Sensor Installation
Modline 5
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amount of signal reduction that the Series 5R Sensors will tolerate depends upon the Sensor temperature
range and the target temperature. The signal reduction tolerated is less in the bottom portion of the
range. The Sensor will indicate invalid when the measurement is not possible.
3.5.5
Summary
The spot size and target size relationship is not as critical for Series 5R Sensors which use the two color
ratio method. Avoid emitted radiation from objects in the same field of view (cone of vision) either in
the foreground or behind the target that are at temperatures hotter than the target. Reflected or emitted
radiation from these interferences can cause measurement errors. Significantly cooler objects, well
below the target temperature, will not cause measurable errors.
For best results, brightness sensors that measure radiation intensity at a single wavelength should be
installed so the target area is larger than the instrument spot size. If possible, adhere to the target size is
twice the spot size rule for all types of instruments.
3.6
Sensor Installation Planning
Mechanical Installation of the Modline 5 Sensor requires determining sighting and focusing
requirements, locations for installing Sensors, accessories and cable routing. Planning also includes
evaluating environmental conditions that may cause contamination of the Sensor optics or overheating
of the Sensor or other Modline 5 components. Re-location of the installation or air purging and water
cooling accessories may be required to overcome adverse conditions.
Pre-focusing the Sensor’s optical system may be necessary if the Sensor is to be mounted in a difficult
location and not accessible. Pre-focus by setting up a well-defined target such as a printed page at the
exact distance of the target, and then lock the rear focusing section.
Setup of the Sensor parameters can also be pre-determined and set before installation.
The following guidelines will help you in planning the Sensor installation.
Mechanical Mounting Location Requirements
The Sensor is installed using the mounting brackets and flanges, air purging and water cooling
accessories illustrated in the Section 3.9
Modline 5 Mounting, Cooling and Air Purging Accessories
Sensor Mounted to Earth Ground Potential
If the proposed mounting surface is at Earth Ground potential, you can mount the housing directly
to this surface. If the surface is not at Earth Ground potential, electrical insulating material and non-
conducting hardware must be used to isolate the Sensors.
Sensor Interconnecting Cable Length
Maximum cable length between the Sensor and the POI Power Supply/Signal Interface Box or
Terminal Plate is 350 ft. (107 m). Maximum temperature rating of the Sensor Interconnecting cable
is 200 °C (392 °F). Plan the cable route accordingly.
Ambient Temperature Limits for Sensor, POI Box and Terminal Strip Plate
The ambient temperature at the mounting locations for the Sensor, POI Power Supply/Signal
Termination Box and The Terminal Strip Plate must be between 0 and 55°C (32 and 130°F).
If the ambient temperature at the mounting location is beyond these limits, precautions must be
taken to protect the Sensor. A WJA Water and Air Cooling Jacket are available for protection against
excessive temperatures. Use of insulation and reflective shielding for additional protection from
