# I&C Pro-Instrument Tools — 4-20mA, DP, Thermocouple, RTD

> 4-20mA, DP, Thermocouple, RTD (iPhone/iPad app by I&C Pro.)

- Source: https://appshunter.io/ios/app/i-and-c-pro-instrument-tools/id6745476067 (this page in markdown: same URL + `.md`)
- Developer: [I&C Pro](https://appshunter.io/developer/1812421237)
- Category: Productivity, Utilities
- Price: $4.99
- Age rating: 17+
- Requires: iOS 18.4 · 12 MB
- Languages: Russian, Vietnamese, American English, Arabic, Indonesian, European Spanish, Korean, Brazilian Portuguese, Chinese (Simplified, China), French (France)
- Released: 2025-05-05
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/i-and-c-pro-instrument-tools/id6745476067/reviews.md

## What is I&C Pro?

I&C Pro is a comprehensive calculator toolkit built by a working power plant commissioning engineer, for instrumentation and control (I&C) engineers who work at the plant. No spreadsheets or reference tables — every calculation you need is one tap away.

■ 16 calculators across 7 categories

[Loop & Signal]
- mA → Set Value: Convert 4-20 mA current signal to process value
- Set Value → mA: Convert process value to 4-20 mA signal
- Square Root Converter: Linear ↔ √ mA linearization

[Flow & Pressure]
- DP ⇌ SCALE Converter: Between differential pressure and flow rate
- O₂ Compensation: Compensate gas value by reference O₂
- Gas Unit Converter: ppm, mg/m³, %, mg/L

[Temperature]
- Thermocouple Converter: NIST-based T/C mV↔temperature (K, J, T, E, and more)
- RTD Pt100 Calculator: Resistance↔temperature for Pt-385/Pt-392 (2/3-wire compensation)

[Tank & Silo]
- Tank Level Calculator: Cylindrical tank volume and level, drawn to the entered proportions
- Silo Level Calculator: Cylinder+cone silo capacity, mass and estimated run time

[Instrument Calibration]
- Pressure Visualizer: Interactive absolute / gauge / vacuum / atmospheric relationship, live comparison across 11 pressure units
- Chemical Tank Level Tx Verification: 22 water-treatment chemical presets (HCl, H₂SO₄, NaOH, N₂H₄, NH₄OH and more), temperature correction, transmitter verification and diagnosis
- Level Compensator: Heater and drum level density compensation (new)

[Vibration]
- Vibration Converter: Displacement-Velocity-Acceleration for rotating machinery (Bently Nevada mils/ips ↔ ISO mm/s, RMS/0-p/p-p)
- Disp Probe Gap & Simulation: Displacement probe gap calibration, VMS signal simulator, sensor library, DXD gap setting

[Utility]
- Percentage Calculator: Percentage, increase and decrease

■ Level Compensator — the heart of this release

Saturated water and steam change density sharply with pressure, so a DP level transmitter does not read the true level without density compensation. Level Compensator computes the difference.

- Two DCS algorithms: Siemens T3000 LEVEL block (ID 605) and Emerson Ovation LEVELCOMP
- Four vessels: HP heater, LP heater, flash tank, HRSG steam drum — each with its own schematic
- Built on IAPWS-IF97 steam tables (Regions 1/2/4)
- Enter DP, mA or a sight-glass reading — the signal chain resolves either direction
- Gauge-glass density correction, shown as a reference for how low the glass reads
- DCS zero offset, alarm setpoints, and display end-stop handling
- Per-project configuration profiles

Verified against real plant operating data — from 1 bar to 200 bar, across two DCS vendors, including a full day of 2880 samples.

■ Key features

- Fully offline — works inside plant networks with no connectivity
- Live calculation — results update as you type
- Guidance panel on every calculator — purpose, inputs, formula and field tips
- 10 languages — English, 한국어, Tiếng Việt, Bahasa Indonesia, 中文(简体), العربية, Español, Français, Português, Русский
- Project profiles — save and recall setups on the configuration-heavy calculators
- Grounded in real field work — used on site by the engineer who wrote it

■ Who it is for

- Power plant commissioning engineers
- Instrumentation and control staff at refineries and chemical plants
- Instrument maintenance and calibration technicians
- Nuclear, thermal, combined-cycle and solar generation professionals
- I&C students and instructors

Built by a field engineer, for field engineers.

- Speed Probe & Teeth: compares the rpm that different tooth counts produce from the same pulses — diagnoses redundant probes that share constants and fail together.


## Version history (last 5 releases)

### 2.1 — 2026-08-11

Fixes a crash that closed the app when opening the Level Compensator on iOS 26. Apologies for the disruption.

