Fluke 724 Temperature Calibrator

The Fluke 724 Temperature Calibrator is designed for technicians who need to test and calibrate a wide range of temperature sensors and transmitters in the field.

Unlike a basic thermometer that only measures temperature, the Fluke 724 can both measure and source/simulate temperature signals. It also measures 4–20 mA and can provide 24 V loop power, allowing temperature sensors and transmitters to be tested with a single instrument.

Measure and Source Multiple Temperature Signals

The Fluke 724 supports a broad range of RTD and thermocouple inputs and outputs.

Supported RTDs include:

• 
  NI-120
  
• 
  Pt100 (385)
  
• 
  Pt100 (393)
  
• 
  Pt100 JIS
  
• 
  Pt200 (385)
  
• 
  Pt500 (385)
  
• 
  Pt1000 (385)
  

Supported thermocouples include:

• 
  J
  
• 
  K
  
• 
  T
  
• 
  E
  
• 
  R
  
• 
  S
  
• 
  B
  
• 
  L
  
• 
  U
  
• 
  N
  

It also supports XK and BP thermocouple types according to the current specification.

This makes the 724 suitable for calibration of many common industrial temperature instruments without requiring separate calibrators for each sensor technology.

4–20 mA Measurement and 24 V Loop Power

A major advantage of the Fluke 724 for process instrumentation work is its integrated mA measurement and loop power capability.

The calibrator can:

• 
  Measure up to 24.000 mA
  
• 
  Measure current with 0.02% + 2 counts accuracy
  
• 
  Provide 24 V loop power
  
• 
  Supply up to 22 mA
  
• 
  Perform simultaneous temperature source and mA measurement
  

This allows technicians to power a temperature transmitter while sourcing a simulated RTD or thermocouple signal and observing the transmitter's current output.

Dual-Line Measure/Source Display

The dual-line display allows the technician to see the source value and measured process signal simultaneously.

For example, when testing a temperature transmitter, the 724 can source a simulated temperature on the lower display while showing the transmitter's 4–20 mA output on the upper display.

This makes transmitter calibration and troubleshooting considerably easier because the input and output can be monitored at the same time.

Fast Temperature Transmitter Testing

The Fluke 724 provides 25% and 100% step functions, as well as slow ramp, fast ramp, auto-step and auto-ramp functions.

These functions are useful for checking transmitter linearity and response across the measurement range.

For example, a technician can step a simulated temperature transmitter input through:

0% → 25% → 50% → 75% → 100%

and observe the corresponding 4–20 mA output.

This provides a faster way to identify calibration errors, non-linearity or abnormal transmitter response.

High-Speed Pulsed RTD Circuit Testing

The Fluke 724 is also capable of handling high-speed pulsed RTD circuits, making it suitable for testing temperature transmitters and PLC-related instrumentation that use pulsed excitation or measurement techniques.

Measure and Source Voltage and Resistance

In addition to temperature signals, the 724 can measure and source:

• 
  DC voltage
  
• 
  Millivolt signals
  
• 
  Resistance
  
• 
  Temperature
  
• 
  4–20 mA current
  

Important ranges include:

• 
  DC voltage measurement up to 30 V
  
• 
  DC voltage source up to 10 V
  
• 
  Millivolt measurement/source through the TC connector
  
• 
  Resistance measurement/source up to 3200 Ω
  
• 
  Current measurement up to 24 mA
  

This additional functionality makes the 724 useful for troubleshooting related process instrumentation beyond temperature sensors alone.

Key Specifications

• 
  Product type: Temperature calibrator
  
• 
  RTD types: 7 common RTD types
  
• 
  Thermocouple types: J, K, T, E, R, S, B, L, U, N, plus XK/BP
  
• 
  Temperature resolution: 0.1 °C for most RTD/TC ranges
  
• 
  mA measurement: 0–24 mA
  
• 
  mA accuracy: 0.02% + 2 counts
  
• 
  24 V loop power: Yes
  
• 
  Maximum loop current: 22 mA
  
• 
  DC voltage measurement: Up to 30 V
  
• 
  Resistance measurement: Up to 3200 Ω
  
• 
  Source functions: Temperature, voltage, current, resistance, frequency
  
• 
  Ramp: Slow, fast and 25% step-ramp
  
• 
  Step: 25% and 100%
  
• 
  Operating temperature: -10 to +55 °C
  
• 
  Battery: 4 × AA alkaline
  
• 
  Typical battery life: 25 hours
  
• 
  Dimensions: 96 × 200 × 47 mm
  
• 
  Weight: 650 g
  
• 
  Warranty: 3 years
  

Typical Applications

Temperature Transmitter Calibration

Simulate an RTD or thermocouple input and simultaneously measure the transmitter's 4–20 mA output.

RTD Testing

Measure or simulate Pt100, Pt200, Pt500 and Pt1000 sensors for calibration and troubleshooting.

Thermocouple Calibration

Source and measure common J, K, T, E, R, S, B, L, U and N thermocouple signals.

4–20 mA Loop Testing

Power temperature transmitters with the integrated 24 V loop supply while monitoring their current output.

PLC and Process Instrument Testing

Use voltage, resistance, current and temperature source functions to troubleshoot process control instrumentation.

Linearity and Response Testing

Use automatic step and ramp functions to verify transmitter response throughout its operating range.

Fluke 724 vs Fluke 1524

These two products should not be positioned as competing products on your website.

• 
  Fluke 724: Temperature calibrator — measures and sources/simulates temperature signals.
  
• 
  Fluke 1524: Precision temperature readout — primarily measures temperature from external reference sensors.
  
• 
  724: Designed for field calibration of temperature transmitters and sensors.
  
• 
  1524: Designed for high-accuracy reference temperature measurement and calibration laboratory applications.
  
• 
  724: Includes 4–20 mA measurement and 24 V loop power.
  
• 
  1524: Focuses on precision PRT/RTD/thermocouple measurement and data logging.

FAQ

What is the Fluke 724 used for?

The Fluke 724 is used to test and calibrate RTDs, thermocouples, temperature transmitters and related process instrumentation.

Can the Fluke 724 calibrate Pt100 sensors?

Yes. It supports Pt100 in multiple curves, including Pt100 (385), Pt100 (393) and Pt100 JIS.

Can the Fluke 724 simulate thermocouples?

Yes. It can source/simulate multiple thermocouple types, including J, K, T, E, R, S, B, L, U and N.

Does the Fluke 724 provide 24 V loop power?

Yes. The integrated loop-power function provides 24 V for powering process transmitters during testing.

Can the Fluke 724 measure 4–20 mA?

Yes. It measures up to 24 mA and can simultaneously source a temperature signal while monitoring the transmitter's current output.

Is the Fluke 724 a multifunction process calibrator?

It is primarily a temperature calibrator, but it also supports mA, voltage and resistance measurement/source functions. For applications requiring pressure calibration as well, the Fluke 725 is the broader multifunction option.