MKS Granville-Phillips Mini-Convectron 275... User manual

Granville-Phillips®Series 275 Mini-Convectron®
Vacuum Gauge Module with Linear Analog Output
Instruction Manual
Instruction manual part number 275539
Revision G - November 2016
Series 275
Instruction Manual

Series 275 Mini-Convectron Module with both linear and non-linear
analog output, no setpoint relays, and no digital display panel.
0 to 1 Torr linear analog output (0 to 10 Vdc)
1 mTorr to 1000 Torr nonlinear analog output (0.375 to 5.659 Vdc).

This Instruction Manual is for use with all Granville-Phillips Series
275 Mini-Convectron Vacuum Gauge Modules with Linear Analog
Output. A list of applicable catalog numbers is provided on the
following page.
The 275330 product is RoHS Compliant.
Series 275
© 2016 MKS Instruments. All rights reserved.
Granville-Phillips®and Convectron®are registered trademarks, and mksinstTM is a trademark
of MKS Instruments, Inc. All other trademarks and registered trademarks are the properties of
their respective owners.
Granville-Phillips®Series 275 Mini-Convectron®
Vacuum Gauge Module with Linear Analog Output
Instruction Manual
Customer Service / Technical Support:
MKS Pressure and Vacuum Measurement Solutions
MKS Instruments, Inc., Granville-Phillips® Division
6450 Dry Creek Parkway
Longmont, Colorado 80503 U.S.A.
Tel: [phone]
Fax: [phone]
Email: [email protected]
MKS Corporate Headquarters
MKS Instruments, Inc.
2 Tech Drive, Suite 201
Andover, MA 01810
Tel: [phone]
Fax: [phone]
Email: [email protected]

Catalog numbers for Series 275 Mini-Convectron Modules
with Linear Analog Output (CE Marked)
Includes a 9-pin D subminiature electrical connector. Operating power: 13.6 Vdc to 26.5 Vdc.
The 27585X series Mini-Convectron Modules have both linear and non-linear analog output,
no setpoint relays, and no digital display panel.
The 275330-XX series Mini-Convectron Modules are the same as the 27585X series, and are also
RoHS compliant.
0 to 1 Torr linear analog output (0 to 10 Vdc) and 1 mTorr to 1000 Torr nonlinear analog output
(0.375 to 5.659 Vdc).
Mini-Convectron Module with: Catalog #
1/8 NPT / 1/2 inch tubulation 275850-EU
1/4 inch VCR-type female fitting 275851-EU
1/2 inch VCR-type female fitting 275862-EU
3/8 inch VCO-type male fitting 275852-EU
1.33 inch (NW16CF) ConFlat-type flange 275853-EU
2.75 inch (NW35CF) ConFlat-type flange 275854-EU
NW10KF flange 275855-EU
NW16KF flange 275856-EU
NW25KF flange 275857-EU
NW40KF flange 275858-EU
NW50KF flange 275859-EU
Tailored Function (20)275580-GQ
Tailored Function (20)275557-EU
Tailored Function (20)275935-XX-X
RoHS Compliant Mini-Convectron Module with: Catalog #
1/8 NPT / 1/2 inch tubulation 275330-GP
1/4 inch VCR-type female fitting 275330-GQ
1/2 inch VCR-type female fitting 275330-GR
3/8 inch VCO-type male fitting 275330-GH
1.33 inch (NW16CF) ConFlat-type flange 275330-GF
2.75 inch (NW35CF) ConFlat-type flange 275330-GG
NW10KF flange 275330-GS
NW16KF flange 275330-GD
NW25KF flange 275330-GE
NW40KF flange 275330-GK
NW50KF flange 275330-GU
VCR & VCO are registered trademarks of Swagelok Company

