721 Pressure Calibrator Users Manual October 2013 © 2013 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 This Fluke product will be free from defects in material and workmanship for three years from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.
Table of Contents Title Page Introduction .................................................................................................................... Contact Fluke ................................................................................................................. Safety Information .......................................................................................................... Symbols ........................................................................................
721 Users Manual MINMAX ................................................................................................................... SET UNITS ............................................................................................................... CONTRAST .............................................................................................................. Lock and Unlock Configurations (CFG) .................................................................... AUTO OFF ...............
List of Tables Table 1. 2. 3. 4. 5. Title Page Symbols................................................................................................................................. Product Features ................................................................................................................... Display Functions .................................................................................................................. Ranges and Resolutions ...................................
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List of Figures Figure 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Title Page Product Interface ................................................................................................................... Display................................................................................................................................... Pressure Switch Connection ................................................................................................. Percent Error Function Connection ...........
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Introduction Contact Fluke 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 Users 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. Do not touch voltages > 30 V ac rms, 42 V ac peak, or 60 V dc. • Remove all probes, test leads, and accessories before the battery door is opened.
Pressure Calibrator Safety Information • • Pressure sensors can be damaged and/or personnel injury can occur due to improper application of pressure. Vacuum should not be applied to any gauge pressure sensor. The Product display shows “OL” when an inappropriate pressure is applied. If “OL” is shown on any pressure display, the pressure should be reduced or vented immediately to prevent Product damage or possible personnel injury.
721 Users Manual Symbols Symbols used on the Product or in this manual are shown in Table 1. Table 1. Symbols Symbol Symbol Description Risk of Danger. Important information. See Manual. Conforms to relevant North American Safety Standards. Hazardous voltage. Risk of electric shock. Double Insulated Conforms to European Union directives. Inspected and licensed by TÜV Product Services.
Pressure Calibrator Standard Equipment Standard Equipment Product Features Make sure that the Product shipment is complete. It must include: Figure 1 and Table 2 shows the location of the buttons, pressure controls, connection ports, and electrical inputs.
721 Users Manual 2 F1 F2 3 F3 12 1 ZERO V mA 30V 24mA MAX COM 11 4 6 5 8 10 7 9 hmq001.eps Figure 1.
Pressure Calibrator Product Features Table 2. Product Features Item Description Power button. Turns on and off the Product Function buttons. Used to configure the Product. These keys correspond to messages on the display. Zero button. Zeros pressure measurements. Backlight button. Push to turn the backlight on or off. COMMON input Input terminals to measure current, volts, and a contact closer for switch test.
721 Users Manual Notes When is pushed to turn on the Product, a short startup self-check routine is run. During that routine, the display shows the current firmware revision level, auto-shutdown status, and the range of the internal pressure sensors. A maximum of 5 minutes warm-up is necessary for the product to reach rated accuracy. A longer warm-up period can be necessary for large changes in ambient temperature. See the “Zero Function Use” section for more about zeroing the pressure sensor displays.
Pressure Calibrator Product Features Table 3. Display Functions Item Number Name Primary Parameters Description Language Selection The user interface is available in three languages: • English Shows what is being measured. • Norwegian • German Span Indicator Shows the percent of the 4 mA to 20 mA span. (For mA functions only.) To select a language: Pressure Units Shows one of 17 pressure units available for display. Units Shows the unit of measure for the display. 1.
721 Users Manual Home Menu Functionality External Sensor (Absolute) There are three options for the Home Menu: If the active display shows a selected absolute module, and Z is pushed, push (SET) and you are prompted to set or default the pressure reference. This is done with and (the up and down arrows). The sensor port must be open (vented) to atmosphere while this procedure is done. Push (SET REF DONE) when zero adjust is complete.
Pressure Calibrator Menus Menus There are 11 sub menus that can be accessed from (Main Menu). Push to go to the next menu selection. For the last menu, push (DONE) to return to the Main Menu. SWITCHTEST To access the SWITCHTEST menu, push . SWITCHTEST is shown on the menu bar. Connect a pressure switch to the Product as shown in Figure 3.
721 Users Manual Pressure Switch F1 F2 F3 To do a switch test: 1. Use the P1, P2, or external pressure input connections to connect the Product to the input of the switch. Connect the contact output of the switch to the COM and V mA terminals of the Product. The polarity of the terminals does not matter. 2. Connect the pump to the Product and the pressure switch. 3. Make sure the vent on the pump is open. 4. Zero the Product if necessary. 5. Close the vent after the Product is zeroed. 6.
Pressure Calibrator Menus 9. Once the switch is open, “OPEN” will be shown. Bleed the pump slowly until the pressure switch closes. hix044.eps hix043.eps 10. At the top of the display it will now read, “SW OPENED AT” and show the pressure at which the switch opened.
