APP855 THERMOMETER
Page 2
INSTALLATION & OPERATION
MATERIALS.
Standard stainless steel bulbs and thermowells are suitable for air, oil, water and other non-corrosive
fluids. HVAC Thermometers must be used with their brass or stainless steel thermowell.
For corrosive fluids, alternative materials e.g. PTFE and Hastalloy etc. should be specified.
Environmental conditions should be taken into account when considering suitable materials for cases,
capillary etc.
AMBIENT TEMPERATURE.
Instruments are designed to operate in ambient temperatures of-10 to + 50°C. The housing has been
equipped with a bimetal temperature compensation. The instrument head and capillary should be
protected from localised heal or cold sources as this can lead to indicating errors
THERMOWELLS.
The use of thermowells is recommended in all applications.
The correct specification for thermowells is dependent upon a number of factors (e.g. temperature
flow medium, vibration etc.) and it is recommended each application be discussed with SM Gauge Co.
to ensure correct selection.
INSTALLATION.
Care must be taken to ensure that the bulb is not damaged during installation. Do not attempt to bend
bulb. The sensing bulb should be totally immersed in the medium which is being measured If a
thermowell is being used, the heat transfer delay can be improved by filling the thermowell with heat
transfer substance. When fitting the bulb into a thermowell it is essential the bulb is not forced against
the bottom of the thermowell when tightening the nut. This can lead to increase in pressure within the
bulb and cause incorrect readings. The bulb should be inserted into the thermowell until it bottoms
and then withdrawn approximately 5 mm before tightening compression nut to hand tight plus quarter
turn. Check capillary is correct length by laying along proposed route. Never attempt to stretch
capillary as this will lead to fracture of the system.
The capillary should be securely supported and clipped to wall or other solid surface and must be free
from buckling and twists and have minimum bending radius of 60mm. Particular care should be taken
at the points where the capillary enters the case and the bulb. Excess capillary should be coiled and
arranged in free swinging loops between the last fixing point and the bulb.
Do not tighten instrument into the system by grasping the case, as any distortion created will lead to
calibration errors. Instrument heads should be mounted in the vertical position unless calibrated
accordingly.
VIBRATION.
A temperature indicator should be installed in a vibration free area. The instrument might exhibit
excessive wear on the bearing surfaces of the movement if not. Glycerine filling maybe an option,
consult the SM Gauge Co.
THREADS AND JOINTING.
Care must be taken to ensure mismatch of threads does not occur. Mating female connections must
have a pressure rating that is compatible with the pressure rating of the instrument.
MAINTENANCE.
The function of the gauge does not require any special maintenance procedures but frequent checks
must be made to ensure that the instrument is still working correctly and accurately. Any shift in
temperature readings greater than twice the tolerance of the instrument must be investigated and the
immediate replacement of the gauge if it is faulty.
CALIBRATION AND REPAIR.
The repair and calibration of the instrument should be undertaken by competent personnel, who have
at their disposal the necessary facilities. If not, they should be returned to SM Gauge Co. For repair
and/or calibration.
STORAGE.
Instruments should be stored in dry, clean conditions and care should be taken to ensure the ambient
temperature does not exceed or fall below the measuring range of the instruments. They must be
protected against any impact damage.
TRANSPORT.
Although care is taken in packing these instruments for shipment it is possible they can sustain transit
damage. They should be checked for damage before use.
Содержание Reavell 5236
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