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3.
SET UP
3.1
Installing/changing the battery
3.1.1
On either side of the red trigger, where the light grey handle moulding meets the the dark grey
main body there are two very shallow recesses. Place thumb and finger into these recesses
and pull the front section of the handle forward and down to reveal the battery compartment as
shown in fig.2.
3.1.2
Attach the battery connector to the battery terminals and place the battery into the battery
compartment making sure that the connection leads will not foul the cover when it is closed.
3.1.3
When the ‘battery low’ indicator appears on the display replace the battery immediately.
DISPLAY INFORMATION
1. Digital readout
2. Temperature
C (Celcius)
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3. Temperature
F (Fahrenheit)
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4. Measuring indicator (scanning)
5. Data hold indicator
6. Low battery indicator
7. Laser on indicator
8. Fixed emissivity (0.95)
4.
OPERATION
4.1
How the unit functions.
The infrared thermometer measures the surface temperature of an object. The unit’s optics sense emitted, reflected and transmitted
energy which is collected and focused onto a detector. The unit’s electronics translate the information into a temperature reading
which appears on the LCD display. The laser is for aiming purposes only and plays no part in the temperature measurement.
4.2
Field of view.
The units field of view is 8:1. This means
that if the unit is positioned 8” (200mm)
from the target the diameter of the object
under test must be at least 1” (25mm).
Refer to the diagram opposite and to the
printed symbol on the side of the unit. As
a general rule make sure that the target is
larger that the relevant spot size. The
smaller the spot size the closer you should
be to the target. When accuracy is critical,
make sure that the target is twice as large
as the spot size.
4.3.
Locating a hot spot. To find a hot spot
aim the thermometer outside the area of interest, then scan across with an up and down motion until you locate a hot spot.
4.4.
Emissivity. Different materials and surfaces have different energy emitting characteristics (emissivity) but most organic materials and
painted or oxidised surfaces are similar in this respect and the thermometer is designed to give correct readings for these materials
and surfaces (Emissivity 0.95). To maintain accurate measurement, shiny or polished metal surfaces should be covered in masking tape or
matt black paint before using the thermometer. Allow time for the tape/paint to attain the same temperature as the material beneath.
4.5.
Obstructions. The thermometer cannot read the temperature of a target through glass or plastic sheet. It will only show the surface
temperature of the sheet. Similarly, steam, dust or smoke will result in erroneous readings.
4.6.
OPERATING THE THERMOMETER
4.6.1
Hold the meter by its handle grip and point it towards the surface to be measured.
4.6.2
Pull and hold the trigger to turn the meter on and begin measuring. The display will come on and the ‘SCAN’ display icon will appear
in the top left hand corner of the LCD display.
4.6.3
While continuing to hold the trigger in the ‘on’ position the following facilities can be used,
a) Push the red button to turn on the laser pointer. When the laser is ‘on’ the triangular laser icon will appear on the LCD display over
the temperature reading. Aim the red beam approximately 16mm (5/8”) above the point of test. (To turn the pointer ‘off’ press the red
button again.)
b) Select the temperature units using the C
c) Push the backlight button to turn on the LCD backlight.
4.6.4
Once the trigger has been released the information on the LCD will remain for 7 seconds before the unit automatically powers down.
( Whilst the information remains on the display the ‘HOLD’ icon will be displayed.)
5.
APPLICATIONS
WARNING! When working on vehicle systems, take all the precautions necessary to ensure the safety of yourself and others - always
F
refer to vehicle manufacturer’s handbook/service manual. The purpose of this tool dictates that it will be used close to very hot equipment
and therefore extreme care should be exercised.
5.1.
Air Conditioning
With the air conditioning set to maximum cooling, the temperature of the output air should be at least 15
ambient once the system has stabilised. Do not place the thermometer directly in the cold air stream (thermal shock) but rather hold it
to one side and take the temperature of the air duct. If the air temperature differential is less than 15
5.2.
Heater
With the engine running, and at normal operating temperature, A/C ‘off’ and heater controls ‘on’ measure the temperatures of the
heater inlet and outlet hoses/pipes at the engine compartment bulkhead. The outlet hose/pipe should be approximately 10
the inlet. If the differential is significantly more than this the flow through the heater core is restricted and the system should be investigated.
& F
buttons.
O
O
fig. 2
fig. 3
C colder than the outside
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C have the A/C system checked.
O
C cooler than
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VS900.V2 - 2 - 090304
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