SECURITY LOOP SUPERVISION · EN 50131 GRADE 2/3

Size & Simulate Alarm EOL Resistor Loops

Precision calculation for Single (SEOL), Double (DEOL), and Triple (TEOL) security loops. Calculate two-conductor copper wire resistance drops, inspect 4-state tamper tables, and verify ADC threshold windows across major panel manufacturers.

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⚡ Interactive Loop Diagnostic Laboratory

Simulate real-world field conditions, wire lengths, and sensor states with real-time digital multimeter feedback.

ZONE LOOP CIRCUIT & MULTIMETER BENCH
Two-Conductor Wire Drop12.72 Ω
Placement StandardFar-End Sensor Housing
5.61kΩ
SECURE (NORMAL)
Calculated Terminal Voltage2.48 V DC
Panel Acceptance Range5.04k – 6.16k Ω
Compliance RatingEN 50131 Grade 2

📊 Manufacturer Resistance Standard Matrix

Panel Family SEOL Nominal DEOL Normal DEOL Alarm Tamper (Short) Tamper (Open)
DSC PowerSeries Neo 5.6k Ω 5.6k Ω 11.2k Ω 0 Ω ∞ Ω
Honeywell Vista 2.0k Ω 2.0k Ω 4.0k Ω 0 Ω ∞ Ω
Paradox EVO / Spectra 1.0k Ω 1.0k Ω 2.0k Ω 0 Ω ∞ Ω
Texecom Premier 2.2k Ω 2.2k Ω 6.9k Ω 0 Ω ∞ Ω
Bosch B / G Series 1.0k Ω 1.0k Ω 2.0k Ω 0 Ω ∞ Ω

🚨 Banned Alarm Supervision Anti-Patterns

Anti-Pattern Manifestation Mandatory Production Counter-Rule
Panel-Terminal Stacking Resistors crimped into panel screw terminals Install resistors strictly inside remote detector casing.
Vendor Value Cross-Contamination Putting 2.0k Honeywell onto DSC 5.6k panel Enforce manufacturer-specific nominal resistor standards.
DEOL Series/Parallel Swap Inverting resistor positions on alarm relay R_ALARM across NC relay; R_EOL in series with loop.
Wire Drop Neglect Ignoring resistance on 200m runs Calculate two-conductor copper resistance: $2 \times D \times \rho$.