Fluke 721 Pressure Calibration Instruments

$1,800.00

Precision Pressure Calibration · Dual Pressure Sensors · Custody Transfer Applications

Fluke 721 Precision Pressure Calibrator is designed for high-accuracy pressure calibration in gas flow and custody transfer applications. With dual isolated pressure sensors, 4-20 mA measurement, built-in 24 V loop power, and optional temperature measurement, it allows technicians to verify differential pressure, static pressure, and transmitter performance with one portable instrument.

Dual Pressure Measurement · 0.025% Accuracy · 4-20 mA Loop Test · Pt100 RTD Input

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Precision Calibration Tool for Gas Flow and Custody Transfer Systems

The Fluke 721 Precision Pressure Calibrator is developed for engineers and technicians working with gas flow measurement systems, custody transfer applications, and high-accuracy pressure instrumentation.

In gas measurement systems, accurate flow calculation depends on multiple parameters, including differential pressure, static pressure, and temperature. Traditionally, technicians may need several instruments to verify these measurements. The Fluke 721 combines pressure measurement, electrical signal testing, and temperature input capability into a single handheld calibrator, helping simplify field calibration tasks.

Dual Isolated Pressure Sensors for Simultaneous Measurement

One of the key advantages of the Fluke 721 is its dual isolated pressure sensor design.

Unlike standard single-pressure calibrators, the Fluke 721 can measure:


  • Differential pressure (DP)

  • Static line pressure

  • Low pressure signals

  • High pressure signals

simultaneously with one instrument.

This makes it especially suitable for:


  • Gas flow computers

  • Orifice plate measurement systems

  • Differential pressure transmitters

  • Pipeline measurement applications

The calibrator can be configured with different low-pressure and high-pressure ranges to match various application requirements.

Designed for Custody Transfer Gas Measurement

Custody transfer applications require highly accurate measurement because even small errors can affect product volume calculations and commercial transactions.

The Fluke 721 provides:


  • Two stainless steel isolated pressure sensors

  • Up to 0.025% accuracy

  • Multiple pressure range options

  • Stable measurement performance

It is commonly used for calibration of:


  • Gas flow transmitters

  • DP flow meters

  • Flow computers

  • Pressure-based measurement systems

Integrated 4-20 mA Loop Testing

Modern industrial transmitters typically use 4-20 mA signals to communicate measurement values to control systems.

The Fluke 721 allows technicians to verify transmitter electrical output by providing:


  • 4-20 mA measurement

  • DC voltage measurement

  • 24 V loop power supply

This enables direct testing of:


  • Pressure transmitters

  • Differential pressure transmitters

  • Flow transmitters

  • Other loop-powered instruments

without requiring additional power equipment.

Temperature Measurement Capability

Temperature compensation is important in gas flow measurement applications.

The Fluke 721 supports optional Pt100 RTD temperature measurement, allowing technicians to check temperature signals together with pressure measurements.

This makes it possible to evaluate multiple inputs needed for accurate gas flow calibration.

Large Display for Multi-Parameter Calibration

During calibration, engineers often need to compare several measurement values at the same time.

The Fluke 721 features a large backlit graphic display that can show up to three inputs simultaneously, allowing technicians to monitor:


  • Pressure values

  • Electrical signals

  • Temperature measurements

This improves efficiency during complex field calibration procedures.

Expand Pressure Range with Pressure Modules

For applications requiring additional pressure ranges, the Fluke 721 can be connected with compatible Fluke pressure modules.

Using external pressure modules allows technicians to extend measurement capability for different pressure applications without purchasing multiple dedicated calibrators.

Portable Design for Field Calibration

Although designed for precision measurement, the Fluke 721 maintains a compact handheld format suitable for field work.

Key advantages include:


  • Battery-powered operation

  • Rugged handheld construction

  • Backlit display

  • Stored calibration setups

  • Portable pressure testing capability

It is suitable for technicians performing calibration directly at pipelines, measurement stations, and industrial facilities.

Typical Applications

Gas Flow Measurement Calibration

Used for verifying:


  • Gas flow computers

  • DP flow measurement systems

  • Orifice plate applications

  • Custody transfer measurement systems

Differential Pressure Transmitter Calibration

Suitable for:


  • DP transmitters

  • Flow transmitters

  • Level measurement systems

Industrial Pressure Instrument Maintenance

Common applications include:


  • Oil & gas facilities

  • Pipeline measurement stations

  • Energy industries

  • Process plants

FAQ

What is the Fluke 721 Pressure Calibrator used for?

The Fluke 721 is a precision pressure calibrator designed mainly for gas flow calibration and custody transfer applications. It combines pressure measurement, electrical signal testing, and temperature measurement capability in one instrument.

What makes Fluke 721 different from a normal pressure calibrator?

