Loop Frequency: Four frequencies (normally in the range of 20 to  

100 kHz) are dip switch selectable.

Reset:  Changing any dip switch position (except SW 7 & SW 8: frequency selection) will reset the detector. After changing the Frequency selection switches, the detector will require a RESET. Reset will clear the loop fault memory.

Sensitivity: Vehicle detection results when a negative change in loop inductance (-DL/L) exceeds the sensitivity setting. Eight detection sensitivity levels are rotary switch selectable.

Sensitivity Boost:  A dip switch setting may be turned on to increase sensitivity during the detect period. When a vehicle enters the loop, the detector sensitivity is boosted to a higher level than the vacant loop setting. The boosted sensitivity remains throughout the detect period. When the vehicle leaves the loop, the sensitivity returns to the vacant loop setting. This feature helps prevent dropouts during the passage of high bed vehicles and is particularly useful in sliding gate situations.

Relay "A" Modes:  Two presence hold times are dip switch selectable for Relay A, "TruePresenceÔ " and "Limited Presence". Both modes output a CALL when a vehicle is present in the loop. TruePresenceÔ will hold the CALL for as long as the vehicle is present and power is not removed or reset applied. Limited presence will typically hold the CALL output for about 1-3 hours. The TruePresenceÔ time applies only for normal size automobiles and trucks and for normal size loops (approx. 12 sq. ft. to 120 sq. ft.).

Relay "B" Modes:  Three modes of operation are dip switch selectable for Relay B, Presence, Pulse, or FAIL. When in the presence mode, the presence hold time is the same as Output A. When in the pulse mode, the 250-millisecond pulse can be selected as either pulse on entry (when a vehicle enters the loop) or pulse on exit (when a vehicle exits the loop). The FAIL mode provides an output for as long as a loop failure exists. Relay B is a FAIL SECURE output in the presence and pulse modes. In the FAIL mode, relay B is fail secure when power fails. A loop failure will generate an output.

Call Delay: A 2-second delay of Outputs A &B can be dip switch activated. Output delay is the time the detector outputs are delayed after a vehicle first enters the loop detection area and is indicated by the front panel detect LED flashing at 4 Hz with a 50% duty cycle. If the 2-second output delay feature is activated, the output relays will only be turned on after 2 seconds has passed with a vehicle continuously present in the loop detection area. If a vehicle leaves the loop detection area during the 2-second delay interval, detection is aborted and the next vehicle entering the loop detection area will initiate a new full 2-second delay interval.

Output CALL Memory:  When power is removed for 2 seconds or less, the detector automatically "remembers" if a vehicle was present over the loop. When power is restored, the detector will continue to output a CALL until the vehicle leaves the loop. (Power loss or dips of 2 seconds or less will not drop the CALL).

Power Status Indicator:  A green super-high-intensity light emitting diode (LED) indicates power status during normal detector operation. When the green (PWR) LED is on the power to the detector is normal. When power drops approximately 20% from nominal, the green LED turns off and the detector remains operational. When power drops approximately 25% from nominal, the green LED is off and the "line" voltage is not sufficient to operate the detector.

Detect Status Indicator:  The red detect LED is steady on while a vehicle is being detected. The detect LED will flash at a 4 Hz rate with a 50% duty cycle while timing out the 2-Second CALL Delay.

Loop FAIL Monitor Indicator: If the total inductance of the detector input network goes out of the range specified for the detector or suddenly changes more than +/-25% the detector will enter FAIL mode. The red FAIL LED will either begin flashing with a 50% duty cycle once per second for a shorted loop condition or will be on continuously for an open loop condition. These indicator conditions will continue until the inductance returns to its previous value at which time the detector output will automatically resume normal operation and the red FAIL LED will flash at a distinctive rate (a burst of 3 flashes once per second) to indicate an intermittent loop fault has occurred and corrected. [The detector input network, consists of the loop or loops plus the feeder cable (lead-in or home run) up to the connector on the detector].

FAIL-SAFE Operation: When the loop fails or power is removed, continuity exists between Common & N.O. for Relay A. Continuity exists between Common & N.C. for Relay B.

FAIL-SECURE Operation:  When the loop fails or power is removed, continuity exists between Common & N.C. for both relays A & B.

Self-Tuning:  Automatically tunes to loop within 2 seconds after application of power or reset. 30 seconds of operation is required before full sensitivity and presence time is reached following application of power or a reset. 

Environmental Tracking:  Fully self-compensating for environmental changes and loop drift over the full temperature range and the entire loop inductance range.

Loop Inductance Range:  20 to 1000 mh with Q factor of 5 or greater.

Loop Input:  Transformer isolated. The minimum capacitance added by the detector is 0.068 mF.

Grounded Loop Operation:  The loop isolation transformer allows operation with poor quality loops (which may include a single point short, or leakage, to ground).

Lightning Protection:  The detector can tolerate, without damage, a 10 mF capacitor charged to 1,000 Volts being discharged directly into the loop input terminals, or a 10 mF capacitor charged to 2,000 Volts being charged between either loop terminal and earth ground.

Internal Circuitry Isolation:  All internal electronic circuitry is isolated from all external circuitry. Power is isolated by means of the power transformer. The loop is isolated by means of the loop isolation transformer. The outputs are isolated be means of the output relays.

Automatic Reset Fuse:  When 120 VAC is applied to 24 VAC models, the automatic internal fuse will open. The fuse will automatically reset when power is removed for 3 seconds. Source voltage should be verified before reinstalling.

Relay Rating(s):  The relay contacts are rated for 10 Amps max, 150 VDC max, 300 VAC max and 180 Watts max switched power.

Construction:  Printed circuit boards are double-sided 2-oz copper with plated through-holes. Circuit boards are conformally coated for environmental protection.

Operating Temperature:   - 40° F to + 180° F.

Size:   4.50 inches (11.43 cm.) high x 3.20 inches (8.13 cm.) wide. The circuit board is 0.065 inches (0.165 cm.) thick, and the maximum height of components on the board is 1.10 inches (2.80 cm.)

Weight:  Approx.       6.1 oz (173 gm).

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