My LoopCal: 4-20mA Calibration

LoopCal turns a 4–20 mA loop check into a calibration worksheet you can hand over, and it is the quickest way to convert a signal in the field. Built for instrumentation and calibration technicians. Fully offline.

FROM CHECK TO WORKSHEET
• Guided three-point, five-point, and custom 2–21-point checks
• As-found and as-left runs, with the error and pass/fail at every point
• Up-scale and down-scale readings with hysteresis
• Tolerance as percent of span, signal units, or engineering units
• Worst point and maximum error summarized for you
• A clean PDF worksheet with your company name and logo, in US Letter or A4, plus CSV for your records

CONVERT IN SECONDS
• 4–20 mA, 0–20 mA, 0–10 V, 1–5 V, and your own custom signal endpoints
• Direct-acting and reverse-acting ranges
• Linear and square-root (flow) transfer functions
• Engineering ranges with any unit, including negative and offset spans
• Percent, signal, and engineering values update as you type, with the substituted formula shown
• Verify this loop: take the range you just entered straight into a check

EVERY INSTRUMENT ON RECORD
• Save instruments with their ranges and calibration history
• See what is coming due, and get a reminder before the next calibration
• Reopen a saved instrument and start its next check without retyping the range

LOOP POWER MATH
• Shunt resistor voltage drop
• Required supply voltage and remaining compliance
• Maximum loop and wire resistance

PRIVATE BY DESIGN
• Everything runs on your device. No account, no ads, no tracking, no network.

LoopCal is a calculation aid and field worksheet — not a calibrator, an accredited calibration service, or a replacement for manufacturer procedures. Always follow site lockout/tagout, operations authorization, device manuals, and approved procedures.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/