Wise Controls Thermowell A50 Series User manual

C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
Thermowell
A50X, A51X, A60X, A61X, A62X, A63X, A64X, A65X series

1
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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

2
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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.

3
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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.

4
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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.

5
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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

6
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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.

7
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
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.

8
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]
3.4 External drawing of thermowell

9
C-QIM-2731-T05_EN_Rev.1
Tel [phone]
Fax [phone]
[email protected]