ULT-
PLG™ Operating Instructions
4
Document no.
10180904
Operation
Power up
Upon power up the detector initializes by automatically tuning to the loop. The green LED
indicates that the detector is powered and operational.
Frequency setting
The operating frequency of the loop is a function of the specific loop inductance and DIP
switch settings 1 and 2. The primary purpose of the frequency setting is to allow the
installer the ability to set different operating frequencies for multi-loop installations,
recommended to prevent crosstalk/interference from adjacent loops. After changing the
frequency setting, press the
Frequency Count switch
to re-initialize the detector. To check
the operating frequency of a loop, refer to the
Frequency Count
section. To determine
whether crosstalk between adjacent loops is occurring, refer to the UltraMETER™ Sensitivity
Display section.
UltraMETER™ Sensitivity Display
The
UltraMETER™ sensitivity display
simplifies the installation process by displaying the
sensitivity setting required to detect a vehicle on the loop. To use this feature, observe the
display while a vehicle is moving into position on the loop, note the number displayed, then
adjust the
sensitivity setting
(rotary switch) to the displayed position.
During normal operation, when a vehicle is not on the loop, the display is blank. The
effects of crosstalk or other interference can be observed on the display when the loop is
vacant. Interference or crosstalk will cause the display to indicate a level, typically 8 or 9. It
may be necessary to observe the display for a minute or so to see this effect. Change the
frequency setting
to prevent crosstalk.
Sensitivity setting
The 10-position rotary switch allows for precise adjustment of detection level. The sensitivity
level increases from position 0 thru 9 with position 0 being the lowest sensitivity. Typical
applications require a setting of 3 or 4. The UltraMETER™ sensitivity display simplifies the
installation process by displaying the sensitivity setting required to detect a vehicle on the loop.
To use this feature, observe the display while a vehicle is moving into position on the loop, note
the number displayed, then adjust the sensitivity setting (rotary switch) to the displayed
position.
