Fluke 716 Manuale utente

716 English Instruction Sheet

Page

716

Pressure Calibrator

Instruction Sheet

Introduction

The Fluke Model 716 Pressure Calibrator (hereafter called

“Calibrator”) calibrates P/I (pressure to current) transmitters,

measures pressure via a Fluke 700 Series Pressure Module,

measures current up to 24 mA, and supplies loop voltage. The

Calibrator simultaneously displays pressure and current

measurements.

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. 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 Flex-Standholster, an

installed 9 V alkaline battery, one set of TL75 test leads, one set

of AC70A alligator clips, and this instruction sheet.

If the Calibrator is damaged or something is missing, contact the

place of purchase immediately. Contact your Fluke distributor for

information about accessories. See “How to Contact Fluke.” To

order replacement parts or spares, see “Replacement Parts.”

PN 690008 March 1998

All product names are trademarks of their respective companies.

716 English Instruction Sheet

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Safety Information

Use the Calibrator only as specified in this instruction sheet,

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.

WWarning

To avoid possible electric shock or personal injury:

•Never apply more than 30 V between the mA

terminals, or between either of the mA terminals

and earth ground.

•Remove the test leads from the Calibrator

before you open the battery door.

•Make sure the battery door is closed and

latched before you operate the Calibrator.

•Do not operate the Calibrator if it is damaged.

•Do not operate the Calibrator around explosive

gas, vapor, or dust.

•When servicing the Calibrator, use only

specified replacement parts

•To avoid a violent release of pressure in a

pressurized system, shut off the isolation valve

and slowly bleed off the pressure before you

attach or detach the pressure module to the

pressure line.

Caution

To avoid mechanical, overpressure, or corrosion

damage to the Pressure Module, follow all

procedures in the related

Instruction Sheet

716 English Instruction Sheet

Page

Explanation of International Symbols

The symbols in the table below are used on the Calibrator or in

this instruction sheet.

International Symbols

Symbol Meaning

JEarth ground

IFuse

MBattery

WRefer to this instruction sheet for information about

this feature.

TDouble insulated

Conforms to relevant Canadian Standards

Association directives.

PConforms to European Union directives

716 English Instruction Sheet

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Getting Acquainted with the Calibrator

Press Oto turn the Calibrator on and off. The Calibrator displays

pressure and current measurements simultaneously. See the

figure below.

The upper part of the display shows the applied pressure. Press

Uto select a different pressure unit. When you cycle the

power off and on, the Calibrator retains the pressure unit you last

used.

The lower part of the display shows the current (up to 24 mA)

applied to the current (mA) inputs. The current inputs are fused

with a 0.125 A, 250 V fast fuse (Littelfusetype 2AG).

716

PRESSURE

CALIBRATOR

HOLD

COM

30V

MAX

Current mA

measurement

Pressure

measurement

On/Off Button

Pressure

module input

Current input

DAMPUNITS

MIN

MAX

ZERO CLR

HOLD

qn005f.eps

716 English Instruction Sheet

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Pushbutton Functions

Pushbutton Function

UPress to select a different pressure unit. For higher

pressure module inputs, inappropriate (out-of-

range) units are not available.

Press Oon while pressing Uto source loop

voltage.

DTurns pressure reading damping on and off. With

damping on, the display does not update as

quickly.

ZPress to zero the pressure display. Vent pressure

to atmosphere before you press this pushbutton.

With an absolute Pressure Module, see special

instructions below.

mPress and hold to read the minimum pressure and

current readings since the power was turned on or

cwas pressed.

cPress to clear the MIN and MAX memories.

MPress and hold to read the maximum pressure and

current readings the power was turned on or c

was pressed.

hPress hto freeze the display. The

gsymbol appears on the display. Press h

again to resume normal operation.

