Technical Data
CompareThermowell
| Measuring Principle | Bar stock Thermowell |
| Characteristic / Application | metric style compliant according to ASME, DIN or NAMUR standard universal use |
| Head connection | internal thread: M14x1,5 M18x1,5 M20x1,5 M27x2 1/2" NPT 1/2" NPSM 1/2"NPSC G1/2" G3/4" M24x1,5 sliding |
| Maximum standard immersion length | 1500 mm |
| Process connection | To be threaded weld in with flange according to ASME, EN or ISO |
| Thermowell root diameter | 9…50 mm |
| Medium contact material | Wide selection of materials including: 316 316L 316Ti 347 310 Alloy600 AlloyC276 10CrMo9-10 13CrMo4-5 16Mo3 A105 C22.8 Duplex Titan Gr.2 316+316L dual rated P355NH |
| Wetted part finishing (Ra) | < 0.8 μm (31.50 μin) < 1.6 μm (63.00 μin) DIN Standard |
| Tip shape | Straight Tappered Stepped partly tappered |
| Temperature range | -200…1100 °C (-328...2.012 °F) Depending on Configuration |
| Max. process pressure (static) | 500 bar (7252 psi) Depending on Configuration |
| Max. process pressure at 400 °C | depends on process connection and material |
The TT151 thermowell is designed in accordance with DIN 43772, ASME B40.9 and NAMUR NE 170 standards and also supports custom design on request. The robust thermowell is installed in process pipes or tanks and effectively protects the built-in temperature sensor against harsh process conditions, enabling safe, high-precision temperature measurement. The thermowell is made from solid drilled bar stock, with a tip diameter between 9...50 mm. Tip types include straight, reduced and stepped. The following process connections are supported: standard flange, thread, socket weld.
Advantages
TT151 standard industrial thermowell made from solid drilled bar stock
Modular design complying with DIN 43772, ASME B40.9 and NAMUR NE 170 standards, versatile and flexibly customizable
Flexible selection of the extension length, insertion depth and total length according to the actual operating conditions
Various sizes, materials and process connections available for flexible selection
Field of application
Protects the temperature sensor against physical and chemical deformation
Reliable operation under demanding conditions
Maximum pressure rating: 500 bar (7252 psi)
Installed in pipes, vessels or tanks
More convenient maintenance and recalibration of the measuring point (sensor replacement without interrupting the production process)
Configurator / Comparison
Accessories/Spare parts
Measuring principle video
Click to playManuals & Documents 4
All documents for this modelCase Studies
Municipal Wastewater Treatment · temperature casing — Application Case
Application Context
the inlet, biological and outlet stages of a municipal plant is a typical Municipal Wastewater Treatment duty. The project started from temperature casing, focusing on providing pressure-tight isolation and protection for temperature elements.
Process Constraints
effluent parameters drift and probes foul with sludge and biofilm, and high solids and corrosive fractions, with large diurnal flow swings only amplify it. The temperature casing specification must therefore cover sizing strength and vibration frequency against flow velocity, pressure and corrosivity.
Delivery Approach
Delivery was handled as the temperature range — temperature solution matched to measuring point and response needs. Execution centred on sizing strength and vibration frequency against flow velocity, pressure and corrosivity, together with stable compliance with Grade 1A discharge limits and online data reporting.
Field Results
Operation shows the benefit clearly — longer well life, avoiding breakage that disrupts the process, with confidence in this measuring point improving markedly.
Food & Beverage · temperature casing — Application Case
Customer Profile
The typical setting in Food & Beverage is dosing, pasteurising, filling and CIP stages. The measuring point is temperature casing; the focus is providing pressure-tight isolation and protection for temperature elements.
Key Difficulties
Conditions are syrups, dairy and beverages that scale easily, under strict hygienic requirements and, on top of that, frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, which a standard configuration cannot handle for long. The design therefore starts with sizing strength and vibration frequency against flow velocity, pressure and corrosivity.
Implementation
The scope ran through the temperature range: temperature solution matched to measuring point and response needs. Technically it hinges on sizing strength and vibration frequency against flow velocity, pressure and corrosivity, and on these requirements: food-safety and hygienic design per 3-A / EHEDG.
Customer Benefit
In practice this means longer well life, avoiding breakage that disrupts the process, which cut the workload on the site maintenance team.
Chemical & Pharmaceutical · temperature casing — Application Case
Project Background
The project covers reactors, metering vessels and finished-product tanks. The work centres on temperature casing and the core task is providing pressure-tight isolation and protection for temperature elements.
Operating Challenges
The medium and duty are characterised by highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. So temperature casing cannot be specified generically — it calls for sizing strength and vibration frequency against flow velocity, pressure and corrosivity.
Solution
The Ainstru engineering team worked through the temperature range: temperature solution matched to measuring point and response needs. The configuration involves sizing strength and vibration frequency against flow velocity, pressure and corrosivity, with these requirements in view: Ex certification and GMP traceability of records.
Results
Since start-up the system has run steadily; the practical result is longer well life, avoiding breakage that disrupts the process.
Power & Energy · temperature casing — Application Case
Project Overview
The site is boiler feedwater, turbine condensate and FGD/DeNOx systems. The customer wanted temperature casing properly configured on the existing plant, with the aim of providing pressure-tight isolation and protection for temperature elements.
Technical Challenges
What actually causes trouble is high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. All of this means the temperature casing configuration has to involve sizing strength and vibration frequency against flow velocity, pressure and corrosivity.
Configuration
Supply and installation were organised through the temperature range: temperature solution matched to measuring point and response needs. On site this meant sizing strength and vibration frequency against flow velocity, pressure and corrosivity, checked line by line against: compliance with power-industry codes and unit availability targets.
Performance
After commissioning the outcome is longer well life, avoiding breakage that disrupts the process, and the readings are now used for process tuning.
Related Products
Endress+HauseriTHERM ModuLine TT411
Endress+HauseriTHERM ModuLine TT131
Endress+HauserThermowell TWF11
Endress+HauserEx thermocouple thermometer
Endress+HauserThermowell TA575
Endress+HauseriTHERM ModuLine TT412
Endress+HauserThermowell TA576
Endress+Hauser