Brand: WIKA

WIKA TG53 Process Bimetal Thermometer, ASME B40.200

Name: WIKA TG53 Bimetal Thermometer, 3 in, ASME B40.200
Brand: WIKA
SKU: TG53

Description

WIKA TG53 process bimetal thermometer per ASME B40.200

The WIKA TG53 is a 3 inch (80 mm) bimetal dial thermometer made to the ASME B40.200 standard for process plants. It has a hermetically sealed stainless steel case with IP66 (NEMA 4X) protection, a dished anti-parallax dial and an accuracy of ±1 % of full scale (grade A per ASME B40.200). It is intended for the chemical and petrochemical, oil and gas, power generation and water and wastewater industries, and it is offered with filling and damping options for vibrating service. Seven Star LLC supplies the TG53 in Oman and the GCC as an independent supplier in Muscat; this page lays out the connection, scale and stem choices so that an RFQ can be built from it.

Case styles and connection locations

Connection location	Description	Use
Back mount (axial)	Stem leaves the back of the case in line with the dial axis	Panels and vessels where the dial faces the operator head-on
Lower mount (radial)	Stem leaves the bottom of the case through an elbow	Pipes viewed from the side
Back mount, adjustable stem and dial	Articulated joint swivelling 90 degrees and rotating 360 degrees	Awkward positions where the dial must be turned to the viewer after installation

WIKA lists the adjustable-stem version as enabling optimal process fit: because the dial can be tilted and rotated after the stem is installed, it avoids the problem of a rigid thermometer ending up facing the wrong way. The elbow behind the case on lower mount versions and the articulated joint are in stainless steel 304.

TG53 technical specifications

Parameter	Specification
Manufacturer / part number	WIKA / TG53 (data sheet TM 53.02)
Type	Bimetal thermometer, process version per ASME B40.200
Nominal size	3 in [80 mm]
Measuring element	Bimetal coil
Accuracy	±1 % of full scale, grade A per ASME B40.200
Case and ring	Stainless steel 304 or 316 (option)
Window	Instrument glass, laminated safety glass or polycarbonate (shatterproof)
Ingress protection	IP66 (NEMA 4X), hermetically sealed case
Stem and wetted parts	Stainless steel 304; 316 option for stem and process connection
Stem diameter	1/4 in [6.35 mm] for the standard line; other diameters in the stem table
Insertion length l1	Standard lengths include 2.5, 3, 4, 5, 6, 7, 9 and 10 in depending on mount; overall L = l1 + 40 mm
Process connections	Standard male thread (G ½ B or ½ NPT shown), plain stem, sliding compression fitting, compression fitting with support tube
Case filling	Without, or silicone oil up to 250 °C at the probe; damped bearing bushing with inert gel
Versions	Standard, oil- and grease-free, or silicone-oil-less
Zero adjustment	Screw on the rear of the case, with a screwdriver
Pointer	Adjustable pointer version listed
Scale	Single scale or dual scale in °C/°F or °F/°C

Scale ranges

The datasheet lists many ranges. In Celsius, examples include -70 … +70, -50 … +50, -50 … +200, -50 … +300, -50 … +500, 0 … 120, 0 … 150, 0 … 200, 0 … 250, 0 … 300, 0 … 400, 0 … 500 and 0 … 600 °C, with scale spacing from 1 to 10 °C according to span. In Fahrenheit the offering includes -100 … +150, 0 … 250, 30 … 400, 100 … 800 and 200 … 1,000 °F. Choose a range so that the normal working temperature sits in the middle third of the dial, because accuracy is a percentage of full scale and the pointer is easiest to read there.

Overtemperature resistance

The thermometer tolerates excursions above the range end by a stated margin: for ranges with a top between 50 and 120 °C the end of scale plus 100 % overload safety, for ranges above 120 up to 280 °C plus 50 %, and for higher ranges the limits tighten until, in the 400 to 600 °C range, the full scale is the maximum. WIKA notes that the overtemperature resistance applies only in non-hazardous areas.

Damping for vibrating service

The datasheet says the TG53 offers the widest variety of damping options in the industry. A silicone-oil case filling cushions the pointer against vibration up to 250 °C at the probe, and a damped bearing bushing with inert gel dampens the movement without liquid. Choose a filled version for pumps, compressors and piping with strong pulsation, and a dry case with the damped bushing where oil is undesirable. Oil- and grease-free and silicone-oil-less versions exist for clean services.

Thermowell fit and installation

A bimetal thermometer should normally be installed in a thermowell when the process is pressurised, flowing or hazardous, so the thermometer can be removed without opening the system. The plain stem and compression fittings let you match the instrument to existing wells; a union-nut design (design 3) allows rotation of the case. Check that the immersion length is at least the minimum for a bimetal coil (the coil sits in the lower part of the stem) and follow the stem length chart for the correct l1. Do not dismantle the hermetic case; use the rear screw to trim the zero point.

Where the TG53 sits in WIKA’s bimetal range

Within the range, the TG54 is the process bimetal thermometer to EN 13190, which uses a different case and connection convention, while the TG53 follows the ASME B40.200 approach, so choose it when your specification is written to US-style standards, with NPT threads and inch lengths.

Applications in Oman and the GCC

WIKA lists the chemical and petrochemical industries, oil and gas, power generation and water and wastewater, in harsh and aggressive conditions and high vibration. In the Gulf this covers local indication of heat-exchanger and cooler temperatures, pump skids, steam and condensate lines, desalination plants, and offshore or coastal facilities where 316 stainless steel and a sealed case resist salt air and humidity. Sun-baked outdoor locations favour a laminated safety glass or polycarbonate window and a dual scale, if your operators are used to both units.

