Fluke FLUKE-718 User manual

®
718 Series
Pressure Calibrator
Users Manual
July 1998 Rev. 4, 3/06
© 1998-2006 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

i
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
ii
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
iv

v
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
vi

1
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
2
“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.

Pressure Calibrator
Safety Information
3
Table 2. Safety Information
XW Warning
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.
•Do not use the Calibrator to make measurements in a CAT II, CAT III, or a CAT IV environment.
CAT I equipment is designed to protect against transient from high-voltage, low-energy sources, such
as electronic circuits or a copy machine
•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 using probes, keep fingers behind the finger guards on the probes.
•Use only two 9 V batteries, properly installed in the Calibrator case, to power the Calibrator.
•Follow all equipment safety procedures.
•Turn off circuit power before connecting the Calibrator mA and COM terminals in the circuit. Place
Calibrator in series with the circuit.
•When servicing the Calibrator, use only specified replacement parts.
•Do not allow water inside the case.

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Users Manual
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Table 2. Safety Information (cont.)
XW Warning
•To avoid false readings, which could lead to possible electric shock or personal injury, replace the
battery as soon as the battery indicator Bappears.
•To avoid a violent release of pressure in a pressurized system, shut off the valve and slowly bleed off
the pressure before you attach or detach the internal pressure sensor or pressure module fitting to the
pressure line.
•To avoid over pressure damages, do not apply pressure that exceeds the limits listed in the Pressure
Specifications table in the “Specifications” section.
•To avoid mechanically damaging the Calibrator, do not apply torque between the pressure fitting and
the Calibrator case. See Figure 1 for the proper use of tools.
•To avoid misleading readings, disconnect the pressure module connector at the Calibrator.
•To avoid damage to the pressure module, refer to the related Instruction Sheet.
•To avoid damage to the pump, use with dry air and non-corrosive gases only. Check test leads for
continuity before using. Inspect Calibrator for cracks or damage, do not use the probes if they are
damaged or show high resistance.

Pressure Calibrator
Safety Information
5
Hold in
fixed
position
wh001f.eps
Figure 1. Connection Technique
Table 3. International Electrical Symbols
Symbol Meaning
J Earth ground
I Fuse
M Battery
W Refer to this instruction sheet for
information about this feature.
X Hazardous voltage. Risk of electric
shock.
T Double insulated
) Conforms to relevant Canadian
Standards Association directives.
P Conforms to relevant European Union
directives
f Pressure

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Users Manual
6
Getting Acquainted with the Calibrator
Press Oto turn the Calibrator on and off. The Calibrator
displays pressure and current measurements
simultaneously. See Figure 2.
The upper part of the display shows the applied pressure
or vacuum. (Vacuum is shown as a negative value.) Press
Uto select a different unit. When you cycle the power
off and on, the Calibrator retains the unit you last used.
The lower part of the display shows the current (up to 24
mA) applied to the current (mA) inputs.
To source loop voltage, press Uwhile pressing Oon.
Pushbutton operation is described in Table 4. Pump
features are shown in Figure 3 and described in Table 5.
Power Saver
The Calibrator automatically turns off after 30 minutes of
inactivity. To reduce this time or disable this feature:
1. With the Calibrator OFF, press O.
2. P.S. xx is displayed, where xx is the turn-off time in
minutes. OFF means the power saver is disabled.
3. Press h(W) to decrease or a(X) to increase
the turn-off time.
4. To disable, press huntil the display shows OFF.
The Calibrator resumes normal operation after 2 seconds.
RANGE -1 O 1 PSI
MAX 5 PSI 34.5 P
-7 O 7 kP
Current mA
measurement
Pressure
measurement
Pressure
module input
Pressure
sensor input
(Install filter here)
Current
input
On/Off Button
718
PRESSURE
CALIBRATOR
HOLD
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
UNITS
ZERO
DAMP
mA
MODE
HOLD
LOOP
POWER
BAROMETRIC ADJ.
MIN
MAX
SWITCH
TEST
ENTER
wh005f.eps
Figure 2. Front Panel Features

Pressure Calibrator
Getting Acquainted with the Calibrator
7
Table 4. Pushbutton Functions
Pushbutton Description
UPress to select a different pressure unit. All units are available when the pressure sensor input is used. For
higher pressure module inputs, inappropriate (out-of-range) units are not available. Press Oon while
pressing Uto source loop voltage.
D
ENTER Turns pressure reading damping on and off. With damping on, the Calibrator averages several
measurements before displaying a reading. Press to confirm selection of 0% and 100% output parameters.
ZPress to zero the pressure display. Vent pressure to atmosphere before you press this pushbutton. With an
Absolute Pressure Module, see special instructions below.
NPress to read the minimum pressure and current readings since power was turned on or the registers were
cleared. Press again to read the maximum pressure and current readings since power was turned on. Press
and hold for 3 seconds to clear the MIN/MAX registers.
SPress to perform switch test.
Z
aPress to toggle the mA display mode between mA, mA Percent, and mA Percent Error.
h
WPress hto freeze the display. The gsymbol appears on the display. Press hagain to resume
normal operation.

