
The input signal determines the pneumatic output within the selected range. In direct action, an increasing milliamp input produces an increasing pneumatic output; in reverse action, the relationship is inverted. This action must match the control-valve arrangement and the required process response, particularly where fail-safe behavior depends on the direction of the control signal.
The converter is designed for field installation near the controlled device. It can be mounted on a surface, a valve yoke, or a nominal DN 50 / 2 in vertical pipe. Its compact dimensions of 20 × 20 × 5 cm and 0.58 kg weight support installation close to the valve, reducing pneumatic tubing length and keeping the converter accessible for service.
The E69F uses a galvanometric motor mechanism. The design provides generous clearance between the coil and housing, and the manufacturer describes the mechanism as unaffected by normal atmospheric changes that may introduce corrosion or dust. This is a design characteristic of the converter mechanism, not a claim of suitability for every environmental condition.
Dimensions, Mounting & Connection Notes
| Item | Installation Data |
|---|---|
| Dimensions | 20 × 20 × 5 cm |
| Weight | 0.58 kg |
| Mounting options | Surface, valve yoke, or DN 50 / 2 in vertical pipe |
| Enclosure | B, bolted-cover weatherproof enclosure |
| Electrical interface | 4–20 mA DC input |
| Pneumatic interface | Proportional 20–100 kPa / 3–15 psi output |
The converter is a compact field-mounted unit that can be installed directly at the valve, on a nearby surface, or on a vertical pipe. Its electrical and pneumatic interfaces are designed for straightforward connection to the control loop and pneumatic device.
Applications & System Role
The E69F-BI2 sits between the electronic control system and the pneumatic actuation layer of a process-control loop. The controller or DCS provides a 4–20 mA DC command, and the converter translates that signal into a proportional air-pressure output used by a control valve, damper, actuator, or other pneumatic device.
A technical-fit scenario is a non-hazardous process area where a pneumatic control valve requires a standard 3–15 psi actuation signal but the control system provides a 4–20 mA DC output. The E69F-BI2 provides the electrical-to-pneumatic interface at or near the valve.
FAQ
What is the Foxboro E69F-BI2?
The Foxboro E69F-BI2 is a field-mounted current-to-pneumatic signal converter that converts a 4–20 mA DC control signal into a proportional pneumatic output.
What input signal does it accept?
It accepts 4–20 mA DC with a 170 Ω input impedance. Direct or reverse action is supported.
What pneumatic output does it provide?
The 2 output option provides 20–100 kPa, 3–15 psi, or 0.2–1.0 bar / kg/cm².
What does the B enclosure option mean?
The B option is a bolted-cover weatherproof enclosure intended for non-explosionproof applications.
Where can the E69F-BI2 be mounted?
It can be mounted on a surface, a valve yoke, or a nominal DN 50 / 2 in vertical pipe.
What devices can it control?
It can provide a pneumatic signal to control valves, dampers, actuators, and other pneumatic instruments.
How large is the converter?
The documented dimensions are 20 × 20 × 5 cm, and the weight is 0.58 kg.
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