Fluke 721 Precision Pressure Calibrator

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Pressure Calibration and Temperature Measurement for Custody Transfer Applications

The ideal tool for gas custody transfer applications is the Fluke 721 Precision Pressure Calibrator. With dual isolated pressure sensors, it allows you to take simultaneous static and differential pressure measurements with a single tool.

The 721 can be configured by selecting either a 16 PSI (1.1 bar) or 36 psi (2.48 bar) low pressure sensor then add any of 7 high pressure ranges including 100, 300, 500, 1000, 1500, 3000 or 5000 psi (6.9, 20, 24.5, 69, 103.4, 200, 345 bar). 

  • Ideal for gas flow calibration (custody transfer) applications
  • Two isolated, stainless steel, pressure sensors with 0.025 % accuracy
  • Pt100 RTD input for temperature measurement, (probe optional)
  • Measures 4 to 20 mA signals
  • Internal 24 V loop power supply can power a transmitter under test
  • Measure up to 30 V dc, check 24 V loop power supplies
  • Extend pressure measurement range with connection to external 700 series pressure modules (29 ranges)
  • Large backlit graphic display can display up to three inputs simultaneously
  • Store five instrument setups for recall and use



 
Specification

Specifications 1-Year
Fluke-721-1601 Range Resolution Accuracy
Low pressure sensor
-14 psi to +16 psi,
-0.97 bar to 1.1 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 psi to +100 psi,
-0.83 bar to 6.9 bar
0.01 psi,
0.0001 bar
0.025% of full scale
Fluke-721-1603 Low pressure sensor
-14 psi to +16 psi,
-0.97 bar to 1.1 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 psi to +300 psi,
-0.83 bar to 20 bar
0.01 psi,
0.001 bar
0.025% of full scale
Fluke-721-1605 Low pressure sensor
-14 psi to +16 psi,
-0.97 bar to 1.1 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 psi to +500 psi,
-0.83 bar to 34.5 bar
0.01 psi, 
0.001 bar
0.025% of full scale
Fluke-721-1610 Low pressure sensor
-14 psi to +16 psi,
-0.97 bar to 1.1 bar
0.001 psi, 
0.0001 bar
0.025% of full scale
High pressure sensor
0 psi to +1000 psi,
0.00 bar to 69 bar
0.1 psi, 
0.001 bar
0.025% of full scale
Fluke-721-1615 Range Resolution Accuracy
Low pressure sensor
-14 psi to +16 psi,
-0.97 bar to 1.1 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
0 psi to +1500 psi,
0.00 bar to 103.4 bar
0.1 psi, 
0.001 bar
0.025% of full scale
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 full scale
High pressure sensor
0 psi to +3000 psi,
0.00 bar to 200 bar
0.1 psi, 
0.01 bar
0.025% of full scale
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 full scale
High pressure sensor
0 psi to +5000 psi, 
0.00 bar to 345 bar
0.1 psi, 
0.01 bar
0.035% of full scale
Fluke-721-3601 Range Resolution Accuracy
Low pressure sensor
-14 psi to +36 psi, 
-0.97 bar to 2.48 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 to +100 psi, 
-0.83 bar to 6.9 bar
.01 psi, 
0.0001 bar
0.025% of full scale
Fluke-721-3603 Low pressure sensor
-14 psi to +36 psi, 
-0.97 bar to 2.48 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 psi to +300 psi, 
-0.83 bar to 20 bar
0.01 psi, 
0.001 bar
0.025% of full scale
Fluke-721-3605 Low pressure sensor
-14 psi to +36 psi, 
-0.97 bar to 2.48 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
-12 psi to +500 psi, 
-0.83 bar to 34.5 bar
0.01 psi, 
0.001 bar
0.025% of full scale
Fluke-721-3610 Range Resolution Accuracy
Low pressure sensor
-14 psi to +36 psi, 
-0.97 bar to 2.48 bar
0.001 psi,
0.0001 bar
0.025% of full scale
High pressure sensor
0 psi to +1000 psi, 
0.00 bar to 69 bar
0.1 psi, 
0.001 bar
0.025% of full scale
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 full scale
High pressure sensor
0 psi to +1500 psi, 
0.00 bar to 103.4 bar
0.1 psi, 
0.01 bar
0.025% of full scale
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 full scale
High pressure sensor
0 psi to +3000 psi, 
0.00 bar to 200 bar
0.1 psi, 
0.01 bar
0.025% of full scale
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 full scale
High pressure sensor
0 psi to +5000 psi, 
0.00 bar to 345 bar
0.1 psi, 
0.01 bar
0.035% of full scale
General Specifications
Instrument setup recall Last used on power-up
Environmental 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 >35 hours, typical usage
Batteries required (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 03539 kg (1 lb 3 oz)
Connectors/ports pressure Two, 1/8 in NPT, 700P Series Pressure Module; RTD Probe
Electrical and Temperature Measurement 1-Year
Function Range Resolution Accuracy
mA measure 0 to 24 mA 0.001 mA ±0.015% of rdg
±0.002mA
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 ohms
±0.1°C (±0.2°F)
±0.25°C (±0.45°F) combined uncertainty when using 720 RTD probe accessory
Loop power supply 24 V N/A 24 mA @ 24 V
¹Temperature measurement requires optional Fluke-720RTD Pt-100 RTD probe available as an accessory
Temperature Effect
No effect on accuracy on all functions from 15°C to 35°C
Add ±0.002% F.S./°C for temps outside of 15°C to 35°C
Available Pressure Engineering 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

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