⚡ DDC Field Instrumentation (4-20mA Current Loops vs 0-10VDC Signals Voltage Drop)

DDC Analog Input Signal Calculator

Model wiring distance limits and signal attenuation for Building Automation DDC analog inputs: compare noise-immune 4-20mA two-wire current loops (capable of 1,000+ ft runs with zero signal drop across 250-ohm input resistors) versus 0-10VDC voltage signals (subject to wire resistance voltage drop and EMI noise), and BAS installation profits.

1. Project & Operating Inputs

DDC Analog Sensor Points Wired (Sensor Count e.g. 140 Sensors)

Average Wire Run Length (Feet e.g. 350 ft Distance to DDC Panel)

Customer Bid Price for Supplied & Calibrated DDC Sensors ($ / Point)

4-20mA Pressure/Temp Transmitters, Shielded Cable, Terminal Blocks & Tech ($)

2. Financial Breakdown & Yield

DDC 4-20mA CURRENT LOOPS

Turnkey DDC Instrumentation Profit

HVAC Controls Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost