High Temperature (Ambient to 600oC)

Two Probe Method For Resistivity Measurement of Near Insulators at Different Temperatures (Ambient to 600oC)

Description

Behaviour of resistivity of substarte such as polymer sheets/ films at higher temperatures is an important area of investigation due to their variety of applications. Two Probe Method is one of the standard and most commonly used method for the measurement of resistivity of very high resistivity samples like sheets/films of polymers. The resistivity measurement of such samples is beyond the range of Four Probe Method.

Description of the experimental setup

1. Two Probes Arrangement
It has two individually spring loaded probes. The probes arrangement is mounted in a suitable stand of high quality alumina which also holds the sample plate. To ensure the correct measurement of sample temperature, the thermocouple junction is embedded in the sample plate just below the sample. This stand also serves as the lid of temperature controlled oven. Proper leads are provided for connection to Capacitance Meter and Temperature Controller.

2. High Temperature Oven
This is a high quality temperature controlled oven. The heating element used is a high grade Kanthal- D. It is mounted on a custom made groved, sintered alumina fixture to avoid any slippage of heating wire. Heat shield is also provided to reduce the excessive heating of outer cover. Further the top portion is also suitably covered to meet the safety standard. The oven has been designed for fast heating and cooling rates, which enhances the effectiveness of the controller.

3. PID Temperature Controller
It is a high quality PID controller where the temperatures can be set and controlled easily. P, I and D can be adjusted by the user and can also be kept on Auto-tuning.

Specification

Temperature Range

Ambient to 600°C

Power Supply

100-240VAC; 50/60Hz

Display Method

7 Segment LED display  [Processing value (PV):Red, Setting value (SV):Green]

Input Sensor

Thermocouple (Chromel – Alumel)

Control Method

PID, ON/OFF Control, P, PI, PD, PIDF, PIDS

Display Accuracy

± 0.3%

Setting Type

Setting by front push buttons

Proportional Band (P)

0 to 100.0%

Integral Time (I)

0 to 3600 Sec

Derivative Time (D)

0 to 3600 Sec

Control Time (T)

1 to 120 Sec

Sampling Time

0.5 Sec

Setting (P, I & D)

Manual / Auto

4.  High Voltage Power Supply, Model : EHT-11

5.  Digital Picoammeter, Model : DPM-111

The experimental set-up is complete in all respect

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