Pt100 and Pt1000 resistance thermometers
Manufacturer from Hanau since 1970 — ATEX and IECEx under our own certification, single units to series.
A resistance thermometer measures temperature via the electrical resistance of a platinum sensor. GHI manufactures Pt100 and Pt1000 sensors to DIN EN 60751 — from measuring inserts for existing thermowells and bendable sheathed resistance thermometers to thermowell thermometers with flange to DIN 43772. For hazardous areas we supply intrinsically safe versions with GHI's own ATEX and IECEx approval. You specify diameter, insertion length, process connection, cable and connector; we build to your drawing, your sample or your description.
ATEX and IECEx — intrinsically safe up to zone 0, under our own certification
GHI is itself an ATEX manufacturer. The EU type-examination certificate EPS 25 ATEX 1 060 X and the IECEx certificate IECEx EPS 25.0012X (Bureau Veritas, notified body 2004) are issued to GHI — the WME measuring inserts and WML sheathed resistance thermometers carry our own marking. No third-party certificate, no bought-in parts, and the Ex version adds no extra lead time.
Marking and parameters
EPS 25 ATEX 1 060 X, Rev. 1 · IECEx EPS 25.0012X, Issue 1 · Cable sensors WKF: IBExU 10 ATEX 1062 X (Ex eb/tb)
- Without thermowell: II 1G Ex ia IIC T1…T6 Ga · II 2G Ex ib IIC T1…T6 Gb · II 2D Ex ib IIIC T440 °C…T63 °C Db
- With thermowell: II 1/2G Ex ib IIC T1…T6 Ga/Gb · II 1/2D Ex ib IIIC T200 440 °C…T200 63 °C Da/Db
- Measuring range in the hazardous area −50 … +450 °C · ambient temperature at the connection head −40 … +85 °C
- Intrinsic safety parameters: Ui 30 V · Ii 70 mA · Pi 500 mW (total over all contacts) · Ci 250 pF/m · Li 50 µH/m
- Standards: EN IEC 60079-0:2018 · IEC 60079-11:2023 · EN IEC 60079-26:2024
Type of protection intrinsic safety “i” — connection to certified intrinsically safe circuits. We do not offer flameproof enclosures (Ex d). The approval ends above +450 °C; tell us the zone, equipment group and temperature class and we will design the version.
Which sensor suits your measuring point?
The design almost always follows from the installation. Choose the row that matches your measuring point — the design page has a separate page for each series with dimensional drawing, technical data and configurator.
| Installation | Design | Typical | |
|---|---|---|---|
| Pipeline or vessel under pressure | With metal thermowell | 11 designs to DIN 43772, Ø 6–14 mm, with connection head | Select → |
| Narrow bore, bends, fast response | Sheathed resistance thermometers | Ø 1.0–6.0 mm, bendable, with cable, free ends or connector | Select → |
| Thermowell already installed | Measuring inserts | Spring-loaded and replaceable, Ø 3.0 or 6.0 mm, also in ATEX | Select → |
| Machinery and plant engineering, free wiring | Cable sensors | Sensor tip with permanently attached cable, length to specification | Select → |
| Air and duct temperature | Air temperature sensors | Duct, room and outdoor sensors to specification | Enquire → |
| Measurement on the pipe surface | Surface sensors | Clamp-on sensor with strap or pipe clamp | Enquire → |
All designs at a glance
11 DESIGNS
With metal thermowell
Screw-in, weld-in or flange. Seamless thermowell to DIN 43772, spring-loaded replaceable measuring insert.
ATEX with certified WME measuring insert
Ø 6–14 mm · up to +600 °C · head form B, DAN/BUZ, plastic
4 VERSIONS
Sheathed resistance thermometers
Mineral-insulated sheath, bendable, fast response. With connecting cable, free ends or connector.
