A pressure transmitter is a device that creates a signal according to a pressure measurement of a liquid, vapor, or gas. Changes at the pressure source cause the diaphragm, or sensing element, to flex. The changes in the diaphragm are recorded as measurements. Measurements collected from the diaphragm response are translated into signals that travel on the transduction element to provide instructions to the control system. The control system sends instructions to maintain the preset density, level, flow, speed, or altitude. The technology, configuration, application, performance specifications of pressure transducers can vary widely.
Multi-sensing pressure transmitters, sometimes referred to as multivariable pressure sensors, supply external devices with multiple process readings. The sophisticated transmitters quantify volumetric system pressure as absolute measurements, differential values, and temperature to generate accurate mass flow readings. Collating three data points is critical in situations with vapors, gases, or fluids that may shift in density. Without multi-sensing pressure transmitters, three separate devices would be required to gather the three separate pieces of information. An additional piece of equipment would be needed to combine and calculate the information. Multi-sensing pressure transmitters integrate all the tasks into a single design solution. The local flow reader is embedded in the device and communicates directly with the flow computer or remote terminal unit (RTU). Density changes are seamlessly corrected in temperature-bound environments. Readings can be updated as frequently as the conditions necessitate.
There are a multitude of variations of multi-sensing pressure transmitters. Instrument selection is based on criteria such as the range of pressure, the connection, the output signal, and desired measurement accuracy. Multi-sensing pressure transmitters are integral to chemical, water transport, power, marine operations, oil and gas, and pulp and paper manufacturing and development processes. Industrial operations depend upon detailed monitoring and control. The industrial pressure transmitters monitor mass flow and calculate changes in response to temperature. In a closed gas tank, a multi-sensing pressure transmitter monitors the gas conditions such as density and moisture levels. It records pressure and temperature and collates the information in a microprocessor.
Analog pressure transmitters report single variables along individual outputs. Analog devices also have pulse transmitters that simultaneously report the flow, rate, and status. Digital pressure transmitters report all variables simultaneously. Environments that must remain sterile, conserve energy, and sustain accuracy typically utilize absolute pressure transmitters
With many devices, the flow compensation can be managed on a basic setting or on an automatic setting. Auto compensation connects with the FlowNavigator to manage viscosity, density, and expansion with a high degree of accuracy. Basic compensation is managed according to manually designated data using conventional formulas. Both strategies adhere to Highway Accessible Remote Transducer (HART) protocol which is the global standard for sending and receiving information between devices and control systems. HART protocol ensures communication with a multitude of field devices. Commutation compatibility is also ensured through FOUNDATION fieldbus and RS485 Modbus. FOUNDATION fieldbus is a digital, serial, two-way communication system for a base-level manufacturing network. RS485 Modbus is a serial data transfer standard that is ubiquitous in industrial settings.
Guidelines for Troubleshooting Pressure Transmitters
Multi-sensing pressure transmitters simplify the intake and calibration processes. Fewer wires and fewer instruments are needed. Installation and maintenance are streamlined because there are fewer components to install and service. The modular construction also simplifies the servicing processes. However, because they are precision instruments, pressure transmitters do require the expert skill of a technician or engineer for installation.
There are key safety concerns to keep in mind while handling pressure transmitters. The instruments can reach high temperatures, and there is a risk of explosion due to high pressure. Additionally, the liquids, vapors, or gases monitored by the devices can be toxic. Follow the recommended safety guidelines of the site.
Many devices are equipped with self-diagnostic functions. In the case of a mechanical or electric issue, the integral indicator will display an alarm code. Each device model has a manual to reference for detailed troubleshooting instructions and a list of alarm codes. Generally, if an abnormal measurement appears, and the process variable is also abnormal, the process system needs to be inspected. If the process variable is not abnormal, there is likely a problem in the measurement system. After inspecting the measurement system, ascertain whether or not the problem exists in the receiving instrument. If it does, inspect the receiver. If it does not, examine and adjust the environmental conditions, the operating conditions, and the actual transmitter.
For the highest quality instruments, expert advice, dedicated technical support, TechStar is the industry leader. Since 2001, TechStar has been a trusted supplier of analytical tools and devices that meet the most rigorous safety and quality standards. With a multitude of manufacturing partners, exceptional customer service, and a robust training program, TechStar can guarantee the perfect, innovative solution for all of your muti-sensing pressure transmitter needs. Contact TechStar today!