Ashcroft EL - Industrial Bimetal Thermometer - Manual

CAUTION:
Bimetal Thermometers operating below freezing must
have a perfectly tight case to prevent entrance of moisture
which eventually will condense and freeze inside the stem.
This condition shows up as a failure of the thermometer to
read accurately below 32°F or 0°C. For this reason it is
important to avoid damage to the glass front while the
stem temperature is at freezing or below. All thermometers
are hermetically sealed in a dry atmosphere at the factory
and require no further maintenance.
CAUTION:
Thermowells should be used on all pressurized appli-
cations, to protect the thermometer from corrosion or
physical damage, and to facilitate removal of the ther-
mometer without disturbing the process.
TESTING
Ashcroft Bimetal Dial Thermometers are carefully cali-
brated at the factory and under most operating condi-
tions will retain their accuracy indefinitely. However, as
in the case of all instruments, it is well to make periodic
checks for accuracy against known standards.
ADJUSTMENT
If it is necessary to make an adjustment to the ther-
mometer proceed as follows:
On thermometers fitted with an “External Adjustment”
– Use a small wrench, small screwdriver or a coin to
turn the slotted hexagon head in the back of the case
until the pointer indicates the proper temperature on
the dial.
MAINTENANCE OF
DIAL THERMOMETERS
Aside from occasional testing, little or no maintenance
is required.
Be sure that the gasketed glass cover is on the case at
all times, as moisture and dirt inside the case will even-
tually cause the thermometer to lose its accuracy. (See
caution note below.)
If the thermometer is used for measuring the tempera-
ture of a material that may harden and build up an
insulating layer on the stem, the thermometer should
be removed from the apparatus occasionally, and the
stem cleaned. Observe this precaution to ensure the
sensitivity of the instrument.
GENERAL
In removing the thermometer out of the packing box,
handle it by the case or case outlet. Avoid handling it by
the stem.
INSTALLATION OF THERMOMETERS
The thermometer should be mounted at any convenient
location where it will be subjected to the average tem-
perature variations to be indicated.
For an EVERYANGLE CONNECTION PLEASE REFER
TO THE REVERSE SIDE OF THIS DOCUMENT
before beginning the installation.
Avoid bending the stem as this will cause misalignment
of the internal parts, resulting in undue frictional errors.
To tighten the thermometer to the apparatus, use a
wrench applied to the hexagon head of the threaded
connection located just outside of the case.
INSTALLATION
Locate the stem so that at least two inches will be sub-
jected to the average temperature to be measured.
Exposing the stem to a temperature in excess of the
highest dial reading should be avoided.
The thermometer is normally provided with a threaded
connection. To tighten the thermometer to the appara-
tus or into the well, use an open-end wrench applied to
the hexagon head of the threaded connection.Turn until
reasonably tight, then tighten still further in the same
manner as a pipe elbow or similar pipe fitting until the
scale is in the desired position for reading. DO NOT
TIGHTEN BY TURNING THE THERMOMETER CASE.
Install the dry type thermometer so that the maximum
case temperature is kept below 200°F at all times.
Install the liquid filled type thermometer so that the
maximum case temperature is kept below 150°F at all
times.
When a thermometer is equipped with a well, the well
should be installed onto the apparatus first. The stem of
the thermometer should then be coated with a heat
conducting medium (a mixture of glycerin and graphite
or vaseline or any other heavy lubricant may be used),
after which the thermometer stem is inserted, and tight-
ened into the well.
INSTALLATION AND MAINTENANCE
INSTRUCTIONS FOR ALL ASHCROFT ®
BIMETAL DIAL THERMOMETERS
© 2011 Ashcroft Inc., 250 East. Main Street, Stratford, CT 06614-5145, USA Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale. I&M008-10187 Rev 01/14
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