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Pressure Transducers

Filter Options:
Output
4-20 mA
Modbus RTU
Voltage
mV/V
Tank Cloud Slave
Range
0-40,000 psi
0-20,000 psi
Up to 450 ft.
Up to 346 ft.
Lightning Protection?
Yes
No
Certification
Class 1, Div 1
N/A
ATEX
IECEx
NACE
Intrinsically Safe
CE

Product Selection

PT-L1/L3/L10 Amplified Output Pressure Transducers

Output:
4-20 mA,Voltage,
Range:
0-40,000 psi,
Lightning Protection?:
No,
Certification:
N/A,
Details

PT-L9/L13/L14 Millivolt Output Pressure Transducers

Output:
mV/V,
Range:
0-40,000 psi,
Lightning Protection?:
No,
Certification:
N/A,
Details

PT-400 Heavy Duty Pressure Transducers

Output:
4-20 mA,Modbus RTU,Voltage,Tank Cloud Slave,
Range:
0-40,000 psi,
Lightning Protection?:
Yes,
Certification:
Class 1, Div 1,ATEX,IECEx,Intrinsically Safe,
Details

How They Work

Our pressure transmitters, also known as pressure transducers, use piezoresistive technology to accurately measure pressure. This is based off of a small circuit called a Wheatstone bridge attached to the back of a diaphragm. As the diaphragm flexes from pressure, the resistance in the Wheatstone bridge (hereafter known as the “sensing element”) changes relative to pressure, providing a basis of measurement.

There are a few different methods of mounting the sensing element to the pressure transmitter diaphragm. Each has it’s own set of pros and cons. For example, some perform better in low pressure environments, others in high pressure. We’ll use the best method according to the configuration of your sensor.

Once the measurement is taken, the transmitter conditions the signal to the output you have chosen and sends it off to your control system.

Features Tour

While we only list a few pressure transducer families, each has a wide variety of configurable options when you purchase. These include options for:

  • outputs
  • pressure ranges
  • electrical connections and pin outs
  • and process fittings

Most allow you to adjust the zero and span in the field as well.

Applications

APG pressure transmitters are used throughout industry, in both process and storage environments. Our PT-L families are built for industrial applications in pressure ranges up to 10,000 psi, and are suitable for both liquids and gasses. They are designed to provide accurate measurements and a long life expectancy at a low cost.

Our PT-400 family is designed for extreme environments. In particular, our heavy duty pressure transducers are designed to handle:

  • dirt & fine dust
  • water spray & washdowns
  • outdoors & inclement weather
  • hazardous locations
  • high vibration

They’re popular in the Oil & Gas industry where demanding conditions are further complicated by hazardous classified areas. In particular, our PT-400 pressure transmitters are well suited for applications with extreme vibration - where other pressure transducers tend to fall apart.

FAQs

Do your pressure transmitters have lightning protection?

Yes. Our popular PT-400 model is commonly used in outdoor locations such as lift stations, oil rigs, and tank farms, and has built-in reverse polarity and surge protection compliant with IEC 61000-4-5. Our standard duty models are meant for indoor environments and do not have lightning protection.

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Do you offer heavy duty pressure transducers for oil & gas?

Yes. The PT-400 is designed for outdoor use in harsh and hazardous conditions. It's hazardous location certifications include CSA Class 1, Div. 1, ATEX, and IECEx approvals for worldwide use. It's also built to withstand intense vibration common on oil rigs.

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I just need a simple transducer - nothing fancy. What do you have?

We have two varieties of simple pressure transducers. Our PT-L9/13/14 series have a non-amplified mV/V output, is super compact, inexpensive, and great for anywhere you won't have a lot of electrical noise. Our PT-L1/L3/L10 series has an amplified output (VDC & 4-20mA), is compact, still inexpensive, and works better where electrical noise is more of a concern.

These models aren't beefed up for extremes like our larger PT-400, but they're just as reliable in controlled environments and often trusted in critical applications.

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Why use MEMs instead of strain gages?

Different sensing elements have different pros and cons. The pros of a MEMs transducer is that it's more stable and costs less. However, strain gages and foil gages have their own set of pros that make them preferable in the right circumstances. Rest assured, we use whichever type of transducer that is most suitable for your application.

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How often do your pressure transmitters need calibration?

We recommend having your pressure sensor calibrated at least once per year, or annually. However, most ISO 9001 compliant maintenance schedules are adequate. If you ever start to question your sensor's accuracy, have it calibrated. We can calibrate any of our own sensors. Contact us for a quote.

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What is the overpressure rating?

In general, the overpressure rating is 1.5X full scale range. But this changes based on the configuration and pressure range of your sensor. The higher the pressure range, the less overpressure you can get away with. Burst pressure is another important spec. This depends on the yield strength of the material used to make your pressure diaphragm. Consult with us on your specific model for more detail.

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