Transmitter Installation Precautions
Transmitters come in analog, smart, and fieldbus, but they are installed in basically the same way.
The combined accuracy of flow, level or pressure measurement depends on several factors.Although the transmitter has good performance, in order to get the most out of it, proper installation is still very important.Of all the factors that can affect transmitter accuracy, environmental conditions are the most difficult to control.However, there are ways to reduce the effects of temperature, humidity and vibration.
Smart transmitters have a built-in temperature sensor to compensate for temperature changes.Before leaving the factory, each transmitter has undergone a temperature cycle test, and its characteristic curves at different temperatures are stored in the transmitter's memory.At the job site, this feature enables the transmitter to minimize the effects of temperature changes.
Minimize the effects of temperature fluctuations by placing the transmitter in a location protected from drastic changes in ambient temperature.In a hot environment, the transmitter should be installed to avoid direct exposure to sunlight as much as possible, and it must also be avoided to place the transmitter near high-temperature pipes or containers.When the process fluid has a high temperature, a long pressure guiding pipe is required between the pressure tap and the transmitter.If required, consider using a sun visor or thermal shield to protect the transmitter from external heat sources.Humidity is very harmful to electronic circuits. In areas with high relative humidity, the gasket used for the electronic circuit compartment cover must be properly positioned. The cover must be hand-tightened until fully closed and the seal should feel compressed. Do not use tools to tighten the cover. Minimize cover removal in the field, as every time the cover is opened, the electronics are exposed to moisture.
Electronic circuit boards are protected with a moisture-resistant coating, but frequent exposure to moisture can still affect the protective layer's function.It is important to keep the lid tightly closed in place. Every time the cover is removed, the threads will be exposed and rusted, as these parts cannot be protected with a coating.Conduit entry into the transmitter must use a standard sealing method. Unused connections must also be plugged according to the rules above.
Although the transmitter is practically insensitive to vibration, it should be installed as close as possible to pumps, turbines or other vibrating equipment.
Antifreeze measures should be taken to prevent freezing in the measuring chamber in winter, as this will render the transmitter inoperable and may even damage the capsule.
NOTE: When installing or storing the level transmitter, the diaphragm must be protected to avoid scratches, dents or perforations on its surface.
The transmitter is designed to be robust and lightweight, making it relatively easy to install. The standard design of the three-valve manifold can be perfectly matched to the transmitter flange.
If the process fluid contains suspended solids, install valves or pipe joints with connecting rods at a certain distance to facilitate pipe cleaning.
Before each impulse line is connected to the transmitter, the inside of the line must be cleaned (ie, purged) with steam, compressed air, or by draining the process fluid.