When selecting a transmitter, users should focus on the accuracy, safety, durability, and features of the device. The market for pressure transmitters was valued at $2.38 billion in 2008 and is projected to increase to $2.85 billion by 2013. The most recent models incorporate intelligent features that reduce intrusion and penetration. They also allow for upgrades to Profibus PA and Foundation Fieldbus systems. Here are some tips to help you select the right pressure transmitter for your application.
A transmitter's accuracy and repeatability rely on the calibration of the device. The process temperature is the temperature of the process media, while the Response Time measures the time it takes to change the measured value. The transmitters proof pressure rating is usually expressed in percent of calibrated span. A high-end model should be accurate to within 1% of the stated range. A low-cost model may be inaccurate and have poor repeatability.
The proof pressure of a transmitter is the maximum pressure it can withstand without losing accuracy. It is also known as the overpressure capacity, and is specified as a multiple of the upper limit of the device's range. For example, a proof-pressure of 2X means the device can withstand an overpressure of 200 PSI. It will have a positive zero shift when its overpressure exceeds this limit.
Proof pressure is also known as overrange capacity. This is a specification for the maximum pressure a transmitter can withstand in a single measurement. It is usually given as a multiple of the device's range. For example, a proof-pressure of 2X indicates that the device can withstand a pressure of 200 PSI and recover. Any higher than this will result in a positive zero shift.
The proof-pressure rating of a pressure transmitter is important for applications where reliability is of paramount importance. A high-quality pressure transmitter is essential in critical areas, where it is essential to minimize the risk of accidental failure. It should also be protected from electromagnetic interference. A flame-proof device is an explosion-proof device. The SITRANS P310 is an intrinsically safe and highly accurate digital pressure transmitter. It is also intrinsically safe and designed for highest level measurement requirements.
Differential pressure transmitters have different proof-pressure ratings, but there are four main types of these devices: absolute pressure, gauge pressure, and multivariable. The difference between these two points is known as the differential pressure. The differential-pressure transmitter is characterized by a high proof-pressure rating. Its differential-pressure rating is the difference between two points and measures the differential pressure between them. There are two types of sensor: the diaphragm seal and the dual-seal seal. The former is the more expensive one.