Wise Controls Thermowell A50 Series User manual

C-QIM-2731-T05_EN_Rev.1
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Thermowell
A50X, A51X, A60X, A61X, A62X, A63X, A64X, A65X series

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Contents
1. General items......................................................................................................................2
1.1 Introduction......................................................................................................................... 2
1.2 Application..........................................................................................................................2
1.3 Warranty.............................................................................................................................2
2. Warning............................................................................................................................... 3
3. Main specs..........................................................................................................................4
3.1 Types of thermowell ...........................................................................................................4
3.1.1 Types of process connection........................................................................................... 4
3.1.2 Classification by material.................................................................................................4
3.1.3 Classification by thermowell shape.................................................................................4
3.2 Thermowell material........................................................................................................... 5
3.3 The insertion length of a thermowell .................................................................................. 7
3.4 External drawing of thermowell..........................................................................................8
4. Installation guide ............................................................................................................... 14
4.1 Pre-installation checks and precautions...........................................................................14
4.2 Installation requirement....................................................................................................14
4.3 Location for installation of temperature sensors and thermowells................................... 15
4.3.1 Installation ..................................................................................................................... 15
4.3.2 Installation conditions....................................................................................................16
5. Repair and maintenance...................................................................................................19
6. Defect................................................................................................................................ 19
7. User’s duties...................................................................................................................... 19
8. Product return.................................................................................................................... 20

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1. General items
1.1 Introduction
WISE Control Inc. temperature sensors and thermowells are precisely fabricated according to
customer specifications. The products must be tested and stored in appropriate locations, and the
requirements provided in the documentation, test reports and handling manuals, etc., must be
adhered to in order to maintain optimum state during the duration of use.
1.2 Application
The thermowell is designed to protect a thermometer or temperature sensor from fluid flow velocity,
pressure and corrosion, etc., inside pipes. The design prevents leakage of fluid from inside the pipe
when a malfunctioning sensor is being replaced. The user is responsible for selecting the appropriate
thermowell for the process at hand. WISE Control Inc. may provide advice when selecting products,
but will not be held liable for mis-selection of product.
1.3 Warranty
If one causes damage to the product due to failures to comply with the user manual, or if one
arbitrarily remodels it, changes or repairs the product, the manufacturer will not be responsible for it,
and the product warranty period will expire.

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2. Warning
Guide on handling for safe use
For the safe and correct use of the product, make sure to read the handling guide carefully before use.
Handling errors can cause device malfunctions, and it can lead to injury, accidents, etc..
Warning !
1) For the safety, only a worker with professional skills in electronics and electrical construction
is allowed to install the product.
2) Install the product in the environment of use indicated in the specifications.
3) Use the product in the permissible temperature range.
4) Do not apply excessive loads, vibrations, or impacts.
5) When selecting a thermowell for the product, select a thermowell appropriate to the usage
conditions and environment.
6) The customer is responsible for mis-selection of thermowells.

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3. Main specs
3.1 Types of thermowell
3.1.1 Types of process connection
1) Thread type: Most widely used and least costly method. Screw type attachments allow for easy
installation and removal from pipes or tanks. Welding or soldering may be used to provide
additional strength.
2) Flange type: This type comes with a flange on the upper edge, and the flange is secured to the
pipe using nuts and bolts. Flange type thermowells are commonly used in environments
requiring frequent replacement, such as high-temperature applications.
3) Welded type: The welded type is preferred for the food and pharmaceuticals industry where
keeping foreign matter or contaminants out of thermowells is critical. Welded type thermowells
are welded directly onto pipes and can be used indefinitely. Socket weld type thermowells are
used for applications involving extremely high temperatures and pressures.
3.1.2 Classification by material
1) Protection tube type
2) Drilled bar type
3.1.3 Classification by thermowell shape
1) Straight type: Straight type thermowells have uniform diameter throughout the entire insertion
length. Straight type thermowells are simple to manufacture and have outstanding strength, and
provide protection against erosion and corrosion.
2) Taper type: Diameter gradually decreases along the insertion length. Taper type thermowells are
suitable for high-speed, medium-load processes, and provide fast response times.
3) Stepped type: Diameter varies in stepwise fashion along the insertion length. Reduced thermal
inertia at the end of the process means faster response to temperature changes using a stepped
type thermowell.
※Strength cannot be calculated for a protection tube type thermowell. Protection tube type
thermowells are typically used for applications without pressure or flow rate.

