Description
Fisher 38B5786X132 DVC6200 Relay Assembly
Product Overview
The Fisher 38B5786X132 is a replacement relay assembly used inside the FIELDVUE DVC6200 and DVC6205 digital valve controller family. Emerson’s parts documentation identifies this exact part number as the standard-bleed, single-acting direct relay (Relay C) for Housing B, with Housing B intended for actuators other than the GX actuator.
That distinction is important during procurement. The Fisher 38B5786X132 is not a complete digital valve controller. It is one pneumatic subassembly within the DVC6200/DVC6205 architecture. The controller also contains an I/P converter, terminal assemblies, feedback components, electronics, seals, and other mechanical parts. Emerson lists the relay separately from the I/P converter in its service-parts documentation.
In practical operation, the relay forms part of the pneumatic interface between the DVC6200’s control electronics and the valve actuator. The correct relay configuration determines how the controller supplies and exhausts pneumatic pressure for the actuator. A single-acting direct arrangement therefore cannot simply be substituted with a reverse-action or double-acting relay because the physical fit may look similar while the actuator response is different.
The Fisher 38B5786X132 is particularly relevant when repairing an installed DVC6200 rather than replacing the complete positioner. Emerson’s parts table distinguishes several relay variants by bleed arrangement, housing, actuator type, and action. That makes the full part number more important than the general description “DVC6200 relay.”
Product Introduction
A relay replacement is a pneumatic configuration issue, not simply a spare-parts swap. 38B5786X132 is specifically the single-acting direct Relay C, standard-bleed configuration for Housing B. Selecting a different relay because it belongs to the same family can reverse actuator behavior or produce an incorrect pneumatic response.
For a maintenance repair or legacy valve-positioner replacement, compare the old relay marking, actuator type, housing arrangement, bleed configuration, and action before installation. Emerson’s parts documentation provides the necessary cross-reference between these configurations.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Model | 38B5786X132 |
| Manufacturer | Fisher / Emerson |
| Equipment Family | FIELDVUE / DVC6205 |
| Product Type | Pneumatic relay assembly |
| Relay Type | Relay C |
| Actuator Action | Single-acting direct |
| Bleed Configuration | Standard bleed |
| Housing | Housing B |
| Housing Application | Actuators other than GX |
| Installation Location | Inside /DVC6205 controller assembly |
| Complete Positioner Included | No |
| I/P Converter Included | No |
| Application | Pneumatic valve-actuator control |
| Service Role | Replacement/internal maintenance component |
The relay identification and configuration are taken directly from Emerson/Fisher parts documentation. Public documentation does not establish independent electrical ratings, firmware, communication protocol, operating temperature, or IP rating for 38B5786X132 itself because those characteristics belong primarily to the complete assembly rather than this pneumatic relay.
38B5786X132 DVC6200
Major Features / Practical Advantages
Exact Relay Configuration
The most important feature of 38B5786X132 is its configuration specificity. Emerson identifies it as a single-acting direct Relay C using the standard-bleed arrangement. It is assigned to Housing B, which the manual describes as the housing used for actuators other than the GX actuator.
This is more useful procurement information than simply describing the component as a ” relay.” The action and housing determine whether the replacement is appropriate for the installed pneumatic circuit.
Standard-Bleed Arrangement
The part belongs to the standard-bleed relay group. Emerson separately lists low-bleed relay variants, including 38B5786X152 for single-acting direct service in Housing B. That means 38B5786X132 and 38B5786X152 should not be treated as interchangeable merely because both are single-acting direct relays.
Bleed configuration can affect pneumatic behavior and air consumption, so the original configuration should be retained unless an approved engineering change specifies otherwise.
Single-Acting Direct Operation
The 38B5786X132 configuration is intended for a single-acting direct actuator arrangement. Emerson lists different part numbers for single-acting reverse and double-acting configurations:
- 38B5786X132 — single-acting direct, Relay C
- 38B5786X092 — single-acting reverse, Relay B
- 38B5786X052 — double-acting, Relay A
These distinctions are explicitly shown in the parts table.
Internal Service Component
The relay is supplied as a service-level component rather than a complete positioner. Emerson identifies the relay as a separate assembly and separately identifies the I/P converter, O-rings, shroud, terminal box, and other components.
For maintenance departments, this means the part can be relevant when the electronics and feedback system remain serviceable but the pneumatic relay requires replacement.
