Understand what the number means
Within range, saturation, transmitter failure or reversed polarity: the reading comes with a field interpretation, not just a value.
For instrument technicians and automation engineers
From number to decision, right in the field.
The calculators and sheets instrument technicians use every day — 4–20 mA, DP range, PT100, thermocouple, PID tuning and calibration — explaining every result: what it means, whether it is within range and what to program into the device.
- NIST ITS-90
- IEC 60751
- NAMUR NE 43
- PT · EN · ES
See it working
Drag the level. The transmitter responds.
This is the DP range diagram: HP and LP taps, dry or wet leg and the 4–20 mA signal calculated instantly, with the same numbers as the tool.
- LRV · 4 mA
- 0 kPa
- URV · 20 mA
- 29.42 kPa
- DP
- 18.24 kPa
- Signal
- 13.92 mA
Drag the level in the tank or use the slider below. The upper LP tap remains in the vapor space, above the 100% level. Educational diagram, not to scale.
Why ALOGY Tools
A calculator shows a number. A technician needs a decision.
Program it right the first time
LRV and URV for the DP transmitter, and Kp, Ti and Td in the form, unit and scale your PLC or controller uses.
Document without rework
PDF reports and calibration sheets with no logo or advertising, ready to attach to the customer job.
How it works
A workflow built for field work.
- 01
Calculate
The right calculation, with explicit units and range.
- 02
Check
Tables, limits and the formula used, always in view.
- 03
Understand
What the number means: within range, saturation or failure.
- 04
Simulate
Watch the loop respond before touching the plant.
- 05
Document
Unbranded PDF reports and sheets, ready for the customer.
- 06
Apply
Values in the convention of your PLC, transmitter or controller.
Tools
Ten tools. Each one answers a field question.
Signals and scaling
4–20 mA calculator
What does this current mean in the process?
Process control
PID tuning
Which Kp, Ti and Td should go into the PLC?
Level and pressure
DP level range
Which LRV and URV should go into the DP transmitter?
Temperature
PT100 calculator
How many ohms should I read at this temperature?
Temperature
Thermocouple calculator
How many mV match this temperature?
Data collection and calibration
Temperature calibration sheet
How do I record this sensor calibration?
Data collection and calibration
Pressure calibration sheet
How do I take the pressure points to the field?
Data collection and calibration
pH calibration sheet
How do I document buffers and readings?
Data collection and calibration
Flow calibration sheet
How do I compare the meter with the reference?
Data collection and calibration
Weighing instrument calibration sheet
How do I organise the weighing instrument tests?
PID tuning
The PID you program, not just the one you calculate.
- Gain in engineering units, dimensionless (%/%) or proportional band, from the block ranges.
- Ideal, series or parallel form, with Ti in seconds, minutes or repeats per minute.
- Simulation with SP, PV, output, P/I/D contributions, saturation and anti-windup.
- Compare with the parameters already in the device before changing them.
4–20 mA
The reading comes with a diagnosis.
- 12.43 mA = 52.7% of range ≈ 263.4 °C, in one sentence.
- Negative current? Leads reversed. Zero? Open loop.
- With NAMUR NE 43: failure ≤ 3.6 mA or ≥ 21 mA, saturation and undefined bands.
- LL, L, H and HH thresholds in engineering units, including reverse scales.
Verifiable accuracy
Technical accuracy comes first.
Primary references
Thermocouples from the NIST ITS-90 coefficients, checked against the official tables; PT100 by Callendar–Van Dusen and IEC 60751 classes.
Automated tests
More than 90 tests with reference values, limits, reverse ranges and invalid inputs protect every calculation.
Technical honesty
Formulas and assumptions visible on every screen. An empty field never becomes zero, and the tool warns when a number does not represent the process.
Built for the phone
One hand and gloves: large controls, a +/− key for negatives and readable text on phones.
Your data, your device
Calculations on the device; sheets with a local draft and file backup.
Three languages
Portuguese, English and Spanish on screens, help and reports.
Plans
The same tools on every plan.
Guide + Tools
1 year freeBuy the Instrumentation Guide on Hotmart and get 12 months of ALOGY Tools, with every tool. Past buyers get it too.
Tools Monthly
R$19.90/monthJust the tools, renewed monthly.
Tools Annual
R$149/yearWorks out to R$12.42 a month: R$89.80 less per year than monthly.
Individual plans with Pix or card. Sign-up when sales open.
Questions
Frequently asked questions
Does the report replace a calibration certificate?
No. The tools document calculations and data collection. They state what they do not do: they declare no conformity, uncertainty or traceability without the data from your procedure.
Can I apply the PID tuning straight to the PLC?
It is a starting point calculated from the process model, with simulation and values in the device convention. Applying it to the plant requires an authorised test and monitoring of the loop.
Do Instrumentation Guide buyers get access?
Yes. Buying the Instrumentation Guide on Hotmart includes 1 year of ALOGY Tools, with the same tools as the individual plans. Past buyers of the Guide get it too, with the year counted from when sales open. Renewal at the end is optional.
Does my data go to a server?
Calculations run on your device. Sheet drafts stay in your browser, with a file backup you control.
Does it work on a phone, in the field?
Yes. Screens are designed for one hand and gloves: 44 px touch targets, a +/− key for negative values and text of at least 12 px on phones.
Do I need an internet connection?
To open the tool, yes. Once open, every calculation happens on the device itself.
In which languages?
Portuguese, English and Spanish: screens, help and reports.