Siemens SITRANS TH100 Temperature Transmitter PT100 Input, 8.5 → 36 V dc

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Siemens SITRANS TH200 Temperature Transmitter PT100 Input, 11 → 35 V dc

Siemens SITRANS TH300 Temperature Transmitter PT100 Input, 11 → 35 V dc


Temperature transmitters serve as a crucial interface between a control device and a temperature sensor These electrical instruments connect seamlessly with temperature gauges, ensuring accurate signal transmission. Essentially, a temperature transmitter converts the signals produced by temperature sensors into standard instrumentation formats.

This process not only measures the temperature but also allows for effective control of the process variable temperature. By doing so, temperature transmitters play a vital role in maintaining optimal conditions in various industrial and commercial applications.

## **How Does a Temperature Transmitter Work?**

Temperature transmitters take the temperature reading from a sensor and convert it into a standardised output signal. These signals, which usually range from 4-20mA, are then sent over to a controller, which will determine the next line of action. Controllers can be either DCS or PLC. These controllers are used to monitor and control industrial processes, using the temperature data received from the transmitter to make decisions and adjust process parameters accordingly.

## **Temperature Transmitter Types**

Temperature transmitters come in various types, each designed for specific temperature-sensing technologies and applications. Here are some common types:

### **RTD Transmitter**

An RTD transmitter is designed to work with Resistance Temperature Detectors (RTDs). RTDs are temperature sensors that exhibit a change in electrical resistance with temperature. The RTD transmitter measures this resistance change at its input and converts it into a standardised output signal, such as 4-20mA. RTD transmitters are known for their accuracy and stability over a wide temperature range.

RTD transmitters have the following features:

- High accuracy and stability
- Wide temperature range
- Linear output
- Good long-term stability
- Suitable for industrial environments

### **PT100 Transmitter**

PT100 transmitters (sometimes referred to as PT100 thermocouples or PT100 thermistors) are commonly used in the process industry. They are a form of RTD transmitter and typically have a resistance level of around 320F (100 ohms at 0°C). Whenever the temperature is higher, its resistance is going to be dependent on the particular sensor version.

PT100 transmitters have the following features:

- EAC Approval
- Tested vibration
- LED indication (over range)
- Compatible or ideal for PT100 sensors
- Programmable temperature range

### **Thermocouple Transmitter**

A thermocouple transmitter is designed to work with [thermocouples](https://au.rs-online.com/web/content/discovery/ideas-and-advice/the-versatile-role-of-thermocouples). Thermocouples consist of two dissimilar metals joined together, producing a voltage that varies with temperature. The thermocouple transmitter measures this voltage and converts it into a standardised output signal. Thermocouple transmitters are known for their wide temperature range and ability to withstand harsh environments.

Thermocouple transmitters have the following features:

- Wide temperature range
- Fast response time
- Small size
- Durable construction
- Suitable for extreme environments

## **Key Features of a Temperature Transmitter**

When selecting a temperature transmitter, it's important to consider its key features to ensure it meets your application requirements.

### **Accuracy**

Accuracy refers to how closely the transmitter's output signal represents the actual temperature being measured. High accuracy is crucial in applications where precise temperature monitoring and control are essential. Look for transmitters with low accuracy errors, typically expressed as a percentage of the span or in degrees Celsius.

### **Stability**

Stability refers to the transmitter's ability to maintain its accuracy over time and under varying environmental conditions. A stable transmitter will provide consistent and reliable readings, minimising the need for frequent recalibration.

### **Response Time**

Response time is the time it takes for the transmitter to react to a change in temperature and provide an updated output signal. Choose a transmitter with a fast response time if your application requires rapid temperature monitoring or control.

### **Isolation**

Isolation refers to the electrical separation between the input and output circuits of the transmitter. This prevents interference and ground loops, ensuring accurate measurements and protecting connected equipment.

