CALIBRATION AND MAINTENANCE

UM344-2

2)Disconnect the test resistance decade box and connect the test millivolt source to the transmitter. See Figure 6-4.

3)Turn ON the power supply and proceed to section 6.1.4.2 and perform the Narrow/Wide Millivolt calibration procedures.

6.1.4Thermocouple/Millivolt Type Input Calibration

The calibration check consists of substituting a millivolt source for a thermocouple (TC) or mV (slidewire potentiometer) type sensor. Millivolt values corresponding to Zero and Full Scale temperatures are applied to the transmitter and the indicated output checked for accuracy.

Narrow/Wide Millivolt calibration consists of applying one low and one high millivolt signal to the transmitter and entering them into EPROM.

Narrow Millivolt:

Applicable to mV inputs between -11.00 to +26.00 millivolts including inputs from an

 

R, S, T, or B type thermocouple.

Wide Millivolt:

Applicable to mV inputs between -18.00 to +103.00 millivolts including inputs from a

 

J, K, E, or N type thermocouple.

6.1.4.1 Thermocouple/Millivolt Calibration Check

1. Connect test equipment to transmitter as shown in Figure 6-4.

X02827S1 2 of 2

Bench Power

_

 

Supply (DC)

+

 

 

 

DVM

+

_

 

 

 

Millivolt

+

Source

_

 

 

MXC

250

Signal

 

Test

+

_

+

_

 

 

 

1

2

 

3

 

 

 

 

Model 344

 

 

 

 

Terminals

FIGURE 6-4 TC/mV Input Accuracy Check and Calibration Set Up

6-10

September 1995

Page 112
Image 112
Siemens UM344-2 user manual Thermocouple/Millivolt Type Input Calibration, Thermocouple/Millivolt Calibration Check

UM344-2 specifications

The Siemens UM344-2 is a cutting-edge industrial controller designed to meet the demands of modern automation and control systems. This powerful device is specifically developed for use in various applications, including manufacturing, process control, and machinery integration. The UM344-2 stands out for its versatility and robust performance in harsh industrial environments.

One of the main features of the Siemens UM344-2 is its high processing speed, which allows for real-time data processing and decision-making. The controller utilizes advanced microprocessor technology, ensuring quick response times and efficient operation. Its architecture supports multitasking, enabling it to manage multiple processes simultaneously without compromising performance.

The UM344-2 features a modular design, which provides flexibility in configuration and scalability. Users can easily add or remove modules to tailor the system to specific application requirements. This adaptability is beneficial for businesses that need to scale their operations or adjust to changing production demands. The controller is compatible with a variety of I/O modules, allowing for seamless integration with other equipment and systems.

In terms of connectivity, the Siemens UM344-2 supports various communication protocols, including Profibus, Profinet, and Ethernet. This versatility ensures smooth data exchange between the controller and other devices in the automation ecosystem, facilitating comprehensive monitoring and control. The inclusion of these communication standards enhances interoperability and allows for the integration of legacy systems with newer technology.

The Siemens UM344-2 is equipped with advanced diagnostic tools, which enable users to monitor system performance and detect potential issues in real-time. This feature reduces downtime and maintenance costs by allowing for proactive management of the system. The controller also supports remote access capabilities, enabling technicians to troubleshoot and configure systems from off-site locations.

Safety is a critical consideration in industrial environments, and the UM344-2 is designed with this in mind. It incorporates safety-certified features, ensuring compliance with international safety standards. Users can implement safety functions directly within the controller, streamlining system design and reducing the need for external safety components.

Overall, the Siemens UM344-2 exemplifies the fusion of technology and practical application, making it an essential component for businesses looking to enhance their automation processes. With its high performance, flexibility, and focus on safety, the UM344-2 is a reliable choice for industries aiming for efficiency and innovation in their operations.