The **PT-10-R** is a specific series of 10mm potentiometer (variable resistor) manufactured by **Piher Sensing Systems**. It is designed for through-hole mounting on Printed Circuit Boards (PCBs) and is widely used in control panels and industrial electronics. --- ### ## Technical Specifications The PT-10-R is characterized by its carbon-track technology and open-frame design. | Feature | Specification | | :--- | :--- | | **Diameter** | 10 mm | | **Resistance Range** | 100$\Omega$ to 5M$\Omega$ | | **Tolerance** | $\pm$20% (Standard) / $\pm$10% (Optional) | | **Power Rating** | 0.15W at 50°C | | **Rotation Angle** | Mechanical: 235° $\pm$ 5° / Electrical: 220° $\pm$ 20° | | **Voltage Rating** | 200 VDC | | **Operating Temp** | -25°C to +70°C | --- ### ## Component Anatomy The PT-10-R consists of several key electronic and mechanical sub-parts: 1. **Resistive Element:** A carbon-based track deposited on a polyester or ceramic substrate. This determines the total resistance. 2. **Wiper (Contact):** A metal brush that moves along the resistive track. The position of the wiper relative to the terminals determines the output voltage/resistance. 3. **Housing:** Usually made of flame-retardant plastic (UL 94 V-0). 4. **Terminals:** Three pins (Lead-free) for PCB mounting. * *Outer Pins:* Connected to the ends of the resistive track. * *Center Pin:* Connected to the wiper. 5. **Rotor:** The internal part that holds the wiper and accepts the adjustment tool (screwdriver or thumbwheel). --- ### ## Deciphering the Part Number (Example) The "R" in PT-10-R usually denotes the **Layout/Mounting style**. Here is a breakdown of common coding: * **PT-10:** Series name (10mm Carbon Potentiometer). * **H / V / R:** Orientation. * **H:** Horizontal mount (adjustment from the top). * **V:** Vertical mount (adjustment from the side). * **R:** Specific lead spacing/pitch configuration (often a variation of vertical mounting). * **Value:** Indicated by codes like `103` ($10 \times 10^3 = 10k\Omega$). --- ### ## Key Features * **Dust Proof:** The "PT" series usually features an enclosed design that protects the resistive track from environmental contaminants. * **Customization:** Available in "Linear" (A), "Logarithmic" (B), or "Antilog" (C) tapers. * **Long Life:** Rated for up to 1,000 to 10,000 cycles depending on the specific sub-model.