## **Industrial Applications of Temperature Transmitters**

Temperature transmitters are essential components in various industrial processes, providing accurate and reliable temperature measurements for monitoring and control.

### **Discrete Manufacturing**

In discrete manufacturing, temperature sensor transmitters are used to monitor the temperature of machines, equipment, and processes. This helps ensure optimal operating conditions, prevent overheating, and maintain product quality.

### **Process Manufacturing**

Temperature transmitters are crucial in process manufacturing for monitoring and controlling temperatures in reactors, vessels, and pipelines. They ensure efficient and safe operation of chemical reactions, food processing, and other industrial processes.

### **Energy & Utilities**

In the energy and utilities sector, temperature transmitters monitor the temperature of critical equipment in power plants, refineries, and other facilities. This helps prevent equipment failure, optimise energy efficiency, and ensure safety.

### **Facilities & Intralogistics**

Temperature transmitters are used in facilities and intralogistics to monitor temperature in storage areas, warehouses, and transportation systems. This helps maintain optimal conditions for sensitive goods, prevent spoilage, and ensure product quality.

## **How to Select the Right Temperature Sensor Transmitter**

Selecting the right temperature transmitter is crucial for accurate and reliable temperature measurement in your application. Here are some critical factors to consider:

- **Temperature Range:** Determine the temperature range that needs to be measured. Choose a transmitter with a temperature range that encompasses the expected minimum and maximum temperatures in your application.
- **Output Signal:** Consider the type of output signal required by your control system or monitoring device. Common output signals include 4-20mA, 0-10V, and digital outputs like RS-485 or HART.
- **Sensor Type: **Choose the appropriate sensor type based on your application requirements. Common sensor types include thermocouples, RTDs, and thermistors, each with its own characteristics and advantages.
- **Accuracy and Precision:** Consider the required accuracy and precision of the temperature measurement. Then, select a transmitter with specifications that meet your needs, especially in applications where precise temperature control is critical.
- **Environmental Conditions:** Evaluate the environmental conditions where the transmitter will be installed. Consider factors such as ambient temperature, humidity, vibration, and potential exposure to chemicals or corrosive substances.
- **Mounting and Installation:** Choose a temperature transmitter with suitable housing and mounting options that are compatible with your installation environment.
- **Power Supply:** Determine the power supply requirements of the transmitter and select one with a voltage and power consumption that matches your system's capabilities.
- **Cost and Availability:** Consider the cost of the temperature transmitter and its availability. Choose a transmitter that meets your budget and can be readily sourced from a reliable supplier.

## **Trusted Temperature Indicator Transmitter Manufacturer, Supplier & Distributor in Australia**

RS is your reliable source for high-quality industrial temperature transmitters. We stock an extensive range from industry leaders like [Endress+Hauser](https://au.rs-online.com/web/b/endress-hauser/), [LKMelectronic](https://au.rs-online.com/web/b/lkmelectronic/), and our own [RS Pro](https://au.rs-online.com/web/b/rs-pro/) line. Our selection spans various types and specifications at competitive prices, ensuring you find the perfect temperature transmitter for your application.

We also carry other essential process components, such as [ammeters](https://au.rs-online.com/web/c/automation-control-gear/process-control/ammeters/) and [digital temperature controllers](https://au.rs-online.com/web/c/automation-control-gear/process-control/temperature-controllers/), to provide comprehensive solutions for your industrial automation and control needs. Order your RTD temperature transmitters, PT100 temperature transmitters and other accessories online today. 

## **Buy Temperature Transmitter Online from RS**

We provide dependable delivery from as soon as the next working day. For approved business account customers, delivery is free on all orders over $40. We also welcome offline orders via telephone, email, or fax. For these orders, business account customers with a valid ABN enjoy free delivery on all orders over $80. Convenient self-collection from our Sydney branch is also available.

For more details, please refer to our [Delivery Page](https://au.rs-online.com/web/content/support/all-articles/delivery).



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Siemens Temperature Transmitters

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