Endress+Hauser M TST90 Specifications

Technical Information
TI093T/02/en
No. 71108018

RTD Thermometer

omnigrad TST90

Process thermometer - Building automation
Ø 6 mm M.I. replaceable inset
Straight and Reduced Tip - Matched pairs

Description

TST90 RTD thermometer assembly
includes a replaceable single Pt100 inset
in mineral insulated cable, a terminal
head and a thermowell.
The inset is equipped with special
matched Pt100 for thermal energy
measurement.
The terminal head can be selected from a
wide choice of standard items (see the
Order key or the TA20 Technical
Information for more details).
The thermowell can be delivered with a
reduced tip for fast response time.
TST90 is always delivered in matched
pairs.

Application

Typical application can be found in heat
exchangers for inlet and outlet differential
temperature measurement.
The thermal energy can be calculated
knowing ΔT between inlet and outlet,
flowrate and other parameters.

Technical data

omnigrad TST90

Mineral insulated
replaceable inset

Version: TET90
Sensing element: Platinum resistance, 1 Pt100 Ω at 0°C, thinfilm type
Tolerances: matched pairs, ±0.05 K (0÷120°C) or ±0.1 K (-40÷0°)
Wiring: 2 or 4 wire connections
Insulation resistance:

≥ 100 MΩ , test voltage 250 V at ambient temperature

Electrical connections: terminal block
Stem: mineral insulated cable (MgO)
Sheath: AISI 316L/W.1.4404
Standard diameter: 6 mm straight tip type or 3x50 reduced tip type
Operating temperature: -50 ... +200 °C

IL

Response time values: according to IEC751 in moving water at 0.4 m/s

= 24 s ; T90 =72 s (straight tip)

T

50

T50 = 7.5 s; T90 = 20.5 s (reduced tip)

Internal resistance: for 2 wire electrical connection compensation

0.06 Ω/m for each single conductor (straight tip)

0.12 Ω/m for each single conductor (reduced tip)

Replacement: inset length IL is calculated as follows

d 6

TET inset

sensing
length

=

25 m m

IL = L + 155 mm

Protecting tube Version: TA10 thermowell

Standard diameter: 9x7 mm
Reduced tip: see drawing next page
Standard material: AISI 316Ti/W.1.4404
Connection to head: M24 x 1.5
Process connection: G 1/2" - M
Max. operat. condition: 50 bar @ 20°C; 1 bar @ 400°C

Terminal head Version, protection class and electrical connection: refer to order key

2 Endress+Hauser