Reno A & E Model K User Manual
K Series
PC Board Type Single Channel Detector
• 24 VAC and 120 VAC versions available
• Fail-Safe and Fail-Secure versions available
• Dual Relay outputs:
• Output A:
• Limited Presence
• True Presence™
• Output B:
• Presence (Duplicates Output A)
• Pulse-on-Entry
• Pulse-on-Exit
• Fault Output
• Two second delay of Outputs A and B
• Sensitivity Boost, for gate operation where high-bed
vehicles might be encountered
• Detect memory feature maintains detection during
momentary power interruptions of up to two seconds
• Three super bright LEDs provide separate indications
of Power, Detect, and Loop Fail conditions
• Fail LED provides an indication of current loop failures
or loop failures that have occurred
• Rotary switch selects one of eight sensitivity levels
• DIP switches select one of four loop frequencies
®
Ordering Information:
Model K -XXX - X
Blank = Fail-Safe, S = Fail-Secure
24 or 120: 24 = 24 VAC input power, 120 = 120 VAC input power
The Model K is a single channel, dual output, PC Board type vehicle detector that incorporates the reliable
vehicle detection technology found in all of Reno A & E’s vehicle detectors. All detector functions and settings
are easy to congure using a set of eight external DIP switches and a simple to use eight-position rotary switch.
Available in 24 VAC and 120 VAC congurations, the Model K is a full featured detector in a compact package.
3510 E. ATLANTA AVENUE, PHOENIX AZ 85040 +1.480.968.6407 EDITRAFFIC.COM
K Series Specications
This is a Performance Specication. It is not intended to be used as Operating Instructions.
Loop Frequency: Four (4) operating frequencies (normally in the range of 20 to 100 kilohertz) are
selectable by means of two PC board mounted DIP switches.
Sensitivity: Eight (8) detection sensitivity levels are selectable by means of a PC board mounted rotary
switch. Vehicle detection results from a sufcient negative change in loop inductance (-∆L/L). (See
SENSITIVITY, -∆L/L table.)
Sensitivity Boost: A PC board mounted DIP switch may be turned on to increase sensitivity only
during the Detect State. When a vehicle enters the loop detection zone, the detector sensitivity is
automatically boosted to a higher lever than the vacant loop setting. The boosted sensitivity remains
throughout the Detect State. When the vehicle leaves the loop detection zone, the sensitivity
immediately returns to the vacant loop setting. This feature is particularly useful in preventing drop-outs
during the passage of high bed vehicles.
Output A Presence Modes: Output A has two presence hold times that are selectable by means of a
PC board mounted DIP switch; True Presence™ and Limited Presence. Both modes provide a Detect
output when a vehicle is present in the loop detection zone. Limited Presence will typically hold Output
A in the Detect state for one to three hours. True Presence™ will hold Output A in the Detect state as
long as the vehicle is present in the loop detection zone and power is not removed or reset applied.
True Presence™ time applies only for normal size automobiles and trucks and for normal size loops
(approximately 12 to 120 sq. ft.).
Output B Modes of Operation: Output B has four modes of operation that are selected by three
PC board mounted DIP switches; Presence, Pulse-on-Entry, Pulse-on-Exit, or Fault. When operating in
Presence mode, the presence hold time is the same as Output A. When set to operate in Pulse mode,
the 250 millisecond pulse can be set to occur when the vehicle enters the loop detection zone (Pulseon-Entry) or when the vehicle leaves the loop detection zone (Pulse-on-Exit). When operating in Fault
mode, Output B will provide a fault indication when a loop fault exists. Output B is a Fail-Secure output
in either Presence or Pulse mode.
Fail-Safe / Fail-Secure Operation: The detector is factory congured for Fail-Safe or Fail-Secure
operation. When the detector is congured to operate in Fail-Safe mode, Output A will assume the
Detect output state (Relay A Normally Open contacts closed, Relay A Normally Closed contacts open)
during a power loss or loop fault condition. When the detector is congured to operate in Fail-Secure
mode, Output A will not respond to power losses or loop failures (Relay A Normally Open contacts
open, Relay A Normally Closed contacts closed). Output B will always assume a No Detect state during
a power loss or loop fault condition (Relay B Normally Open contacts open, Relay B Normally Closed
contacts closed).