Applicable to and DVC6205
Emerson’s parts documentation lists the relay assembly under both . Compatibility with the controller family does not, by itself, establish compatibility with every actuator configuration. The Housing B and action requirements still need to match.
No Firmware or Software Dependency at the Relay Level
The relay itself is a pneumatic/mechanical assembly. Firmware, HART communication, calibration data, travel characterization, and controller configuration belong to the complete FIELDVUE positioner rather than the 38B5786X132 relay.
That makes this component fundamentally different from replacing the electronics module. A relay replacement should still be followed by appropriate pneumatic and valve-position verification.
Related Products
- — FIELDVUE digital valve controller for precise pneumatic control-valve positioning and diagnostics.
- DVC6205 — FIELDVUE remote-mounted digital valve controller used with compatible valve/actuator installations.
- 38B5786X092 — Standard-bleed, single-acting reverse Relay B for Housing B; different actuator action.
- 38B5786X052 — Standard-bleed, double-acting Relay A for Housing B.
- 38B5786X152 — Low-bleed, single-acting direct Relay C for Housing B.
- 38B5786X182 — Standard-bleed, single-acting direct Relay C for Housing A/GX actuator applications.
- 38B5786X172 — Standard-bleed, single-acting reverse Relay B for Housing A/GX actuator applications.
- 38B5786X202 — Low-bleed, single-acting direct Relay C for Housing A/GX actuator applications.
- 38B5786X192 — Low-bleed, single-acting reverse Relay B for Housing A/GX actuator applications.
- 38B5786X072 — Low-bleed, double-acting Relay A for Housing B.
Emerson’s parts documentation provides these variants as separate configurations, so the suffix is not cosmetic.
FAQ
What is Fisher 38B5786X132?
It is a Relay Assembly for the FIELDVUE /, specifically the standard-bleed, single-acting direct configuration using Relay C and Housing B.
Is 38B5786X132 the complete positioner?
No. It is an internal pneumatic relay assembly. The complete contains electronics, I/P conversion, feedback components, terminal assemblies, and other mechanical parts.
What does “single-acting direct” mean?
It describes the pneumatic/action configuration of the relay and actuator. The relay is intended for a single-acting actuator arrangement where the direct-action configuration is required. It should not be confused with the single-acting reverse Relay B configuration.
Can I replace 38B5786X132 with 38B5786X092?
Not as a general substitution. Both are Housing B, standard-bleed relay configurations, but 38B5786X132 is single-acting direct/Relay C, while 38B5786X092 is single-acting reverse/Relay B. The actuator action and valve-control behavior therefore differ.
Can I use 38B5786X152 instead?
It should not be treated as an automatic replacement. 38B5786X152 is also single-acting direct for Housing B, but it is the low-bleed version rather than the standard-bleed configuration of 38B5786X132.
Does 38B5786X132 contain the I/P converter?
No. Emerson lists the I/P converter assembly separately from the relay assembly. The I/P converter is identified separately in the parts documentation.
Can I hot-swap the relay?
No hot-swap assumption should be made. The relay is an internal pneumatic component of a valve positioner connected to an energized control loop and pressurized actuator. Isolate the instrument air supply, follow the plant valve-maintenance procedure, and verify the valve’s fail action before opening the positioner.
Does 38B5786X132 have firmware?
No firmware is associated with the relay assembly itself. Firmware and configuration belong to the / electronic controller. Replacing the relay does not constitute an electronic controller replacement, but valve travel and pneumatic operation should still be checked afterward.
What should I verify before purchasing?
Verify all of the following:
- Exact part number 38B5786X132.
- or controller model.
- Housing B configuration.
- Single-acting actuator.
- Direct action / Relay C arrangement.
- Standard-bleed requirement.
- Physical relay and port configuration.
- Condition of seals and mating pneumatic surfaces.
For used or New Surplus stock, a clean appearance is not enough. The relay should be inspected for contamination, damaged sealing surfaces, corrosion, blocked pneumatic passages, and evidence of improper disassembly.
Procurement Note
The Fisher 38B5786X132 is a small but configuration-critical service component. The primary procurement risk is not finding a part with the same ” relay” description; it is receiving a relay with the wrong action, bleed arrangement, or housing configuration.
The correct identification is:
38B5786X132 → Standard Bleed → Housing B → Single-Acting Direct → Relay C.
That configuration should be preserved when repairing an installed unless the valve/actuator engineering documentation explicitly specifies a different arrangement. Emerson’s official parts documentation should be treated as the controlling reference for final interchangeability decisions.
