Datasheet summary
TH51,TH52, TH56
Engineering summary from PDF text extraction for TH51,TH52, TH56. Verify every value with the OEM datasheet.
Summary
Product Identification
- Product Line: TH51, TH52, TH56 General purpose MgO insulated thermocouples
- Document: TI00111R/09/EN/17.25-00
Application
Magnesium Oxide (MgO) insulated thermocouples are suitable for various process and laboratory applications including:
- Heat exchangers
- Power and recovery areas
- Furnaces, dryers, flue gas
- Compressor stations
- Process reactors
- Metallurgical and glass manufacturing
Measuring Principle
Thermocouples utilize the Seebeck effect, generating a thermoelectric voltage based on the temperature difference between the measuring junction and the cold junction. Absolute temperature can be determined if the cold junction temperature is known or compensated. Standards such as IEC 60584 and ASTM E230/ANSI MC96.1 define material combinations and voltage/temperature characteristics.
Input
- Measured Variable: Temperature (temperature-linear transmission behavior)
Measurement Range
Upper temperature limits for various sheath diameters and thermocouple types:
| Sheath O.D. | Thermocouple Type | T | J | E | K | N |
|---|---|---|---|---|---|---|
| ⌀ ¹⁄₁₆ in (0.010) | Element wire ⌀ | 260 °C (500 °F) | 440 °C (825 °F) | 510 °C (950 °F) | 920 °C (1 690 °F) | |
| ⌀ ¹⁄₈ in (0.020) | Element wire ⌀ | 315 °C (600 °F) | 520 °C (970 °F) | 650 °C (1 200 °F) | 1 070 °C (1 960 °F) | |
| ⌀ ³⁄₁₆ in (0.029) | Element wire ⌀ | 370 °C (700 °F) | 620 °C (1 150 °F) | 730 °C (1 350 °F) | 1 150 °C (2 100 °F) | |
| ⌀ ¹⁄₄ in (0.039) | Element wire ⌀ | 720 °C (1 330 °F) | 820 °C (1 510 °F) | |||
| ⌀ ³⁄₈ in (0.060) | Element wire ⌀ |
Maximum element temperature range limits:
- T: –270 to +400 °C (–454 to +752 °F)
- J: –210 to +1 200 °C (–346 to +2 192 °F)
- E: –270 to +1 000 °C (–454 to +1 832 °F)
- K: –270 to +1 372 °C (–454 to +2 500 °F)
- N: –270 to +1 300 °C (–454 to +2 372 °F)
Note: These values are guides and may require reduction for extended life or performance. Duplex versions of type N with ⌀ ¹⁄₁₆", ³⁄₁₆", and ³⁄₈" sheath diameters are not available. Thermocouples with 316 SS sheath are rated for a maximum of 927 °C (1 700 °F).
Output
- Output Signal:
- Directly-wired sensors (without transmitter)
- Via Endress+Hauser iTEMP temperature transmitters using common protocols.
Family of Temperature Transmitters
iTEMP transmitters offer enhanced accuracy and reliability compared to direct-wired sensors, reducing wiring and maintenance costs. Available configurations include:
- 4 to 20 mA head transmitters: Universally applicable, easily configured at a PC.
- HART® head transmitters: 2-wire device with one or two measuring inputs and one analog output. Optional integrated Bluetooth® for wireless communication.
- PROFIBUS® PA head transmitters: Universally programmable with PROFIBUS® PA communication for digital output signals.
- FOUNDATION Fieldbus™ head transmitters: Universally programmable with FOUNDATION Fieldbus™ communication for digital output signals. Approved for major process control systems.
- Head transmitter with PROFINET® and Ethernet-APL™: 2-wire device with two measuring inputs, PROFINET® protocol. Power supplied via 2-wire Ethernet (IEEE 802.3cg 10Base-T1). Suitable for Zone 1 hazardous areas.
- Head transmitter with IO-Link®: IO-Link® device with one measurement input and IO-Link® interface for digital communication.
iTEMP Transmitter Advantages:
- Double or single sensor input (optionally)
- Attachable display (optionally)
- High reliability, accuracy, and long-term stability (≤ 0.05% per year)
- Mathematical functions
- Thermometer drift monitoring, sensor backup, and diagnostic functions
- Sensor-transmitter-matching based on Callendar van Dusen coefficients (CvD)
Field Transmitter
Field transmitters offer HART®, FOUNDATION Fieldbus™, or PROFIBUS® PA communication with a backlit display for easy reading. Benefits include dual sensor input, high reliability in harsh environments, and diagnostic functions.
