Controller, Recorder, Datalogger

Temperature sensor controllers have a universal input suitable for most common thermocouple sensor as well as Pt100. Low or standard 230V power supply can be selected.

Outputs options: alarm – control output – or 4÷20 mA 

Two displays: upper (red) colour presents temperature of process; lower (green) colour presents set temperature.

Compensation and Extension Cables – Plugs and Sockets

Compensation and extension cables for thermocouples are the element of measuring installation connecting thermocouple sensor with measuring device e.g. controller, indicator or temperature recorder. Extension cables are made of the same materials as thermocouples, whereas compensation cables are made of substitute materials with properties similar to thermocouples. Cable insulation are selected according to ambient conditions and operating temperature.

Plugs and socket are components of measuring systems used for connection of temperature sensors with a measuring device such as controller, temperature indicator or recorder. They are also used for connections and extensions measuring lines.

Connection Heads for Temperature Sensors

Connection heads are integral elements of temperature sensors, available also as separate components. They are made primarily of aluminium alloys, but stainless steel, polyamide or noryl heads are also available. A wide range of connection heads allows head selection for a variety of applications: transmitter mounting, digital LCD display, intrinsically safe or flameproof certified types, 2 table glands, etc.

Wireless Transmission

AirGate-Modbus is a wireless multifunctional gateway that allows the transparent and easy insertion of wireless branches into existing wired RS485 networks. The AirGate-Modbus has four operation modes, Modbus Master, multiplexer, USB RS485 converter and simple wireless RS485 extension. A proprietary protocol based on IEEE 802.15.4 facilitates operation in star mode, allowing the connection of several wireless segments to an existing Modbus RS-485 network.

The Transmitter and wireless set allows for wireless temperature measurement at a distance around 3.5 km. The transmitter has the shape of a standard head mounted transmitter, so it can be installed into a standard connection head. It works with most standard thermocouples and resistance sensors. The wireless set is equipped with a 4÷20mA analog output and digital MODBUS RTU, it can work with sixteen transmitters.

Rail or Head mounted Temperature Transmitter

Rail or Head mounted temperature transmitters are applicable to converting resistance or voltage of temperature sensor to standard current signal 4-20 mA, 0-10V, HART protocol

Input parameters:

  • resistance RTD 2, 3 or 4 wire, Pt100, Pt500, Pt1000, Ni100, Ni1000
  • thermocouple: J, K, T, N, E, R, S, B
  • resistance, voltage, current

Options:

  • universal transmitter, sensor error correction, intrisically safe, zero point adjustment in full range
  • parameter configuration with USB interface, HART

Thermocouple Sensor

Thermocouples are the most commonly used temperature sensors. Thermocouples are self-powered, (require no excitation current), can operate over a wide and high temperature range, and have fast response times.

Two dissimilar metal wires are joined together forming an electrical junction. The temperature difference of the two dissimilar conductors produces a temperature dependent voltage as a result of the thermo electric effect, (Seebeck effect). The voltage is measured and used to calculate the temperature.

There are different hot junction types: insulated hot junction (SO), grounded hot junction (SP), one hot Junction for 2 TC insulated from the sheath (SOA), hot junctions insulated from each other and from the sheath (SOB).

Thermocouples have a built in electronic cold junction compensation to correct the missing thermoelectric voltage due to the fact that the thermocouple cold end at the instrument is not at 0°C.

There are several types of thermocouples made from different materials for different temperature ranges and different sensitivities. The most commonly used is the K type. Here a list of the common types of thermocouples:

Industrial Temperature Devices

Industrial Temperature Measuring Devices describe probes with

  • one (or more) temperature sensor elements (usually RTD or Thermocouple)
  • a connection head (head sensors) or plugs, surface magnets/clips (cable sensors for machinery or surface measurement)
  • a protection tube or Thermowell

Sensor elements (inserts) are available as replaceable or non-replaceable types. They include the sensing wires, insulation materials and a shaft. Mineral insulated inserts are bendable and protect against vibrations, ceramic types are used for high temperatures.