TG53 ordering checklist

Connection location: back mount, lower mount or adjustable stem and dial
Scale range and unit (single or dual)
Stem diameter, insertion length l1 and wetted material (304 or 316)
Process connection: thread size, plain stem or compression fitting
Window material and case filling or damping
Oil- and grease-free or silicone-oil-less version
Thermowell dimensions if one is already installed

Information to send with an RFQ

Send the tag, range, stem length, connection standard, thermowell data, quantity and certificate needs, or send the data sheet reference of the thermometer being replaced.

Documents and quotation

The WIKA data sheet TM 53.02 for the TG53 is attached on this page. Send us the specification and quantity for a quotation from Muscat as an independent supplier.

Datasheets & Documents

Datasheet WIKA TG53 Datasheet Download

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About brand

WIKA is the German manufacturer of pressure, temperature, level and flow instruments, best known for its pressure gauges. Alexander Wiegand and Philipp Kachel founded it on 2 January 1946 in Klingenberg am Main, Bavaria. The name comes from the first two letters of their surnames. WIKA is still run by the Wiegand family and is headquartered in Klingenberg.

Seven Star LLC is an independent supplier in Muscat. We list WIKA pressure gauges, diaphragm seals, transmitters, switches, thermometers and thermowells, and supply them to plants, contractors and panel builders in Oman and the GCC by model and order code.

WIKA company profile

Established	2 January 1946, Klingenberg am Main, Germany, by Alexander Wiegand and Philipp Kachel
First products	Mechanical pressure and temperature gauges
Ownership	Family-owned; managed by Alexander Wiegand, grandson of the founder, since 1996
Product families	Pressure gauges, diaphragm seals, pressure transmitters and switches, thermometers, RTDs, thermocouples, thermowells, calibration equipment, level and flow instruments

Milestones

1946: Alexander Wiegand and Philipp Kachel found the company in Klingenberg am Main on 2 January; pressure gauge production starts at the end of the year. The name WIKA comes from the first letters of their surnames.
1951: Konrad Wiegand, the founder's son, takes over management.
1967: Ursula Wiegand leads the company after her husband's death.
1986: The company is reunited with the Kachel thermometer factory, which Philipp Kachel had set up after leaving in 1956.
1994: Certification to DIN ISO 9001.
1996: Alexander Wiegand, the founder's grandson, becomes head of the company.

WIKA products we list

Family	Models	Typical use
Bourdon tube pressure gauges	111.10, 111.12, 212.20, 213.53, 232.50, 233.50, 232.30/233.30 safety pattern	HVAC and utilities (111 series) to process plants (23x series in stainless steel)
Diaphragm and differential pressure gauges	432.50, 732.51, 700.01, DPGT43	Low pressures, viscous or dirty media, and filter differential pressure
Diaphragm seals	990.10, 990.27	Separating the gauge from corrosive, hot or clogging media
Transmitters, switches and test gauges	A-10, UPT-20, PSM01, CPG1500	4-20 mA pressure signals, switching, and precision calibration checks
Thermometers	TG54, Model 55, A52, 73 gas-actuated	Local temperature indication on pipes, vessels and HVAC
Temperature sensors and thermowells	TR10, TR12-B, TR33, TC10-B, TW10 flanged, TW15 threaded	RTD and thermocouple measurement in process lines

The WIKA model number tells you the build. In 232.50, the first digit 2 means stainless steel wetted parts, the second digit 3 means a liquid-fillable case, and ".50" is the case style. The 111 series uses copper alloy wetted parts and suits water and air. Where the medium is corrosive, very hot or would block the gauge, a diaphragm seal such as the 990.27 keeps it away from the Bourdon tube. For temperature, a thermowell like the TW10 lets you remove the sensor without opening the process.

Where WIKA instruments are used

In Oman and the GCC, WIKA gauges, transmitters and thermometers are used in oil and gas, refining and petrochemical plants, power and desalination, water networks, district cooling and HVAC, and on skids and machines from OEMs.

Ordering WIKA instruments: what we need

Send the model, dial size (for example 63, 100 or 160 mm), range and unit, connection size and position (lower or back mount), accuracy class and whether liquid filling is needed. For diaphragm seals and thermowells, add the process connection, materials and insertion length.

Facts checked against WIKA company history, October 2026.

Browse WIKA products by category: Pressure Instrumentation, Temperature Instrumentation.

FAQ

Questions about the WIKA TG53 Process Bimetal Thermometer, ASME B40.200

Answers from our engineering team on installation, compatibility and integration.

01What standard does the TG53 follow?

It is made to ASME B40.200 with grade A accuracy of plus or minus 1 percent of full scale, with a 3 inch (80 mm) dial.

02How is the case protected?

The case is hermetically sealed in stainless steel with IP66 (NEMA 4X) protection. Case and stem can be made from 316 stainless steel as an option.

03Can it handle vibration?

Yes, options include silicone-oil case filling up to 250 degrees C at the probe and a damped bearing bushing with inert gel.

04What mounting styles are available?

Back mount (axial), lower mount (radial), and a back mount with adjustable stem and dial that swivels 90 degrees and rotates 360 degrees.

05How is the zero point adjusted?

A zero adjustment screw on the rear of the case allows a quick, limited reset of the reference temperature with a screwdriver.