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

Series 275
Instruction Manual
Granville-Phillips®Mini-Convectron®
Vacuum Gauge Module with
DeviceNetTM Digital Interface
Instruction manual part number 275563
Revision F - November 2016

Instruction Manual
Series 275
This Instruction Manual is for use with Granville-Phillips
Series 275 Convectron Modules with DeviceNet, catalog
numbers 275538 and 275553. A list of catalog numbers for the
entire module and replacement gauges is provided on the
following page.
Granville-Phillips®Mini-Convectron®
Vacuum Gauge Module with
DeviceNetTM Digital Interface
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]
© 2016 MKS Instruments, Inc. 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®Mini-Convectron®Module
with DeviceNetTM Digital Interface
Catalog numbers for Series 275 Mini-Convectron Modules
Mini-Convectron Module with DeviceNet, 2 Digital Setpoints,
and 3-Digit Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275538 - X X - X
Mini-Convectron Module with DeviceNet, 2 Digital Setpoints,
and No Digital Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275553 - X X - X
Sensor Type:
Gold-Plated Tungsten G
Platinum P
Flange/Fitting:
1/8 NPT / 1/2 inch tubulation P
1/4 inch VCR-type female fitting Q
1/2 inch VCR-type female fitting R
NW16KF flange D
NW25KF flange E
NW40KF flange K
1.33 inch (NW16CF) ConFlat-type flange F
2.75 inch (NW35CF) ConFlat-type flange G
Measurement Units:
Torr T
mbar M
pascal P
Replacement Convectron Gauges for the 2 modules listed above:
Gold-plated Tungsten Filament
1/8 NPT / 1/2 inch tubulation 275071
1/4 inch VCR-type female fitting 275185
1/2 inch VCR-type female fitting 275282
3/8 inch VCO-type male fitting 275233
1.33 inch (NW16CF) rotatable ConFlat-type flange 275256
2.75 inch (NW35CF) rotatable ConFlat-type flange 275238
NW16KF flange (welded) 275203
NW25KF flange (welded) 275196
NW40KF flange (welded) 275316
Platinum Filament
“X” represents a variable in the catalog number for the replacement gauges.
275320 - P X
1/8 NPT / 1/2 inch tubulation P
1/4 inch VCR-type female fitting Q
1/2 inch VCR-type female fitting R
3/8 inch VCO-type male fitting D
1.33 inch (NW16CF) rotatable ConFlat-type flange E
2.75 inch (NW35CF) rotatable ConFlat-type flange K
NW16KF flange (welded) F
NW25KF flange (welded) G
NW40KF flange (welded) B
VCO and VCR are registered trademarks of Swagelok Company
Complete Module
Replacement Gauges

5
Series 275 Convectron Module with DeviceNet
Instruction Manual - 275563
Chapter 1 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Safety Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Damage Requiring Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Overpressure Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.4 Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.5 Service Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.6 FCC Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.7 Canadian users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Chapter 2 Introduction/Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 The Mini-Convectron Gauge Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1.1 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 Module Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.3 Convectron Gauge Tube Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 Receiving Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1.1 Damaged Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2 Important Considerations for Installation of the Mini-Convectron Module . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 Mini-Convectron Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3.2 Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.3.3 Gauge Mounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4 I/O Connector Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4.1 Wiring the Process Control Connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.4.2 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.5 Configure the Setpoint Relays for the Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6.1 Atmospheric Pressure Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.6.2 Vacuum Chamber Pressure Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Chapter 4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2 Panel Indicators and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2.1 Module (MOD) LED Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.2.2 DeviceNet Network (NET) LED Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.2.3 Data Rate (Baud Rate) Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.2.4 MAC ID Address Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3 Pre-operational Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.4 Preparing for Pressure Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.5 Gas Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.6 Preparing For Convectron Gauge Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.7 Understanding Convectron Gauge Pressure Measurement In Gases Other Than Nitrogen or Air . . . . . . . 29
4.7.1 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.8 Adjustment of Convectron Gauge Zero and Atmospheric Pressure Indications . . . . . . . . . . . . . . . . . . . . . 38
4.8.1 Calibrate the Vacuum Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.8.2 Calibrate the Atmosphere Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.9 Special Considerations for Convectron Gauge Use Below 10-3 Torr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table of Contents

6
Series 275 Convectron Module with DeviceNet
Instruction Manual - 275563
Chapter 5 DeviceNet Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1 DeviceNet Digital Interface Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.1.1 DeviceNet Protocol and Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.1.2 Configuring Polled I/O Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.1.3 Using Input Polled I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.1.4 DeviceNet Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.1.5 Check Module Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.2 Process Control Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
5.2.1 Get Relay Trip Points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2.2 Get Enable or Disable Status of Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2.3 Get Activation or Deactivation Status of Relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2.4 Get Relay Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.3 DeviceNet Protocol for the Mini-Convectron Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.3.1 Standard Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.3.2 Identity Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
5.3.3 DeviceNet Object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
5.3.4 Connection Object. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
5.3.5 Analog Sensor Object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.3.6 Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
5.4 DeviceNet Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
5.5 DeviceNet Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Chapter 6 Service and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.1 Service Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.2 Grounding Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.3 Damage Requiring Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.4 Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.4.1 Symptoms and Possible Causes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.4.2 Removing a Convectron Gauge from the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.4.3 Open the Mini-Convectron Module for Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
6.4.4 Convectron Gauge Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.4.5 Cleaning a Contaminated Convectron Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.4.6 Replacing a Convectron Gauge Tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
6.4.7 Baking the Vacuum Chamber with the Mini-Convectron Gauge Attached . . . . . . . . . . . . . . . . . . 63