Galvanic Isolation
Endress+Hauser iTEMP transmitters offer galvanic isolation:
| Transmitter Type | U (AC) |
|---|---|
| TMT162 HART® Field transmitter | 2 kV |
| TMT71 | |
| TMT72 HART® | |
| TMT82 HART® | |
| TMT84 PA | |
| TMT85 FF | |
| TMT142B |
High galvanic isolation is recommended for grounded thermocouples to avoid ground loops.
Power Supply
- Refer to terminal assignment diagrams for specific transmitter types (TMT8x, TMT7x, TMT162/TMT142B).
Integrated Overvoltage Protection
An optional module protects electronics from overvoltage on signal, communication, and power supply lines.
- Maximum continuous voltage (rated voltage): UC = 42 VDC
- Nominal current: I = 0.5 A at Tamb. = 80 °C (176 °F)
- Lightning surge current D1 (10/350 µs): Iimp = 1 kA (per wire)
- Nominal discharge current C1/C2 (8/20 µs): In = 5 kA (per wire), In = 10 kA (total)
- Temperature range: –40 to +80 °C (–40 to +176 °F)
- Series resistance per wire: 1.8 Ω, ±5 %
Grounding
Device must be connected to potential equalization with a minimum cross-section of 4 mm² (13 AWG).
Electrical
Fieldbus Connector
- Type: PROFIBUS®-PA or FOUNDATION Fieldbus™
- Dimensions: 190 mm (7.48 in) height, 26.5 mm (1.040 in) width
- Connection: M12 on PROFIBUS®-PA or 7/8-16 UNC on FOUNDATION Fieldbus™
- Ambient Temperature: –40 to 150 °C (–40 to 300 °F)
- Degree of Protection: IP 67
Performance Characteristics
Reference Conditions
Data for determining accuracy of temperature transmitters.
Response Time
63% response time per ASTM E839 (sensor assembly only):
| Junction Style | ⌀¹⁄₁₆" | ⌀¹⁄₈" | ⌀³⁄₁₆" | ⌀¹⁄₄" | ⌀³⁄₈" |
|---|---|---|---|---|---|
| Grounded | 0.3 s | 0.6 s | 0.9 s | 1.3 s | 3.5 s |
| Ungrounded | 0.4 s | 1.6 s | 2.4 s | 2.9 s | 7.2 s |
Maximum Measured Error
Thermocouples corresponding to ASTM E230:
| Type | Temperature Range [°C] | Standard Tolerance (IEC class 2) | Special Tolerance (IEC class 1) |
|---|---|---|---|
| E | 0 to 870 (32 to 1 600 °F) | ±1.7 or ±0.5% | ±1 or ±0.4% |
| J | 0 to 760 (32 to 1 400 °F) | ±2.2 or ±0.75% | ±1.1 or ±0.4% |
| K | 0 to 1 260 (32 to 2 300 °F) | ±2.2 or ±0.75% | ±1.1 or ±0.4% |
| T | 0 to 370 (32 to 700 °F) | ±1 or 0.75% | ±0.5 or ±0.4% |
| N | 0 to 1 260 (32 to 2 300 °F) | ±2.2 or ±0.75% | ±1.1 or ±0.4% |
For °F measurement errors, calculate in °C and multiply by 1.8.
Transmitter Long-Term Stability
- ≤ 0.1 °C (0.18 °F) / year or ≤ 0.05 % / year (larger value applies).
Insulation Resistance
- 1000 MΩ at 25 °C (77 °F) for MgO insulated thermocouples with ungrounded hot junction (between terminals and probe sheath, 500 VDC test voltage).
Calibration Specifications
- Manufacturer provides comparison calibrations from –20 to +300 °C (–4 to +573 °F) on the ITS-90.
- Calibrations are traceable to NIST standards and conform to ASTM E220.
- Three-point calibrations are available if specified temperatures are within the recommended range and minimum length requirements are met.
Installation Conditions
Orientation
- No restrictions.
