Fluke 716 Manuale utente
716 English Instruction Sheet
Page
1
®
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-Standholster, 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
1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
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
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3
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 (Littelfusetype 2AG).
716
PRESSURE
CALIBRATOR
HOLD
COM
30V
MAX
mA
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
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716
PRESSURE
CALIBRATOR
COM
30V
MAX
mA
SIGNAL
TEST
+–
Pressure
Module
Red
Black
DAMPUNITS
MIN
MAX
ZERO CLR
HOLD
qn006f.eps
716 English Instruction Sheet
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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
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9
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
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Replacing the Fuse
WWarning
To avoid personal injury or damage to the
Calibrator, use only a 0.125A 250 V fast fuse,
Littelfuse2AG.
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.
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