Product picture of resistance thermometer TST90

iTHERM ModuLine TST90
Industrial modular thermometer

Paired set of metric RTD thermometers for thermal energy measurements

TST90

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Specs at a glance

Accuracy

+/- 0.05 K (refering to delta-T)
Response time

depending on configuration
t50 = 10 s
t90 = 31 s
Max. process pressure (static)

at 20 °C: 50 bar (725 psi)
Operating temperature range

PT 100:
-50 °C …400 °C
(-58 °F …752 °F)
Max. immersion length on request

up to 4.000,00 mm (157,48'')

See all specifications

Field of application

The thermometer is mainly used in the chemical industry but also finds its use in other branches. The device is used for high-precision measurement of temperature
differences with matched sensor pairs. A variety of dimensions offers flexible application possibilities.

Universally usable for thermal energy measurements
Measuring range: -50 to +400 °C (-58 to +752 °F)
Paired in the range: 0 to +120 °C (+32 to +248 °F), Deviation of the sensors: ± 0.05 K
Paired in the range: –40 to 0 °C (-40 to 32 °F), Deviation of the sensors: ± 0.1 K
Protection class: up to IP68

Benefits

Fast replaceability of the insert
High degree of insert compatibility and design as per DIN 43772
Fast response time with reduced tip

Extended selection

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

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Success stories

High-quality instrumentation for cooling water systems

Torishima designs and builds large cooling water systems for customers in the Middle East, relying on Endress+Hauser instrumentation for the quality and performance of the products.
Read the full story
Temperature measurement in hydrogen production

Temperature measurement in hydrogen production with the iTHERM SurfaceLine TM611 - Non-invasive temperature measurement redefined
Read the full story
Increased energy efficiency in data center cooling systems

Ensure data center uptime and reduce energy costs by using precise temperature devices with robust 3- or 4-wire RTDs and smart temperature transmitters in liquid cooling applications.
Read the full story
Fast-responding temperature measurement in polymerization

To meet the challenges of temperature monitoring in such critical processes, a thermowell design has been developed that responds to process changes up to five times faster than standard designs.
Read the full story
Enhanced safety in polymer production

The Ziegler-Natta process uses hazardous chemicals like titanium tetrachloride. Precise temperature measurement is crucial to prevent runaway reactions and ensure safety and efficiency.
Read the full story

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	EN
04/08/2025
30/11/2024
31/08/2018

Language:	English
Version:	04/08/2025
File size:	809.1 KB
File name:	BA01915TEN_0325-00.pdf

Language:	English
Version:	01/04/2001
File size:	95 KB
File name:	TI093ten_0401.pdf

Language:	English
Version:	01/03/2013
File size:	446.8 KB
File name:	TI01109TEN_0213.pdf

	EN
04/08/2025
30/11/2024
31/08/2018

Language:	German
Version:	25/11/2025
File size:	307.6 KB
File name:	CS_01710S_20_DE_Gemeinde_Ettingen.pdf

Language:	Russian
Version:	26/08/2024
File size:	3.3 MB
File name:	2813 iTHERM 26.08.2024 to 26.08.2029.pdf

Language:	Romanian
Version:	22/06/2006
File size:	227.2 KB
File name:	RO_BRML_200_97.pdf

	EN
01/04/2001

	EN
01/03/2013
24/01/2013

	EN
20/02/2024

iTHERM ModuLine TST90Industrial modular thermometer

Paired set of metric RTD thermometers for thermal energy measurements

Specs at a glance

Accuracy

Response time

Max. process pressure (static)

Operating temperature range

Max. immersion length on request

Field of application

Benefits

Extended selection

Success stories

High-quality instrumentation for cooling water systems

Temperature measurement in hydrogen production

Increased energy efficiency in data center cooling systems

Fast-responding temperature measurement in polymerization

Enhanced safety in polymer production

Measuring principle

Characteristic / Application

Thermowell / protection tube

Insert / probe

Outer diameter protection tube / Insert

Max. immersion length on request

Material protection tube/ thermowell

Optional coating

Process connection

Tip shape

Surface roughness Ra

Operating temperature range

Max. process pressure (static)

Accuracy

Response time

Integration head transmitter

Back

BA iTHERM ModuLine thermometer

Omnigrad TST90 Old version (04.2001)

Omnigrad TST90, TET90 New version

BA iTHERM ModuLine thermometer

Device viewer

Energieeffizienzoptimierung

Product family: Process RTD direct contact, Process RTD general purpose, Process RTD heavy duty, Process RTD hygienic

Product family: Accessories: RTD insert, Accessories: TC insert, Accessories: Inserts, Process RTD direct contact, Process RTD gener al purpose, Process RTD heavy duty

Product family: Low cost RTD general purpose, Process RTD direct contact, PROCESS RTD EXPLOSION PROOF, Process RTD general purpose, PROCESS RTD HEAVY DUTY, RTD THERMOMETER ZONE "0"

Omnigrad M, TST 90

Back

Terminal Head TA30A

Terminal Head TA30D

Terminal Head TA20B

RTD Insert TET90 (1 pair)

Thermowell TW10

iTHERM ModuLine TT131

Spare parts kit ring D21/di 10xgreen

Thermoconductive Paste HSC 340, 100g

Thermo-conductive paste FDA-conform 30g

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Power Supply

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Power Supply

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Power Supply

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Calculations

Input

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Display

Power Supply

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Display

Power Supply

Input

Output

iTHERM ModuLine TST90
Industrial modular thermometer