721 Pressure Calibrator Calibration Manual January 2014 © 2014 Fluke Corporation. All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.
LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days.
Table of Contents Title Introduction ............................................................................................ Contact Fluke ........................................................................................ Safety Information ................................................................................. Symbols ................................................................................................. Specifications ........................................................
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List of Tables Table Title 1. 2. 3. 4. 5. 6. 7. 8. 9. Symbols..................................................................................................... Required Equipment for Verification and Calibration ................................ Pressure Verification Tests ....................................................................... DC Voltage Measure Verification Tests .................................................... DC Current Measure Verification Tests ...............................
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List of Figures Figure 1. 2. Title Page Battery Replacement ................................................................................. 17 User-Replaceable Parts ............................................................................
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Introduction The 721 Pressure Calibrator (the Product) is a simple to use and versatile pressure calibrator. The two internal pressure sensors are configured with different pressure measurement ranges. One range for lower pressure (P1) and one range for higher pressure (P2). The Product features inputs for mA, switch contacts, and an RTD probe. An external pressure module option gives a wider range of pressure calibration options that include absolute and differential pressure measurement.
721 Calibration Manual Safety Information A Warning identifies conditions and procedures that are dangerous to the user. A Caution identifies conditions and procedures that can cause damage to the Product or the equipment under test. Warning To prevent possible electrical shock, fire, or personal injury: 2 • Only assemble and operate high-pressure systems if you know the correct safety procedures.
Pressure Calibrator Symbols • Push the ZERO button to zero the pressure sensor when vented to atmospheric pressure. • Remove the batteries if the Product is not used for an extended period of time, or if stored in temperatures that exceed the battery manufacturer’s specifications. If the batteries are not removed, battery leakage can damage the Product. • Replace the batteries when the low battery indicator shows to prevent incorrect measurements.
721 Calibration Manual Specifications Conditions for specifications are15 °C to 35 °C unless otherwise noted. Environmental Operating Temperature ........................... -10 °C to +50 °C (14 °F to +122 °F) Storage With Batteries ....................................... Per battery manufacturer’s specification, not to exceed storage specification without batteries. Without Batteries .................................. -20 °C to +60 °C (-4 °F to +140 °F) Altitude ..........................................
Pressure Calibrator Specifications 1-year Specifications Model Low Pressure Sensor High Pressure Sensor Calibrator Range Resolution Accuracy Description Sensor 1 Sensor 1 Sensor 1 721-1601 16 PSIG, 100 PSIG 721-1603 16 PSIG, 300 PSIG 721-1605 16 PSIG, 500 PSIG 721-1610 16 PSIG, 1000 PSIG 721-1615 16 PSIG, 1500 PSIG 721-1630 16 PSIG, 3000 PSIG 721-1650 16 PSIG, 5000 PSIG 721-3601 36 PSIG, 100 PSIG 721-3603 36 PSIG, 300 PSIG 721-3605 36 PSIG, 500 PSIG 721-3610 36 PSIG, 1000 PS
721 Calibration Manual Required Equipment The equipment listed in Table 2 is necessary to do the performance verification tests and calibration adjustment. Table 2. Required Equipment for Verification and Calibration Equipment Minimum Specifications Recommended Model Low-thermal EMF banana to banana leads - Pomona 2948-36-2 (red) and 2948-36-0 (black) RTD adapter - Fluke 720URTDA 0 V to 30 V Accuracy: 0.006 % rdg ±0.5 mV Calibrator/Resistance Standard 0 mA to 24 mA Accuracy: 0.006 % rdg ±0.
Pressure Calibrator Performance Verification Tests Pressure Verification To do the pressure verification test: 1. Carefully attach the pressure fitting of the Pressure Controller/Calibrator or Piston Gauge (called pressure source for the remainder of this procedure) to the first pressure port of the Product. Note Use plenty of TEFLON tape when attaching pressure fitting. The display should read 0.00 PSI with the deadweight tester opened up to ambient air. If not, push Z until both displays read 0.00 PSI.
721 Calibration Manual Table 3. Pressure Verification Tests (cont.) 100 PSI Input Pressure Lower Limit 300 PSI Upper Limit Input Pressure Upper Limit 100.00 99.975 100.025 300.00 299.92 300.08 80.00 79.975 80.025 240.00 239.92 240.08 60.00 59.975 60.025 180.00 179.92 180.08 40.00 39.975 40.025 120.00 119.92 120.08 20.00 19.975 20.025 60.00 59.92 60.08 0.00 -0.025 0.025 0.00 -0.08 0.08 -6.00 -6.025 -5.975 -6.00 -6.08 -5.92 -12.00 -12.025 -11.975 -12.00 -12.
