A steam pressure transmitter is a pressure transmitter protected from steam heat, because a saturated-steam line runs hotter than most sensors can tolerate. At 10 bar g, steam sits at about 184 °C, while many standard transmitters top out near 85–125 °C. Read the saturation temperature from the operating pressure first, then pick the protection that keeps the sensing…
A piezoresistive pressure sensor measures pressure by turning the strain on a thin diaphragm into a change in electrical resistance. Diffused resistors form a Wheatstone bridge on a silicon chip. When pressure bends the diaphragm, the resistors stretch, their resistance shifts, and the bridge outputs a small voltage proportional to the applied pressure. Because that…
What makes a pressure transmitter smart, how the digital signal chain and HART actually work, and a plain rule for when a smart transmitter beats a 4-20 mA analog one.
NAMUR NE 43 fault bands on a 4-20 mA loop: the 3.6 mA and 21 mA thresholds, what three manufacturers actually implement, and where the signal gets lost.
Set, measure and monitor room pressure for cleanrooms and isolation rooms: standard setpoints, cascade design, and choosing a low-range DP transmitter.
How to read NACE MR0175 / ISO 15156 for a pressure transmitter: when a tap is sour, why the measuring diaphragm is the hard part, and which wetted materials keep you compliant.
How to measure cryogenic pressure for LNG, liquid nitrogen and liquid hydrogen: the -65 C sensor floor, pressure siphon and remote-seal standoff, fill-fluid freezing, 316L material selection, and range by cryogen.
How to spec a hydrogen pressure transducer: diaphragm material for permeation and embrittlement, range for the hydrogen chain, and ATEX/IECEx zone rating.
How to choose a pressure snubber: porous disc vs piston vs adjustable, sizing for the spike not the steady pressure, and when to measure the pulsation instead.
When to use a diaphragm seal pressure transmitter, how to pick the membrane material and fill fluid, and how to choose between a flush and a remote capillary seal.
How to select a high pressure transducer: range vs proof and burst pressure, sealing by pressure band, sensor technology, and hydrogen service.
How to spec the right IP rating for a pressure transmitter: the two digits, the IP68 depth caveat, IP-vs-NEMA crosswalk, IP69K washdown, and where water gets in.
How to route impulse lines for pressure and DP transmitters: slope, tube size, material, freeze and plugging. Field rules that keep readings honest.
How an electronic pressure switch works, when a mechanical switch still wins, and how to set the setpoint and deadband without relay chatter.
A differential pressure transmitter is still the flow meter you will find on more lines than any other, and not because it is the most accurate. It is cheap, it is hard to kill, and it works on almost any clean fluid. The catch is that the transmitter does not measure flow at all. A…
How a 4-20 mA current loop works: why it uses current not voltage, live zero and NAMUR NE43, loop-powered two-wire wiring, supply sizing, and mA-to-units conversion.
A standard differential pressure transmitter sits at the same temperature as its electronics, and that ceiling is low. On the capacitive HM3051 cell the amplifier is rated only to +93 °C. The silicone-filled measuring element reaches +104 °C. Suppose your process is superheated steam at 250 °C, hot circulating oil at 280 °C, or a column bottom above 300 °C….
Pressure transducer troubleshooting by symptom: no output, stuck at 4 mA, pegged at 20 mA, drift and noise — plus loop checks and when to replace.
Step-by-step pressure transmitter calibration: the 5-point method, what each point should read in mA, pass/fail scoring, and why re-ranging isn’t calibration.
A working engineer’s guide to choosing a sanitary pressure transmitter: process connections, surface finish, the 3-A/EHEDG/ASME-BPE standards, and the CIP/SIP temperature limit that catches people out.