The **WMS2-GA-R/K** is a specific technical configuration for a **Gas Actuated Thermometer**, typically used in industrial process control. While it is primarily a mechanical sensing device, the "electronic parts" refer to the integrated switching components used to trigger alarms or control systems based on temperature thresholds. --- ### 1. Component Breakdown The part number indicates a specific assembly involving gas expansion principles combined with electrical contacts. | Feature | Description | | :--- | :--- | | **Sensing Principle** | Inert Gas Expansion (Nitrogen-filled system). | | **Contact Type** | Magnetic Snap-Action Contacts (indicated by "WMS"). | | **Housing Material** | Stainless steel or aluminum, typically IP65 rated. | | **Mounting** | Back or bottom entry with capillary or rigid stem options. | --- ### 2. Electronic Switching System The "WMS" designation refers to the electrical contact assembly mounted behind the dial. This is the core electronic interface of the unit. #### Magnetic Snap-Action Contacts Unlike simple mechanical switches, these use a small permanent magnet to assist the closing/opening action. * **Purpose:** To prevent "arcing" or "chatter" when the temperature pointer moves slowly near the set point. * **Switching Capacity:** Usually supports up to **250V / 30VA** (AC/DC). * **Contact Arrangements:** * **K1:** Closes on rising temperature. * **K2:** Opens on rising temperature. --- ### 3. Internal Electrical Schematic The internal wiring typically follows standard industrial color coding or terminal numbering. ```mermaid graph LR A[Common Terminal 1] --- B((Contact Arm)) B -- "Temp Rise" --> C[Terminal 2 / NO] B -- "Temp Fall" --> D[Terminal 3 / NC] ``` #### Technical Specifications of Electronic Parts | Parameter | Typical Value | | :--- | :--- | | **Contact Material** | Silver-Nickel (AgNi) or Gold-plated (for low voltage). | | **Switching Current** | 0.6 A to 1.0 A (depending on voltage). | | **Ambient Temp Range** | -20°C to +70°C for the housing electronics. | | **Electrical Connection** | Terminal box or plug connector (M12 or DIN). | --- ### 4. How the Electronics Interact with the Mechanicals 1. **Sensing:** The bulb senses heat, causing the gas to expand through a Bourdon tube. 2. **Movement:** The tube uncoils, moving the mechanical pointer across the dial. 3. **Triggering:** When the pointer reaches the adjustable "set point" arm, it mechanically pushes the contact. 4. **Signal:** The magnetic snap-action contact closes the circuit, sending an electrical signal to a PLC, siren, or safety relay. --- ### 5. Application Usage * **Transformers:** Monitoring oil temperature and triggering cooling fans. * **Compressors:** High-temperature emergency shutdown. * **Chemical Processing:** Maintaining specific reaction temperatures via valve control.