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Fluke
Fluke 721 Dual Range Pressure Calibrator
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Dual-sensor pressure calibrator. 0.025% FS; mA/V; optional RTD. RFQ + selection help.
Download datasheet PDF
RFQ cart holds BOM lines only. Submit for engineering quote.
Key parameters
Sensor Configuration
Dual isolated stainless-steel sensors: low 16 or 36 psig + high 100…5000 psi options
Pressure Accuracy
0.025 % of full scale (typical high/low sensors; 0.035 % FS on 5000 psi)
Application
Gas custody transfer / gas flow calibration (static + differential simultaneously)
Ma Measure
0 to 24 mA; ±0.015% of rdg ±0.002 mA
Vdc Measure
0 to 30 VDC; ±0.015% of rdg ±0.002 V (721 models)
Loop Power
Internal 24 V loop supply (721 models)
Fits gas custody-transfer calibration where you need a Fluke 721 with two isolated stainless-steel sensors, 0.025% FS class accuracy, and mA/voltage measurement.
Key advantages
- Dual isolated sensors — Two isolated stainless steel pressure sensors for static/differential custody-transfer work
- Accuracy — 0.025% of full scale class (high-range 5000 psi class listed 0.035% FS on some codes)
- Low + high spans — Low sensor 16 or 36 psig class paired with high ranges to 100…5000 psi by model
- Electrical — Measures 4–20 mA and voltage; 24 V loop supply on 721 (not Ex) models
- Options — Pt100 RTD input; extend with 750P modules; 721Ex variants
Typical applications
- Gas custody-transfer static and differential pressure checks.
- Transmitter calibration with dual onboard sensors.
- Sites needing 721Ex intrinsically safe variants.
Selection guide
- Sensor pair — 16 or 36 psig low + high range code (100…5000 psi class)
- 721 vs 721Ex — standard vs IS variant
- RTD / modules — Pt100 option; 750P external modules
Common mistakes
- Ordering 721Ex when you need 24 V loop supply — loop power is on non-Ex 721 models.
- Ignoring the high-sensor accuracy note on 5000 psi codes (0.035% FS class).
- Assuming a hand pump is built in — 721 is dual-sensor indicator/calibrator class, not a 718-style internal pump.
When to RFQ / what to tell us
- Low/high sensor pair and 721 vs 721Ex.
- RTD / 750P needs; quantity; ship-to.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 12354 |
| Brand | Fluke |
| Model | 721 Dual Range Pressure Calibrator |
| Product type | Pressure Calibrator |
| Accuracy | 0.025% FS class (two isolated stainless steel sensors); some 5000 psi high sensors 0.035% FS |
| mA / electrical | Measures 4–20 mA and voltage; 24 V loop supply on non-Ex 721 models |
| Features | Dual isolated sensors for gas custody-transfer calibration; Pt100 RTD input option; Extends range with 750P modules; 721Ex variants |
| Sensor pairs | Low sensor 16 or 36 psig class with high ranges 100…5000 psi by model code |
Documents
FAQ
Q: Why dual sensors? A: Simultaneous static and differential pressure for custody-transfer style checks.
Q: Accuracy? A: 0.025% FS class on listed sensors; some 5000 psi high sensors 0.035% FS.
Q: What should I send for a quote? A: Sensor pair, Ex yes/no, RTD/modules, quantity, ship-to.
Links
| Parameter | Value |
|---|---|
| Sensor Configuration | Dual isolated stainless-steel sensors: low 16 or 36 psig + high 100…5000 psi options |
| Pressure Accuracy | 0.025 % of full scale (typical high/low sensors; 0.035 % FS on 5000 psi) |
| Application | Gas custody transfer / gas flow calibration (static + differential simultaneously) |
| Ma Measure | 0 to 24 mA; ±0.015% of rdg ±0.002 mA |
| Vdc Measure | 0 to 30 VDC; ±0.015% of rdg ±0.002 V (721 models) |
| Loop Power | Internal 24 V loop supply (721 models) |
| Temperature Input | Pt100 RTD input −40 to 150 °C (optional 720RTD probe) |
| Engineering Units | 19 pressure units selectable |
| External Modules | 750P Series modules 0–1 inH2O to 10,000 psi (721 models) |
| Operating Temperature | −10 °C to +50 °C (721); −10 °C to +45 °C (721Ex) |
| Protection Rating | IP-40 |
| Size Weight | 7.9 × 4.3 × 2.3 in (20 × 11 × 5.8 cm); ~1 lb 3 oz |
| Power | 4× AA; >35 hours typical |
| Family | Fluke 721 / 721Ex Precision Pressure Calibrators |