The Fluke 725Ex is an intrinsically safe multifunction process calibrator designed for measuring, sourcing and simulating electrical and process signals in potentially explosive atmospheres.
Combining multiple calibration functions in a compact handheld instrument, the Fluke 725Ex provides a versatile solution for testing and calibrating industrial transmitters, sensors, temperature measurement systems and process instrumentation.
The instrument measures and sources DC voltage, DC current, resistance, frequency, thermocouples and resistance temperature detectors. With compatible intrinsically safe pressure modules, it can also measure pressure.
Its intrinsically safe design makes the Fluke 725Ex particularly suitable for maintenance and calibration applications in the chemical, petrochemical, oil and gas, pharmaceutical and process industries.
The integrated dual display allows technicians to monitor input and output signals simultaneously, simplifying transmitter calibration and troubleshooting.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
The Fluke 725Ex combines comprehensive process calibration functions with intrinsically safe operation.
Its main advantages include:
- Intrinsically safe multifunction process calibrator
- Suitable for approved hazardous-area applications
- Measures DC voltage up to 30 V
- Measures and sources DC current up to 24 mA
- Sources DC voltage up to 10 V
- Measures and simulates resistance
- Measures and simulates RTD signals
- Measures and simulates thermocouple signals
- Measures and generates frequency signals
- Pressure measurement with compatible intrinsically safe pressure modules
- Simultaneous measurement and source functions
- Integrated dual display
- Automatic and manual stepping
- Automatic ramp functions
- Integrated 12 V loop power supply
- Compact handheld construction
- Battery-powered operation
- Suitable for industrial field calibration
- Ideal for transmitter testing and maintenance
- Professional calibration support from europascal
Intrinsically Safe Calibration in Hazardous Areas
The Fluke 725Ex is designed for calibration applications in potentially explosive atmospheres.
Its intrinsically safe construction helps prevent ignition hazards when the instrument is used within the limits of its certification.
The manufacturer specifies the following approvals:
ATEX II 1 G Ex ia IIB 171 °C
KEMA 04ATEX 1303X
The instrument also meets specified North American intrinsic safety requirements.
These approvals make the Fluke 725Ex suitable for certain hazardous-area applications in industrial facilities.
Typical environments include chemical production plants, petrochemical facilities, refineries and industrial process installations.
The instrument must always be used in accordance with its applicable certification, operating instructions and hazardous-area restrictions.
Only approved accessories and compatible intrinsically safe pressure modules may be used in hazardous areas.
Multifunction Process Calibration
The Fluke 725Ex combines several measurement and simulation functions in one portable instrument.
This reduces the number of individual calibration devices required during field maintenance.
The calibrator can measure and source electrical signals used by industrial sensors and transmitters.
Typical calibration tasks include:
- Temperature transmitter calibration
- Pressure transmitter calibration
- Current loop verification
- RTD simulation
- Thermocouple simulation
- Voltage signal simulation
- Resistance measurement
- Frequency measurement
- Process instrument troubleshooting
The multifunction design is particularly useful for maintenance technicians who need to perform different calibration tasks at the same installation site.
DC Voltage Measurement and Simulation
The Fluke 725Ex supports DC voltage measurement and generation.
The manufacturer specifies a DC voltage measurement range of up to:
30 V DC
The instrument can generate DC voltage signals up to:
10 V DC
For the specified DC voltage functions, the basic accuracy is:
±(0.02% of reading + 2 counts)
This allows technicians to test voltage inputs and outputs of industrial process instrumentation.
Typical applications include checking transmitters, controllers and measurement systems.
The maximum permissible terminal voltage and hazardous-area restrictions must always be observed.
DC Current Measurement and Generation
The Fluke 725Ex supports DC current measurement and generation.
The current range extends from:
0 mA to 24 mA
The manufacturer specifies an accuracy of:
±(0.02% of reading + 2 counts)
The current resolution is:
0.001 mA
This makes the instrument particularly suitable for testing industrial current loops.
The standard current signal used in many industrial applications is:
4–20 mA
The Fluke 725Ex can generate current signals to simulate a transmitter output.
It can also measure current signals generated by connected process instruments.
This allows technicians to verify transmitter performance and investigate signal deviations.
Integrated 12 V Loop Power Supply
The Fluke 725Ex includes an integrated loop power supply.
The manufacturer specifies:
12 V DC
This function allows compatible transmitters to be powered during calibration.
The loop supply can be used together with current measurement functions.
The maximum specified loop supply current is:
22 mA
The loop supply is short-circuit protected.
Unlike some other multifunction process calibrators, the Fluke 725Ex provides a 12 V loop supply rather than a 24 V loop supply.
This distinction is important when calibrating transmitters with higher minimum operating voltage requirements.
RTD Measurement and Simulation
The Fluke 725Ex supports measurement and simulation of resistance temperature detectors.
