DURATEMP
®
GAS ACTUATED
THERMOMETERS, INSTALLATION
AND USE INFORMATION
INSTALLATION OF REMOTE
READING THERMOMETERS
The case of the thermometer should
be mounted at a location where it can
be read conveniently. The maximum
case temperature should not exceed
160°F (70°C). The capillary line also
should be laid so that it will not be
exposed to extreme temperatures,
such as alongside steam pipes, ov-
ens or other heated surfaces.
The minimum capillary line radius is
1˝. Place it so that it will be protect-
ed from damage. Should the capil-
lary line be too long, coil the surplus
neatly at a convenient point but
“DO NOT CUT IT.”
The thermometer system (Bourdon
spring, capillary line and tempera-
ture sensing bulb) must not, under
any circumstances be taken apart,
or the capillary line cut.
INSTALLATION OF TEMPERA
-
TURE SENSING BULB IN
THERMOWELL— (note: a
3
/
8
˝
bore thermowell is required—
adapters are available to permit
installation in larger bore
thermowells.)
1. Install thermowell.
2. Assemble union connection to
temperature sensing bulb finger
tight.
3. Apply heat conducting medium
to temperature sensing bulb of
thermometer (50/50 mix of glyc-
erin and graphite, or Vaseline.)
4. Insert temperature sensing
bulb into thermowell and hold
against bottom of thermowell.
5. Assemble union connection to
thermowell.
6. Tighten jam nut to union to lock
temperature sensing bulb in po-
sition, normal tightening is
3
/
4
to
1 turn from finger tight.
Where service temperatures exceed
350°F (177°C) the heat conducting
medium may smoke when first sub-
jected to a high temperature. This is
caused by the vehicle, in the heat
conducting medium, vaporizing and
leaving the dry solids behind. This
should not be cause for alarm. The
dry solids will act equally well as a
heat conducting medium for tem-
peratures up to 1200°F (650°C).
TESTING
Every ASHCROFT DURATEMP
thermometer is carefully calibrated
at the factory and under normal
operating conditions it will remain
accurate. If it is necessary to test
the thermometer the following pro-
cedure should be used:
Immerse the entire sensitive part
of the temperature sensing bulb
side by side with a test thermometer
of known accuracy in a liquid bath
which is being stirred vigorously
and in which the temperature is
maintained constant for several min-
utes before readings are taken.
Never attempt to test thermome-
ters in air. Air is a poor conductor of
heat and there is always the danger
of cold currents influencing the ther-
mometer reading.
TO CHANGE THE INDICATED
TEMPERATURE READING
1. Remove the window.
2. Hold the hub of the pointer sta-
tionary. Use a slotted screwdriver
for 4
1
/2˝ and 8
1
/2˝ cases, grasp
the knurl of the 6˝ pointer hub.
3. Hold pointer in other hand be-
tween thumb and forefinger so
that torque can be applied to
move pointer.
4. Establish reference temperature
and rotate pointer required
amount for most accurate
reading.
5. Replace the window.
INSTALLATION OF DIRECT
READING THERMOMETERS
POSITIONING THE SYSTEM
Before installation, the stem should
be set to the desired angle as fol-
lows:
1. Loosen the four screws labeled
“A” and “B” in Figure until the
harness revolves freely without
twisting the flexible housing.
2. While holding the case, revolve
the harness clockwise or coun
-
terclockwise as indicated by the
arrows in Figure to place the
harness in a position that will
permit flexing the stem in the
desired direction with respect
to the case, then lock the two
screws labeled “A.”
3. Flex the stem to the desired
angle with respect to the face
of the thermometer as shown
in Figure, then lock the screws
labeled “B.”
INSTALLATION
1. The thermometer is normally
provided with a threaded con
-
nection. To tighten the ther-
mometer to the apparatus or
into a thermowell, use an open
end wrench applied to the hexa-
gon head of the threaded con-
nection. Turn until reasonably
tight, then tighten still further in
the same manner as a pipe fit-
ting until the scale is in the de-
sired position for reading. “DO
NOT TIGHTEN BY TURNING
THE THERMOMETER CASE.”
2. Insert the thermometer into the
threaded connection and turn
the compression nut until rea-
sonably tight, then tighten still
further in the same manner as
a pipe fitting.
“A”
“B”
Harness
Compression
Nut
Threaded
Connection
ASHCROFT INC.
250 EAST MAIN ST.
STRATFORD, CT 06614-5145
TEL: 203-378-8281 • FAX: 203-385-0408
EMAIL: INFO@ASHCROFT.COM
www.ashcroft.com
I&M008-10067-2/01(250-2199R3) 4/06
© Ashcroft Inc. All sales subject to standard terms and
conditions of sale. Printed in U.S.A.
(2 pages)
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