LMD222 and LMD224 Series
Operations Manual
Eberle Design Inc.
Page 9
Section 4
Specifications
4.1 MECHANICAL
Height ......................................................................................................... 4.50 inches
LMD222 Width ........................................................................................... 1.14 inches
LMD224 Width ........................................................................................... 2.34 inches
Depth (excluding handle) ...........................................................................6.875 inches
4.2 ENVIRONMENTAL
Storage Temperature Range ................................................................... -45 to +85
o
C
Operating Temperature Range ................................................................ -34 to +74
o
C
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
Optically Isolated Solid State Outputs
True (low, 50 mA) .......................................................................less than 1.5 Vdc
Maximum Leakage Current (DC Supply = 24Vdc) .......................................... 1 uA
Maximum Current (low) ............................................................................ 100 mA
Relay Outputs
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 over 1,000 feet 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.
