• Offer Profile
  • Since 1978 we have been engaged in designing and producing electrical temperature sensors for many different branches of industry.

    Besides thermocouples and resistance thermometers, we also produce accessories, electronic devices and compensating and extension cables. Modern machines and tools, prudent stocking practices and established processes help our experienced staff to satisfy even the most unusual wishes and requirements.
Product Portfolio

  • Resistance thermometers

  • Whether you need a standard production article made according to national and international business standards or a special solution for your specific needs, resistance thermometers from HERTH have proven themselves in industrial metrology for decades. This applies to mechanical and plant engineering, and the chemical and pharmaceutical industries as well as the food industry and research and development. We offer resistance thermometers that can be screwed in, flange-mounted, used as an insulated resistance thermometer or as a stepped-resistance thermometer with ATEX approval for use in hazardous areas, on request with an integrated transmitter. Let us know your individual needs. We can also design and manufacture items to suit your specific requirements. With one-stop service, the fastest possible delivery and maximum quality.

      • Screw-in resistance thermometers

      • Connection heads made of
        • cast aluminium
        • plastics
        • cast iron
        • stainless steel
        • with screwed or hinged lid
        • lid for mounting measuring transmitters
        Number of RTD elements
        • 1
        • 2
        • 3
        Lead configuration
        • 2-wire
        • 3-wire
        • 4-wire
        Metal protection tubes
        up to 1000° C, depending on the material
        • 1.0305
        • 1.4541
        • 1.4571
        • 1.7335
        • Inconel 600
        Measuring insert acc. to DIN 43762
        • Pt 50/0, Pt 100/0, Pt 500/0, Pt 1000/0 ...
        • Ni 100/0, Ni 200/0, Ni 1000/0 ...
        For mounting the thermometers we offer
        • threads acc. to DIN ISO 228
        • metric threads
        • NPT threads
        • welding sockets
        Further constructions
        • flange thermometers with welded flanges acc. to different international standards
        • flange thermometers with adjustable flanges acc. to DIN 43734
        • weld-in thermometers
        • equipped with in-head-transmitter
        • according to other international standards
        • client-specific solutions

      • Sheathed Resistance Thermometers

      • Lots of RTD elements
        • 1
        • 2
        • 3
        Lead configuration
        • 2-wire
        • 3-wire
        • 4-wire
        Sheath diameters
        • ø 1,60 mm up to ø 8,00 mm
        Sheath material
        •  stainless steel
        • 1.4541
        • 1.4571
        • Inconel 600
        • Nickel
        Operating temperatures
        • up to 1000°C
        RTD elements
        • Pt 100/0
        • Pt 500/0
        • Pt 1000/0
        Types with
        • stripped ends
        • cable
        • round connectors
        • connecting heads in different types and sizes
        • probe- and cable length as required
        For mounting
        • the thermometers we offer
        • compression fittings with various threads
        • welded fittings
        • adjustable flanges
        Further constructions
        • graduated multi-sensor thermometers
        • other sheath materials
        • according to other specifications
        • different tolerance classes
        • client-specific solutions

      • Room Resistance Thermometer

      • Junction box made of
        • Light metal
        • Plastic
        • Cast iron
        Number of RTD elements
        • 1
        • 2
        • 3
        Lead configuration:
        • 2-wire
        • 3-wire
        • 4-wire
        Metal protection tubes
        • Ms, nickel-plated
        • Stainless steel
        RTD elements
        • Pt 50/0, Pt 100/0, Pt 500/0, Pt 1000/0
        • Ni 100/0, Ni 200/0, Ni 1000/0
        Further constructions
        • Junction box equipped in-head-transmitter


         

      • Custom-made products

        • flange thermometers with welded flanges acc. to different international standards
        • flange thermometers with adjustable flanges acc. to DIN 43734
        • weld-in thermometers
        • equipped with in-head-transmitter
        • according to other international standards
        • client-specific solutions

    • Thermocouples

    • HERTH designs, manufactures and supplies thermocouples for the most diverse requirements. Whether according to national or international working standards or as a special customized solution for your individual needs, our thermocouples always provide accurate measurements in furnace and plant engineering, the automotive industry, the aerospace industry, in power plants, the petrochemical industry, hardening plants, the plastics industry, surface and heat treatment and R&D. We supply our products as sheathed thermocouples from 0.25 mm in diameter, as profile thermocouples, as trailing thermocouples, for screwing in or flange-mounting, or as a tested model according to CQI 9 or AMS 2750E and with ATEX approval for use in hazardous areas, optionally available with an integrated transducer. Talk to us about your specific requirements profile: we design and manufacture exactly according to your needs and provide you with advice, service and the highest product quality from a single source.

