Blank = Fail-Safe, S = Fail-Secure
3, 4, or 8: 3 = 120 VAC Input Power
4 = 12 VDC, 24 VDC, or 24 VAC Input Power
8 = 240 VAC Input Power
Loop Frequency: Four (4) operating frequencies (normally in the range of 20 to 100 kilohertz) are selectable by means of two front panel mounted DIP switches.
Sensitivity: Four (4) detection sensitivity levels are selectable by means of two front panel mounted DIP switches. Vehicle detection results from a sufficient negative change in loop inductance.
Sensitivity Boost: A front panel mounted DIP switch may be turned on to increase sensitivity during the Detect State. When a vehicle enters the loop detection zone, the detector sensitivity is automatically boosted to a higher level than the vacant loop setting.
Presence / Pulse Modes: The detector output has two modes of operation that are selectable by means of a front panel mounted DIP switch; Presence and Pulse.
Detector Output Presence Hold Times / Pulse Modes: An internal DIP switch can be used to select the detector output presence hold time or pulse mode. When set to operate in Presence mode, the internal DIP switch can be used to select one of two presence hold times; Limited Presence or True Presence.
Fail-Safe / Fail-Secure Operation: The detector is factory configured for Fail-Safe or Fail-Secure operation. When the detector is configured to operate in Fail-Safe mode, the output will assume a Detect output state (relay Normally Open contacts closed, relay Normally Closed contacts open) during a power loss or loop fault condition.
Call Delay: A two second delay of the detector output can be activated by setting an internal DIP switch. Output delay is the time the detector output is delayed after a vehicle first enters the loop detection zone. If the Delay feature is activated, the output will only be turned on after the two second delay time has passed with a vehicle continuously present in the loop detection zone
Power Indicator: The green Power LED is Off when the detector has no power supplied or when the power level is below 75% of its nominal value. The Power LED is On when the detector is being supplied with a suitable level of power
Detect Indicator: The red Detect LED is Off when the loop detection zone is vacant. The Detect LED is On when a vehicle is being detected. The Detect LED flashing at a four Hz rate with a 50% duty cycle indicates that the delay interval is currently timing.
Fail Indicator: The red Fail LED indicates whether or not the loop is currently within tolerance. If the loop is within tolerance, the Fail LED will be Off. If out of tolerance, the LED indicates a current loop failure by turning On (Open Loop) or flashing at a one Hz rate (Shorted Loop).
Detector Reset: Changing the position of any DIP Switch (except the Frequency DIP switches) will reset the detector. The detector can also be reset by pressing the front panel mounted pushbutton labled RESET.
Detect Memory: The Detect State of the detector is maintained during momentary power interruptions of up to two seconds.
Self Tuning: The detector automatically tunes and is operational within two seconds after application of power or after being reset. Full sensitivity and hold time requires 30 seconds of operation.
Environmental & Tracking: The detector is 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 2000 microhenries with a Q factor of 5 or greater.
Loop Feeder Length: Up to 2500 feet (762 m) maximum with proper feeder cable and appropriate loops.
Loop Input: Transformer isolated. The minimum capacitance added by the detector is 0.068 microfarad.
Grounded Loop Operation: The loop isolation transformer allows operation with poor quality loops (which may include one short to ground at a single point).
Lightning Protection: The detector can tolerate, without damage, a 10 microfarad capacitor charged to 1,000 volts being discharged directly into the loop input terminals.
Electrical Isolation: The loop is isolated by means of the loop isolation transformer. The outputs are isolated by means of the output relays.
Relay Output: Rated for maximum continuous current of 6.0 amps, 300 VAC maximum, 150 VDC maximum, and 180 Watts maximum switched power.
Power: 120 VAC version (AX-3): 89 to 135 VAC, 4 Watts maximum.
240 VAC version (AX-8): 180 to 270 VAC, 4 Watts maximum.
12 VDC / 24 VDC / 24 VAC version (AX-4): 10 to 16 VDC, 80 milliamps maximum / 20 to 34 VDC, 50 milliamps maximum / 18 to 32 VAC, 4 Watts maximum.
Ruggedized Construction: The detector enclosure is made from a high temperature rated plastic. Printed circuit boards are 0.062 inch thick FR4 material with 2 oz. copper on both sides and plated through holes.
Operating Temperature: -30º F to +180º F (-34º C to +82º C).
Connector: Rear mounted 11 Pin Amphenol connector (See PIN ASSIGNMENTS table.)
Size: 2.50 inches (6.35 cm) high x 1.55 inches (3.94 cm) wide x 3.50 inches (8.89 cm) deep (excluding connector).
Weight: 7.6 oz (215.5 gm).