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3.2 Thermowell material
Thermowells can be made of various materials depending on the composition, temperature and flow
rate of the fluid medium. Typically, increased temperature and concentration of the fluid medium
causes the corrosive effect to increase. Simultaneously, particles suspended in the fluid medium
cause erosion. All of these parameters must be given consideration when selecting a thermowell
material. See the table below for details on thermowell materials.
Non-metal
Material
Symbol
Usage
temperature
(℃)
Max.
temperature
(℃)
Characteristic
SSA-S
(Recrystallized
alumina)
PT-0
1700
1800
Temperatures up to 1900(℃) can be
measured. For use in measuring
slag, molten steel and molten glass
temperatures. High resistance to
thermal shock
HB
(Mulite)
PT-1
1500
1600
Can measure up to 1550(℃). Used
for measuring temperatures in high-
temperature areas of heating
furnaces and thermal energy storage
chambers.
Recrystallized
siliconcarbide
GK-Sic
1650
-
Can measure up to 2200(℃) in
neutral atmospheres. Used for
measuring molten zinc, aluminum
and copper, etc. Deposition of acids
and alkalis difficult.
Self-bonded
silicon carbide
Y2-Sic
1650
2300
High resistance against heat shock
in airtight environments, with
outstanding wear and corrosion
resistance at high temperature. Can
measure up to 1700(℃) in oxidizing
and reducing atmospheres
Clay-bonded
silicon carbide
Y3-Sic
1500
1700
High thermal conductivity for more
accurate temperature measurement
compared to oxide-based. High
thermal shock resistance to rapid
heating and chilling

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Metal
Material
Usage
temperature
(℃)
Max.
temperature
(℃)
Characteristic
304SS
900
1000
Typically used in thermowells to protect against heat and
corrosion. Direct use in sulfurous environments or
reducing flame is not recommended.
316SS
900
1000
Contains Mo for outstanding heat, acid and alkaline
resistance.
316L SS
950
1050
Less carbon content than 316.
Better acid and alkaline resistance than 316SS.
321SS
900
1000
Weak sulfur and reducing heat resistance. Outstanding
corrosion and heat resistance
310SS
950
1050
High Ni and Cr content, with optimal high-temperature
strength with high heat and oxidation resistance.
347SS
900
1000
Contains Nb-Ta for better corrosion resistance than
304SS. Outstanding resistance to fine surface corrosion.
446SS
1050
1125
High Cr steel with outstanding resistance to oxidizing
and reducing atmospheres containing sulfur. Suitable for
salt baths, castings and other high-temperature
environments.
Inconel600
1180
1250
High Cr and Ni steel with outstanding resistance to
oxidizing and reducing atmospheres at high temperature.
Cannot be used in sulfurous atmospheres.

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3.3 The insertion length of a thermowell
The insertion length of a thermowell is the distance from beneath the process connection to the tip of
the thermowell. (Dimension ‘U’ in 3.4 External drawing of thermowell) While there are no standards
designating the insertion length of a thermowell, thermowell insertion depth is typically designated by
the process engineer. There are also a number of general rules that apply. To increase measurement
accuracy, all thermowells are inserted to a length of 1/3 or 1/2 of the pipe diameter. The American
Petroleum Institute (API) recommends a thermowell insertion length of the temperature sensor plus 2
inches (50mm). As for the optimum insertion length for measuring liquids using temperature sensors,
5 times the root diameter of the thermowell is recommended. The recommended insertion length for
gases is 10 times the root diameter of the thermowell.

