Loops that read true.
4–20 mA scaling, sensor ranging and loop budgets without the head-scratching. Built for the instrument techs and electricians who commission water plants.
4–20 mA current loop
Linear scaling + loop resistance budget
The figures shown are an indicative worked example. Every result Tenselo produces shows the inputs it used and the method behind it, so the work can be checked rather than taken on trust.
Why it matters on the job
Scaling that's right
Engineering units mapped to 4–20 mA so SCADA reads exactly what the sensor sees.
Loops that drive
Resistance budget vs supply checked so the transmitter has the headroom to work.
Signals that survive
Cable run, volt-drop and noise margins sorted before you energise.
14 Instrumentation & Control calculators
Every calculator in this category, by its reference code. Running them needs a Tenselo subscription — subscriptions open soon.
-
INS-001 4-20 mA Loop Resistance Budget
2-wire (loop-powered) transmitter: will the supply drive 4-20 mA through the sense resistor, barrier & cable?
-
INS-002 Analog Signal Scaling
Convert 4-20 mA / 0-10 V / 1-5 V / raw counts to/from engineering units, with PLC raw scaling (8/12/16-bit) & under-range
-
INS-003 DP Flowmeter Square-Root Scaling
Differential-pressure flow (orifice/venturi) where flow is proportional to sqrt(DP) - signal <-> flow with low-flow cutoff
-
INS-004 Flowmeter K-Factor / Pulse Scaling
Pulse-output flowmeter (turbine/paddlewheel/mag): K-factor -> flow rate & totalised volume, both ways
-
INS-005 Flowmeter Straight-Length
Upstream/downstream straight pipe a flowmeter needs for accuracy
-
INS-006 Level Sensor Range & Scaling
Measuring span, 4-20 mA scaling, resolution and top/bottom blanking
-
INS-007 Pressure Transducer Range Selection
Pick a sensor range from normal/surge pressure with good turndown and accuracy
-
INS-008 Control Transformer VA Sizing
Size a control/isolation transformer for the continuous (sealed) load and the inrush of the largest device
-
INS-009 Instrument Air Demand & Receiver
Air demand, receiver volume and compressor FAD for pneumatic actuators
-
INS-010 PLC I/O & Control Panel Power
I/O card count (with spares) and the 24 V DC panel supply
-
INS-011 RTU Solar / Battery Autonomy
Battery Ah and solar watts for an off-grid telemetry outstation
-
INS-012 VSD / Soft-Starter Selection
Drive & soft-starter sizing, start method vs DOL inrush (IEC 60947-4 / 61800)
-
INS-013 SCADA Poll / Scan Capacity
Scan-cycle time, channel utilisation and how many RTUs fit the poll rate
-
INS-014 Telemetry Data Budget
Monthly cellular data per remote site from poll rate and payload
Register your interest
Tenselo is in private beta with Australian water professionals. Leave your details and we’ll let you know the moment plans go on sale — no obligation, and we won’t pass your details to anyone.