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To Test Occupancy Sensors
1. Ensure the Time Delay is set for Test Mode* using the "Test Mode/20 minutes"
setting (DIP Switches 1,2 & 3 are OFF.
2. Ensure that the Ultrasonic Sensitivity trimpot is set to about 70%, clockwise.
3. Ensure that the Light Level is at default (maximum). See the Light Level Feature
section of this document for instructions.
4. Remain still. The green LED should not flash. The lights should turn off after 5
seconds. (If not, see "Troubleshooting.")
5. Move about the coverage area. The lights should come ON. Adjust the
Ultrasonic Sensitivity as necessary to provide the desired coverage (Green LED
indicates activation from the ultrasonic sensor).
When testing and adjustment is complete, reset DIP Switches to the desired settings, and replace the cover on the sensor.
*Test Mode is a temporary state that starts when you first set the sensor's DIP Switches for the "Test Mode/20 minutes" (Switches 1, 2,
3 OFF). If you need to invoke the Test Mode and the DIP Switches are already set for Test Mode/20 minutes, toggle DIP Switch 1 ON,
then back to the OFF position. This provides a 10 minute test period. During the test period, the Time Delay is only 5 seconds.
The UT-355 has 5 DIP Switches under the cover.
Time Delay: Switches 1, 2, 3
The sensor will hold the lights ON as long as occupancy is detected. The time delay countdown starts when no
motion is detected. After no motion is detected for the length of the time delay, the sensor will turn the lights OFF.
Walk Through: Switch 4
Walk-through mode turns the lights OFF three minutes after the area is initially occupied, if no motion is detected
after the first 30 seconds. If motion continues beyond the first 30 seconds, the selected time delay applies.
Service: Switch 5
To override all sensor functions, set DIP Switch 5 to the ON position. The green LED will come on and stay on
for the duration of the override. This bypasses the light level and occupancy detection control functions of the
sensor.
The Light Level feature holds lights off upon initial occupancy if adequate ambient light exists. It will not turn the lights OFF if they are
ON. The default setting is for maximum, meaning that even the brightest ambient light will not hold the lights OFF.
Notes on Functionality
• Avoid mounting the sensor close to lighting fixtures.
• Adjust during daylight hours when ambient light in the area is at desired level.
• Light Level cannot be enabled while Test Mode is active.
Either wait for Test Mode to expire or select any of the other Time Delay settings before enabling the Light Level feature.
• The ultrasonic occupancy indicator LED is disabled when the Light Level feature is enabled.
LED will also flash periodically to indicate the sensor has Light Level enabled.
• Light Level settings are only saved in the event of a power loss.
Disabling Light Level and then reenabling it will not return it to previous settings.
• If Test Mode is enabled after Light Level has been set, Light Level functionality will cease to function throughout the duration of Test
Mode. When Test Mode period expires, the Light Level functionality will resume, even if the Dip Switches remain set to Test Mode.
Setting Light Level
1. Make sure Test Mode is not active.
2. Toggle the state of the sensor, by briefly pressing the Light Level button, to include or exclude the lighting load from the light level
calibration.
3. Open the Front Cover and locate the Light Level pusbbutton. See Sensor Adjustment.
4. Press and hold the Light Level button between 2s and 5s.
The green LED will be ON showing 2s is reached and then be OFF showing 5s has passed.* The sensor enters setup mode, as
indicated by the rapidly flashing LED. The LED will flash throughout the setup process. Occupancy indications from the LED is
disabled during setup.
5. Move away from the sensor to avoid interference with light level detection. The sensor measures the light level for a 10 second
period, then averages the readings and automatically sets the level that will be used as the new setting. The sensor will hold lights
OFF when the ambient light exceeds this setting.
6. When the LED stops flashing, replace the Front Cover.
*Disabling Light Level
Press and hold the Light Level button over 5s (the green LED will be ON and then OFF). After pushbutton is released, the LED will flash
quickly for about 10s. The light level will be set to its default value (maximum)
DIP SWITCH SETTING
LIGHT LEVEL FEATURE
3
Feature
Switch#
Time Delay
1 2 3
Test Mode/20 min
30 seconds
5 minutes
10 minutes
15 minutes
20 minutes
25 minutes
30 minutes
Walk-Through
4
Enabled
Disabled
5
Service
Service
Normal
= Factory Setting
= ON
= OFF
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