721 Users Manual 11. Push the “NEXT” option to view when the switch closed, and the dead band. hix046.eps hix045.eps 12. Push the “NEW TEST” option to clear the data and do another test. 13. Push to end the test and return to the main menu. %ERROR The Product features a unique function which can calculate pressure vs. milliamp error as a percentage of the 4 mA - 20 mA loop span. The %ERROR mode uses all three screens and has a unique menu structure.
Pressure Calibrator Menus F1 F2 F3 ZERO V mA 30V 24mA MAX COM hmq019.eps Figure 4.
721 Users Manual Example: A pressure transmitter under test is 30 psi (2 Bar) FullScale and outputs a corresponding 4 mA to 20 mA signal. Program a 0 psi to 30 psi pressure span into the Product and the Product calculates and shows the deviation or %Error from the expected 4 mA to 20 mA output. This eliminates the need for manual calculations and helps when it is difficult to set an exact pressure with an external pump.
Pressure Calibrator Menus MINMAX The Product has a min/max feature to capture the minimum and maximum values of any displayed parameter. To use the MINMAX menu: 1. Push to access the menus. 2. Push to step through the menu until MINMAX is shown on the menu bar. 3. Push to toggle the display through the min and max values that are stored in the min/max registers. These readings are live so that the new min/max values will be recorded while in this mode. hix056.
721 Users Manual SET UNITS • inHg 0 °C Use the SET UNITS menu to select the measurement units for each port. To use this menu: • mmHg 0 °C • kg/cm2 • mmH2O 4 °C • mmH2O 20 °C • ftH2O 60 °F • psi • inH2O 4 °C • inH2O 20 °C • inH2O 60 °F • cmH2O 4 °C • cmH2O 20 °C • bar • mbar • MPa • kPa 1. Push to access the menus. 2. Push to step through the menu until SET UNITS is shown on the menu bar. 3. Push to select the necessary unit.
Pressure Calibrator Menus 4. Push to move through each port (P1, P2, or EXT) and change any necessary values. 5. Push when finished with units selection. CONTRAST Lock and Unlock Configurations (CFG) Use the LOCK CFG or UNLOCK CFG options of the Configuration Lock Menu (CONFIG), shown below, to lock or unlock the display configuration. Use the Contrast menu to adjust the display contrast. 1. Push to access the menus. 2. Push to step through the menu until CONTRAST is shown on the menu bar.
721 Users Manual You will also notice that some menu choices disappear when the LOCK CFG is used. When the UNLOCK CFG option is selected, the configuration is unlocked and the menu display goes to the subsequent menu. hix032.eps AUTO OFF The Product can be set to automatically power off after a chosen number of minutes. This function can also be disabled. To set the auto off parameters: 1. Push to access the menus. 2. Push to step through the menu until AUTO OFF is shown on the menu bar. 3.
Pressure Calibrator Menus RESOLUTION HART To choose between a low or high resolution display: An internal 250 Ω HART resistor can be enabled when the Product operates in the mA Measure-24 V mode. This lets a HART Communicator be connected across the mA terminals. It is not necessary to add an external resistor. 1. Push to access the menus. 2. Push to step through the menu until RESOLUTION is shown on the menu bar. 3. Push to select the Resolution menu. 4.
721 Users Manual 4. PROBE TYPE To select an external RTD probe for use with the Product: 1. Push to access the menus. 2. Push to step through the menu until PROBE is shown on the menu bar. Push to select the necessary probe type (see the figure below). Push to store the change and go to the Main Menu. Note The default probe type is PT100-385. SELECT RTD PROBE TYPE hix035.eps 3. 22 Push on to select the Probe type. The probe choices are: • P100-385 • P100-392 • P100-JIS hix036.
Pressure Calibrator Menus The standard probe has a 10-inch insertion depth with a ¼-inch diameter stainless steel sheath. See Figure 5. Note The factory default type is PT100-385 so if the Product is used with the Fluke 720 RTD Probe (pn 4366669), it is not necessary to set the probe type. Connect the probe to the Product and configure the display to read temperature.
721 Users Manual DAMP Turn on or off Damping with the DAMP menu selection. When damping is on, the Product shows a running average from ten measurements. The Product makes approximately three indications per second. To use the Damping function: To measure pressure, connect the Product with the correct fitting and select a pressure port. The Product has two internal sensors and many optional external sensors (EPMs) are available. Make sure to choose the sensor based on working pressures and accuracy.
Pressure Calibrator Media Compatibility • Push Z to zero the pressure sensor when vented to atmospheric pressure. Note To ensure accuracy of the Product, the Product must be zeroed before a device is calibrated. See the “Zero Function Use” section. Media Compatibility The Product has a media-isolated sensor to prevent sensor contamination. Whenever possible, clean dry air is the media of choice. If this is not possible, make sure the media is compatible with Nickel Plated Brass and 316 Stainless Steel.