ATEX as WML — intrinsically safe up to zone 0
Ø 1.0–6.0 mm · stranded wires, LEMO, M12 · ATEX as WML-EX
FOR EXISTING THERMOWELLS
Measuring inserts
Spring-loaded and replaceable, with terminal block, stranded wires or head-mounted transmitter. The quick route to a replacement.
ATEX as WME — intrinsically safe up to zone 0
Ø 3.0 / 6.0 mm · 1× or 2× Pt100 · also ATEX
FIXED CABLE
Cable sensors
Sensor tip with permanently attached connecting cable for machinery and plant engineering, optionally with bend-protection spring or connector.
ATEX as WKF — Ex eb/tb, IBExU 10 ATEX 1062 X
Ø 2.5–6.0 mm · silicone, PTFE, glass fibre
DUCT AND ROOM
Air temperature sensors
For air, duct and room temperature, with duct flange or weather protection. Version to your specification.
No standard version in the shop yet
CLAMP-ON SENSORS
Surface sensors for pipelines
Measurement on the pipe surface without intervening in the process, with strap or pipe clamp, also in ATEX version.
No standard version in the shop yet
Resistance thermometers in detail
Pt100 or Pt1000 — which fits better?
A Pt100 has a resistance of 100 Ω at 0 °C and is the industry standard. A Pt1000 gives 1,000 Ω at 0 °C. The ten-times higher resistance reduces the influence of the connecting cable — useful wherever long cables are run or 2-wire measurement is used. We make both in the same designs.
Accuracy classes to DIN EN 60751
The class defines how far the sensor may deviate at a given temperature. The tolerance increases with temperature:
- Class AA: ± (0.10 + 0.0017 · |t|) °C
- Class A: ± (0.15 + 0.002 · |t|) °C
- Class B: ± (0.30 + 0.005 · |t|) °C
- 1/3 DIN class B: one third of the class B tolerance
- 1/10 DIN class B: one tenth — for test benches and reference measurements
2-, 3- or 4-wire circuit
In a 2-wire circuit the cable resistance enters the measurement in full. The 3-wire circuit compensates for it and is the usual choice in process engineering. The 4-wire circuit eliminates it completely and is used for reference and laboratory measurements. At Ø 6.0 mm, 2 × 4-wire is also possible.
Thin-film or ceramic wire-wound
Thin-film resistors are the standard: small, fast and insensitive to vibration. We use ceramic wire-wound elements where high temperatures or long-term stability are required. Unless specified otherwise, we supply thin-film.
Materials, temperature and process connection
Thermowells and sheaths in 1.4571 (F316Ti), 1.4404 (F316L) and Alloy C-4, other materials on request. Depending on the design, Pt sensors measure up to +600 °C; above that, thermocouples take over. Process connections: G 1/2", G 3/4", G 1", 1/2" NPT and special threads, plus flanges DN 25–DN 50 in PN 16 and PN 40.
Calibration and testing
On request we supply the sensor with factory calibration and test report at agreed measuring points. Insulation testing and an inspection certificate are also available — please state the required scope of testing in your enquiry.
Made in Hanau
GHI has been building temperature sensors since 1970 and manufactures at its Hanau site. Since January 2025 we have also continued the series of Schramm GmbH's temperature measurement business — so replicas to old drawings or from a returned sample are possible, even if the sensor is decades old.
Higher than +600 °C?
Above around 600 °C, thermocouples take over. Types K and N measure up to +1,100 °C, with ceramic protection tube up to +1,300 °C.
Typical industries
Chemicals & petrochemicals
Pharma & biotechnology
Food & beverages
Plastics & extrusion
Energy, power plants & hydrogen
Furnaces, heat treatment, glass & foundry
Machinery & plant engineering
Automotive & test benches
Laboratory, measurement & testing
Please contact us
We are happy to help with questions about products, versions and delivery times.
Dennis Kühne
Phone: +49 6181 504 93 18
Mobile: +49 160 91437153
E-mail: info@ghi-gmbh.de
