| FREQUENTLY
ASKED QUESTIONS |
ANSWER |
| Is a
bimetal thermometer tip sensitive? |
Yes.
For the most accurate temperature reading the stem must be immersed into the
medium at least 2-3". Unique to all Tel-Tru bimetal thermometers is a
groove on the stem that equals the minimum immersion depth so you won't have to
measure. |
|
| How
do I recalibrate a bimetal thermometer? |
To
recalibrate Tel-Tru Bimetal Thermometers see our
Pocket/Laboratory/Testing/Spot Checking or
Industrial Bimetal Thermometers product manuals. |
|
| How can
I tell if my thermometer is reading accurately? |
The
Tel-Tru Check-Temp Calibrator allow you to verify the accuracy of dial
thermometers and digital probes of all sizes. Our multi hole units fit probes
up to .250", .125", .187" and .375" diameter. The Tel-Tru
Check-Temp Calibrator allows accurate verification of thermometer accuracy at
the temperature point critical to the users actual application. For more
information visit Tel-Tru
Check-Temp Calibrators. |
|
| Do you
manufacture thermometers for barbecue cookers and smokers? |
Yes.
Visit Barbecue
Thermometers. |
|
| What is
Oxygen cleaning? |
The
service is technically “cleaned for oxygen service”. The purpose is to have an
instrument free of oil, grease or other impurities. The instrument that is used
to measure oxygen must be cleaned to avoid possible explosions. Oxygen and oil
do not mix well. Liquid filled gauges are not recommended for this application.
The cleaning process involves cleaning the socket and the internal part of the
bourdon tube with a chemical solution. |
|
| What is
the accuracy of Tel-Tru bimetal thermometers? |
+/- 1%
full span per ASME B40.3 Grade A. |
|
| How do
you sell your products? |
We sell
our products primarily through distributors and catalog houses that serve
industrial, HVAC, food service and other specialized industries. End-users who
can not find a Tel-Tru distributor within their area can buy Tel-Tru products
online, visit our Shop page.
Some products are sold direct to original equipment manufacturers (OEM's).
Please contact Tel-Tru to select the most appropriate channel of distribution
to meet your needs or visit our
Distributors page. Call us at 800-232-5335/585-232-1440. |
|
| Are
Tel-Tru bimetal thermometers hermetically sealed? |
Yes,
Tel-Tru bimetal thermometers are hermetically sealed per ASME B40.3 test. |
|
| How
do I select the correct thermowell for my application? |
See
How to Select Thermowells by viewing our
Thermowell brochure. |
|
| What is
the shortest stem length available on Tel-Tru bimetal thermometers? |
Stem
length depends on the model, temperature range and the application. Please
contact us at 800-232-5335/585-232-1440 or
contact us via the web. |
|
| Can I
shorten the stem length of a bimetal thermometer by cutting it? |
No, you
will destroy the thermometer. The bimetal coil assembly in the lower 2" of the
stem is the operating mechanism. |
|
| Can
Tel-Tru crossover other companies' product part numbers. |
Yes, on
most items. Contact the factory for more information. Please contact us at
800-232-5335/585-232-1440 or
contact us via the web. |
|
| How do
you measure stem lengths? |
Stem
lengths for thermometers with threaded connections are measured from the top of
the thread to the tip of the stem. Non threaded thermometers are measured from
the back of the case to the tip of the stem. See our
Bimetal Thermometer catalog. |
|
| What is
the procedure for the return or repair of damaged goods? |
The
original buyer must contact Tel-Tru to receive return materials authorization
(RMA) number. The item must be returned pre-paid in its original box with the
RMA number written on the box. It will be evaluated upon receipt. If an item is
repairable and under warranty, Tel-Tru will repair and return it no charge. If
the item is not repairable and is still under warranty, Tel-Tru will replace it
at no charge. If the thermometer shows signs of abuse, it should not be
returned to the factory. |
|
| Can
you make special dials? |
Custom
dial configurations are available. Contact our factory with your requirements.
Please contact us at 800-232-5335/585-232-1440 or
contact us via the web. |
|
| What
temperature ranges are available on Tel-Tru bimetal thermometers? |
See our
Bimetal Thermometer
catalog. |
|
| What
material is used to make Tel-Tru thermometers? |
304SS
is the standard material for the case, bezel and wetted parts. 316 stainless
steel parts are available on some models as an option. |
|
| Why do
some Tel-Tru thermometers have a pointed stem? |
The
pointed stem is the result of a high quality manufacturing process for sealing
the stem tip. |
|
| What is
the maximum stem pressure a bimetal thermometer can withstand? |
Bimetal
thermometers are not certified for pressure applications. It is standard
industry recommendation that anytime pressure is an issue a thermowell should
be used for safety reasons. |
|
| What is
the anti-parallax dial? |
The
dial is not flat. There is an outer ring that is raised to the same height as
the pointer which allows the pointer position to be read more accurately from
various angles. |
|
| Can a
Surface Thermometer be calibrated in the field? |
No. The
surface thermometer is calibrated when it is originally manufactured to an
accuracy of +/- 2%. |
|
| What
are the operating temperature limits for Tel-Tru bimetal thermometers with
silicone fill? |
The
maximum operating temperature is 500F(260C). The minimum operating temperature
is -50F (-45C). |
|
| Are
calibration certificates and certificate of origin and compliance available? |
Yes,
contact factory for charges (if required) 800-232-5335/585-232-1440.. These
certificates must be requested on your purchase order with the thermometers or
pressure gauges. |
|
| How
quickly can you manufacture bimetal thermometers? |
1
to 2 day turnaround is available. Standard lead time is 5 to 7 business days.
Please contact us at 800-232-5335/585-232-1440 or
contact us via the web. |
|
| Do
Tel-Tru bimetal thermometers carry the "N Stamp" so that they can be used on
the "hot" system (nuclear side) of a nuclear power plant? |
Tel-Tru
products do not carry the "N Stamp", but our products are used in the
non-nuclear system or side of nuclear power plants. To our knowledge, there are
no manufacturers of bimetal thermometers who have "N Stamp" approval. |
|
| Does
Tel-Tru have a lens material for thermometers which is UV stabilized? |
Both
the polycarbonate plastic and the acrylic plastic materials are UV stabalized
materials, which means the yellowing is delayed but will still happen over a
long period of time. |
|
| Can you
offer a silicone filled bimetal thermometer with shatterproof glass? |
Yes,
polycarbonate plastic is standard on silicone thermometers. Shatterproof glass
is available upon request. |
|
| Can
bimetal thermometers be filled with glycerine instead of silicone? |
No.
Glycerine is not an option for filling bimetal thermometers because it is too
viscous and it will not tolerate high temperatures. |
|
| What is
the active length of a bulb on Tel-Tru Gas Actuated thermometers? |
The
standard active length of a bulb is 3" x 3/8" diameter for all temperature
ranges and capillary lengths up to 120 feet. (36m). A 6" x 1/4" is available on
request for certain temperature ranges. |
|
| Can you
manufacture bimetal thermometers with non-standard stem lengths? |
Yes.
Tel-Tru can manufacture custom stem lengths up to 120" for bimetal
thermometers. |
