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Data Loggers for Temperature Measurements
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Temperature measurements are among the most common data logging applications. There are 4 main types of temperature sensors that are used with data loggers for measuring temperature:
- Thermocouples
- RTD
- Thermistor
- Semiconductor Sensors
Our Selection of Temperature Data Loggers Includes:
- Temperature Data Loggers Supplied with Sensors
- TandD TR-5x Series - Compact single channel data loggers
- TandD RTR-5x Series - Compact single channel data loggers with Wireless Interface
- TandD TR-71x Series - 2 External Sensors with USB or Ethernet Interfaces
- Temperature Data Loggers with Thermocouple Inputs
- OQ610 - 6 K- or T-type Inputs with USB Interface
- dataTaker DT1700 Series - 1-, 2-, or 4-channel J-, K-, T-, E-, R- or S-type inputs with Serial Interface
- Temperature Data Loggers with RTD Inputs
- Infinite Informatics iLog Series - 2 RTD Inputs with a Serial, Ethernet or GSM Interface
- TandD TR-81 - 2 Inputs with a Serial Interface
- Temperature Data Loggers with Thermistor Inputs
- General Purpose Data Loggers with Thermocouple, RTD and Thermistor Inputs
- dataTaker DT80 Series - Up to 15 Inputs with USB, Serial and Ethernet Interfaces
- dataTaker DT800 - Up to 42 Inputs with Ethernet and Serial Interfaces
- dataTaker DT50 Series
- dataTaker DT500/DT600 Series - Up to 90 Inputs with Serial Interface
- Grant Squirrel SQ2020/SQ2040 - Up to 32 Inputs with USB Interface
- KineticSystems DAQ400/DAQ500 Series - High Speed with up to 64 Inputs and Ethernet Interface
- Nimtech FrontDAQ - High Speed with 20 Inputs and an A/D per channel
- Fourier Systems DaqPRO- 8 Inputs with USB Interface
A short note on temperature sensors:
Thermocouples which generate a voltage proportional to temperature are the most common type of temperature sensor and are widely used where cost, simplicity and operating range are important and extremely high accuracy is not required. RTD's and thermistors provide a change in resistance that is related to temperature and while to offer higher accuracy than thermocouples the have a more limited operating range. Semiconductor devices provide an output voltage or current proportional to temperature and offer low cost devices with a limited operating range and accuracy comparable to thermocouples. For more information on temperature measurements, refer to the section at the end of the page: Temperature Measurement Sensors - A Brief Overview.
Dedicated Temperature Data Loggers
TandD TR-5x Series |
TandD RTR-5x Series |
TandD TR-71 Series |
| The TR-5x series data loggers are compact, water-resistant, wireless, temperature loggers. Each compact logger can store up to 16,000 data points and connects to a PC through the TR-50C optical reader |
The RTR-5x series data loggers are compact, water-resistant, wireless, temperature loggers. Each compact logger can store up to 16,000 data points and connects to a PC through the RTR-57U Wireless Data Collector, the RTR-5W Wireless Data Collector, or the RTR-50 Wireless USB Base Station/Repeater |
The TR-71 Series data loggers are compact, 2-channel, temperature loggers with a range of -60°C to 155 °C, that can store up to 16,000 data points |
| TR-51A |
Internal Sensor with a range of -40°C to 80°C |
RTR-51 |
Internal Sensor with a range of -40°C to 80°C |
TR-71U |
USB Interface |
| TR-52 |
External Sensor with a range of -60°C to 155°C |
RTR-52 |
External Sensor with a range of -60°C to 155°C |
TR-71W |
Ethernet Interface |
Temperature Data Loggers with Thermocouple Inputs
Grant Squirrel OQ610 |
dataTaker DT1700 Series |
| The OQ610 is a 6-channel type-K, or type-T, thermocouple temperature data logger. The OQ610 can log up to 6 samples/sec and store up to 260,000 data points. When used with a thermal barrier, the OQ610 is ideal for oven-profiling applications. |
The dataTaker DT1700 Series data loggers are 1-, 2-, or 4-channel loggers with Type-J, -K, -T, -E, -R and -S thermocouple support. The dataTaker DT1700 Series data loggers have internal storage for 70,000 data points, a serial interface, and 10-year battery life. |
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DT1700-20N |
1 thermocouple input plus ambient temperature with range of -200°C to 240°C with ±0.35°C accuracy at 25°C |
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DT1700-20W |
1 thermocouple input plus ambient temperature with range of -100°C to 1370°C with ±1.3°C accuracy at 25°C |