Mini-Convectron Module Instruction Manual - 275539 5
Table of Contents
Chapter 1 Introduction/Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 About These Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Reading and Following Instructions . . . . . . . . . . . . . . . . . . 7
1.3 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.4 Explosion / Implosion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.5 System Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.7 Service Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.8 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1 Module Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2 Installing Pressure Relief Devices . . . . . . . . . . . . . . . . . . . . 15
2.3 Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Step 1 Location and Orientation of the Module . . . . . . . . . . . . . . . 16
Determine the Best Location for the Module . . . . . . . . . . . . 16
Orientation of the Module . . . . . . . . . . . . . . . . . . . . . . . . . 17
Step 2 Attach the Module to the Vacuum Chamber . . . . . . . . . . . . 18
1/8 NPT pipe thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
VCR type fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
KF flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ConFlat flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Step 3 Assemble and Connect the Power and Interface Wiring . . . 19
Connecting Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Wiring Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Step 4 Calibrate the Convectron Gauge . . . . . . . . . . . . . . . . . . . . . 21
Calibrate at Atmosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Calibrate at Vacuum Chamber Pressure . . . . . . . . . . . . . . . 22
Set the ZERO Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Set the FULL SCALE Adjustment . . . . . . . . . . . . . . . . . . . . . 23
Chapter 3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.1 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.2 Front Panel Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.3 Preparing for Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.4 Nonlinear (Bridge) Analog Output . . . . . . . . . . . . . . . . . . . 27
3.5 Understanding Convectron Gauge Pressure Measurement
In Gases Other Than Nitrogen or Air . . . . . . . . . . . . . . . . . . 28
3.6 Commonly used Gases Other than N2or Air . . . . . . . . . . . . 29
3.7 Bridge Analog Output Voltage . . . . . . . . . . . . . . . . . . . . . . 32
3.8 Linear Analog Output Voltage . . . . . . . . . . . . . . . . . . . . . . . 32
3.9 External Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table of Contents
6Mini-Convectron Module Instruction Manual - 275539
3.10 Modules Operating at Low Pressure . . . . . . . . . . . . . . . . . . 44
Chapter 4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.1 Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Damage Requiring Service . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.2 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Symptoms, Causes, and Solutions . . . . . . . . . . . . . . . . . . . . 47
4.3 Convectron Gauge Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
4.4 Convectron Gauge Removal and Replacement . . . . . . . . . . 49
Removing the Convectron Gauge . . . . . . . . . . . . . . . . . . . . 49
Replacing the Convectron Gauge . . . . . . . . . . . . . . . . . . . . 49
4.5 Returning a Product for Repair . . . . . . . . . . . . . . . . . . . . . . 50
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Mini-Convectron Module Instruction Manual - 275539 7
Introduction/Safety Installation Operation Maintenance
Chapter 1 Introduction/Safety
1.1 About These
Instructions
The instructions in this User Manual explain how to install, operate, and
maintain the Granville-Phillips®Mini-Convectron®vacuum gauge module.
In these instructions the word “product” refers to the Mini-Convectron
Module and all of its approved parts and accessories.
•This chapter explains the caution and warning statements used
throughout the manual which must be adhered to at all times, your
responsibility to read and follow all instructions, how to contact customer
service, and product specifications.
•Chapter 2 explains how to install and connect the module.
•Chapter 3 explains the theory of operation, how to operate the module,
and how to use the module with various gases.
•Chapter 4 explains troubleshooting, Convectron gauge testing, removal
and replacement, and module return-for-repair procedures.
1.2 Reading and Following
Instructions
You must comply with all instructions while you are installing, operating,
or maintaining the module. Failure to comply with the instructions violates
standards of design, manufacture, and intended use of the module.
Granville-Phillips and MKS Instruments, Inc. disclaim all liability for the
customer's failure to comply with the instructions.
•Read instructions – Read all instructions before installing or operating the
product.
•Follow instructions – Follow all installation, operating and maintenance
instructions.
•Retain instructions – Retain the instructions for future reference.
•Heed warnings and cautions – Adhere to all warnings and caution
statements on the product and in these instructions.
Parts and accessories – Install only those replacement parts and accessories
that are recommended by Granville-Phillips. Substitution of parts is
hazardous.
Table 1-1 Terms Describing the Mini-Convectron Module and Components
Term Description
Module The Mini-Convectron vacuum gauge module, which contains a Convectron
convection-enhanced Pirani heat-loss pressure gauge.
Convectron Gauge The Convectron convection-enhanced Pirani heat-loss gauge, which measures
pressure within the vacuum chamber