Head sensors include the sensing elements which is connected to connection heads or head mounting transmitters (A). They can be fitted to the pipe or to extension tubes (Thermowells) by flange, threaded or with a clamp on (for hygienic aplications).

Cable sensors are used for

  • movable or replaceable parts of machines and devices, (compressor, turbine,…)
  • outer surface measurement of devices and machines, especially their bodies, blocks

The inserts are connected to a head (A), exposed wire ends (B), with sleeves (C), plugs (D) and/or compensation cables (E, F).

Thermowell Protection Tubes

A thermowell is a pressure tight tube which protects a temperature sensing element, (RTD, TC or other sensors) from corrosion, high presure or high velocity of the process media. The tube can be welded, flanged, threaded or clamped (sanitary) to a vessel or pipe.It allows the sensing element to be removed for service or repair without closing down the process line.

Quality thermowells are machined from drilled barstock (stainless steel material) to ensure a good sensor fit. Teflon, Alumina or ceramic materials are used for special high temperature or corrosive applications. A spring loaded temperature sensor ensures metal to metal contact with the tube. Tapered or stepped shapes of the tube improve the response time.

Mathematical Wake Frequency Calculations ensure that the thermowell design is robust enough to withstand the various stresses and strains produced by the process media, (turbulences/wakes, temperature, etc.) to avoid that the process media wake frequencies coincide with the tube frequencies which would lead to cracks and destruction.

We provide wake frequency calculation and can offer fully explosion proof solutions for the complete units (housing, sensors and protection tubes).

RTD Sensor

An RTD is a temperature sensor to measure temperature using the principle that the resistance of a metal changes with increasing or decreasing temperature. They required an electrical current (exitation current) which is transmitted through a piece of metal, called the RTD element or resistor. RTDs have a near linear response to temperature changes, they are stable and accurate and give repeatable responses.

Most RTD elements consist of a length of fine coiled wire (most commonly Platinum, Nickel or Copper)
wrapped around a ceramic or glass core. The element is usually quite fragile, so it is often placed inside a sheathed probe to protect it.

RTDs are available in 2, 3 and 4 wire configuration. (2 wire for short lead length,  3 wire (most commonly used) adds a line for the exication current to cancel the wire resistance effect, 4 wire config for highest accuracy)

The PT100 probe (el. resistance of 100.00 Ohm at 0°C) is most commonly used in industrial applications. PT500 (500 Ohm at 0°C) and PT1000 (1000 Ohm at 0°C) probes are available.

Machinery Thermometers

The measuring principle is based on the volumetric temperature expansion of the filling liquid in the glass tube. The expansion of the filling liquid is indicated on a scale. Machinery- glassthermometers are used for temperatures from -60°C up to +600°C.Accuracy is ± 1,6% of full scale deflection.

STU 01 Industrial Gas Filled Thermometer

Inert gas filled expansion system, SS Case & Stem, EN 13190 Standard, Instrument Glass, Neopren Rubber Gasket, fillable, opt. with Thermowell, bottom, lower back, every angle entry, adjustable. View Products

  • Dial Size:  

4″ (100mm)
5″ (125mm)
6″ (150mm)
8″ (200mm)
10″ (250mm)

  • Connection:

3/8″ BSP, 1/2″ BSP
1/2″ NPT

  • Range:

0 to 100°C

  • Stem Diameter: 

6mm, 6.5mm, 8mm, 9.5mm, 10mm, 12mm

  • Stem length: 

100mm, 120mm, 130 mm

  • Capillary Length: 

1m, 1.5m, 2m

STU 02 Industrial Bimetallic Thermometer

SS Case & Stem, EN 13190 Standard, Sheet Glass, Neopren Rubber Gasket, fillable, opt. with Thermowell, bottom – back – every angle entry, adjustable.

  • Dial Size:  

4″ (100mm)
5″ (125mm)
6″ (150mm)

  • Connection:

3/8″ BSP, 1/2″ BSP, 3/4″ BSP, 1″ BSP
1/2″ NPT, 3/4″ NPT, 1″ NPT

  • Range:

-20 to 500°C

  • Stem Diameter: 

6mm, 6.35mm, 8mm, 9.5mm, 10mm, 12mm

  • Stem length: 

Customized

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