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Download PDFSurface Patrol
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 | A non-contact infrared sensor in an injection molded housing that is
mounted under the vehicle and scans the pavement as the vehicle passes over
it.
| An ambient temperature sensor that can be mounted anywhere desired on the
vehicle.
| A dashboard-mounted digital meter that displays the surface temperature as
well as ambient (air) temperature to the operator. | |
QTT Inc. has been producing infrared surface temperature sensors since 1991; longer than any other company. Our customers include Airport Operators, Cities, Counties, Municipalities and state DOT's who are using the units to detect possible icing conditions on runways, taxiways and highways. In doing so, they have experienced more efficient and effective use of sand, salt and de-icing chemicals.
This motor vehicle mounted, non-contact measurement system continuously monitors the road surface temperature to detect dangerous cold-weather driving conditions. The electronic design of this system provides compensation for the effects of ambient temperature changes which would otherwise result in inaccurate measurements. The digital display output covers a surface temperature range of -40°F to +200°F (-40°C to +90°C).
The objective of the QTT system is to continuously monitor road surface temperatures from vehicle moving at normal highway speeds. the provides the operator instantaneous feedback on road surface conditions and an early alert to possible icing conditions.
The higher thermal conductivity of bridges, culverts and other similar surface variations may freeze and subsequently thaw before surrounding road surfaces. When ambient temperatures are near freezing, road surface temperatures can be substantially different, presenting continuously changing driving hazards. The new QTT 999J System alerts the driver that these conditions exist. This dual temperature model also displays the ambient temperature as well as the surface temperature.
The 999J Surface Patrol system is a compact instrument designed for easy installation. The sensor head plugs directly into the meter which then provides a digital display of the current temperatures.
Utilizing the latest in electronic and thermal technology, the rugged and compact sensing head converts heat-generated infrared energy into electrical signals which are then translated into calibrated temperature information which is then displayed.
Mechanical installation requires mounting the sensor on the underside of the vehicle. The sensor includes a conical mounting and adjustment assembly to protect the sensor from dirt, water, road debris and vehicle vibration. The meter powers the sensor and requires 12 or 24 volts D.C.
To operate, simply switch on the vehicle ignition and the system is operational. Maintenance is limited to periodic cleaning of the optical lens within the sensor housing. The frequency of this maintenance is dependent on the operational environment. To clean the lens, unscrew the tube on the bottom of the vehicle-mounted sensor housing and wipe with a tissue dampened with a lens cleaning solution then wipe dry.
| Sensor Assembly | Injection molded housing with lens protective cone | |
| Accuracy | ±0.5°F for operating ambient temperatures from 0-120°F | |
| Repeatability | ±0.1% of full scale | |
| Shock | 50 G's | |
| Vibration | 10 G's in any axis | |
| Response time | 80 milliseconds to 95% of final reading | |
| RF Hardening | Withstands external radio frequency effects caused by mobile radios | |
| Maximum measurement region | 1 inch (2.54cm) O.D. | |
| Operating Ambient Temperature | -40°F to +160°F (-40°C to 70°C) | |
| Supply Voltage | 12 or 24 VDC ±25%, 150mA max | |
| Optics | Precision Germanium Crystal | |
| Weight | Sensor alone: 2oz (60g) | |
| w/cables & connectors: 10oz (280g) | ||
| Meter Assembly | High brightness red LEDs. Displays both Surface & Ambient temperatures in Fahrenheit or Celsius | |
| Field calibration | Adjustable ±5°F over ice | |
| Weight | 4.5 oz (128 g) | |
| Meter Options | Analog or Serial Output | |
| Analog Output Modes | Voltage or Current loop | |
| Analog Voltage Range | 1.00-5.00V, isolated. User programmable gain and offset | |
| Analog Current Loop | 4.00-20.00mA, isolated. User programmable gain and offset. | |
| Loop power | Internal (isolated) or external | |
| Serial Output | EIA/RS-232C, 300-9600bps | |
| General | ||
| Electrical Connections | Compression terminals for input voltage | |
| Quick disconnect watertight circular system connector | ||
| Data Standards | SAE J1708 and J1587 | |
| Cable Length | 18 feet (8.5 m) standard | |
Long-term accuracy not to be affected by harsh winter weather conditions including severe splashing of snow, slush, mud and water.