The main difference is its dual isolated pressure sensor design. It can measure static and differential pressure simultaneously, which is especially valuable for gas flow measurement systems.

Can Fluke 721 calibrate differential pressure transmitters?

Yes. The dual pressure sensor configuration makes it suitable for testing and calibrating differential pressure transmitters used in flow and process applications.

Does Fluke 721 provide loop power?

Yes. The Fluke 721 includes an internal 24 V loop power supply for powering transmitters during calibration and testing.

Can Fluke 721 measure temperature?

Yes. With an optional Pt100 RTD probe, the Fluke 721 can measure temperature for applications requiring pressure and temperature verification.

What is the difference between Fluke 721 and Fluke 729 Pro?

The two products target different calibration needs:


  • Fluke 721: Precision pressure measurement for custody transfer and gas flow calibration, using external pressure generation equipment.

  • Fluke 729 Pro: Automatic pressure calibrator with built-in electric pump for faster field pressure generation and transmitter calibration.

Is Fluke 721 suitable for oil and gas applications?

Yes. Its dual pressure measurement capability and high accuracy make it particularly suitable for oil & gas measurement systems, especially custody transfer and gas flow calibration applications.

Pressure Specifications (1-Year)

Model Sensor Range Resolution Accuracy
Fluke-721-1615 Low pressure sensor -14 psi to +16 psi
(-0.97 bar to 1.1 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +1500 psi
(0.00 bar to 103.4 bar)		 0.1 psi
(0.001 bar)		 0.025% of FS
Fluke-721-1630 Low pressure sensor -14 psi to +16 psi
(-0.97 bar to 1.1 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +3000 psi
(0.00 bar to 200 bar)		 0.1 psi
(0.01 bar)		 0.025% of FS
Fluke-721-1650 Low pressure sensor -14 psi to +16 psi
(-0.97 bar to 1.1 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +5000 psi
(0.00 bar to 345 bar)		 0.1 psi
(0.01 bar)		 0.035% of FS
Fluke-721-3615 Low pressure sensor -14 psi to +36 psi
(-0.97 bar to 2.48 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +1500 psi
(0.00 bar to 103.4 bar)		 0.1 psi
(0.01 bar)		 0.025% of FS
Fluke-721-3630 Low pressure sensor -14 psi to +36 psi
(-0.97 bar to 2.48 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +3000 psi
(0.00 bar to 200 bar)		 0.1 psi
(0.01 bar)		 0.025% of FS
Fluke-721-3650 Low pressure sensor -14 psi to +36 psi
(-0.97 bar to 2.48 bar)		 0.001 psi
(0.0001 bar)		 0.025% of FS
High pressure sensor 0 psi to +5000 psi
(0.00 bar to 345 bar)		 0.1 psi
(0.01 bar)		 0.035% of FS

Electrical and Temperature Measurement (1-Year)

Function Range Resolution Accuracy
mA measure 0 to 24 mA 0.001 mA ±0.015% of rdg ±0.002 mA
V DC measure 0 to 30 V DC 0.001 V ±0.015% of rdg ±0.002 V
Temperature measure
(RTD / Ohms)1 		-40 °C to 150 °C
(-40 °F to 302 °F)		 0.01 °C, 0.01 °F ±0.015% of rdg ±0.02 Ω
±0.1 °C (±0.2 °F)
±0.25 °C (±0.45 °F) combined uncertainty with 720 RTD probe
Loop power supply 24 V N/A 24 mA @ 24 V

1. Temperature measurement requires optional Fluke-720RTD Pt-100 RTD probe available as an accessory.

Operational Characteristics

Temperature effect No effect on accuracy on all functions from 15 °C to 35 °C.
Add ±0.002% FS/°C for temperatures outside of 15 °C to 35 °C.
Available pressure units psi, bar, mbar, kPa, kgcm2, cmH2O @ 4°C, cmH2O @ 20°C, mH2O @ 4°C, mH2O @ 20°C, inH2O @ 4°C, inH2O @ 20°C, inH2O @ 60°F, mmHg @ 0°C, inHg @ 0°C, ftH2O @ 4°C, ftH2O @ 20°C, ftH2O @ 60°F
Instrument setup recall Last used on power-up

General & Environmental Specifications

Operating temperature -10 °C to +50 °C
Storage temperature (without batteries) -20 °C to +60 °C
Altitude 2,000 m
Ingress protection IP-40
Power requirements 6.0 V DC
Battery life & type >35 hours typical usage; (4) Standard AA cells
Dimensions (H x W x D) 7.9 x 4.3 x 2.3 in (20 x 11 x 5.8 cm)
Weight 0.3539 kg (1 lb 3 oz)
Connectors / ports pressure Two 1/8 in NPT; 700P Series Pressure Module; RTD Probe

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