716 English Instruction Sheet

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Zeroing with Absolute Pressure Modules

For zeroing, adjust the Calibrator to read a known pressure. This

can be barometric pressure, if it is accurately known, for all but

the 700PA3 module. An accurate pressure standard can also

apply a pressure within range for any Absolute Pressure Module.

Adjust the Calibrator reading as follows:

1. Press and hold Z.

2. Press

cto increase or hto decrease the Calibrator

reading to equal the applied pressure.

3. Release

Zto exit the zeroing procedure.

To convert measurement units to different units displayed on the

Calibrator, use the following sample conversions:

•1 bar = 750 mm Hg (1 mm Hg = 0.0013332 bar)

•1 psi = 2.036 in. Hg ( 1 in. Hg = 0.49115 psi).

Calibrating a P/I Transmitter

To calibrate a P/I (pressure to current) transmitter, apply a

pressure to the transmitter and measure the transmitter’s current

loop output. Connect the Calibrator to the transmitter as shown in

the figure.

716 English Instruction Sheet

Page

716

PRESSURE

CALIBRATOR

COM

30V

MAX

SIGNAL

TEST

+–

Pressure

Module

Red

Black

DAMPUNITS

MIN

MAX

ZERO CLR

HOLD

qn006f.eps

716 English Instruction Sheet

Page

Sourcing Loop Voltage

The Calibrator supplies loop power at 24 V dc to a current

transmitter that is disconnected from the system. Use the

following procedure:

1. With power off, hold down Uwhile pressing Oon. “Loop”

appears in the display.

2. Connect the Calibrator in series with the instrument current

loop as shown below. “Loop” disappears from the display

when the transmitter begins drawing current.

3. Measure loop current in the mA measurement display.

4. Press Ooff to deactivate the 24 V dc supply when you are

done sourcing loop voltage.

SIGNAL

TEST

+–

qo007f.eps

Maintenance

For maintenance procedures not described in this instruction

sheet, or if the Calibrator needs repair, contact a Fluke Service

Center.

In Case of Difficulty

•Check the battery, test leads, and pressure tubing. Replace

as necessary.

•Review this instruction sheet to make sure you are using the

Calibrator correctly.

716 English Instruction Sheet

Page

If the Calibrator needs repair, and the Calibrator is under

warranty, see the warranty statement for terms. If the warranty

has lapsed, the Calibrator will be repaired and returned for a

fixed fee.

Cleaning

Periodically wipe the case with a damp cloth and detergent; do

not use abrasives or solvents.

Calibration

Calibrate your Calibrator once a year to ensure that it performs

according to its specifications. A calibration manual is available

(PN 686540). Call 1-800-526-4731 from the U.S.A. and Canada.

In other countries, contact a Fluke Service Center.

Replacing the Battery

When the Bsymbol appears on the display, replace the

battery with a 9 V alkaline battery.

WWarning

To avoid false readings, which could lead to

possible electric shock or personal injury, replace

the battery as soon as the battery indicator B

appears.

it07f.eps

716 English Instruction Sheet

Page

Replacing the Fuse

WWarning

To avoid personal injury or damage to the

Calibrator, use only a 0.125A 250 V fast fuse,

Littelfuse2AG.

Fuse F1 is probably blown if the mA measurement display

reading does not respond to current applied to the current (mA)

inputs.

Replace the fuse as follows:

1. Remove the test leads and turn the Calibrator off.

2. Remove the battery door.

3. Remove the three Phillips-head screws from the case

bottom and turn the case over.

4. Gently lift the top cover from the end nearest the current

(mA) inputs until it unsnaps from the bottom cover.

5. Replace the fuse with a 0.125 A 250 V fast fuse, Littelfuse

type 2AG.

6. Carefully fit the case top and circuit board assembly

together, making sure that the O-ring is properly seated

between the pressure sensor and the pressure fitting on the

case top. Fit the case bottom onto the case top, engaging

the two snaps near the display end of the case. Reinstall the

three screws.

7. Replace the battery door.

Indice

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