        • Straight thermocouples

        • Type
          • Fe-CuNi (L) or (J)
          • NiCr-Ni (K)
          • Pt10%Rh-Pt (S)
          • Pt13%Rh-Pt (R)
          • Pt30%Rh-Pt6%Rh (B)
          Connection heads from
          • light metal
          • plastics
          • cast iron
          • with screwed or hinged lid
          • with lid for measuring transmitters
          Metal protection tubes
          up to approx. 1200°C, depending on the material
          • ø 15 mm
          • ø 22 mm
          • ø 26 mm
          • 1.4762
          • 1.4841
          • 1.4749
          • steel enamelled
          • optionally with or without inner tube from ceramics
          Supporting tubes from steel
          • ø 15 mm
          • ø 22 mm
          • ø 32 mm
          Ceramics protection tubes
          up to approx. 1800°C, gastight or porous (depending on ceramics type)
          • type 530
          • type 610
          • type 710
          • optionally with or without inner tube from ceramics
          Nominal lengths
          (measured from bottom to lower edge of connection head) acc. to DIN between 180 mm and 2000 mm

          For mounting
          The thermocouples we offer
          • adjustable flanges
          • mating flanges
          • compression fittings with various threads
          Further constructions
          • protection tubes from Kanthal, Inconel or HER
          • thermocouple NiCrSi-NiSi (N)
          • different protection tube diameters
          • different nominal lengths
          • client-specific solutions
          • equipped with in-head-transmitter
          • testable type acc. to datasheet DB_006_S1v1engl

        • Angle thermocouples

        • Type
          • Fe-CuNi (L) or (J)
          • NiCr-Ni (K)
          • PtRh-Pt (S)
          • single or double
          • other thermocouple types are also available
          Light metal connecting head
          • with bolted cover or quick-locking cover
          Metal protecting tubes
          up to 1200°C, depending on the material
          • technical pure iron
          • steel
          • enamelled steels
          • heat-resistant steels
          • stainless steels
          • titanium
          Supporting tubes from steel
          optionally
          • heat-resistant steel
          • stainless steel
          Type I
          • bent from one piece
          Typ III
          • with elbow fitting
          Further constructions
          • sheathed measuring insert
          • client-specific solutions
          • protection tubes from
          • graphite
          • special steel
          • HER
          Applications
          • heat treatment
          • salt baths
          • molten baths
           

        • Sheathed Thermocouples

        • Numbers of thermocouples
          • 1
          • 2
          • 3
          Sheath diameters
          • ø 0,25 mm bis ø 9,52 mm
          Sheath materials
          • stainless steel
          • 1.4541
          • 1.4571
          • 1.4550
          • Inconel 600
          • heat resisting steel 1.4841
          • precious metal Pt10%Rh
          • available with insulated hot junction or hot
          • junction welded in the sheath material
          • probe and cable length as required
          Operating temperatures
          up to 1600°C, depending on the type
          • NiCr-Ni (K)
          • Fe-CuNi (L) or (J)
          • Cu-CuNi (U) or (T)
          • NiCrSi-NiSi (N)
          • PtRh-Pt (S)
          • acc. to EN 60584-2
          Types with
          • stripped ends
          • round connectors
          • mini or standard sized connectors
          • compensating cable and connector
          • welding pads for surface measurements
          For mounting
          • the thermocouples we offer
          • welded fittings
          • adjustable flanges
          • compression fittings with various threads
          Further constructions
          • high-temperature thermocouples up to 2200°C with sheath made of
          • Tantalum
          • Molybdenum
          • with thermocouples made of
          • Tungsten-Rhenium
          • Pt30%Rh-Pt6%Rh
          • graduated multi-hot junction thermocouples
          • other sheath materials
          • according to other specifications
          • other tolerance classes
          • client-specific solutions

        • Straight thermocouples

        • Type
          • NiCr-Ni (K)
          • NiCrSi-NiSi (N)
          • PtRh-Pt (S, R, B)
          • single or double
          Light metal connecting head
          • with bolted cover or quick-locking cover
          • with high cap for mounting measuring transmitters
          Metal protection tubes
          up to approx. 1200°C
          • ø 15 mm
          • ø 22 mm
          • from material number 1.4762 or 1.4841
          • other materials available
          Ceramic protection tubes
          up to approx. 1800°C, at precious metal thermocouples
          • Typ 610
          • Typ 710
          Supporting tubes from steel or heat-resistant steel
          • ø 22 mm
          • ø 32 mm
          For mounting
          the thermocouples we offer
          • adjustable flanges
          • mating flanges
          • compression fittings with various threads
          Further constructions
          • client-specific solutions, e.g. with a test tube
          • protruding from the protection tube
          Applications
          • In correspondence with DIN ISO 9000 ff
          • Indication of divergence against a reference
          • sensor during operation, e.g. in combination with
          • our digital thermometer DST-K5 and hand held
          • probe, on request calibrated
          • heat treatment furnaces
          • forges
          • hardening baths
          • furnace construction

        • Custom-made thermocouples

        • Typ
          • As a thermocouple with up to 3 thermocouples
          • As a resistance thermometer with up to 2 measuring resistor
          Thermocouple types
          • NiCr-Ni (K)
          • Fe-CuNi (J or L)
          • Cu-CuNi (U or T)
          • NiCrSi-NiSi (N)
          • PtRh-Pt (S, R or B)
          Measuring resistor
          • Platinum measuring resistor
          • Nickel measuring resistor
          Temperature range
          According to sensor typ and construction from -200°C to 1600°C depending on sensor typ

          The following mounting variants are possible
          • screw on
          • weld on
          • installation with pipe clamps
          • adhering by magnet
          For pipe wall measurements all types are available with a radius adapted to the pipe diameter.

