Fluke FLUKE-718 Manuale utente

718 Series

Pressure Calibrator

Users Manual

July 1998 Rev. 4, 3/06

All product names are trademarks of their respective companies.

Table of Contents

Title Page

Introduction..................................................................................................................... 1

Safety Information .......................................................................................................... 2

Getting Acquainted with the Calibrator ........................................................................... 6

Power Saver.............................................................................................................. 6

Switch Test..................................................................................................................... 8

Zeroing with Absolute Pressure Modules ....................................................................... 9

Calibrating a P/I Transmitter........................................................................................... 10

Using the Internal Pump ............................................................................................ 10

Pump Valve Assembly Cleaning Instructions ................................................................. 15

Using an External Pump................................................................................................. 16

External Fluke Pressure Module Compatibility ............................................................... 18

Sourcing Loop Voltage ................................................................................................... 19

Percent Error Setup........................................................................................................ 19

Maintenance................................................................................................................... 20

In Case of Difficulty.................................................................................................... 20

Cleaning .................................................................................................................... 20

Calibration ................................................................................................................. 20

718 Series

Users Manual

Replacing the Batteries ............................................................................................. 21

Parts and Accessories ................................................................................................... 22

Specifications................................................................................................................. 25

Pressure Sensor Input .............................................................................................. 25

Pressure Module Input .............................................................................................. 25

DC mA Input ............................................................................................................. 25

Loop Supply .............................................................................................................. 25

General Specifications .............................................................................................. 26

How to Contact Fluke..................................................................................................... 27

iii

List of Tables

Table Title Page

1. Input Units ............................................................................................................................. 2

2. Safety Information ................................................................................................................. 3

3. International Electrical Symbols............................................................................................. 5

4. Pushbutton Functions............................................................................................................ 7

5. Pump Features...................................................................................................................... 10

6. Recommended Pressure Modules ........................................................................................ 14

7. Fluke Pressure Module Compatibility .................................................................................... 18

8. Replacement Parts................................................................................................................ 22

718 Series

Users Manual

List of Figures

Figure Title Page

1. Connection Technique........................................................................................................... 5

2. Front Panel Features............................................................................................................. 6

3. Pump Features...................................................................................................................... 9

4. Internal Pressure Sensor with Internal Pump ........................................................................ 12

5. Pressure Module with Internal Pump..................................................................................... 13

6. Pressure Module with External Pump.................................................................................... 17

7. Sourcing Loop Voltage .......................................................................................................... 19

8. Battery Replacement............................................................................................................. 21

9. Replacement Parts................................................................................................................ 24

718 Series

Users Manual

Pressure Calibrator

Introduction

The Fluke 718 Series Pressure Calibrators do the

following:

•Calibrate P/I (pressure to current) transmitters

•Measure pressure via a 1/8-inch NPT pressure fitting

and an internal pressure sensor or via a Fluke 700

Series Pressure Module

•Source pressure

•Measure current up to 24 mA

•Simultaneously display pressure and current

measurements.

•Supply loop voltage

•Calculate mA percentage in Percent Mode

•Calculate mA error % in Percent Error Mode

The 718 Pressure Calibrators (hereafter, “the Calibrator”)

include:

•718 1G

•718 30G

•718 100G

•718 300G

The Calibrator makes 5-digit pressure readings in the

following units: psi, inH2O at 4 °C, inH2O at 20 °C, kPa,

cmH2O at 4 °C, cmH2O at 20 °C, bar, mbar, kg/cm2, inHg,

and mmHg.

Pressure sensor specifications are as listed under

“Pressure Sensor Input”.

The Calibrator measures pressure sensor inputs in the

units shown in Table 1.

For pressure modules, full scale readings for all pressure

ranges can be made in psi, kPa, and inHg units. To avoid

display overflow, full scale readings are limited to 1000 psi

in cmH2O, mbar, and mmHg units, and 3000 psi in inH2O

units. Pressures of at least 15 psi must be measured for

meaningful readings in bar and kg/cm2units.

Your Calibrator is supplied with a holster, two installed 9 V

alkaline batteries, one set of TL75 test leads, one set of

AC70A alligator clips, one 700-ILF In-Line Filter (to protect

the pump), a Product Overview Manual, and a CD-Rom.

If the Calibrator is damaged or something is missing,

contact the place of purchase immediately. Contact your

Fluke distributor for information about accessories. See

718 Series

Users Manual

“How to Contact Fluke.” To order replacement parts or

spares, see “Parts and Accessories.”

Table 1. Input Units

Displayed Pressure Units

psi

inH2O at 4°C

inH2O at 20°C

cmH2O at 4°C

cmH2O at 20°C

bar

mbar

kPa

inHg

mmHg

kg/cm2

Safety Information

Use the Calibrator only as specified in this Users Manual,

otherwise the protection provided by the Calibrator may be

impaired.

A Warning identifies conditions and actions that pose

hazard(s) to the user; a Caution identifies conditions and

actions that may damage the Calibrator or the equipment

under test.

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