P_gauge = P_abs – P_atm explained for instrumentation engineers. Three industrial worked examples (tank, refinery, HVAC), altitude correction, unit conversions, and HMK transmitter selection.
Decode PSI, PSIA, PSIG, PSID and PSIS on pressure transmitter spec sheets, with conversion formulas, altitude correction table, and HMK / WIKA / Rosemount SKU patterns.
How bimetallic, filled-system, and gas-actuated dial temperature gauges work. Mechanism diagrams, accuracy class, temperature range, and a 3-way selection table.
Decode pressure transmitter symbols on a P&ID. PT, PIT, PDT explained with ISA-5.1-2024 updates, bubble conventions, tag number anatomy, and signal line types.
ASME B40.100, EN 837-1, and GB/T 1226-2017 accuracy class ladder explained: 9 grades, the 4:1 calibration rule, and a 5-factor decision matrix for industrial selection.
Negative pressure gauges in HVAC, cleanrooms, hospital isolation rooms, refrigeration, boiler draft, and automotive. Typical readings + instrument selection.
Temperature element vs transmitter: when do you need each? A 40-year process engineer maps the 5 conditions that decide whether bare RTD or TC works.
Yes, gauge pressure can be negative. A process engineer explains when sub-atmospheric readings are normal, the unit conversion, and instrument selection.
Temperature gauge definition, working principle, 5 types (bimetallic, filled-system, RTD, thermocouple, digital), accuracy classes & selection guide.
Supply pressure gauge spec guide: psi ranges for pneumatic, hydraulic, instrument air & CDL airbrake; P&ID symbol; transmitter upgrade triggers.
Industrial troubleshooting guide for a fluctuating oil pressure gauge. 5-minute decision tree, 5 causes, mechanical cross-check, tools, R/Y/G operations table.
How a Bourdon tube manometer works, the C / spiral / helical types, accuracy class, and the 5 field limits that kill it.
Pick the right pressure transducer for hydraulic, HVAC, oil & gas, chemical, food, pharma, water, and lab service. Decision matrix + accessory + mistakes.
How temperature shifts a pressure sensor reading, the passive and active circuits that correct it, and how to read the +/- %FS/C compensation spec on a datasheet.
A field guide to the 12 parts inside a mechanical pressure gauge: what each component does, what materials they are made of, and which parts wear out first.
Industrial selection guide for electric oil pressure gauges. Compares mechanical Bourdon, sender-driven 240-33 ohm dash gauges, and digital LCD instruments like the HM40 across spec, wiring, and accuracy class.
Step-by-step guide to reading industrial pressure gauges: units, scale math, dual-scale traps, accuracy class, and when to upgrade to digital.
Pressure transmitter types is four axes: reference, sensing, output, certification. 12 worked examples and a 6-step selection workflow.
NPT (60° tapered, ASME B1.20.1) and G/BSPP (55° parallel, ISO 228-1) are not interchangeable. Standards reference, size equivalence, and 3-step thread ID.
Decode the pressure switch symbol on any drawing — NEMA / IEC electrical schematics, ISA-5.1 P&ID (PSH, PSL, PDS), and ISO 1219 pneumatic blocks.