How to find the right Pressure Probes & Sensors AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Pressure Probes & Sensors
- Pressure reference type
- Match gauge (vented), sealed gauge, absolute or differential to the measurement. Use absolute for barometric or vacuum work and gauge for system pressure relative to atmosphere. A gauge sensor in a sealed enclosure or at altitude reads wrong, and an absolute sensor reads about one atmosphere high when you expected zero.
- Range and overpressure
- Size full scale so normal operating pressure sits in roughly the middle to upper part of the range. Check that the proof and burst ratings exceed the system's pressure spikes. Oversized ranges waste resolution, and spikes from pumps or water hammer can permanently shift or rupture an undersized diaphragm.
- Output signal and supply
- Ratiometric 0.5–4.5 V outputs need a regulated 5 V supply. 4–20 mA suits long cable runs. I2C or SPI digital outputs are for board-level and microcontroller use. A ratiometric reading tracks supply voltage, so a noisy or wrong supply corrupts the measurement.
- Process connection thread
- Confirm the exact thread standard and size, such as 1/8 NPT, 1/4 NPT or G1/4 BSPP. NPT and BSP threads look similar but do not seal against each other, which causes leaks or damaged ports.
- Wetted materials and media
- Use 316L stainless or a ceramic diaphragm for oil, fuel, water and refrigerants. Use a dry-gas-only sensor only with clean, dry air. Unsuitable wetted parts corrode or swell, and many low-cost silicon sensors are rated for dry gas only.
- Accuracy over temperature
- Compare total error band across the operating temperature range, not just accuracy at room temperature. Thermal drift often outweighs headline accuracy in engine bays, outdoor sites and hot process lines.
Brands that matter
- Honeywell: Broad range of board-mount and industrial sensors with thorough datasheets.
- TE Connectivity: Includes the Measurement Specialties line, strong in OEM transducers and stainless media-isolated sensors.
- WIKA: Industrial pressure sensors with many thread and output options.
- Gems Sensors: Rugged general-purpose transducers for hydraulics and pneumatics.
- Setra: Known for HVAC and low-differential-pressure sensors.
- Keller: Piezoresistive sensors suited to high-accuracy and level applications.
- Bosch: Common automotive MAP and fluid pressure sensors.
What to avoid
- Unbranded sensors sold without a datasheet stating range type, output and wetted materials.
- Dry-gas-only silicon sensors used with liquids, oil or humid air.
- Mixing NPT and BSP fittings, or using thread tape on parallel BSPP threads that seal with a bonded washer.
- Running a ratiometric 5 V sensor directly from an unregulated 12 V vehicle supply.
Questions
What is the difference between a sensor, a transducer and a transmitter?
These terms are used loosely. Typically a sensor or transducer outputs millivolts or volts, while a transmitter outputs a conditioned 4–20 mA signal suited to long runs and control systems.
Do I need a vented cable for a gauge sensor?
Yes, for true gauge readings in submersible or sealed installations, because the sensor must reference atmospheric pressure. Otherwise choose a sealed gauge or absolute unit.