Fluke 718 30G User manual

®
718 30G/100G
Pressure Calibrator
Users Manual
July 1998 Rev. 2, 1/01
© 1998, 2000, 2001 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
Zeroing with Absolute Pressure Modules...................................................................... 8
Calibrating a P/I Transmitter.......................................................................................... 9
Using the Internal Pump........................................................................................... 9
Using an External Pump........................................................................................... 14
External Fluke Pressure Module Compatibility.............................................................. 16
Sourcing Loop Voltage.................................................................................................. 17
Maintenance.................................................................................................................. 17
In Case of Difficulty................................................................................................... 18
Cleaning ................................................................................................................... 18
Calibration ................................................................................................................ 18
Replacing the Batteries ............................................................................................ 19
Replacing the Fuse................................................................................................... 20
Parts and Accessories................................................................................................... 21
Specifications................................................................................................................ 24

718 30G/100G
Users Manual
ii
Pressure Sensor Input, 718 30G............................................................................... 24
Pressure Sensor Input, 718 100G............................................................................. 24
Pressure Module Input, 718 30G and 718 100G ...................................................... 24
DC mA Input, 718 30G and 718 100G...................................................................... 24
Loop Supply 718 30G and 718 100G........................................................................ 24
General Specifications.............................................................................................. 25
How to Contact Fluke..................................................................................................... 26

iii
List of Tables
Table Title Page
1. Pressure Sensor Range and Resolution............................................................................ 2
2. Safety Information.............................................................................................................. 3
3. International Electrical Symbols......................................................................................... 5
4. Pushbutton Functions ........................................................................................................ 7
5. Pump Features................................................................................................................... 9
6. Recommended Pressure Modules..................................................................................... 13
7. Fluke Pressure Module Compatibility................................................................................. 16
8. Replacement Parts.............................................................................................................21

718 30G/100G
Users Manual
iv

v
List of Figures
Figure Title Page
1. Connection Technique....................................................................................................... 5
2. Front Panel Features ......................................................................................................... 6
3. Pump Features................................................................................................................... 8
4. Internal Pressure Sensor with Internal Pump..................................................................... 11
5. Pressure Module with Internal Pump................................................................................. 12
6. Pressure Module with External Pump................................................................................ 15
7. Sourcing Loop Voltage....................................................................................................... 17
8. Battery Replacement.......................................................................................................... 19
9. Fuse Replacement............................................................................................................. 20
10. Replacement Parts............................................................................................................. 23

718 30G/100G
Users Manual
vi

1
Pressure Calibrator
Introduction
The Fluke Model 718 30G and 718 100G Pressure
Calibrators (hereafter called “Calibrator”) can 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.
•Measure current up to 24 mA.
•Simultaneously display pressure and current
measurements.
•Supply loop voltage.
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 pressure sensor input is as follows:
•Model 718 30G: 30 psi (206.85 kPa, 2.0685 bar).
“OL” appears at 33 psi.
•Model 718 100G: 100 psi (689.5 kPa, 6.895 bar).
“OL” appears at 120 psi.
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, and this manual.
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 “Parts and Accessories.”

718 30G/100G
Users Manual
2
Table 1. Pressure Sensor Range and Resolution
Displayed
Pressure
Units
Model 718 30G Range
and Resolution Model 718 100G Range and
Resolution
psi -12.000 to 30.000 psi -12.00 to 100.00 psi
inH2O at
4°C-332.16 to 830.40 inH2O-332.2 to 2768.0
inH2O
inH2O at
20°C-332.75 to 831.87 inH2O-332.8 to 2772.9
inH2O
cmH2O at
4°C-843.6 to 2109.0 cmH2O-843.6 to 7030.0
cmH2O
cmH2O at
20°C-845.2 to 2113.0 cmH2O-845.2 to 7043.0
cmH2O
bar -0.8274 to 2.0685 bar -0.8274 to 6.8950 bar
mbar -827.4 to 2068.5 mbar -827.4 to 6895.0 mbar
kPa -82.74 to 206.85 kPa -82.74 to 689.50 kPa
inHg -24.432 to 61.080 inHg -24.43 to 203.60 inHg
mmHg -620.6 to 1551.4
mmHg -620.6 to 5171.5 mmHg
kg/cm2-0.8437 to 2.1090
kg/cm2-0.8437 to 7.0306 kg/cm2
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.

Safety Information
3
Table 2. Safety Information
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 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.

718 30G/100G
Users Manual
4
Table 2. Safety Information (cont.)
WWarning
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 overpressure damage, do not apply pressure to the internal pressure sensor input that exceeds
the following:
•Model 718 30G: 30.000 psi, 206.85 kPa, or 2.0685 bar. “OL” appears at 33 psi.
•Model 718 100G: 100.00 psi, 689.5 kPa, or 6.895 bar. “OL” appears at 120 psi.
To avoid corrosion in the pressure sensor, use the Calibrator only with media compatible with glass,
ceramic, silicon, RTV, nitrile (Buna -N), type 303 stainless steel, and nickel.
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. Use of the optional Fluke
700-ILF In-Line Filter may help isolate the pump from contaminates.

Safety Information
5
Hold in
fixed
position
wh001f.eps
Figure 1. Connection Technique
Table 3. International Electrical 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 relevant European Union
directives
fPressure

718 30G/100G
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. The current inputs
are fused with a 0.125 A, 250 V fast fuse (Littelfusetype
2AG).
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.
Current mA
measurement
Pressure
measurement
Pressure
module input
Pressure
sensor input
Current
input
On/Off Button
718
PRESSURE
CALIBRATOR
HOLD
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
90psi 620kPa
MAX
UNITS
ZERO
DAMP
MIN CLR
MAX HOLD
LOOP
POWER
BAROMETRIC ADJ.
wh005f.eps
Figure 2. Front Panel Features

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.
DTurns pressure reading damping on and off. With damping on, the Calibrator averages several
measurements before displaying a reading.
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 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 since power was turned on or c
was pressed.
hPress hto freeze the display. The gsymbol appears on the display. Press hagain to resume
normal operation.

718 30G/100G
Users Manual
8
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.
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
90psi 620kPa
MAX
ZERO
MIN CLR
MAX HOLD
BAROMETRIC ADJ.
wh009f.eps
Figure 3. Pump Features

Calibrating a P/I Transmitter
9
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. An
internal relief valve activates when pressure/vacuum
exceeds the rating for the Calibrator model (50-60 psi for
718 30G, 140-150 psi for 718 100G.)
WWarning
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 30 psi (2.0685 bar) for
Model 718 30G or 100 psi (6.895 bar) for Model 718
100G.
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

718 30G/100G
Users Manual
10
calibrator model are identified in Table . Figure 5 shows
the internal pump being used with a pressure module.
WWarning
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 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.

Calibrating a P/I Transmitter
11
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
90psi 620kPa
MAX
SIGNAL
TEST
+–
Red
Black
718
PRESSURE
CALIBRATOR
HOLD
UNITS
ZERO
DAMP
MIN CLR
MAX HOLD
LOOP
POWER
BAROMETRIC ADJ.
wh002f.eps
Figure 4. Internal Pressure Sensor with Internal Pump

718 30G/100G
Users Manual
12
COM
mA
30V
MAX
0-30psi 0-206kPa
RANGE
90psi 620kPa
MAX
UNITS
ZERO
DAMP
MIN CLR
MAX HOLD
LOOP
POWER
BAROMETRIC ADJ.
SIGNAL
TEST
+–
Pressure Module
Red
Black
718
PRESSURE
CALIBRATOR
HOLD
wh010f.eps
Figure 5. Pressure Module with Internal Pump