          The use of all surface thermometers applies
          The greater the temperature gradient between the surface to be measured and the ambient air, the more important is a thermal isolation of the measuring point from the environment. In order to optimize the heat transport from the surface to be measured to the sensor, heat conducting pastes should be used if possible.

      • Components and Accessories

      • We can provide you with appropriate accessories and all the parts you need to install our HERTH temperature sensors. We can provide you with compression fittings, threaded sleeves and flanges. In addition, we always stock a wide range of thermoelectric leads and compensating cables or copper connection cables. Our transducers, controllers, digital thermometers, infrared thermometers and data loggers are highly available as well. Besides advice and designs, we support you with additional services relating to temperature measurement, such as calibrations in our own laboratory or calibrations on your premises.

          • HER6-/HER7 Protection Tubes

          • HER6 or HER7 protection tubes are made of advanced ceramics. Technical ceramics are well known, particularly wear-resistant and very good corrosion and heat resistant. However, in many cases, their fragility prevented a wide acceptance in practice. This relatively new ceramic is particularly suitable for applications, which require a combination of strength, wear resistance and mechanical and thermal shock resistance. HER6-and HER7 ceramics are resistant against molten non-ferrous metals. This, together with a combination of train and very high bending strength up to 1250 ° C and very good thermal conductivity, results in the following advantages:
            • Long service life in non-ferrous metal smelt (1st choice for aluminium)
            • No build-up of metal or slag to the outer surface
            • No contamination of the liquid metal, very good thermal conductivity
            • high mechanical strength and resistance to gas in the high temperature range
            Features of the material HER7
            HER7 was designed specifically for high stress at difficult conditions.HER7 thermocouple protection tubes are intended for use where the main focus is on maximum resistance against abrasion and excellent thermal shock resistance. We thus find an unique combination of high toughness and hardness in this material. HER7 can be permanently used at 1300 ° C, it’s short-term heat resistance is up to 1600 ° C.

          • Adjustable flanges

          • Adjustable flanges
            acc. to DIN 43734 for mounting thermometers
            in furnaces and exhaust systems.

            Weld neck flanges
            to be welded at furnaces and exhaust
            systems used in combination
            with adjustable flanges DIN 43734; gas-tight up to 1 bar (300° C).

          • ADJUSTABLE COMPRESSION FITTINGS

          • Compression fittings for the installation of thermometers in furnaces and exhaust systems. Adjustable, gas-tight up to approx. 3 bar (depending upon pipe-Ø D)

            Specification
            Fitting material: galvanized steel or stainless steel
            Seal: graphite

          • Radio systems

          • Thermocouple socket boxes serve to simplify the process of replacing the thermometers in thermotechnical systems of all kinds. The socket boxes have standardized connectors for thermocouple plugs and can thus be used for all standard thermocouples.
            The disconnection/connection of the thermometers from/to the controller takes place by unplugging/ plugging in the coded plug. This thus precludes the risk of polarity reversal when replacing the thermometers.
            Inspection of the wiring for the controller is very easy as you only need to plug in a testing instrument.

            Thermocouples of the following types:
            • NiCr-Ni (K)
            • NiCrSi-NiSi (N)
            • PtRh-Pt (S, R, B)
            Number of plug-in positions
            • as necessary

            Casing made of aluminium

            • with bolted lid
              Casing size depending on number of plug-in locations
               
            Further versions
            Also available for other standard thermocouple pairs.
            Intended use
            • Heat treatment furnaces
            • Hardening plants
            Furnace construction

          • Thermocouple Socket Boxes

          • The HFU 700 device group is a system for the wireless transmission of temperature and moisture values. Thermocouples and resistance sensors are used as sensors. In this way, customer-specific solutions can be implemented in conjunction with different sensors. Data transmission takes place in the 2.4 GHz range. A star-shaped wireless personal area network (WPAN) is built up. The wireless modules used work in accordance with the IEEE802.15.4 standard for low-rate WPANs.

            Networks can be set up with up to 240 transmitter modules with one receiver. 2 wireless actuators can be used to increase the range. The networks can also overlap without interfering with each other. These sensors are intended to be used for carrying out measuring tasks in cases where wiring would be disruptive or impossible. Possible applications are, for example, measuring the temperature at rotating and mobile parts or for fermenting and smoking processes in the food industry. Wireless solutions are also practical when renovating existing applications. The receiver is supplied with 24 V. The transmitters work with a lithium battery (3.3 V); these batteries have a lifespan of up to 2 years, depending on the necessary transmit rhythm. The transmitting capacity amounts to a max. 10 mW. It is thus possible to bridge distances of 50 to 300 m (depending on the terrain or constructions). Through the use of actuators, these can be further increased. Data transmission takes place bidirectionally, resulting in the high degree of interference resistance and availability of the network.