Williamson SilverU Serie Guía Del Operario página 3

Distance anD spot size
The size of the area (spot size) to be measured determines the distance between the
sensor and the target. The spot size must not be larger than the target. The sensor
should be mounted so that the measured spot size is smaller than the target.
aMbient teMperature
The sensor is designed to operate in ambient temperatures from 32°F to 158°F (0°C
to 70°C). For ambient temperatures above 70°C, an air/water-cooled housing will be
required.
Avoid thermal shock. Allow 20 minutes for the unit to adjust to large changes in ambi-
ent temperature.
atMospheric Quality
Smoke, fumes or dust can contaminate the lens and cause errors in temperature
measurement. In these types of environment the air purge collar should be used to
help keep the lens clean.
electrical interference
To minimise electromagnetic interference or 'noise', the sensor should be mounted
away from motors, generators and such like.
WirinG
Check the distance between the sensor and the indicating/controlling device. If neces-
sary, the SilverU sensor can be ordered with a longer cable attached.
poWer supply
Be sure to use a 24Vdc, (20mA) power supply.
mecHanical inStallation
All sensors come with a 3ft (1m) cable and a mounting nut. The sensor can be
mounted on brackets or cut outs of your own design, or you can use the fixed and
adjustable mounting bracket accessories which are shown below.
Fixed Bracket
Ø0 8
(Ø20 0)
0 5
(12 0)
1 8
(45 0)
1 0
2 0 (50 0)
(25 0)
2 x Mounting Holes #6 Clearance
0 9 (24 0)
0 35
(9 0
60° Rotation
Legend = inches (millimeters)
›
4
Adjustable Bracket
0 6
(15 0)
0 35
(9 0)
1 6 (40 0)
1 0
2 0
(25 0)
(50 0)
1 9
(48 0)
2 x Mounting Holes #6 Clearance
0 9 (24 0)
0 35
(9 0)
60° Rotation
air/Water cooleD housinG
The air/water cooled housing shown below allows the sensor to withstand high ambient
temperatures. It is equipped with two 1/8" NPT fittings with 1/8" BSP fittings available as
an option. Water temperature should be 50°F (10°C) to 80°F (27°C) for efficient cooling.
Chilled water below 50°F (10°C) is not recommended. To avoid condensation, the air
purge collar should be used with the water-cooled housing.
Air Purge Co lar
1.0 (26.0)
1.3 (34.0)
1.85 (47.0)
Legend = inches (millimeters)
air purGe collar
The air purge collar below is used to keep dust, fumes, moisture, and other contami-
nants away from the lens. It must be screwed in fully. Air flows into the 1/8" NPT fitting
(1/8" BSP is available as an option) and out of the front aperture. Air flow should be
no more than 1 to 3 cfm (0.5 to 1.5 litres/sec).
Clean or 'instrument' air is recommended.
60° Rotat on
Legend = inches (millimeters)
1/8 NPT Water/Air Connections
2.3 (58.5) 3.2 (81.0)
1/8 NPT Air connection
1.1 (27)
2.3 (58.5)
Water/Air Coo ing Jacket
1.0 (26)
1.3 (34)
1.85 (47)
5