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ThermoProbe gauging thermometers are considered to be “intrinsically
safe” as originally manufactured. In the event that any
component(s) associated with electrical or electronic portion
of the device fails, there will not be sufficient energy to
cause an ignition while in a flammable atmosphere. The materials
that are used to construct the enclosure and probe assembly
are unlikely to cause a spark if they were ever to contact any
other materials. The materials used are specific stainless steel
and aluminum alloys, and plastics. In addition to the intrinsic
safety of the circuit board and enclosure materials, low resistivity
plastics are used so that static electricity does not accumulate
on any surfaces. Even though all these precautions are taken
and accounted for by the various testing entities, we also include
a bonding (grounding) strap for all our gauging thermometers.
Pumping action in a tank or sloshing in a marine vessel can
cause a difference in electrical potential between the liquid
product and external objects. For this reason the bonding strap
should always be used before any objects are inserted into a
vessel containing flammable contents.
Depending on the particular model ThermoProbe instruments are
tested to these safety standards:
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UL913 (North America) The insignia
for this standard is the (UL Mark) with appropriate markings.
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CSA (North America) The insignia for
this standard is the (CSA) or (ULc) with appropriate markings.
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CENELEC EN 50 020 (Europe) The insignia
for this standard is the (Ex) with appropriate markings.
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TIIS (Japan)
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Entities which have evaluated ThermoProbe products to intrinsically
safe standards are:
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Underwriter Laboratories, Northbrook
IL USA
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Canadian Standards Association, Rexdale,
Ontario, CANADA
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KEMA, Arnhem, NETHERLANDS
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NEMKO, Oslo, NORWAY
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Yokagawa Research Institute, Tokyo,
Japan
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We are periodically inspected by representatives of these organizations
to ensure that ThermoProbe gauging thermometers are built to
written criteria as established through their respective evaluations.
Model TP-7 & 8 are listed for Class I, Division 1 Groups
A,B,C, and D.The highest Intrinsically Safe Classification in
North America. These models are also can be obtained with the
European classification EEx ia IIB.
Model TP-5 can carry the European classification EEx ia IIB
T3 as well as Class I, Division 1 Groups C and D for North America.
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STATIC DISSIPATION
ThermoProbe Inc. uses probe cable with a non-stick coated outer
jacket that is extremely resistant to melting and chemical damage.
Despite the good properties of the non-stick coated surface
it can accumulate static electricity like other plastics. To
minimize the accumulation of static on the cable, we have the
non-stick coated jacket impregnated with a high percentage of
electrically conductive additive. Although this is not required
by any of the safety agencies, we feel this extra precaution
is worth the added expense.
As with our cable, we also use static dissipating plastic for
our TP-7 case.
The models TP-5 and TP-8 are constructed with an aluminum case
so static accumulation is not an issue with material.
All models are equipped with a bonding (grounding) cord and
clip to ensure that any electric potential is neutralized. The
bonding clip should always be attached to a bare metal point
(with continuity to the vessel) before using the instrument.
This procedure should be followed before anything enters into
a vessel of flammable material.
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CE MARKING FOR EUROPE
We have had our TP-7 and TP-8 successfully evaluated to the
electromagnetic requirements of the EMC Directive 89/336/EEC.
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RECOMMENDED STANDARDS FOR PETROLEUM
GAUGING
American Petroleum Institute http://www.api.org
Tel: +1 202.682.8375
Chapter 3, Tank Gauging
Std 2545, Method of Gauging Petroleum and Petroleum Products,
October 1965
Chapter 3.1A, Manual Gauging of Petroleum and Petroleum Products,
First Edition, December
Chapter 3.1B, Standard Practice for Level Measurement of Liquid
Hydrocarbons in Stationary Tanks by Automatic Tank Gauging,
First Edition, April 1992; Reaffirmed, January 1997
Chapter 3.2, Tank Gauging--Gauging Petroleum and Petroleum Products
in Tank Cars, First
Chapter 3.3, Level Measurement of Liquid Hydrocarbons in Stationary
Pressurized Storage Tanks by Automatic Tank Gauging, First Edition,
June 1996
Chapter 3.4, Standard Practice for Level Measurement of Liquid
Hydrocarbons on Marine Vessels by Automatic Tank Gauging, First
Edition, April 1995
Chapter 3.5, Standard Practice for Level Measurement of Light
Hydrocarbon Liquids Onboard Marine Vessels by Automatic Tank
Gauging, First Edition, March 1997
Chapter 7, Temperature Determination
Chapter 7.1, Static Temperature Determination Using Mercury-in-Glass
Tank Thermometers,
Chapter 7.2, Dynamic Temperature Determination, Second Edition,
March 1995
Chapter 7.3, Static Temperature Determination Using Portable
Electronic Thermometers,
Chapter 7.4, Static Temperature Determination Using Fixed Automatic
Tank Thermometers
Chapter 17, Marine Measurement
Chapter 17.2, Measurement of Cargoes On Board Tank Vessels,
First Edition, July 1990;
Chapter 17.2A, Closed and Restricted Measurement, First Edition,
November 1995
ISO Switzerland http://www.iso.ch
ISO/DIS 4268
Petroleum and liquid petroleum products -- Temperature measurements
-- Manual methods
Publisher Unknown, location
in U.K.
International Safety Guide for Oil Tankers and Terminals
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