Chapter 1
8Mini-Convectron Module Instruction Manual - 275539
1.3 Safety Instructions This manual contains caution and warning statements with which you must
comply to prevent inaccurate measurement, property damage, or personal
injury.
NOTES: These instructions do not and cannot provide for every
contingency that may arise in connection with the installation, operation, or
maintenance of this product. If you require further assistance, contact
Granville-Phillips at the address on the title page of this manual.
This product is designed and tested to offer reasonably safe service provided
it is installed, operated, and serviced in strict accordance with these safety
instructions.
Caution and warning statements comply with American Institute of
Standards Z535.1–2002 through Z535.5–2002, which set forth voluntary
practices regarding the content and appearance of safety signs, symbols,
and labels.
Each caution or warning statement explains:
a. The specific hazard that you must prevent or unsafe practice that you
must avoid,
b. The potential result of your failure to prevent the specified hazard or
avoid the unsafe practice, and
c. What you must do to prevent the specified hazardous result.
CAUTION
Caution statements alert you to hazards or unsafe
practices that could result in minor personal injury or
property damage.
Each caution statement explains what you must do to prevent or
avoid the potential result of the specified hazard or unsafe
practice.
WARNING
Warning statements alert you to hazards or unsafe
practices that could result in severe property damage or
personal injury due to electrical shock, fire, or explosion.
Each warning statement explains what you must do to prevent
or avoid the potential result of the specified hazard or unsafe
practice.

Introduction/Safety
Mini-Convectron Module Instruction Manual - 275539 9
Introduction/Safety Installation Operation Maintenance
1.4 Explosion / Implosion
Danger of injury to personnel and damage to equipment exists on all
vacuum systems that incorporate gas sources or involve processes capable
of pressuring the system above the limits it can safely withstand.
For example, danger of explosion in a vacuum system exists during
backfilling from pressurized gas cylinders because many vacuum devices
such as ionization gauge tubes, glass windows, glass belljars, etc., are not
designed to be pressurized.
WARNING
The fumes from solvents such as trichloroethylene,
perchloroethylene, toluene, and acetone can be
dangerous to health if inhaled. Use only in well
ventilated areas exhausted to the outdoors. Acetone and
toluene are highly flammable and should not be used
near an open flame or energized electrical equipment.
WARNING
If used improperly, Mini−Convectron Gauges can
supply misleading pressure indications that can result in
dangerous overpressure conditions within the system.
Do not operate in an explosive atmosphere.
Do not operate the product in the presence of flammable
gases or fumes.
Operation of any electrical instrument in such an
environment constitutes a definite safety hazard.
Do not use the product to measure the pressure of
explosive or combustible gases or gas mixtures. The
sensor wire of the Mini−Convectron Gauge normally
operates at only 125 ˚C, but it is possible that Controller
malfunction can raise the sensor temperature above the
ignition temperature of combustible mixtures.
Danger of explosion or inadvertent venting to
atmosphere exists on all vacuum systems which
incorporate gas sources or involve processes capable of
pressurizing the system above safe limits.

Chapter 1
10 Mini-Convectron Module Instruction Manual - 275539
Series 275 instruments are furnished calibrated for N2. They also measure
the pressure of air correctly within the accuracy of the instrument. Do not
attempt to use a Series 275 Gauge calibrated for N2to measure or control
the pressure of other gases such as argon or CO2, unless accurate
conversion data for N2to the other gas is properly used. See Commonly
Used Gases Other than N2and Air, and Other Gases in the Operation
Chapter.
A pressure relief valve should be installed in the system if the possibility of
exceeding 1000 Torr (1333 mbar) exists.
Do not attach cables to glass gauge pins while the gauge is under vacuum.
Accidental bending of the pins may cause the glass to break and implode.
Cables, once installed, should be secured to the system to provide strain
relief for the gauge tube pins.
Suppliers of pressure relief valves and pressure relief disks can be located
via an online search, and are listed at ThomasNet.com under “Relief
Valves”. Confirm that these safety devices are properly installed before
installing the Mini-Convectron Module.
In addition, check that (1) the proper gas cylinders are installed, (2) gas
cylinder valve positions are correct on manual systems, and (3) the
automation is correct on automated systems.
WARNING
If accurate conversion data is not used, or is improperly
used, a potential overpressure explosion hazard can be
created under certain conditions. Using the N2
calibration to pressurize a vacuum system above about 1
Torr with certain other gases can cause dangerously
high pressures which may cause explosion of the system.
See the Chapter 3 before using with other gases.

