-14%

PT100 3-wire Platinum resistance temperature sensor probe

Original price was: ₨1,050.00.Current price is: ₨900.00.

20 Items sold in last 3 months

Delivery to Pakistan

Shipping via Leopards

1-3 Business Days (Normally)

Shipping calculated at checkout.

Delivery to US

Shipping via DHL, UPS, or FedEx.

3-12 Business Days (Normally)

Shipping calculated at checkout.

Payment Methods:

Overview

The PT100 3-wire sensor is a high-precision Platinum Resistance Temperature Detector (RTD) used widely in industrial and laboratory settings. It works on the principle that the electrical resistance of platinum increases predictably as the temperature rises.

Core Specifications:

Sensor Type: RTD (Resistance Temperature Detector).
Base Resistance: 100 $\Omega$ at 0°C.
Temperature Range: $-200\text{°C}$ to $+600\text{°C}$
Accuracy:±0.5°C Accuracy from -10°C to +85°C
Material: Platinum (Pt) is used for its excellent stability and repeatability.

Key Features:

High Accuracy: Significantly more precise and stable over time than thermocouples.
Linearity: Offers a very linear relationship between resistance and temperature, making it easier for controllers to process.

Detailed Description

The PT100 3-wire RTD (Resistance Temperature Detector) is the most common industrial temperature sensor. It is prized for its excellent stability, repeatability, and accuracy across a wide temperature range, typically from -200°C to +550°C.

1. Understanding the “PT100” Name

PT: Stands for Platinum, the material used for the sensing element due to its linear resistance-to-temperature relationship.
100: Indicates that the sensor has a nominal resistance of 100 $\Omega$ at 0°C.

2. Why Use 3 Wires?

In a standard 2-wire setup, the resistance of the lead wires themselves is added to the sensor’s reading, causing a “temperature offset” error. The 3-wire configuration solves this:

Wire 1 & 2: Connected to one side of the PT100 element.
Wire 3: Connected to the other side.
The Benefit: Industrial controllers (like the MAX31865) measure the resistance between the two common wires to calculate the lead resistance and then subtract it from the total measurement. This provides a much more accurate reading than a 2-wire sensor, especially when the probe is far from the controller.

3. Construction Details

A typical PT100 probe consists of several layers to ensure longevity in harsh environments:

The Tip: Contains the platinum resistor embedded in ceramic or glass.
The Filling: Packed with magnesium oxide (MgO) powder to provide high thermal conductivity and vibration resistance.
The Sheath: A protective metal tube.
The Transition: The point where the rigid probe meets the flexible lead wires, often reinforced with a spring or potting.
Lead Wires: Usually insulated with Teflon (PTFE), Fiberglass, or PVC depending on the environment’s heat.