721 Users Manual F1 F2 F1 F3 F2 F3 24 V ZERO ZERO V mA 30V 24mA MAX COM 4 to 20mA Device Under Test V mA 30V 24mA MAX 4 to 20mA UUT COM hmq011.eps Figure 6.
Pressure Calibrator Measurements F1 F2 F3 ZERO V mA 30V 24mA MAX Up to 30V Device Under Test COM hmq015.eps Figure 7.
721 Users Manual Pressure-to-Current Transmitter Calibration Transmitter Calibration mA Input Function To calibrate a pressure-to-current transmitter (P/I): The mA input function reads back the 4 mA to 20 mA output from the device being calibrated. This can be done passively. The device under test directly generates 4 mA to 20 mA and can be read by the Product. 1. Connect the Product and the pump to the transmitter. See Figure 8. 2. Apply pressure with the pump. 3.
Pressure Calibrator Transmitter Calibration F1 F2 F3 ZERO V mA 30V 24mA MAX COM hmq018.eps Figure 8.
721 Users Manual Ranges and Resolution Ranges and resolutions for the Product are shown in Table 4. Table 4. Ranges and Resolutions Range (PSI) Burst Pressure Proof Pressure (PSI) Engineering Unit psi bar mbar kPa MPa kg/cm2 cmH20 @ 4 °C cmH20 @ 20 °C mmH20 @ 4 °C mmH20 @ 20 °C inH20 @ 4 °C inH20 @ 20 °C inH20 @ 60 °F mmHg @ 0 °C inHg @ 0 °C • • 30 Factor 1 0.06894757 68.94757 6.894757 0.00689476 0.07030697 70.3089 70.4336 703.089 704.336 27.68067 27.72977 27.70759 51.71508 2.
Pressure Calibrator Maintenance 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, Lithium batterie, or rechargeable NiMh cells. 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.
721 Users Manual To change the batteries, see Figure 9: 1. Turn off the Product. 2. Turn the Product so that the display is down. 3. With a flat-head screwdriver, remove the battery door screw. 4. Replace the four AA batteries with new batteries. Make sure that the polarity on the batteries is correct. 5. Replace the battery door. 6. Tighten the battery door screw. Clean the Product Caution To avoid damaging the plastic lens and case, do not use solvents or abrasive cleansers.
Pressure Calibrator User-Replaceable Parts and Accessories User-Replaceable Parts and Accessories Item Warning To prevent possible electrical shock, fire, or personal injury, use only specified replacement parts. User-replaceable parts are listed in Table 5 and shown in Figure 10 . For more information about these items, contact a Fluke representative. See the “Contact Fluke” section of this manual. Table 5.
721 Users Manual 1 3 2 6 4 7 8 5 hmq065.eps Figure 10.
Pressure Calibrator Specifications Specifications (15 °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 ......................................................
721 Users Manual Physical Dimensions (with holster) ......................... (H x W x D) (20 x 11 x 5.8) cm, (7.9 x 4.3 x 2.3) in Weight (with holster) ................................ 0.539 kg (1 lb 3 oz) EMI/RFI Conformance .............................. EN50082-1 and EN55022: Class B Ingress Protection ..................................... IP40 Connectors/Ports Pressure.............................................. Two, 1/8 in NPT, 700P Series Pressure Module RTD.........................................
Pressure Calibrator Specifications 1-year Specifications Model Low Pressure Sensor High Pressure Sensor Calibrator Range Resolution Accuracy Range Resolution Accuracy Description Sensor 1 Sensor 1 Sensor 1 Sensor 2 Sensor 2 Sensor 2 721-1601 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 -14 psi + 16 psi 0.001 psi, -0.97 bar to 0.0001 bar 1.
721 Users Manual 1-year Specifications Model High Pressure Sensor Calibrator Range Resolution Accuracy Range Resolution Accuracy Description Sensor 1 Sensor 1 Sensor 1 Sensor 2 Sensor 2 Sensor 2 721-3601 36 PSIG, 100 PSIG 721-3603 36 PSIG, 300 PSIG 721-3605 36 PSIG, 500 PSIG 721-3610 36 PSIG, 1000 PSIG 721-3615 36 PSIG, 1500 PSIG 721-3630 36 PSIG, 3000 PSIG 721-3650 36 PSIG, 5000 PSIG 38 Low Pressure Sensor -14 psi + 36 psi 0.001 psi, -0.97 bar to 0.0001 bar 2.48 bar 0.
Pressure Calibrator Specifications Electromagnetic Environment .......................IEC 61326-1: Portable Electromagnetic Compatibility .......................Applies to use in Korea only. Class A Equipment (Industrial Broadcasting & Communication Equipment) [1] [1] This product meets requirements for industrial (Class A) electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and is not to be used in homes.
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