Environment
Ambient Temperature Range
| Configuration | Temperature Range |
|---|---|
| Terminal head (without transmitter) | Depends on terminal head and cable gland/connector |
| Terminal head (with transmitter) | –40 to 85 °C (–40 to 185 °F) |
| SIL mode (HART 7 transmitter) | –40 to 70 °C (–40 to 158 °F) |
| With transmitter and display | –20 to 70 °C (–4 to 158 °F) |
| Field transmitter (without display) | –40 to 85 °C (–40 to 185 °F) |
| Field transmitter (with display/PROT) | –40 to +80 °C (–40 to +176 °F) |
| SIL mode (field transmitter) | –40 to +75 °C (–40 to +167 °F) |
Shock and Vibration Resistance
- 4 g / 2 to 150 Hz as per IEC 60068-2-6
Process
Process Pressure Limits
See the attached p/T load curve diagrams for pressure limits based on temperature, insertion length (L), and flow velocity (air or water/steam). The following table provides maximum allowable process pressure (PSIG) for instrumentation with one-time adjustable compression fittings:
| Temperature °C (°F) | Sheath ⌀ ¹⁄₁₆" | Sheath ⌀ ¹⁄₈" | Sheath ⌀ ³⁄₁₆" | Sheath ⌀ ¹⁄₄" | Sheath ⌀ ³⁄₈"¹⁾ |
|---|---|---|---|---|---|
| –28 to 204 (–20 to 300) | 3 300 | 2 850 | 3 150 | 3 350 | 3 900 |
| 204 (400) | 3 200 | 2 750 | 3 050 | 3 250 | 3 800 |
| 260 (500) | 3 000 | 2 550 | 2 850 | 3 000 | 3 500 |
| 316 (600) | 2 800 | 2 400 | 2 700 | 2 850 | 3 300 |
| 371 (700) | 2 700 | 2 350 | 2 600 | 2 750 | 3 200 |
| 427 (800) | 2 650 | 2 300 | 2 550 | 2 650 | 3 100 |
| 482 (900) | 2 600 | 2 200 | 2 450 | 2 600 | 3 050 |
| 538 (1 000) | 2 400 | 2 100 | 2 300 | 2 450 | 2 850 |
¹⁾ Not available with ¹⁄₈" NPT compression fittings. Re-adjustable compression fittings are for mechanical holding only.
Resonance Frequency: Examples of resonance frequencies for specific probe configurations (316SS, ¼" sheath, 0.028" wall thickness) are provided for air flow velocities, indicating potential damage. Stress analysis is recommended for variations in length, materials, sheath diameter, or wall thickness.
Mechanical Construction
Design, Dimensions
- TH51: Features a process connection (thread, none, or compression fitting).
- TH52: Includes extension leadwire transition with relief spring and options for leadwire termination or plug/female jack.
- TH56: Offers plug version and female jack options.
- Duplex version (2 elements) is not available for TH56.
Dimensions (in inches):
| Dimension | TH51 | TH52 | TH56 |
|---|---|---|---|
| Immersion length X | 4", 6", 9", 12" | 6", 12", 18", 24" | 12", 18", 24", 48", 72", 96" |
| Wire length B | 48", 72", 120" | ||
| Sheath diameter A | ⌀¹⁄₁₆", ⌀¹⁄₈", ⌀³⁄₁₆", ⌀¹⁄₄", ⌀³⁄₈" | specified length 2" to 96" | specified length 12" to 300" in 12" increments |
| Wall thickness S | 0.007", 0.014", 0.022", 0.029", 0.045" |
Hot or Measuring Junction
- Grounded Junction: Welded into the sheath, offers faster response but requires transmitters with galvanic isolation for reliable readings (except for Type T thermocouples).
- Ungrounded Junction: Welded junction is isolated from the sheath, reducing electrical interference. Recommended for extreme temperatures, rapid thermal cycling, and corrosion resistance. Offers excellent noise immunity. Dual ungrounded elements have individually isolated junctions, except for ⌀¹⁄₁₆" which has common junctions.
Weight
- 0.5 to 2.5 kg (1 to 5.5 lb)
Material
Process Connection, Terminal Head, and Sheath
Recommended maximum temperatures for continuous use in air:
| Material Name | Short Form | Recommended Max. Temp. (°C/°F) | Properties |
|---|---|---|---|
| AISI 316/1.4401 | X5CrNiMo17-12-2 | 650 °C (1 202 °F)¹⁾ | Austenitic, stainless steel. High corrosion resistance, especially in chlorine-based and acidic, non-oxidizing atmospheres. |
| AISI 316L/1.4404/1.4435 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 | 650 °C (1 202 °F)¹⁾ | Similar to 1.4401 with increased resistance to intergranular corrosion and pitting. 1.4435 offers higher corrosion resistance and lower delta ferrite content. |
| Alloy 600/2.4816 | NiCr15Fe | 1 100 °C (2 012 °F) | Nickel/chromium alloy with excellent resistance to aggressive, oxidizing, and reducing atmospheres at high temperatures. Resistant to chlorine gas, chlorinated media, and many mineral/organic acids. Not for sulfur-containing atmospheres. |
¹⁾ Can be used to 800 °C (1472 °F) with low compressive loads and non-corrosive media.