Call Delay: A two second delay of Outputs A and B can be activated by setting a PC board mounted DIP
switch. Output delay is the time the detector outputs are delayed after a vehicle rst enters the loop
detection zone. If the Delay feature is activated, the outputs will only be turned on after the two second
delay time has passed with a vehicle continuously present in the loop detection zone. If a vehicle leaves
the loop detection zone during the delay interval, detection is aborted and the next vehicle to enter the
loop detection zone will initiate a new full two second delay interval. By ashing the Detect LED at a
four Hz rate with a 50% duty cycle, the detector indicates that a vehicle is being detected but that the
outputs are being delayed.
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 ashing 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 ashing at a one Hz rate (Shorted Loop). If and when the loop
returns to an in tolerance state, the FAIL LED will ash at a three Hz rate to indicate an intermittent loop
fault has occurred and has been corrected. This ash rate will continue until another loop fault occurs,
the detector is reset, or the detector loses power.
Detector Reset: Changing the position of any DIP Switch (except the Frequency DIP switches) or the
Sensitivity Level setting will reset the detector. After changing the Frequency selection switches (DIP
switches 1 & 2), the detector must be 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, or a 10 microfarad
capacitor charged to 1,000 volts being discharged between either loop terminal and earth (chassis)
ground.
Electrical Isolation: The loop is isolated by means of the loop isolation transformer. The outputs
are isolated by means of the output relays. The power inputs are isolated by means of the power
transformer.
Automatic Fuse Protection: If 120 VAC power is applied to a Model K-24, an integral automatic fuse
will open to protect the detector from damage due to excess voltage. The fuse will automatically
reset when power is removed for a period of three seconds or longer.
Relay Outputs: Rated for maximum continuous current of 6.0 amps, 300 VAC maximum, 150 VDC
maximum, and 180 Watts maximum switched power.
Power: 24 VAC version (K-24): 18 to 32 VAC, 4 Watts maximum. 120 VAC version (K-120): 89 to 135
VAC, 4 Watts maximum.
Ruggedized Construction: PC board mounted components are protected by a cover 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. Circuit board and components are conformal coated
with polyurethane.
Operating Temperature: -30ºF to +180ºF (-34ºC to +82ºC).
Connector: 10 pin, in-line male. Molex P/N 26-61-4100. (See PIN ASSIGNMENTS table.)
Size: 4.50 inches (11.43 cm) high x 3.20 inches (8.13 cm) wide x 1.15 inches (2.92 cm) deep.
Weight: 6.1 oz (172.9 gm).
Sensitivity, & -∆L/L
Sensitivity -∆L/L
0 1.28%
1 0.64%
2 0.32%
3 0.16%
4 0.08%
5 0.04%
6 0.02%
7 0.01%
Note: Changing the sensitivity setting will reset the detector.
Switch ON OFF Factory Default
1 Output B Presence Output B Pulse OFF
2 Output B Pulse-on-exit Output B Pulse-on-entry OFF
3 Output B Fault Output B Presence/Pulse OFF
4 Two Second Call Delay No Delay OFF
5 Sensitivity Boost No Boost OFF
6 Limited Presence TruePresence™ OFF
7 Four (4) Frequency Selections ON
8 OFF
Pin Function
1 Relay B Common
2 Relay B Normally Open
3 Relay B Normally Closed
4 Relay A Common
5 Relay A Normally Closed
6 Relay A Normally Open
7 AC Neutral
8 AC Line
9 Loop
10 Loop
Factory Default Settings
Pin Assignments
Model K Series (551-1101-00) 03/23/2020
© COPYRIGHT 2020. Eberle Design, Inc. All Rights Reserved.
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