Introduction/Safety
Mini-Convectron Module Instruction Manual - 275539 11
Introduction/Safety Installation Operation Maintenance
1.5 System Grounding Grounding, though simple, is very important! Be certain that ground circuits
are correctly used on your ion gauge power supplies, gauges, and vacuum
chambers, regardless of their manufacturer. Safe operation of vacuum
equipment, including the Mini-Convectron Module, requires grounding of
all exposed conductors of the gauges, the controller and the vacuum
system. Lethal Voltages may be established under some operating
conditions unless correct grounding is provided.
Ion producing equipment, such as ionization gauges, mass spectrometers,
sputtering systems, etc., from many manufacturers may, under some
conditions, provide sufficient electrical conduction via a plasma to couple
a high voltage electrode potential to the vacuum chamber. If exposed
conductive parts of the gauge, controller, and chamber are not properly
grounded, they may attain a potential near that of the high voltage electrode
during this coupling. Potential fatal electrical shock could then occur
because of the high voltage between these exposed conductors and ground.
1.6 Operation It is the installer's responsibility to ensure that the automatic signals
provided by the process control module are always used in a safe manner.
Carefully check manual operation of the system and the setpoint
programming before switching to automatic operation. Where an
equipment malfunction could cause a hazardous situation, always provide
for fail-safe operation. As an example, in an automatic backfill operation
where a malfunction might cause high internal pressures, provide an
appropriate pressure relief device.
1.7 Service Guidelines Some minor problems are readily corrected on site. If the product requires
service, contact the MKS, Granville-Phillips Division Technical Support
Department at 1-303-652-4400 or 1-800-776-6543 for troubleshooting
help over the phone.
If the product must be returned to the factory for service, request a Return
Material Authorization (RMA) from Granville-Phillips. Do not return
products without first obtaining an RMA. In some cases a hazardous
materials disclosure form may be required. The MKS/Granville-Phillips
Customer Service Representative will advise you if the hazardous materials
document is required.
When returning products to Granville-Phillips, be sure to package the
products to prevent shipping damage. Shipping damage on returned
products as a result of inadequate packaging is the Buyer's responsibility.

Chapter 1
12 Mini-Convectron Module Instruction Manual - 275539
For Customer Service / Technical Support:
MKS Pressure and Vacuum Measurement Solutions
MKS Instruments, Inc., Granville-Phillips®Division
6450 Dry Creek Parkway
Longmont, Colorado 80503 USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
MKS Corporate Headquarters
MKS Instruments, Inc.
2 Tech Drive, Suite 201
Andover, MA 01810 USA
Tel: [phone]
Fax: [phone]
Email: [email protected]
1.8 Specifications
Pressure Measurement
Measurement Range for Air or N2Torr 1 x 10–4 to 1000
mbar 1 x 10–4 to 1333
Pascal 1 x 10–2 to 1.33 x 105
Resolution Torr 1 x 10–4
mbar 1 x 10–4
Pascal 1 x 10–2
Measurements will change with different gases and mixtures. Do not use
the module with flammable or explosive gases. The module is factory
calibrated for use with Air or N2. It measures the pressure of air correctly
within the specified accuracy of the instrument. If the module will measure
the pressure of a gas other than Air or N2, you must calibrate the
Mini-Convectron Module for the process gas. See Understanding
Convectron Gauge Pressure Measurement In Gases Other Than Nitrogen or
Air in the Operation Chapter.
Temperature Limits
Operating Temperature +0 to +40 °C (+32 to +104 °F) ambient, non-condensing
Non-operating Temperature –40 to +70 °C (–40 to +158 °F)
Power Requirements and Electrical Connections
Power Requirement 13.6 to 26.5 Vdc, 0.1 A at 11.5 Vdc, 1.6 W maximum
Must be protected against reversals, transients, or over-voltages.
I/O Connector 9-pin male, subminiature D

Introduction/Safety
Mini-Convectron Module Instruction Manual - 275539 13
Introduction/Safety Installation Operation Maintenance
Analog Outputs
Analog Output Bridge Output:
0.375 to +5.659 Vdc for 0 to 1000 Torr of N2, non-linear
0 to 1333 mbar of N2, non-linear
0 to 1.33 x10–1 kPa of N2, non-linear
Linear Output:
0.0 to +10 Vdc minimum for 0 to 1000 mTorr of N2(1 Ohm output
impedance)
Mini-Convectron Gauge
Sensing Wire Filament Gold-plated tungsten (standard) or solid platinum (optional)
Internal Volume 40 cc (2.5 cu in.)
Materials Exposed to Vacuum 304 stainless steel, gold, borosilicate glass, kovar, alumina, NiFe alloy,
polyimide
Bakeout Temperature 150 °C (302 °F) maximum, non-operating, with electronics removed
Physical Characteristics
Mounting Position Horizontal axis (see Figure 2-1 on page 17).
Case Material Powder-coated extruded aluminum
Weight 340 g (12 oz.) with 1/8 NPT fitting
Physical Dimensions See Figure 1-1 and Table 1-2
Compliance
EMC EN61326-1
Safety EN61010-1
Environmental RoHS Compliant (275330 Product)
IP Rating IP20

