307UM0100_01 May 2016 PD17x User Manual Page 5 of 31
2. Technical Data
2.1 Functional data
Tuning Fully Automatic with the option to enable Automatic Frequency Selection (AFS)
Self-tuning range 20 µH to 1500 µH
Sensitivity Four step adjustable on the DIP switches (High, Medium-High, Medium-Low, Low)
Options available are 0.01% ΔL/L, 0.02% ΔL/L, 0.05% ΔL/L and 0.10% ΔL/L
ASB (Automatic Sensitivity Boost) is selectable via the DIP switches
Frequency With AFS switched on, the channel tunes automatically to one of five possible frequencies
There are four selectable frequency options with AFS switched off
Operating frequency of 18 – 110 kHz (Determined by loop geometry and frequency setting)
Output Configuration 2 output relays
Relay 1 operates as a presence relay, activating on detect
Relay 2 operates as a pulse relay, activating on an event as specified by the switches
Pulse Output Duration User selectable to either 150ms or 250ms
Presence Method Permanent or Limited presence
Presence Time Infinite when the unit is on Permanent Presence
Dependant on level of detect and environmental conditions when on Limited Presence
Drift Compensation Rate Approx. 1 %L/L per minute
Response Times Detect: 53.0 – 73.0ms
Undetect: 280.0 – 350.0ms
Subject to sensitivity level, level of detect and speed of vehicle over the loop
Visual Indications 1 x Power / Status LED – Red
1 x Channel Status LED – Green
Reset Holding the reset button for 3s initiates a retune
Surge protection Loop isolation transformer, gas discharge tubes and Zener diode clamping on loop input
Power Fail Infinite memory retention of detector state on power failure (provided certain criteria are
met refer to section 4.5). This function can be turned on and off via the Reset push button.
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