DP Transmitter Calibration: 5-Point Procedure & Field Traps
Calibrate a differential pressure transmitter end to end. 5-point Up & Down procedure, HART vs analog, JJG 882-2019 interval, and 5 field traps to avoid.
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Low Pressure Transducer Guide: HVAC, Cleanroom & OEM
Spec the right low pressure transducer for HVAC, cleanroom, filter monitoring or OEM use. Ranges 100 Pa-10 kPa, accuracy, mounting, and 6 HMK matches.
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Intrinsically Safe Pressure Transmitter: Ex i Selection & Spec Guide
Compare Ex i and Ex d pressure transmitters, decode ATEX, IECEx, and GB 3836 certificates, and pick the right intrinsic-safety spec for Zone 0/1/2 service.
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Pressure Switch or Pressure Transmitter? A Decision Guide for Plant Engineers
Pressure switch vs transmitter: a five-criterion framework (control, data, SIL, integration, lifecycle) plus HM41 hybrid specs and refinery failure patterns.
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Piezoresistive vs Capacitive Pressure Sensors: Which Fits Your Application?
Compare piezoresistive and capacitive pressure sensors head-to-head: physics, accuracy, temperature drift, media compatibility, and a 4-branch decision framework to pick the right cell.
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Grounded vs Ungrounded Thermocouple: 2×3 Selection Matrix
Grounded, ungrounded, or exposed thermocouple junction? Real τ63 numbers, Class I/II tolerances, and 2×3 selection matrix with Sinopec, Baosteel, CATL cases.
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Thermocouple Extension Wire vs Compensating Cable: Which One Fits Your Loop
Thermocouple extension wire uses the same alloy as the sensor; compensating cable uses a cheaper alloy pair that matches EMF only in the ambient window. Field data on loop resistance, run-length error, GB/ANSI/IEC codes and five wiring mistakes that bury more error than the sensor itself.
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Flush Mount Pressure Transducer: Selection Guide for Sanitary, Sticky & High-Temp Service
When a flush diaphragm beats a threaded port, how to pick the diaphragm material, and which HMK model (HM70, HM28 Sapphire, HM60 Ex) fits your pressure, temperature and sanitary class.
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Submersible Level Transmitter: The 6 Failure Modes That Destroy Accuracy (and the Field Fixes)
A submersible level transmitter lives or dies by how it handles six field stresses — lightning, vent-tube condensation, silt, cable damage, freeze, and chemical attack. Here is the variant-selection and diagnostic playbook our field team uses.
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RTD Wiring: 2-Wire, 3-Wire & 4-Wire Explained (2026)
RTD wiring field guide — why 2-wire adds 8 °C error, how 3-wire cancels lead resistance via Wheatstone, when to use 4-wire Kelvin. Color codes + diagnostics.
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Pressure Transmitter Working Principle: 4 Types (2026)
How a pressure transmitter works — the 6-stage signal chain and the 4 sensing technologies (piezoresistive, ceramic, sapphire, MEMS) compared by accuracy, drift, temperature, and cost.
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DP Level Measurement: Principle, Setup & How to Pick (2026)
Differential pressure level measurement explained: hydrostatic principle, four install configs (open tank, closed tank dry/wet leg, bubbler), LRV/URV calculation, interface measurement, and how DP compares to radar and guided-wave for refinery, tank farm, and separator service.
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Cold Junction Compensation: How It Works & Where It Fails
Cold junction compensation explained: what it is, 5 methods, real error budget for Type K, and the 3 field failure modes nobody documents.
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How a Differential Pressure Transmitter Works (2026 Guide)
Learn how a differential pressure transmitter works — from ΔP sensing and three sensor technologies (capacitive, diffused silicon, resonant silicon) to static pressure effects and 3-valve manifold startup.
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RTD vs Thermocouple: Key Differences and How to Choose
RTD vs thermocouple — compare accuracy, range, response speed, wiring, drift, and cost. Learn the 500°C rule engineers use to pick the right sensor.
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Thermocouple Types Explained: K, J, T, E, N, S, R, B Comparison & Selection Guide
You need to replace a thermocouple — or spec one for a new line — and the catalog shows eight letters. K, J, T, E, N, S, R, B. Each has a different alloy pair, a different temperature ceiling, and a different set of environments where it thrives or fails. Thermocouples are one of several…
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HART vs 4-20mA: HART 7 Guide for Pressure Transmitters
HART isn’t a replacement for 4-20mA — it’s a digital layer on top of it. See when the HART 7 upgrade pays back, and when pure 4-20mA is still enough.
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4-20mA Pressure Transmitter Wiring: 2-Wire, 3-Wire & 4-Wire Guide
You’ve got a new 4-20mA pressure transmitter in hand and you need to wire it correctly the first time — without frying the board, starving the loop of voltage, or spending three hours debugging why the PLC reads zero. Once the loop is wired, the next step is confirming it reads true — see the…
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Gauge vs Absolute Pressure: The 95/5 Rule (and the Sealed-Gauge Trap) for Process Instrumentation
Absolute pressure vs gauge pressure explained by a 35-year refinery engineer — the 95/5 decision rule, the sealed-gauge trap, altitude drift for 5 US sites, and how to pick the right HMK transmitter.
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High Temperature Pressure Transducer: 4 Proven Methods from 250°F to 2192°F (and How to Pick Yours)
Choose the right pressure sensor for high temperature service from +250°F to +2192°F. 4 methods compared with real specs and custom options from HMK-TECH.