- The reference-leg temperature was held in two separate fields, one per vendor tab. One configuration could therefore give very different answers on Siemens T3000 and Emerson Ovation. Now there is one field.
- Switching vendor tabs no longer overwrites your inputs, so a single configuration can be compared across both.
- Saved configs are now kept per vessel type. Existing saves are moved automatically.
- A warning when the two vendor tabs disagree by more than their density correlations explain — this catches a CALIB Range entered in the wrong direction.
- New calculator: Speed Probe & Teeth. Compares the rpm two different tooth counts produce from the same pulses.

### 2.0 — 2026-08-03

v2.0 — New Level Compensator, and 10 languages

■ New: Level Compensator

Density compensation for power plant heater and drum levels. Computes the difference between what a DP level transmitter indicates and the water level actually standing in the vessel.

- Two algorithms: Siemens T3000 LEVEL block and Emerson Ovation LEVELCOMP
- HP heater, LP heater, flash tank and HRSG steam drum, each with its own schematic
- Built on IAPWS-IF97 steam tables
- Enter DP, mA or a sight-glass reading
- Shows how far low the gauge glass reads, as a reference figure
- When the level runs past the scaled range, reports the real level and the pinned display side by side

Verified against real operating data — 1 bar to 200 bar, across two DCS vendors.

■ 10 languages

English, 한국어, Tiếng Việt, Bahasa Indonesia, 中文(简体), العربية, Español, Français, Português, Русский.
Arabic includes right-to-left layout.

■ Disp Probe Gap & Simulation, extended

- Sensor library — pick a manufacturer's sensitivity and zero voltage to simulate against
- Turbine measurement point library — journal bearings, thrust, eccentricity, key phasor, expansion detectors
- Record — a worked gap-voltage record sheet with automatic linear-window fitting
- DXD Setting — dual differential expansion detector gap setting with an animated schematic

■ Project profiles

Save, recall, rename and delete per-site setups on the configuration-heavy calculators.

■ Improvements

- Tank / Silo — dimensions in mm, drawn to the entered proportions, silo run-time estimate
- Tidier Tank / Silo layout — two-column inputs, redundant rows removed
- Pressure unit selection (gauge / absolute) with a span consistency warning
- Stronger input sanity warnings across the calculators

### 1.8 — 2026-07-09

A major expansion built around real field commissioning experience.

[2 new categories and 4 new calculators]

■ Instrument Calibration (new category)

- Pressure Visualizer
Interactive visualization of absolute/atmospheric/gauge/vacuum pressure relationships with a live 11-unit comparison table (bar, mbar, kPa, mmH₂O, psi, kgf/cm², atm, and more). Optimized for condenser-vacuum, steam-drum, and other real plant scenarios.

- Chemical Tank Level Tx Verification
22 preset power-plant water-treatment chemicals (HCl, H₂SO₄, NaOH, N₂H₄, NH₄OH, NaOCl, FeCl₃, and more) with automatic SG temperature compensation (individual β coefficients). Shows actual liquid height, error vs. Design SG, and mechanical gauge deviation with Case-by-Case diagnostic. Optional Tank Height input gives a % full readout.

■ Vibration (new category)

- Vibration Converter
Displacement-Velocity-Acceleration conversion for rotating machinery. RMS / 0-p / p-p amplitude types, both metric (µm, mm/s, m/s²) and imperial (mils, ips, g) — perfect for cross-checking Bently Nevada, SKF, Emerson, and CSI instruments.

- Disp Probe Gap & Simulation
Purpose-built for the two field workflows on a displacement probe channel: (1) DC Gap calibration and axial-displacement trip setpoint calculation, and (2) AC signal simulator (1510A-style) injection into the VMS for loop check, signal-range verification, and alarm/trip testing.

[Fixes and improvements]

- Fixed a cyclic-update bug where typing into the Square Root Converter would immediately overwrite the value
- Streamlined submission workflow (encryption compliance auto-declared)
- Various UI polish and consistency improvements

Now 15 calculators strong. Feedback from commissioning engineers is always welcome.

### 1.7 — 2026-06-02

New in 1.7

- New Temperature tools: Thermocouple Converter (T/C ↔ mV, types K/J/T/E) and RTD Pt100 Calculator (resistance ↔ temperature)
- New Silo Level Calculator — cylinder + cone volume & mass
- Redesigned home screen with quick search across all calculators
- Refined UI and improved calculation accuracy
- Bug fixes and performance improvements

### 1.6 — 2026-04-22

• Improved overall UI design
• Enhanced input UX: numeric keyboard, automatic keyboard dismissal
• Upgraded Tank Level Calculator: auto density calculation, real-time level display
• Improved calculation accuracy and bug fixes

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*