Supported RTD characteristics include:
- Pt100 with α = 0.00385
- Pt100 with α = 0.003926
- Pt100 with α = 0.003916
- Pt200 with α = 0.00385
- Pt500 with α = 0.00385
- Pt1000 with α = 0.00385
- Ni120
The instrument supports temperature measurement and simulation using the corresponding resistance characteristics.
For a Pt100 sensor with α = 0.00385, the manufacturer specifies a temperature range of:
−200 °C to +800 °C
The specified accuracy is:
±0.33 °C
This allows technicians to check RTD transmitters without requiring a physical temperature source.
The calibrator simulates the electrical resistance corresponding to a selected temperature.
The connected transmitter interprets this resistance as a temperature signal.
The transmitter output can then be compared with the expected value.
Thermocouple Measurement and Simulation
The Fluke 725Ex supports measurement and simulation of different thermocouple types.
Supported thermocouple types include:
- Type J
- Type K
- Type T
- Type E
- Type R
- Type S
- Type B
- Type L
- Type U
- Type N
Depending on the instrument version and applicable specifications, additional thermocouple characteristics may be supported.
The instrument includes automatic reference junction compensation.
This is important for accurate thermocouple measurement and simulation.
The Fluke 725Ex can generate the thermoelectric voltage corresponding to a selected thermocouple temperature.
This allows temperature transmitters and measurement instruments to be calibrated without using a temperature furnace or dry block.
For Type K thermocouples, the specified measurement and simulation range extends from:
−200 °C to +1370 °C
The accuracy depends on the selected thermocouple type and temperature range.
Resistance Measurement and Simulation
The Fluke 725Ex supports resistance measurement and simulation.
The resistance measurement range extends up to:
3200 Ω
This function is useful for testing resistance-based measurement systems.
Resistance simulation allows technicians to generate defined resistance values.
These values can be used to check transmitters, controllers and measurement instruments.
For demanding applications, the applicable resistance range, measurement configuration and accuracy specification must be considered.
Frequency Measurement and Generation
The Fluke 725Ex supports frequency measurement and generation.
The instrument provides frequency functions covering ranges up to:
10 kHz
This makes it suitable for checking compatible frequency-based process instrumentation.
Typical applications include:
- Frequency transmitter testing
- Pulse signal verification
- Process indicator testing
- Industrial signal simulation
- Frequency input calibration
The frequency output can be used to simulate compatible process signals.
The manufacturer specifies a square-wave output for frequency generation.
Pressure Measurement with External Modules
The Fluke 725Ex supports pressure measurement using compatible intrinsically safe pressure modules.
The manufacturer specifies compatibility with selected modules from the:
Fluke 700PEx series
These modules allow pressure measurement in approved hazardous-area applications.
Depending on the selected module, pressure measurements may include:
- Gauge pressure
- Absolute pressure
- Differential pressure
- Vacuum
- High pressure
The achievable pressure range and accuracy depend on the connected module.
The manufacturer specifies pressure accuracy starting from:
0.025% of range
The Fluke 725Ex does not contain an integrated pressure generator.
An external pressure source is required to apply pressure to the connected pressure module and device under test.
Only pressure modules approved for the intended hazardous-area application should be used.
Dual Display for Simultaneous Measurement
The Fluke 725Ex features a dual display.
The upper display is used for selected measurement functions.
The lower display supports measurement and source functions.
This arrangement allows technicians to monitor input and output signals simultaneously.
For example, the instrument can simulate a temperature sensor while measuring the corresponding transmitter current.
This simplifies calibration procedures and reduces the need for additional measurement instruments.
The dual display is particularly useful when checking the complete signal conversion of industrial transmitters.
Automatic Step and Ramp Functions
The Fluke 725Ex includes automatic and manual stepping functions.
The instrument supports:
- Manual stepping
- Automatic stepping
- Slow ramp
- Fast ramp
- 25% step ramp
These functions simplify calibration procedures involving several measurement points.
For example, a 4–20 mA transmitter can be checked at several defined percentages of its measuring range.
Typical test points include:
| Percentage | Current |
|---|---|
| 0% | 4 mA |
| 25% | 8 mA |
| 50% | 12 mA |
| 75% | 16 mA |
| 100% | 20 mA |
Automatic stepping reduces manual adjustments and helps improve calibration efficiency.
The ramp function is useful for observing transmitter response and detecting switching or control behavior.
Calibration of Temperature Transmitters
The Fluke 725Ex is particularly suitable for temperature transmitter calibration.
Temperature transmitters convert sensor signals into standardized electrical output signals.
The calibrator can simulate RTD or thermocouple signals while measuring the transmitter output.
This allows technicians to verify the conversion between the simulated temperature and the transmitter output signal.
For example, a temperature transmitter with a measuring range from 0 °C to 100 °C and an output of 4–20 mA can be tested at several temperature points.
The Fluke 725Ex simulates the corresponding sensor signal.