Chapter 1
14 Mini-Convectron Module Instruction Manual - 275539
Figure 1-1 Mini-Convectron Module Physical Dimensions
Table 1-2 Mini-Convectron Vacuum Connections
Vacuum Connections Dim. H
cm in.
1/8 NPT pipe thread, ½-inch inside diameter 2.2 1.0
½-inch 4 VCR®type fitting, female 3.0 1.2
½-inch 8 VCR type fitting, female 3.9 1.5
NW16KF flange 3.1 1.2
NW25KF flange 3.1 1.2
NW40KF flange 3.7 1.5
1.33-inch (NW16CF) ConFlat®flange 3.8 1.5
2.75-inch (NW35CF) ConFlat flange 3.8 1.5

Mini-Convectron Module Instruction Manual - 275539 15
Before You Begin Installation Operation Maintenance
Chapter 2 Installation
2.1 Module Components The Mini-Convectron Module contains a Convectron convection-enhanced
Pirani heat-loss gauge.
The module is shipped with an instrument screwdriver and a 9-pin female,
high-density subminiature D connector that mates to the male connector on
the module.
2.2 Installing Pressure Relief
Devices
Before you install the module, install appropriate pressure relief devices in
the vacuum system.
Granville-Phillips does not supply pressure relief valves or rupture disks.
Suppliers of pressure relief valves and rupture disks are listed in the Thomas
Register under “Valves, Relief” and “Discs, Rupture.”
2.3 Installation Procedure The module installation procedure includes the following steps:
1. Determine the best location and orientation for the module.
2. Attach the module vacuum chamber fitting to its mate on the vacuum
chamber.
3. Assemble and connect the module wiring.
4. Calibrate the Convectron gauge at atmospheric and vacuum pressures.
WARNING
Using the module to measure the pressure of flammable
or explosive gases can cause a fire or explosion resulting
in severe property damage or personal injury.
Do not use the Mini−Convectron Module to measure the
pressure of flammable or explosive gases.
CAUTION
Operating the module above 1000 Torr (1333 mbar, 133
kPa) true pressure could cause pressure measurement
error or product failure.
To avoid measurement error or product failure due to
overpressurization, install pressure relief valves or rupture
disks in the system if pressure exceeds 1000 Torr
(1333 mbar, 133 kPa).

Chapter 2
16 Mini-Convectron Module Instruction Manual - 275539
Step 1 Location and Orientation of the Module
Figure 1-1 and Table 1-2 illustrate the physical dimensions of the module
and vacuum fittings.
To locate and orient the module, refer to Figure 2-1, and follow the
instructions below.
Determine the Best
Location for the Module
• For greatest accuracy and repeatability, locate the module in a stable,
room-temperature environment. Ambient temperature should never
exceed 40 °C (104 °F) operating, non-condensing, or 70 °C (158 °F)
non-operating.
• Locate the module away from internal and external heat sources and in
an area where ambient temperature remains reasonably constant.
• Do not locate the module where it requires long lengths of tubing or has
constricted tubing. Length of tubing depends on the application. Longer
tubing will affect vacuum pressure limit and response time.
• Do not locate the module near the pump, where gauge pressure might be
lower than normal vacuum chamber pressure.
• Do not locate the module near a gas inlet or other source of
contamination, where inflow of gas or particulates causes atmospheric
pressure to be higher than system atmosphere.
• Do not locate the module where it will be exposed to corrosive gases
such as mercury vapor or fluorine.
• Do not locate the module where it will vibrate. Vibration causes
convection cooling, resulting in inaccurate high pressure readings.
WARNING
Failure to use accurate pressure conversion data for N2
or air to other gases can cause an explosion due to
overpressurization.
If the module will measure any gas other than N2or air,
before putting the module into operation, adjust the
setpoint relays for the process gas that will be used.