718 Series
Users Manual
8
Switch Test
To perform a switch test, do the following:
Note
This example uses a normally closed switch. The
procedure is the same for an open switch but the
display reads OPEN instead of CLOSE.
1. Connect the Calibrator mA and COM terminals to the
switch using the pressure switch terminals and
connect an external pump between the Calibrator and
the pressure switch. The polarity of the terminals does
not matter.
Note
If using an external pump, connect the pump to
the Calibrator and to the input of the switch using
a tee fitting.
2. Make sure the vent on the pump is open and zero the
Calibrator if necessary. Close the vent after zeroing
the Calibrator.
3. Press Sto enter pressure switch test mode. The
Calibrator will display CLOSE instead of a mA
measurement.
4. Apply pressure with the pump slowly until the switch
opens.
Note
In the switch test mode, the display update rate is
increased to help capture changing pressure
inputs. Even with the enhanced sample rate,
pressuring the device under test should be done
slowly to ensure accurate readings.
5. OPEN is displayed once the switch is open. Bleed the
pump slowly until the pressure switch closes. RCL
appears on the display.
6. Press Sto read the pressure values for when the
swith opened, for when it closed, and for the
deadband
Hold Sfor 3 seconds to reset Switch Test mode; hold
any other key for 3 seconds to exit.

Pressure Calibrator
Zeroing with Absolute Pressure Modules
9
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 a(Z) to increase or h(Y) to decrease
the Calibrator reading to equal the applied pressure.
3. Release Zto exit the zeroing procedure.
Press the Ubutton to convert to any convenient
measurement display unit.
Pressure/
Vacuum
Switch
Fine
Adjustment
Knob
Internal Pump
Pressure/Vacuum
Release
Control
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
ZERO
HOLD
BAROMETRIC ADJ.
mA
MODE
RANGE O 1 PSI
MAX 5 PSI P
-7 O 7 kP
MIN
MAX
SWITCH
TEST
wh009f.eps
Figure 3. Pump Features

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Users Manual
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Table 5. Pump Features
Item Description
Pressure
Vacuum
Switch
Rotate forward (clockwise) for pressure,
backward (counter-clockwise) for
vacuum.
Pressure
Vacuum
Release
Valve
Rotate fully backward (counter-
clockwise) to release all pressure or
vacuum. (Rotate slightly for partial
release.) Rotate fully forward (clockwise)
to close valve.
Fine
Adjustment
Knob
Rotate either direction for precise
adjustment of applied pressure or
vacuum. Full rotation is about 30 turns.
Internal
Pump
Increase pressure on the inward stroke.
In vacuum mode, decrease pressure on
the outward stroke.
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. You can apply pressure with the
Calibrator’s internal pump or with an external pump.
XW Warning
To avoid a violent release of pressure or vacuum,
always depressurize the system slowly using the
pressure/vacuum release control before detaching
any pressure line.
Using the Internal Pump
The internal pump can provide the rated pressure for all
Model 718 Calibrators.
The preferred use for the internal pump is shown in Figure
4, where the Calibrator displays pressure measured with
the internal sensor and provided by the internal pump.
The internal pump can also be used with certain Fluke 700
Series Pressure Modules. In this case, pressure measured
by the Pressure Module is displayed by the Calibrator.
Appropriate pressure modules for each Calibrator model
are identified in Table 6 . Figure 5 shows the internal pump
being used with a pressure module.

Pressure Calibrator
Calibrating a P/I Transmitter
11
XW Warning
If both a pressure module and the internal
sensor are connected, the Calibrator displays
ONLY the pressure module measurement.
To use the Calibrator’s internal pump, refer to Figure 3 and
perform the following steps:
1. Depressurize and drain the line before connecting the
Calibrator.
2. Connect the pressure transmitter to the Calibrator
internal sensor as shown in Figure 4 (for internal
pressure sensor measurements) or Figure 5 (for
pressure module measurements.)
Note
To avoid leaks, use Teflon tape or similar sealant
on all pressure connections.
3. Make sure the pressure/vacuum switch is in the
desired position. Forward (clockwise) is for pressure;
backward (counter-clockwise) is for vacuum.
4. Turn the pressure/vacuum release control backward
(counter-clockwise) to vent pressure/vacuum from the
pump.
5. Press Zto zero the pressure display.
6. Turn the fine adjustment knob to mid-range.
7. Turn the pressure/vacuum release control forward
(clockwise) to close the release valve.
8. Work the pump handle in and out to apply
incrementally larger pressure/vacuum changes.
Shorten the stroke to apply smaller increments of
pressure/vacuum change.
9. To make very small pressure/vacuum changes, use
the fine adjustment knob.
Note
This knob adjusts a small internal reservoir to
vary the total volume. With larger external
pressure/vacuum volumes, this control will adjust
pressure or vacuum within a smaller range.
10. Depressurize the system before disconnecting the
pressure line.

718 Series
Users Manual
12
mA
MODE
RANGE O 1 PSI
MAX 5 PSI P
-7 O 7 kP
MIN
MAX
SWITCH
TEST
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
SIGNAL
TEST
+–
Red
Black
718
PRESSURE
CALIBRATOR
HOLD
UNITS
ZERO
DAMP
HOLD
LOOP
POWER
BAROMETRIC ADJ.
wh002f.eps
Figure 4. Internal Pressure Sensor with Internal Pump