Help
Plain-language help for every field tool, the PLC handbook, site procedures, and offline use. The working formula stays on the signed-in tool.
- See it in 50 secondsA short walkthrough of the field calculators, the handbook, and working offline.
- PLC handbookHow to use the public field guide.
- Site proceduresCreate, share, and run site checklists.
- Offline useAll 41 calculator engines can run offline. A Pro pass lasts 24 hours.
Signals
- 4–20 mA analog scalingFreeScale a process value to loop current, including linear and square-root transfer.
- Voltage and signal scalingFreeScale a process value to 4–20 mA, 0–10 V, or 1–5 V, linear or square-root.
- Loop check-outProExpected 4–20 mA, 1–5 V, or 0–10 V at each test percent, with a tolerance band.
- PID loop tuningProZiegler–Nichols and Cohen–Coon settings from an ultimate-gain test or a reaction curve.
- Transmitter linearityProFive-point calibration error and terminal-based linearity as a percent of span.
DP Level & Flow
- DP wet-leg / dry-leg levelProHydrostatic level LRV and URV for wet-leg or dry-leg differential pressure.
- DP flowProVolumetric and mass flow from differential pressure for an orifice, venturi, or pitot.
- Orifice plate sizingProBore and beta ratio for a given flow and differential pressure.
- Control valve CvProLiquid and gas Cv with a choked-flow flag.
- Capillary seal driftProFill-fluid density shift and the resulting zero error on a differential-pressure seal.
- Tank level from pressureProLiquid height from gauge pressure, specific gravity, blanket pressure, and the height of the tap.
- Flow totalizerProRate and total from a pulse K-factor, plus the linear current that rate would drive.
Temp
- RTD Pt100 / Pt1000ProCallendar–Van Dusen resistance and temperature for IEC 60751 RTDs.
- Thermocouple Type J / KProType J and K millivolts and temperature with cold-junction compensation.
- RTD tolerance classProIEC 60751 class A and B tolerance, plus 2-wire, 3-wire, and 4-wire lead error.
- Thermocouple typesProNIST ITS-90 millivolts for types J, K, T, E, N, R, S, and B, with a cold junction.
- Thermowell wake frequencyProStrouhal wake frequency against a cantilever natural frequency, using the ASME PTC 19.3 TW 0.8 and 0.4 screens.
Modbus
- Modbus RTU CRC and float orderProCRC-16 for an RTU frame, and IEEE 754 float byte-order decode.
- Modbus RTU frame builderProBuild an RTU request for function codes 01 through 06, 15, and 16, and append the CRC.
- Modbus register decodeProDecode one register as 16-bit, or two registers as an IEEE 754 float, with word and byte swap.
Electrical
- IS entity parameter checkProCompare barrier entity parameters with the field device and cable.
- Loop load and HART resistanceProMaximum loop resistance from the supply, and the HART resistance window.
- Conductor voltage dropProDC or three-phase AC voltage drop compared with NEC branch and feeder guidance.
- Hazardous-area classificationProClass, Division, Zone, Group, and temperature-code reference for NEC Articles 500 and 505. Verify with the AHJ.
- Conduit fillProRaceway fill from conductor count, insulation, and trade size.
- Conductor ampacityProAmpacity by size, metal, temperature column, ambient, and conductor count.
PLC
Oil & Gas
- Pipe & Annular CapacityFreeTubing bore and casing-annulus fluid volume from the oilfield capacity factor.
- Hydrostatic Pressure & Kill Mud WeightFreeHydrostatic pressure and unmargined kill-mud weight from density, TVD, and SIDPP.
- Vertical Tank VolumeFreeIdeal vertical-cylinder volume from a gauge reading, in barrels and gallons.
- Chemical Pump Sight Glass CalibrationFreeSight-glass drawdown for a target pump rate, or the rate implied by an observed drop.
Volume
Well Control
Pumping
- Pump Strokes & Displacement TimeProStrokes and minutes to move a known volume at a stated pump output and speed.
- Mud Weight-Up (Sacks of Barite)ProSacks of barite to raise a starting pit from the current mud weight to a target weight.
- Fluid Cut / Brine BlendingProIdeal mix of two known fluids, or the second volume that cuts the first to a target density.