LFI3751 5 A Digital Temperature Control Instrument

  • Drive ±5 A of TEC or RH current
  • 9.5V Compliance Voltage
  • Digital PID Improves Stability for RTDs
  • Addressable RS-232 or USB
  • Supports Thermistors, RTDs, IC sensors
  • Free LabVIEW drivers
  • Linear Stability: 0.001°C
  • PID Autotune
  • Autoranging sensor bias currents
  • Heat and cool current limits
  • High and low temperature limits

From: $2,399.00

Bulk Pricing (6 - 14): $2351.00

Contact Factory for High Volume Pricing
Price adjustments will be reflected in the cart. For availability information please contact us. All prices are in US dollars and are subject to change without notice. Prices do not include shipping charges. An additional OEM discount applies on orders over 14 pieces. Contact factory for pricing. If ordering from or shipping to Australia, China, Hong Kong or Israel please contact your distributor.

The high-performance LFI3751 with Autotune PID temperature control instrument is now CE-compliant. Drive up to ±5 A to either thermoelectrics (TECs) or resistive heaters (RH) with up to 9.5 V compliance. This instrument operates from AC (115 / 230, 50 or 60Hz). Expect stability as good as 0.001°C with thermistors. Even across ambient, this PID controller maintains precision temperature.

From the front panel, adjust temperature limits, current limits, setpoint, PID control values, sensor calibration data, and enable or disable output current. The 4-digit display shows actual or setpoint temperature or resistance, output current and voltage.

This instrument offers unique features. Autotune PID is a sophisticated algorithm for optimizing the PID control parameters to your load. With the touch of a button, the LFI3751 automatically optimises control settings for most thermal loads, reducing overshoot or improving temperature stability. Autoranging sensor bias currents keep your sensor voltage in the optimal range for maximum signal to noise ratio. It comes with Addressable RS232 and USB control is available with an adapter cable: WCB404. Free LabVIEW drivers simplify computer control. Benchlink software simulates the front panel control from your PC. (NOTE: The Benchlink Installer is not compatible with 64-bit operating systems. A workaround for Benchlink install is available. Contact Tech Support for details if your application uses the Windows 64-bit OS and Benchlink front panel emulation control.)

Sensor calibration is easy with a reference right on the front panel. For example, to calibrate your thermistor, simply enter three data points from the Resistance vs. Temperature curve. The LFI3751 calculates the Steinhart-Hart coefficients and displays either actual temperature or sensor resistance. Also, view Thermoelectric current and voltage and limit current settings.

The LFI3751 Digital option provides better setpoint resolution and stability with low-resolution sensors such as RTDs. This option also offers improved overshoot suppression, 50% faster settling times, and faster calibration. An Analog control model is available: LFI3751 Analog

When controlling laser diode temperature, the LDMOUNT-5A, a 14-pin butterfly laser diode mount with integrated heat sinking, is available for simple connections between the LFI3751 and the laser.

Wavelength also offers temperature control instruments with higher current and voltage capacity TC10 LAB (10A, 15V), or TC15 LAB (15A, 20V), a touchscreen interface, IntelliTune PID control optimization, and better stability.

Free, effective, and responsive technical support is available to simplify integration of Wavelength products into your OEM design. The standard product can be easily modified to meet your application requirements.

Power Supply: 115 / 230 VAC 60 / 50 Hz
Temperature Control Output Current: up to ±5 A
Temperature Stability: 0.001°C (10 kΩ thermistor at 25°C) over one hour
Stability across ambient: 0.001°C (10 kΩ thermistor at 25°C) over an hour – Ideal for scanning applications

Setpoint Resolution: 12 bit D to A

-Digital version provides better set point resolution and stability with low resolution sensors such as RTDs
-Digital version also offers improved overshoot suppression, 50% faster settling times, and faster calibration.
-High and Low Temperature Limits
-Heat and Cool Current Limits
-Digital PID controller with Autotune minimizes overshoot and time to temperature
-RS232 or USB interface
-Free Labview drivers or Benchlink software
-Easy sensor calibration
-Compatible with multiple sensors – especially for low resolution RTDs
-Autoranging sensor bias current optimizes sensor feedback voltage
-Can operate with unipolar current for Resistive Heaters

Front Panel of LFI3751 Temperature Controller















Rear Panel of LFI3751 Temperature Controller (note Analog Input is only available on the LFI3751 Analog)



Related FAQs

FAQ1007: What limits the temperature control range of a temperature controller?
FAQ1009: Why won't my temperature controller settle my load to temperature?
FAQ1010: Why does it take so long to settle to the setpoint temperature?
FAQ1011: Why won't my load stabilize to your temperature controller specification?
FAQ1012: Why is my load heating when it should be cooling?
FAQ1014: What DC power supplies do you recommend to achieve the stability specifications listed in your manuals?
FAQ1015: Should I use a switching power supply for my application?
FAQ1016: How do I view and print your manuals on-line?
FAQ1017: An empty screen appears when I try opening a PDF manual. What does this mean?
FAQ1019: Which address do I use to remit payment or a purchase order?
FAQ1022: Where do I send my unit for repair or calibration?
FAQ1040: What is the latest firmware version of the LFI3751?
FAQ1041: How do I tell what version of firmware my LFI3751 has in it?
FAQ1042: Where can I get the BenchLink software for the LFI3751?
FAQ1043: How often does the sensor circuitry update on the analog LFI3751?
FAQ1044: How often does the control circuitry update on the analog LFI3751?
FAQ1056: What is the display accuracy of the LFI3751?
FAQ1085: Do the temperature controllers always provide full current to the driven element (a TEC or Peltier device, or resistive heater) when the actual temperature does not equal the set point temperature?
FAQ1089: Using the LFI3751, we fail to get any output voltage. On start-up its temperature display is flashing although no other LED is flashing simultaneously (none of the four red error LEDs). While flashing it appears to show the temperature correctly. When we try to enable the output, the instrument gives a long tone, but fails to reset and to output a voltage.
FAQ1115: I would like to run the Benchlink software on a 64-bit Windows OS, but it won't install
FAQ1117: The temperature of my resistive heater is slow to stabilize and is not within specification.
FAQ1120: What does the Compliance Voltage specification in temperature controllers mean?
FAQ1153: What effect does the D term have on system response?
FAQ1158: What software can I use for mechanical downloads?
FAQ1161: What are some important parameters to consider before purchasing a product?
FAQ1163: How does grounding the thermoelectric cooler cable on temperature controllers affect the noise level?
FAQ1171: How do I connect multiple drivers or controllers to a single power supply?


WCB401WCB401 RS-232 cable, 6-ft, DB 25-9 pin$50
WCB402WCB402 RS-232 cable, 6-ft, DB 25-25 pin$50
WCB403WCB403 RS-232 cable, 2-ft, DB 25-25 pin$29
WCB404WCB404 USB-RS232 Adapter Cable$119
LDMOUNT-5ALDMOUNT 5A Butterfly Laser Diode Mount$599
WCB316WCB316 LDMOUNT Cable for the LFI3751$98
WCB103WCB103 LFI3751 Output Cable$105

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