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DT1700-40N |
2 thermocouple inputs plus ambient temperature with range of -200°C to 240°C with ±0.35°C accuracy at 25°C |
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DT1700-40W |
2 thermocouple inputs plus ambient temperature with range of -100°C to 1370°C with ±1.3°C accuracy at 25°C |
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DT1700-50N |
4 thermocouple inputs plus ambient temperature with range of -200°C to 240°C with ±0.35°C accuracy at 25°C |
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DT1700-50W |
2 thermocouple inputs plus ambient temperature with range of -100°C to 1370°C with ±1.3°C accuracy at 25°C |
Temperature Data Loggers with RTD Inputs
Infinite Informatics iLOG Series |
TandD TR-81 |
| The iLOG series data loggers are 4-channel data logger that can accommodate. RTD, PT100, 0-1 Volt, 0-20 mA, or 4-20 mA input types. The iLOG series data loggers incorporate an internal web server with FTP and email support which makes it ideal for remote temperature logging applications. |
The TR-81 is a 2-channel precision, temperature data logger, with a range of -200°C to 600 °C, that can store up to 8,000 data points. |
| iLOG-EDM |
Serial port interface for external modems |
| iLOG-GSM |
Built-in GSM/GPRS modem |
| iLOG-LAN |
Ethernet interface for network connectivity |
Temperature Data Loggers with Thermistor Inputs
dataTaker DT1000 |
| The dataTaker DT1000 data logger has an internal sensor for ambient temperurature and a single channel for thermistor input with a range of -50°C to 150°C. |
General Purpose Data Loggers with Universal Inputs
dataTaker DT80 Series |
dataTaker DT800 |
dataTaker DT50 Series |
The DT80 series data loggers have ±30-Volt input range with a built-in display and a USB memory slot for easy data transfer. The DT80 Series are stand-alone data loggers that connect to a PC via Ethernet, USB, or RS-232.
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The DT800 data logger is has 12 to 42 analog input channels, 16 digital channels, and 1 serial sensor channel. The DT800 stores up to 130,000,000 data points and has an ATA Flash card slot for removable data storage. Accepts up to 42 thermocouples, RTD's, thermistors or solidstate measurement devices.
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The DT50 series data loggers have up to 5 low-voltage input channels that are suitable for thermocouple, RTD or thermistor measurements. The DT50 series data loggers also have digital and counter inputs, stores up to 130,000 points in internal memory, and require an RS-232 port for connection to a PC.
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| DT80 |
5 to 15 analog inputs, 12 digital channels, 1 serial sensor channel. Accepts up to 15 thermocouples, 5 thermistors, RTD's or solid state measurement devices. |
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DT50 |
5 to 10 analog inputs, 5 digital channels, 3 counter channels, SRAM PC Card slot for Removable Data Storage. Accepts up to 15 thermocouples, 5 thermistors, RTD's or solid state measurement devices. |
| DT81 |
1 to 3 analog inputs, 4 digital channels, 4 counter channels. Accepts up to 3 thermocouples or 1 RTD, thermistor or solid state measurement devices. |
DT51 |
1 to 3 analog inputs, 4 digital channels, 3 counter channels. Accepts up to 3 thermocouples or 1 RTD, thermistor or solid state measurement devices. |
dataTaker DT500/DT600 Series |
Grant Squirrel SQ2020/SQ2040 Series |
KineticSystems DAQ400/DAQ500 Series |
The DT500/DT600 series data loggers have 10 to 30 analog input channels with 4 digital channels and 3 counter channels. Each store up to 1,390,000 data points and have an SRAM PC card slot for removable data storage. The DT500/600 family can accept up to 30 thermocouples or 10 RTD's, thermistors or solid state measurement device in the base unit. Optional expansion modules provide up to 90 thermocouple inputs or 30 thermistor, RTD or solid state devices.
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The Grant Squirrel SQ2020/SQ2040 series data loggers are capable of sub-second logging and concurrent sampling. With 16 MB of internal memory, the Grant Squirrel SQ2020/SQ2040 series data loggers can log approximately 1,000,000 to 2,000,000 readings that can be downloaded to a removable MMC memory card. Inputs can be used with thermistor, thermocouple and RTD temperature sensors and 4-20mA instruments.
