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4.1 MECHANICAL

Height ............................................................................................................... 4.50 inches

LMD622 (H, T) Width ...................................................................................... 1.14 inches

LMD624 (T) Width .......................................................................................... 2.34 inches

Depth (excluding handle) .............................................................................. 6.875 inches

4.2 ENVIRONMENTAL

Storage Temperature Range ...................................................................... -45 to +85

Operating Temperature Range ................................................................... -34 to +74

Humidity Range (non-condensing) ....................................................... 0 to 95% Relative

4.3 ELECTRICAL

DC Supply Voltage Minimum ............................................................................... 10.8 Vdc

DC Supply Voltage Maximum .............................................................................. 28.8 Vdc

DC Supply Current ............................................................................... 100 mA Maximum

DC Inputs

True (low)........................................................................................... less than 8 Vdc

False (high) ................................................................................. greater than 16 Vdc

Optically Isolated Solid State Outputs

True (low, 50 mA) ........................................................................... less than 1.5 Vdc

Maximum Leakage Current (DC Supply = 24Vdc) ........................................ 150 uA

Maximum Current (low) ................................................................................. 100 mA

Relay Outputs (optional)

AC Contact Rating.............................................................................. 5A @ 120 Vac

DC Contact Rating ............................................................................... 5A @ 30 Vdc

4.4 TUNING

4.4.1 LOOP INDUCTANCE (TUNING) RANGE

The detector will automatically tune to a loop and lead-in combination within the tuning

range of 20 to 2500 microHenry with a Q factor greater than 5.

4.4.2 ENVIRONMENTAL TRACKING

The detector automatically and continuously compensates for component drift and

environmental effects throughout the tuning range and across the entire temperature range.

4.4.3 GROUNDED LOOP OPERATION

Each detector channel will operate when connected to poor quality loops including those

that have a short to ground at a single point.

4.4.4 LEAD-IN LENGTH

The unit will operate with lead-in (feeder) lengths up to 5,000 feet (1,524 m.) with

appropriate loops and proper lead-in cable.

4.5 LOOP INPUT (LIGHTNING PROTECTION)

The loop input incorporates lightning and transient protection devices and the loop

oscillator circuitry is transformer-isolated for each channel. The lightning protection will

withstand the discharge of a 10uF capacitor charged to 2,000V across the loop inputs or

between a loop input and Earth Ground for each channel. The transformer isolation allows

operation with a loop which is grounded at a single point.

Eberle Design Inc.

LMD622 and LMD624 Series

Operations Manual

Section 4

Specifications

Page 10