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3.4 External drawing of thermowell

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*Note.
For helical type thermowells, please refer your design for strength calculation and check the results
before placing your order.

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4. Installation guide
4.1 Pre-installation checks and precautions
1) Be careful not to damage during storage or transport.
2) Check the product for damage prior to installation.Please inquire with the manufacturer is the
product is damaged.
3) Do not remove packaging until immediately before installing the product.
4.2 Installation requirement
1) Protect the thermowell from heat shock or mechanical impact.
2) Do not apply excessive force when inserting or installing the thermowell.
3) Do not bend or deform the thermowell when installing.
4) The end user must ensure that the instrumental has been appropriately installed so that the allowed
limits are not exceeded.

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4.3 Location for installation of temperature sensors and thermowells
4.3.1 Installation
1) Install pipe temperature sensors as shown in the figure below to prevent condensation.
2) Install in a location where a representative temperature of the process fluid can be measured.
3) The sensor should be installed to be completely submerged in the fluid being measured.
4) On lines where the pipes are subject to vibration, install as far away from vibration as
possible.
5) Minimize the impact of natural frequencies, and keep the insertion length as short as possible
6) If the process connection is of the screw type, fasten using a sealing agent.
7) When installing on lines with a flow rate, install the sensor in a direction opposite the flow
direction. If this is not possible, install in a diagonal direction. If both options are infeasible,
install perpendicularly to the direction of flow. (See installation conditions below)
※Caution
When installing on a line with a flow rate, use a drilled bar type thermowell even if the flow rate is low.
If needed, please refer your design for strength calculation and check the results before placing your
order.

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4.3.2 Installation conditions
1) Installation on curved pipe
Installation in direction opposite flow direction
Installation in direction opposite flow direction
Installation diagonal to flow direction
Installation perpendicular to flow direction
2) Installation on straight type section
Installation diagonal to flow direction
Installation perpendicular to flow direction

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3) Installation on T-junction
Installation diagonal to flow direction
Installation perpendicular to flow direction
4) Installation on tapering pipe
Installation diagonal to flow direction
Installation perpendicular to flow direction
5) Installation on pipe with other devices installed
Installation diagonal to flow direction
Installation perpendicular to flow direction

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6) Installation on header
*Note.
The insertion length and diameter of the thermowell varies depending on process conditions,
especially the flow rate of the fluid being measured.
Thermowell guidelines are provided in accordance with ASME PTC 19.3.
The system operator is responsible selecting the right thermowell and material to ensure safe
operation within the plant or machinery.
WISE Control Inc. can only provide recommended specifications based on experience in similar
applications.
The installation conditions given above are recommendations for accurate temperature
measurement, and are intended as a reference for installation.

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5. Repair and maintenance
Perform regular visual inspection for thermowell leaks or damage.Also confirm that thermowells are
properly sealed and secured.
6. Defect
If the defect cannot be removed through the measures listed above, immediately shut down the
equipment. Confirm that all pressure has been released and no signal is output, and protect the
equipment to prevent restarting. In this case, please contact the manufacturer.
If it is necessary to return the equipment, please follow the instructions in Chapter 11, “Returns”.
7. User’s duties
Temperature sensor products are used in high temperatures and corrosive environments. The right
product must be selected based on various safety considerations. For all temperature sensors
designs, proper installation is the most important.
Incorrect installation can eventually lead to an inaccurate reading of temperature.
Wise Co., Ltd. can support users’ selection but will not be responsible for them in any sort of way.
Defect
Cause
Response
Interference by
process screws at
installation
Selection of inappropriate material
Select appropriate material or use
appropriate lubricant
Cannot insert
temperature sensor
into thermowell
Foreign matter inside thermowell
Damaged thermowell or damage to
process connection of temperature
sensor
Mismatch between sensor
dimensions and inner diameter of
thermowell
Remove foreign material
Remachine thermowell or wash
connection screws
Check dimensions and re-fabricate
Return for repairs
Leak of process fluid
error or sealing defect during
thermowell installation
Inspect sealings