Installation
Mini-Convectron Module Instruction Manual - 275539 17
Before You Begin Installation Operation Maintenance
Orientation of the Module For proper operation of the module above 1 Torr, orient the module so the
axis is horizontal (see Figure 2-1). Although the Convectron gauge will read
correctly below 1 Torr with the module mounted in any position, inaccurate
readings will result at pressures above 1 Torr if the module axis is not
horizontal.
Figure 2-1 Module Orientation
Mount the Module Axis Horizontally to Ensure
Accurate Measurement Above 1 Torr
Vacuum chamber
Vacuum chamber
Vacuum chamberVacuum chamber
Vacuumchamber
Vacuum
Vacuum
Recommended Not recommended

Chapter 2
18 Mini-Convectron Module Instruction Manual - 275539
Step 2 Attach the Module to the Vacuum Chamber
Attach the module vacuum chamber fitting to its mate on the vacuum
chamber.
1/8 NPT pipe thread The 1/8 NPT pipe thread accommodates a standard 1/8 NPT female fitting.
a. Wrap the threads of the port to the vacuum chamber with thread
sealant tape.
b. Tighten the module just enough to achieve a seal.
VCR type fitting VCR-type fitting
a. Remove the plastic or metal bead protector cap from the fitting.
b. If a gasket is used, place the gasket into the female nut.
c. Assemble the components and tighten them to finger-tight.
d. While holding a back-up wrench stationary, tighten the female nut
1/8 turn past finger-tight on 316 stainless steel or nickel gaskets, or 1/4
turn past finger-tight on copper or aluminum gaskets.
KF flange The KF mounting system requires O-rings and centering rings between
mating flanges.
a. Tighten the clamp to compress the mating flanges together.
b. Seal the O-ring.
CAUTION
Twisting the module to tighten the fitting to the vacuum
chamber can damage the module’s internal connections.
• Do not twist the module to tighten the fitting.
• Use appropriate tools to tighten the fitting.
CAUTION
Do NOT use Compression mount/Quick connect fittings
for positive pressure applications. The gauge may be
forcefully ejected.

Installation
Mini-Convectron Module Instruction Manual - 275539 19
Before You Begin Installation Operation Maintenance
ConFlat flange To minimize the possibility of leaks with ConFlat flanges, use high strength
stainless steel bolts and a new, clean OFHC copper gasket. Avoid
scratching the seal surfaces. To avoid contamination, install metal gaskets.
a. Finger tighten all bolts.
b. Use a wrench to continue tightening 1/8 turn at a time in crisscross
order until flange faces make contact.
c. Further tighten each bolt about 1/16 turn.
Step 3 Assemble and Connect the Power and Interface Wiring
Connecting Cable The cable is user-supplied. Granville-Phillips does not supply the cable.
Install externally shielded cable and connect the shield at both ends.
At the module end of the cable, connect the shield to the outer shell of the
subminiature D connector.
Connect the 13.6 to 26.5 Vdc power supply to pins #3 and #4.
• Pin 3 (input) is positive (+).
• Pin 4 (ground) is negative (–).
NOTE: The Mini-Convectron Module is ON anytime input power is applied
to the module. When power is ON, the sensor wire in the Convectron gauge
operates at approximately 110 °C.
See Figure 3-3 for information on pins 1 and 2 for the external calibration
function.
Ground the gauge to the vacuum chamber/facility ground point as
explained in Grounding, beginning on page 20.
Wiring Terminals Figure 2-2 illustrates the 9-pin D subminiature wiring terminals for the
module.
Figure 2-2 9-Pin I/O and Power Connector

Chapter 2
20 Mini-Convectron Module Instruction Manual - 275539
Grounding
If the fitting allows continuous metal-to-metal contact between the housing
base and the vacuum chamber, the module is properly grounded via the
fitting. If the fitting requires a rubber gasket, rubber O-ring, Teflon tape, or
other material that prevents metal-to-metal contact between the housing
base and the vacuum chamber, refer to Figure 2-3 and follow these
instructions to ground the module to the vacuum chamber:
a. Attach a metal hose clamp or other metal clamp to the gauge stem of
the housing.
b. Install a 3.31 mm2(12 AWG) or larger copper wire between the
clamp and a metal ground lug, bolt, or stud on the vacuum chamber.
Figure 2-3 Ground Connection to the Vacuum Chamber
WARNING
Improper grounding could cause product failure,
property damage, or serious personal injury.
To reduce the risk of product failure, property damage, or
serious personal injury, follow ground network requirements
for the facility.
• Maintain all exposed conductors at earth ground.
• Ground the gauge to the vacuum chamber.
• Make sure the vacuum port to which the module is mounted
is properly grounded.
Metal hose clamp or other metal clamp
3.00 mm2(12 AWG) or larger ground wire
Fitting
Vacuum Chamber
Ground lug, bolt, or stud
Gauge stem