The **WRPP-CMK-R/Q** is a specific industrial-grade **Thermocouple Temperature Sensor** assembly. While the exact naming convention may vary slightly by manufacturer (often associated with brands like Shanghai Automation or similar industrial instrumentation firms), the designation breaks down into specific electronic and physical components. --- ## 1. Technical Specification Table | Feature | Specification | | :--- | :--- | | **Thermocouple Type** | S-Type (Platinum Rhodium 10-Platinum) | | **Standard Grade** | Class I or Class II | | **Operating Range** | 0°C to 1300°C (Long term), 0°C to 1600°C (Short term) | | **Output Signal** | Millivolt (mV) Analog signal | | **Junction Type** | Ungrounded (typically) for R/Q variants | | **Protection Tube** | Corundum (Alumina) Ceramic | --- ## 2. Electronic Component Breakdown ### A. The Thermocouple Element (S-Type) The core "electronic" part is the pair of dissimilar metal wires. The **WRPP** designation indicates an **S-Type** thermocouple. * **Positive Leg:** Platinum (90%) and Rhodium (10%). * **Negative Leg:** Pure Platinum. * **Function:** It operates on the *Seebeck Effect*. When there is a temperature gradient between the hot junction (tip) and the cold junction (terminals), it generates a micro-voltage (mV) proportional to the temperature. ### B. The Connection Head (R/Q Types) The "R" and "Q" suffixes usually refer to the housing or the specific junction box configuration: * **Terminal Block:** Located inside the head, usually made of high-temperature ceramic with brass or stainless steel screw terminals. * **Signal Transmission:** It translates the internal wire contact to external lead wires. In the **R/Q** series, these heads are often designed to be waterproof or explosion-proof (depending on the specific sub-rating). ### C. Compensation Wires Because S-type thermocouples use precious metals (Platinum), the electronic circuit requires specific **Compensation Wires** (usually Type SC) to connect the sensor head to the controller. Using standard copper wire would introduce "cold junction" errors. --- ## 3. Structural Components While not strictly "electronic," these parts protect the electronic signal integrity: 1. **Corundum Protection Tube:** Prevents the Platinum wires from chemical "poisoning" or oxidation at high temperatures (up to 1600°C). 2. **Insulating Sleeves:** Small ceramic beads that keep the two thermocouple wires from touching each other (which would cause a short circuit and false reading) before they reach the hot junction. --- ## 4. Signal Characteristics The electronic output of the WRPP-CMK-R/Q is extremely low-level: * **At 1000°C:** The output is approximately **9.587 mV**. * **Requirement:** This requires a high-impedance PID controller or a temperature transmitter to convert the mV signal into a 4-20mA or digital signal. ---