Fluke 721Ex Precision Pressure Calibrator

Fluke 721Ex Precision Pressure Calibrator

Fluke 721Ex Precision Pressure Calibrator

Intrinsically Safe Dual-Sensor Pressure Calibration Tool for Gas Flow Applications

Product Description Fluke 721Ex Precision Pressure Calibrator:

The Fluke 721Ex is a highly accurate, intrinsically safe pressure calibrator designed specifically for custody transfer and gas flow applications in hazardous environments. Equipped with dual isolated stainless steel pressure sensors, it offers wide configuration flexibility by combining one low-pressure sensor (16 or 36 psi) with a choice of seven high-pressure ranges up to 5000 psi. Its rugged design, bright multi-line display, and compatibility with RTD temperature probes make it an essential tool for field calibration work.

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Key Features:

• Certified intrinsically safe (IECEx & ATEX: Ex ia IIB T3 Gb, Zone 1)

• Dual isolated pressure sensors with 0.025% FS accuracy (0.035% for 5000 psi)

• Configurable with one of two low-pressure ranges (16 psi or 36 psi) and one of seven high-pressure ranges (up to 5000 psi / 345 bar)

• Ideal for gas flow calibration (custody transfer)

• Optional RTD Pt100 input for temperature measurement

• Pressure switch testing on both inputs

• Supports 19 selectable pressure units

• Large, bright display shows up to 3 measurements simultaneously

• Stores five user-configurable instrument settings

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Pressure Sensor Configurations (Accuracy ±0.025% FS unless noted):

• Low-Pressure Options:

  • 16 psi / 1.1 bar (resolution: 0.001 psi / 0.0001 bar)

  • 36 psi / 2.48 bar (resolution: 0.001 psi / 0.0001 bar)

• High-Pressure Options:

  • 100 psi / 6.9 bar

  • 300 psi / 20 bar

  • 500 psi / 34.5 bar

  • 1000 psi / 69 bar

  • 1500 psi / 103.4 bar

  • 3000 psi / 200 bar

  • 5000 psi / 345 bar (accuracy ±0.035% FS)

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Electrical and Temperature Measurement:

• Current measurement: 0 to 24 mA

  • Resolution: 0.001 mA

  • Accuracy: ±0.015% of reading ±0.002 mA

• RTD input (optional): Pt100 probe support for temperature readings

• Temperature influence: ±0.002% FS/°C outside 15°C to 35°C range

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General Specifications:

• Memory: Stores last settings upon power-on

• Operating temperature: -10°C to +45°C

• Storage temperature: -20°C to +60°C (without batteries)

• Altitude: Up to 2000 meters

• Ingress protection: IP-40

• Battery life: >35 hours (typical use)

• Power: Four AA alkaline batteries (6.0 VDC)

• Weight: 0.539 kg (1 lb 3 oz)

• Dimensions: 20 × 11 × 5.8 cm

• Connections: Dual 1/8 in NPT ports, compatible with 700P Series pressure modules and RTD probes

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Available Pressure Units:

• psi, bar, mbar, kPa, kg/cm²

• cmH₂O & mH₂O at 4°C and 20°C

• inH₂O at 4°C, 20°C, and 60°F

• mmHg & inHg at 0°C

• ftH₂O at 4°C, 20°C, and 60°F

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Safety Certifications:

• ATEX: Ex ia IIB T3 Gb (KEMA 10 ATEX 0168X)

• IECEx: Ex ia IIB T3 Gb (IECEx CSA 10.0013X)

• Temperature rating: -10°C to +45°C

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Summary Fluke 721Ex Precision Pressure Calibrator:

• Overview: Dual-sensor, intrinsically safe pressure calibrator for hazardous gas environments.

• Accuracy: 0.025% FS on both pressure sensors (0.035% on highest range).

• Flexibility: Up to 14 sensor combinations available.

• Display: Bright screen shows 3 readings at once.

• Applications: Ideal for gas custody transfer, switch testing, and field calibration.

• Durability: Certified for rugged use in explosive zones.

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Key Selling Points:

• ATEX & IECEx certified for Zone 1 use

• Dual isolated pressure sensors

• 19 pressure unit options

• RTD and mA measurement support

• Long battery life and field-ready design

• Configurable memory and intuitive interface