RT-939N Thermocouple Thermometer

A. Product Overview

The R-Tek RT-939 Digital Probe Thermometer is designed for accurate contact temperature measurement over a wide temperature range. It supports both K-type and J-type thermocouples, making it suitable for applications where different probes are required for temperature monitoring and testing.

The large backlit display can show different temperature combinations, including T1, T2, T3, T4, T1 minus T2, T1 minus T4 and T2 minus T3. It also provides MAX, MIN and AVG recording for easier analysis of changing temperature conditions.

Key Features

• Compatible with K-type and J-type thermocouples
• Fast response temperature measurement
• High accuracy measurement
• 0.1°C or °F resolution
• Large backlit display
• Multiple temperature channel display
• MAX, MIN and AVG recording
• Electronic offset compensation
• Temperature display in °C, °F or Kelvin
• USB interface
• Memory for at least 40,000 readings per channel
• Auto power off for battery saving

Key Specifications

The temperature ranges and operating specifications above are taken from the manufacturer's RT-939 product page.

B. Working Principle

The RT-939 Thermocouple Thermometer works by using an external K-type or J-type thermocouple probe as its temperature sensing element.

When the thermocouple probe comes into contact with the object, surface or process being measured, the thermocouple generates a small electrical signal related to the temperature difference. The RT-939 processes this signal and converts it into a digital temperature reading.

The basic working sequence is:

Thermocouple probe contacts measurement point → Thermocouple generates electrical signal → RT-939 processes the signal → Temperature is displayed digitally

The meter also provides an electronic offset function, which allows compensation for thermocouple errors to improve the overall accuracy of the measurement system.

Multiple inputs can also be compared, allowing temperature differences such as T1 minus T2 to be monitored directly.

C. Why Is the R-Tek RT-939 Used?

The RT-939 is used when accurate contact temperature measurement is required over a wide temperature range.

It can help users with:

• Contact temperature measurement
• High temperature measurement
• Low temperature measurement
• Comparing temperatures at different points
• Monitoring temperature variation
• Recording maximum temperature
• Recording minimum temperature
• Calculating average temperature
• Multi-point temperature monitoring
• Recording temperature readings for later analysis
• Transferring measurement data through USB
• Compensating for thermocouple measurement errors

Its wide thermocouple ranges make it useful when ordinary digital thermometers do not provide sufficient measuring capability. The K-type range extends from -200°C to 1372°C, while the J-type range extends from -210°C to 1100°C.

D. Suitable Buyers

Based on its thermocouple compatibility, wide measurement range, multi-channel capability and data recording features, the RT-939 can be suitable for:

• Industrial maintenance departments
• HVAC technicians
• Electrical maintenance professionals
• Mechanical maintenance engineers
• Manufacturing plants
• Quality control departments
• Research laboratories
• Testing laboratories
• Process industries
• Furnace and heating equipment technicians
• Refrigeration professionals
• Food processing facilities
• Temperature calibration professionals
• Equipment service companies
• Engineering colleges and training laboratories

These applications are practical use cases based on the instrument's temperature measurement capabilities rather than specific industries listed by R-Tek.

Frequently Asked Questions

1. What is the R-Tek RT-939?

The R-Tek RT-939 is a digital contact thermometer designed for accurate temperature measurement using K-type and J-type thermocouples.

2. Which thermocouples are compatible with the RT-939?

The RT-939 supports K-type and J-type thermocouples.

3. What is the K-type temperature range of the RT-939?

The specified K-type temperature measuring range is approximately -200°C to 1372°C.

4. What is the J-type temperature range?

The specified J-type temperature range is approximately -210°C to 1100°C.

5. What is the resolution of the RT-939?

The meter provides a resolution of 0.1°C or °F.

6. Can the RT-939 display temperature in Celsius and Fahrenheit?

Yes. The instrument supports readings in Celsius, Fahrenheit and Kelvin.

7. Does the RT-939 support multiple temperature inputs?

Yes. The product page lists multiple temperature channels such as T1, T2, T3 and T4, along with temperature difference combinations including T1 minus T2.

8. Does the RT-939 have MAX and MIN functions?

Yes. It provides MAX, MIN and AVG recording functions for monitoring temperature variations.

9. Does the RT-939 have data storage?

Yes. R-Tek specifies memory for at least 40,000 readings per channel.

10. Does the RT-939 have a USB interface?

Yes. A USB interface is included for connectivity and measurement data handling.

11. What is electronic offset compensation?

Electronic offset allows the user to compensate for errors introduced by the thermocouple, helping improve the overall accuracy of the temperature measurement system.

12. Is the RT-939 suitable for industrial temperature measurement?

Yes. Its wide temperature range, thermocouple compatibility, multi-channel measurement, data storage and USB interface make it suitable for many industrial temperature monitoring and testing applications.

13. Can the RT-939 compare two temperature points?

Yes. The meter supports temperature difference displays such as T1 minus T2, allowing two measurement points to be compared directly.

14. Does the RT-939 have automatic power off?

Yes. The meter includes an auto power off mode designed to conserve battery life.