The transmitter output is then measured and compared with the expected current.
This allows linearity errors, zero-point deviations and span errors to be identified.
Calibration of Pressure Transmitters
The Fluke 725Ex can also be used for pressure transmitter calibration.
A compatible intrinsically safe pressure module measures the applied pressure.
The calibrator simultaneously measures the transmitter output signal.
This allows the relationship between pressure and electrical output to be verified.
An external pressure source is required to generate the test pressure.
The pressure module must be selected according to the required pressure range, accuracy and hazardous-area approval.
Compact and Portable Design
The Fluke 725Ex is designed for mobile calibration applications.
Its compact construction makes it suitable for transportation between different measurement locations.
The instrument operates using four AA alkaline batteries.
This eliminates the need for an external power supply during normal operation.
Battery-powered operation is particularly useful when working in industrial facilities where convenient power outlets may not be available.
The instrument is designed for demanding field conditions.
Technical Highlights
| Specification | Fluke 725Ex |
|---|---|
| Manufacturer | Fluke |
| Model | 725Ex |
| Product type | Intrinsically Safe Multifunction Process Calibrator |
| DC voltage measurement | Up to 30 V |
| DC voltage generation | Up to 10 V |
| DC current measurement | 0–24 mA |
| DC current generation | 0–24 mA |
| DC current resolution | 0.001 mA |
| Basic DC voltage accuracy | ±(0.02% of reading + 2 counts) |
| Basic DC current accuracy | ±(0.02% of reading + 2 counts) |
| Resistance measurement | Up to 3200 Ω |
| Frequency measurement | Up to 10 kHz |
| Frequency generation | Up to 10 kHz |
| RTD measurement | Yes |
| RTD simulation | Yes |
| Thermocouple measurement | Yes |
| Thermocouple simulation | Yes |
| Pressure measurement | With compatible 700PEx modules |
| Integrated pressure generation | No |
| Loop power supply | 12 V DC |
| Maximum loop supply current | 22 mA |
| Automatic stepping | Yes |
| Automatic ramping | Yes |
| Display | Dual display |
| Power supply | 4 AA alkaline batteries |
| Operating temperature | −10 °C to +55 °C |
| Intrinsic safety | ATEX and other specified approvals |
| Typical applications | Transmitter calibration, process instrumentation, hazardous-area maintenance |
Calibration Service by europascal
Regular calibration is essential for maintaining reliable and traceable measurements.
europascal provides professional calibration services for electrical and process measurement equipment.
When the Fluke 725Ex is used as a calibration standard, its measurement and source functions should be checked at appropriate intervals.
Relevant calibration functions include:
- DC voltage measurement
- DC voltage generation
- DC current measurement
- DC current generation
- Resistance measurement
- Resistance simulation
- Frequency measurement
- Frequency generation
- RTD simulation
- Thermocouple simulation
The measurement uncertainty must be evaluated according to the applicable calibration procedure.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Why Choose the Fluke 725Ex?
The Fluke 725Ex combines comprehensive process calibration functions with intrinsically safe operation.
Its multifunction design allows technicians to measure, generate and simulate numerous industrial signals using one handheld instrument.
The instrument is particularly suitable for maintenance and calibration work in approved hazardous areas.
DC voltage, DC current, resistance, frequency, RTD and thermocouple functions cover many common industrial calibration requirements.
With compatible intrinsically safe pressure modules, the instrument can also measure pressure.
The integrated dual display simplifies transmitter calibration by allowing input and output signals to be monitored simultaneously.
Automatic stepping and ramp functions help reduce manual adjustments during calibration procedures.
The integrated 12 V loop power supply provides additional flexibility when testing compatible transmitters.
For industrial maintenance technicians, calibration laboratories and process instrumentation specialists, the Fluke 725Ex provides a versatile solution for field calibration and troubleshooting.
europascal supports customers with professional calibration equipment, technical advice and calibration services.
Typical Applications for the Fluke 725Ex
The Fluke 725Ex is suitable for numerous industrial calibration applications.
Typical applications include:
- Intrinsically safe process calibration
- Hazardous-area maintenance
- Temperature transmitter calibration
- Pressure transmitter calibration
- RTD simulation
- Thermocouple simulation
- 4–20 mA loop calibration
- DC voltage calibration
- DC current calibration
- Resistance measurement
- Frequency measurement
- Industrial process instrumentation
- Chemical production
- Petrochemical facilities
- Oil and gas installations
- Pharmaceutical manufacturing
- Preventive maintenance
- Commissioning
- Industrial troubleshooting
- Calibration laboratories
- Process quality assurance
The combination of intrinsically safe construction, comprehensive measurement functions and portable operation makes the Fluke 725Ex a professional solution for demanding industrial calibration applications.
Find more Fluke Calibration products here.
Manufacturer information for the Fluke 725Ex can be found on the official Fluke website.