Process Connection
- Threaded:
- G ½" DIN / BSP: 0.6 in thread length, 1.06 in width across flats. Max. static pressure: 400 bar (5 802 psi) at +400 °C (+752 °F).
- NPT ½": 0.32 in thread length, 0.87 in width across flats.
- Compression Fitting: Available in stainless steel with FEP or SS ferrules, with various tube sizes and process thread options (¹⁄₈" NPT, ¹⁄₄" NPT, ½" NPT).
Housing
Terminal Heads
- General: Conforms to DIN EN 50446, flat face, with a ½" NPT thermometer connection.
- TA30H: Flameproof (XP), explosion-protected. Degree of protection: IP 66/68 (Ex: IP 66/67). Temperature: –50 to +150 °C (–58 to +302 °F). Material options: Aluminum or Stainless Steel 316L. Threads: NPT ½", NPT ¾", M20x1.5, G½". Weight: Aluminum approx. 860 g, Stainless Steel approx. 2 900 g.
- TA30R: Degree of protection: IP69K (standard), IP66/68 (display window). Temperature: –50 to +130 °C (–58 to +266 °F). Material: Stainless steel 316L. Threads: NPT ½", M20x1.5. Weight: 360 g (standard), 460 g (display window).
- TU401: Protection class: IP65 (NEMA Type 4x). Temperature: –40 to 130 °C (–40 to 266 °F). Material: Aluminum alloy. Threads: M20x1.5 or plug M12x1 PA. Connection: M24x1.5, G 1/2" or NPT 1/2". Weight: 300 g.
- TU401 (TA30D style): Protection class: IP66/68 (NEMA Type 4x). Temperature: –50 to +150 °C (–58 to +302 °F). Material: Aluminum. Threads: G ½", ½" NPT and M20x1.5. Connection: M24x1.5. Weight: 390 g.
- TU401 (TA30S style): Degree of protection: IP65 (NEMA Type 4x). Temperature: –40 to +85 °C (–40 to +185 °F). Material: Polypropylene (PP). Threads: ¾" NPT, M20x1.5. Connection: ½" NPT. Weight: approx. 100 g. Not recommended for hazardous locations due to electrostatic charging.
Field Transmitters
- iTEMP TMT162: Protection class: IP67, NEMA type 4x. Material: Die-cast aluminum or stainless steel 316L. Cable entry: 2x ½" NPT. SIL certification available.
- iTEMP TMT162 (Hygienic Applications): Material: Stainless steel 1.4435 (AISI 316L). Degree of protection: IP69K.
- iTEMP TMT142B: Protection class: IP66/67, NEMA type 4x. Material: Die-cast aluminum or stainless steel 316L. Optional integrated Bluetooth® interface.
Certificates and Approvals
Current certificates and approvals are available on the Endress+Hauser website.
Ordering Information
Detailed ordering information is available from local sales organizations or the Endress+Hauser Product Configurator online.
Accessories
Device-specific Accessories
- Mounting bracket (SS316L)
- Spare Parts Kit Cover (TA30R)
- Cable gland (½" NPT)
- Configuration kit TXU10
- Integrated overvoltage protection module (for TMT162 housing)
Service-specific Accessories
- Applicator: Software for selecting and sizing measuring devices.
- FieldCare SFE500: Configuration tool for Endress+Hauser and third-party field devices (supports HART, PROFIBUS, FOUNDATION Fieldbus, etc.).
- DeviceCare SFE100: Configuration tool for field devices using HART, PROFIBUS, FOUNDATION Fieldbus, etc.
- Netilion: IIoT ecosystem for plant performance optimization.
System Components
- Process display RIA15: Loop-powered display for 4 to 20 mA or HART® signals.
- RN42 active barrier: Wide-range power supply and active barrier for 4 to 20 mA signal circuits.
- RMA42 Process transmitter with control unit: Universal transmitter, loop power supply, barrier, and limit switch.
Documentation
Available documentation includes:
- Technical Information (TI): Technical data and accessories overview.
- Brief Operating Instructions (KA): Quick start guide.
- Operating Instructions (BA): Comprehensive guide for all life cycle phases.
- Description of Device Parameters (GP): Detailed parameter explanations.
- Safety Instructions (XA): Applicable safety information.
- Supplementary device-dependent documentation (SD/FY).
Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.
Official datasheet (PDF)
Curated from selected public technical reference material for discovery and preliminary comparison. This summary is not a substitute for a current certified manufacturer datasheet. Verify revisions and design limits before use.