My LoopCal vs OT Toolbox

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/

OT Toolbox is a compact collection of practical tools for automation, controls engineering, commissioning, maintenance, and industrial service. Instead of searching through formulas, tables, and separate apps, keep essential OT calculations organized in one place – directly on your iPhone and without an account. NETWORKING AND INDUSTRIAL COMMUNICATION • IPv4 subnet calculator with network, broadcast, host range, and wildcard • IP comparison plus CIDR and subnet-mask conversion • IP planning, device inventory, and port reference • PROFINET device-name validation • OPC UA endpoint builder • Data-rate, transfer-time, and Ethernet frame-budget calculations SIGNALS AND INSTRUMENTATION • Linear scaling for analog values and PLC raw values • 4–20 mA troubleshooting, loop budgeting, and measurement-error estimation • PT100 resistance and temperature conversion • PT100 lead-wire error estimation • RC low-pass and ADC resolution calculations PLC, DATA, AND MODBUS • Binary, decimal, and hexadecimal conversion • Bit masks and two's-complement representation • Modbus address and FLOAT32 data conversion • Register-block planning and RTU timing • PLC time formats, watchdog sizing, memory demand, and cycle-load analysis ELECTRICAL AND ENERGY • Ohm's law plus active, apparent, and reactive power • Voltage drop and cable losses • 24 V DC power-supply sizing with reserve • UPS runtime and capacitor backup estimation • Energy consumption and operating-cost calculations DRIVES AND PNEUMATICS • Motor speed, motor torque, and gearbox calculations • Encoder resolution, positioning accuracy, and conveyor speed • Drive ramps and braking energy • Air consumption, cylinder force, and valve-island reserve SERVICE AND PRODUCTION • Unit, time, and cycle-time conversion • OEE and MTBF/MTTR availability • Maintenance-interval forecasting • Guidance calculation for safety distance • Formula reference for recurring tasks BUILT FOR DAILY FIELD WORK Clear field labels, units, and contextual help show exactly what to enter. Favorites, history, and templates bring frequently used tools back quickly. Colleague Mode presents results clearly and makes technical calculations easier to share. PRIVACY WITHOUT FRICTION Technical inputs stay locally on your device. No account, no tracking, and no ads. A selection of core tools is available for free. OT Toolbox Pro permanently unlocks advanced calculators and productivity features with one in-app purchase – no subscription. Important: Results are calculation aids. Manufacturer documentation, applicable standards, safety requirements, and review by qualified professionals always take priority.