
Pressure Sensors & Transmitters

Pressure sensors detect, regulate or monitor pressure and convert the input data into an electronic output signal. Gauge pressure sensors measure pressure relative to atmospheric pressure. Absolute pressure sensors measure pressure relative to absolute zero pressure. This allows for very precise measurements. Differential pressure sensors use two different pressure ports and measure the difference between the two.
Pressure transducers convert an applied pressure into a measurable electrical signal that is proportional to the applied pressure. An elastic material inside of a pressure transducer will deform when exposed to a pressurized medium and an electrical device will detect the deformation and convert the result into a usable electrical signal. The electrical signal is not linearized or temperature compensated. Pressure transmitters amplify, linearize and compensate the signal from a pressure transducer and transmit the signal to a remote receiver.
Dwyer Mercoid Series 626 Pressure Transmitters contain a full-scale accuracy (0.25%) piezo-restive sensor in a NEMA 4X (IP66) stainless steel general purpose housing or cast aluminum conduit housing. The Series 628 Pressure Transmitters are ideal for OEMs with 1% full scale accuracy sensors. Both Series 626 and 628 transmitters are corrosion-resistant and are available in absolute and gauge pressure ranges with a variety of optional outputs, process connections and electrical terminations.
APG PT-400 Pressure Transducers are designed for harsh environments, high pressure spikes, high vibrations and extreme temperatures. A Modbus RTU output on the PT-400 pressure transmitter is compatible with any Modbus PLC or controller.
Products
2 pieces of hardware used in modern day instrumentation: measuring elements and transmitters.
Measuring elements are the part of the device that performs the measurement. For example, the measuring element of a pressure transducer is the part that is actually lowered into a tank that will take a pressure measurement. The measuring element of a flow meter is the part that actually measures the flow and an RTD or thermocouple takes the temperature measurement.
Transmitters collect information from measuring elements and sends the information to where it is needed. The transmitter interfaces with the measuring element and interprets the information. It then sends that information to a PLC, RTU or some other type of control unit. In many cases, the transmitter has the ability to communicate the information via multiple communication protocols. This may be necessary when the measuring element does not send the same type of signal that is needed by the controller. For example, it may be necessary to convert a temperature reading from a thermocouple to a 420 milliamp signal that can be received by a local PLC.