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The portable KineticSystems DAQ400/DAQ500 Series data loggers have 4 to 64 channels that are compatible with most thermocouple types. The KineticSystems DAQ400/DAQ500 Series data loggers can interface to a PC or operate standalone, and stores data on a removable CompactFlash™ card. It supports sample rates of up to 50-kHz aggregate. |
| DT500 |
±2.5 V input Measurement Range |
SQ2020-1F8 |
Up to 16 thermocouple or 8 thermistor inputs with a single ADC |
DAQ432 |
32 input channels with programmable gain and 4 kHz aggregate sample rate. Accepts up to 32 thermocouples |
| DT505 |
±100 V input Measurement Range |
SQ2020-2F8 |
Up to 16 thermocouple, 8 thermistor or 8 RTD inputs with two ADC's |
DAQ464 |
64 input channels with programmable gain and 4 kHz aggregate sample rate. Accepts up to 64 thermocouples. |
| DT600 |
±2.5 V input Measurement Range, with built-in display |
SQ2040-2F16 |
Up to 32 thermocouple or 16 thermistor inputs with two ADC's |
DAQ516 |
16 input channels with fixed gain and 50 kHz aggregate sample rate. Accepts up to 16 thermocouples |
| DT605 |
±100 V input Measurement Range, with built-in display |
SQ2040-4F16 |
Up to 32 thermocouple, 16 thermistor or 16 RTD inputs with two ADC's |
DAQ532 |
32 input channels with fixed gain and 50 kHz aggregate sample rate. Accepts up to 32 thermocouples |
Nimtech FrontDAQ |
Fourier Systems DaqPRO |
The Nimtech FrontDAQ data logger has 20 analog input channels, 20 digital channels and 4 analog outputs. The Nimtech FrontDAQ data logger can sample at 7.7 kHz per channel and store data to CompactFLASH™ memory. The Nimtech FrontDAQ data logger is network-ready and incorporates an internal web server for setting up and viewing data. Accepts up to 20 thermocouples or RTD's.
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The Fourier Systems DaqPRO data logger has 8 input channels that measure voltage, current, thermocouples, and RTD's. The Fourier Systems DaqPRO data logger can log up to 4000 samples / sec and has 512 kB of local memory. The graphical display allows for stand-alone set-up and operation.
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Temperature Measurement Sensors - A Brief Overview
Thermocouples are the most common and one of the least expensive sensors. A thermocouple is nothing more than 2 dissimilar metal wires of very specific alloys that are fused together at a single point. A thermocouple produces an output voltage (typically at the millivolt level) that is related to the temperature. The data logger measures the voltage and then applies a calibration equation to convert the voltage to temperature. The data logger also incorporate a cold junction reference to compensate for any offset voltage that occur at the connections between the thermocouple wires and the data logger. A thermocouple temperature measurement actually involves multiple voltage measurements of the thermocouple an reference junction as well as scaling the voltage to temperature and compensating for the reference temperature. Because of variations in the composition of the thermocouple wire, typical thermocouple accuracies are on the order of 1-2°F although there are special composition wires with reduced errors.
An RTD sensor is a device whose resistance increases linearly with temperature. The most common RTD consists of a fine platinum wire wound around a cylinder but nickel and copper wire is also used in some cases. The resistance vs. temperature curve has a very specific slope and the RTD is made so that it has a specific resistance at 0°C, with 100 Ω being the most common value. To measure temperature, the data logger will source a known current through the RTD and measure the resulting voltage from which it can calculate the resistance. Finally, using the slope of the resistance vs. temperature curve and the 0°C resistance, the data logger can calculate the temperature. RTD's are typically more stable and accurate than thermocouples, but at the expense of a reduced operating range.
Thermistors are similar to RTD's in that they are devices whose resistance changes with temperature but the resistance change is highly non-linear. Because of this characteristic, thermistors can offer very accurate temperature measurements, down to an accuracy of 0.01°C, but only over a very limited temperature range typically -40°C to 150°C. Like RTD's, thermistors are designed to have a specific resistance at 0°C, 2252 Ω is a common value and each family of thermistors have a specific resistance vs temperature characteristic that the data logger must be able to accommodate.
Semiconductor sensors incorporate a solid state device such as a diode or voltage reference that have a well established voltage vs temperature characteristic along with signal processing electronics to generate a voltage or current output that is proportional to temperature. For example, the Analog Devices AD592 transducer provides an output current of 1µA/K with an output of 248 µA at -25°C. These device only require a simple voltage or current measurement and linear calculation to scale the signal to temperature. |
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