How to Choose the Right Pressure Transmitter Model?

• Categories:Industry information
• Time of issue:2024-09-06 15:05

(Summary description) Q1: What type of pressure does the pressure transmitter measure? A: The first thing to consider is the maximum pressure your system experiences. A good rule of thumb is to choose a pressure transmitter with a range up to 1.5 times the maximum pressure of your system. This is because systems, especially in water pressure and process control, often experience pressure spikes or pulses. These spikes can be five to ten times higher than the normal pressure and may damage the pressure transmitter. Continuous high-pressure pulses that approach or exceed the transmitter's maximum limit can also reduce its lifespan. Simply opting for a pressure transmitter with a much higher range isn’t ideal, as this will sacrifice resolution. A better approach is to use a snubber to dampen the spikes, even if it slows the transmitter's response slightly.     Q2: What is the pressure medium? A: It's crucial to consider the medium the pressure transmitter will be measuring. Is it a thick liquid or slurry that will come into contact with the transmitter? Will the transmitter be exposed to corrosive substances or just clean air? These factors can determine which type of pressure transmitter is appropriate for your application.     Q3: What level of accuracy is required? A: Accuracy refers to the transmitter’s output errors, which can result from factors like non-linearity, hysteresis, temperature effects, and more. Temperature changes, zero balance, and other factors can lower a transmitter's accuracy compared to its nominal rating. While higher accuracy transmitters tend to be more expensive, ask yourself: does your system truly need that level of precision? Using a highly accurate pressure transmitter with a low-resolution instrument is an inefficient and costly approach.     Q4: What is the pressure transmitter's temperature resistance? A: Extreme temperatures can affect a pressure transmitter’s performance or even render it unusable. Each transmitter typically has an operating range and a narrower compensation range within which it meets its specifications. Outside of this compensation range, the transmitter can still function but may not perform optimally. Look for the transmitter’s specifications related to temperature errors, like “±x% full scale/°C” or “±x% reading/°C.” Without these parameters, it’s hard to tell if changes in output are due to pressure or temperature fluctuations.     Q5: What type of output is needed? A: Most pressure transmitters offer millivolt, voltage-amplified, milliamp, or frequency outputs. The choice depends on the distance between the transmitter and your system's control or display units, as well as noise levels and electrical interference. For short distances, a millivolt output is often sufficient and cost-effective. For longer distances or high-noise environments, a milliamp or frequency output with additional shielding may be necessary.     Q6: What is the required excitation voltage? A: The pressure transmitter’s output type may determine the excitation voltage needed. Some transmitters with built-in amplifiers can operate over a wide range of unregulated voltage sources, while others need regulated excitation. The decision here will influence system cost and the power source you choose.     Q7: Do the pressure transmitters need to be interchangeable? A: Interchangeability can be crucial, especially for OEMs. If you’re delivering products to customers, recalibrating the entire system each time you swap out a pressure transmitter can be costly. Interchangeable transmitters allow you to replace parts without needing to recalibrate, saving time and money.     Q8: How stable does the pressure transmitter need to be over time? A: Pressure transmitters can drift over time, so it’s important to consider the time stability of the transmitter. Understanding this up front can help minimize potential issues later.     Q9: How durable should the pressure transmitter be? A: Consider the physical demands of the environment where the pressure transmitter will be used. Will it be exposed to high humidity, vibrations, or impacts? The transmitter's housing needs to be robust enough to withstand these conditions.     Q10: How will the pressure transmitter connect to your electrical system? A: Will the transmitter's short cable suffice, or do you need to extend it with a connector? Most pressure transmitters offer either a cable or connector option, depending on your installation needs.