Pressure Calibrator Performance Verification Tests Table 3. Pressure Verification Tests (cont.) 5000 PSI Input Pressure Lower Limit Upper Limit 5000.0 4998.2 5001.8 4000.0 3998.2 4001.8 3000.0 2998.2 3001.8 2000.0 1998.2 2001.8 1000.0 998.2 1001.8 0.0 -1.8 1.8 10. Carefully vent all pressure and disconnect the second pressure port. DC Voltage Measure Verification To do the dc voltage measure verification test: 1.
721 Calibration Manual DC Current Measure Verification To do the dc current measure verification test: 1. Push repeatedly until mA is shown in the third row of the Product display. 2. Connect the Product red banana jack (V mA) to the Calibrator HI mA output. 3. Connect the Product black banana jack (COM) to the Calibrator LO mA output. 4. Set the Calibrator for the current setting in Table 5, and verify the display reading on the Product. Table 5.
Pressure Calibrator Performance Verification Tests 720RTD Probe Verification This is an optional test for a Product that is paired with a 720RTD. To do this test: 1. Push repeatedly until RTD is shown in the third row of the Product display. 2. Plug the 720RTD probe into the Product. 3. Insert the probe into the Metrology Well. 4. Set the Metrology Well to the temperatures in Table 7, after the Well stabilizes, verify that the display readings are within tolerance. Table 7.
721 Calibration Manual Calibration Adjustment The Product has an electronic calibration process. There are no mechanical adjustments and the calibration is done with the case closed. A serial communications port is used for the calibration process to send commands and receive readings. The normal RS232 interface is used. Calibration can be done with a terminal program or an automated-calibration program can be written with programs like MetCal. In this manual, only the serial terminal mode is described.
Pressure Calibrator Calibration Adjustment Adjust Voltage Input To adjust the voltage input: 1. Use the test lead set to attach the voltage output of the Calibrator to the input of the Product. 2. Send this command to put the Product into Voltage mode: FUNC LOWER,DCV 3. Use the Calibrator to input 0 V. 4. When the reading is stable, send this command: CAL_POINT[0] [0] 5. Use the Calibrator to input 30 V. 6. When the reading is stable, send this command: CAL_POINT[0][1] 7.
721 Calibration Manual Adjust RTD Before the adjustment, make these connections: 1. Plug the RTD Adapter into the Product. 2. Connect the high side of the current output (ohms measure) jacks of the RTD Adapter to the high side of the current input of the Resistance Standard. 3. Connect the low side of the current output (ohms measure) of the RTD Adapter to the low side of the current input of the Resistance Standard. 4.
Pressure Calibrator Calibration Adjustment Adjust Pressure The Product uses a 1/8 inch NPT female connection in the pressure input port. Various adapters may be necessary to connect to the pressure standard. Always make sure the hose, tubing, fittings, etc., have a rated working pressure at or above the pressure of the Product. It is important that there are no leaks. Use Teflon tape where appropriate. To adjust the pressure: 1.
721 Calibration Manual Maintenance Replace the Batteries If the batteries discharge too far, the Product automatically shuts down to prevent battery leakage. Note Use only AA size alkaline batteries. Warning To prevent possible electrical shock, fire, or personal injury: • Remove the batteries if the Product is not used for an extended period of time, or if stored in temperatures above 50 °C. If the batteries are not removed, battery leakage can damage the Product.
Pressure Calibrator Maintenance hmq061.eps Figure 1.
721 Calibration Manual Clean the Product Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers. Clean the Product with a soft cloth dampened with water or water and mild soap. User-Replaceable Parts Warning To prevent possible electrical shock, fire, or personal injury, use only specified replacement parts. User-replaceable parts are listed in Table 8 and shown in Figure 2. For more information about these items, contact a Fluke representative.
Pressure Calibrator Accessories Table 9. User-Replaceable Parts and Accessories (cont.) Item Number Description Qty Part Number Not Shown Decal, Manifold Range,5000 Psi 1 4110754 Not Shown Decal, Manifold Range 16psi 1.1bar 1 4374274 Not Shown Decal, Manifold Range 36psi 2.5bar 1 4374288 Not Shown Decal, Manifold Range 1500psi 100bar 1 4374301 Not Shown Fluke-721,Decal, Rear, Serial Number Plate 1 4364755 Not Shown Tie, Cable, 4" 1 172080 See www.fluke.
721 Calibration Manual 1 2 3 4 5 7 8 6 9 10 11 12 13 14 15 hmq101.eps Figure 2.