7
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
Chapter 1
1Safety Instructions
1.1 Safety Introduction
BEGIN BY READING THESE IMPORTANT SAFETY INSTRUCTIONS AND NOTES collected here for
your convenience and repeated with additional information at appropriate points in these
instructions.
In these instructions the word “product” refers to the Mini-Convectron Module and all of its approved
parts and accessories.
NOTE: 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 MKS, Granville-Phillips Division 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.
These safety precautions must be observed during all phases of operation, installation, and service
of this product. Failure to comply with these precautions or with specific warnings elsewhere in this
manual violates safety standards of design, manufacture, and intended use of the instrument. MKS
Instruments, Inc. disclaims all liability for the customer's failure to comply with these requirements.
•Read Instructions – Read all safety and operating instructions before operating the product.
•Retain Instructions – Retain the Safety and Operating Instructions for future reference.
•Heed Warnings – Adhere to all warnings on the product and in the operating instructions.
•Follow Instructions – Follow all operating and maintenance instructions.
•Accessories – Do not use accessories not recommended in this manual as they may be hazardous.
These safety alert symbols in this manual or on the Product rear
panel mean possible danger of electric shock or caution − personal
safety or property damage. Read these instructions carefully.
Failure to comply with these instructions may result in serious personal injury,
including death, or property damage.
The service and repair information in this manual is for the use of Qualified
Service Personnel. To avoid shock, do not perform any procedures in this
manual or perform any servicing on this product unless you are qualified to do
so.
To reduce the risk of fire or electric shock, do not expose this product to rain
or moisture.
Objects and Liquid Entry − Never push objects of any kind into this product
through openings as they may touch dangerous voltage points or short out
parts that could result in a fire or electric shock. Be careful not to spill liquid of
any kind onto the products.

1 Safety Instructions
8Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
1.2 Damage Requiring Service
Disconnect the product from all power sources and refer servicing to Qualified Service Personnel
under the following conditions:
a. When any cable or plug is damaged.
b. If any liquid has been spilled onto, or objects have fallen into, the product.
c. If the product has been exposed to rain or water.
d. If the product does not operate normally even if you follow the operating instructions. Adjust
only those controls that are covered by the operation instructions. Improper adjustment of other
controls may result in damage and will often require extensive work by a qualified technician to
restore the product to its normal operation.
e. If the product has been dropped or the enclosure has been damaged.
f. When the product exhibits a distinct change in performance. This indicates a need for service.
Do not substitute parts or modify instrument.
Because of the danger of introducing additional hazards, do not install
substitute parts or perform any unauthorized modification to the product.
Return the product to a service facility designated by Granville−Phillips for
service and repair to ensure that safety features are maintained. Do not use this
product if it has unauthorized modifications.
Proper Grounding:
All components of a vacuum system used with this or any similar high voltage
product must be maintained at Earth ground for safe operation. The power
cord of this product shall be connected only to a properly grounded outlet. Be
aware, however, that grounding this product does not guarantee that other
components of the vacuum system are maintained at Earth ground.
Complying with the usual warning to connect the power cable only to a properly
grounded outlet is necessary but not sufficient for safe operation of a vacuum
system with this or any similar high voltage producing product.
Verify that the vacuum port to which the Mini−Convectron Gauge is mounted
is electrically grounded. It is essential for personnel safety as well as proper
operation that the envelope of the gauge be connected to a facility ground. Use
a ground lug on a flange bolt if necessary.
Replacement Parts − When replacement parts are required, be certain to use
the replacement parts that are specified by Granville−Phillips or that have the
same characteristics as the original parts. Unauthorized substitutions may
result in fire, electric shock or other hazards.
Safety Check − Upon completion of any service or repairs to this product, ask
the Qualified Service Person to perform safety checks to determine that the
product is in safe operating order.

1 SafetyInstructions
9
Series 275 Mini-Convectron Module with DeviceNet
Instruction Manual - 275563
1.3 Overpressure Conditions
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.
A pressure relief valve should be installed in the system if the possibility of exceeding 1000 Torr
(1333 mbar, 133 kPa, 19 psi) exists.
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 product.
In addition, ensure that:
a. The proper gas cylinders are installed,
b. Gas cylinder valve positions are correct on manual systems, and
c. The automation is correct on automated gas delivery systemsVacuum gauges with compression
fittings may be forcefully ejected if the vacuum system is pressurized.
Be aware that when high voltage is present in any vacuum system, a
life threatening electrical shock hazard may exist unless all exposed
conductors are maintained at Earth ground.
This hazard is not peculiar to this product.
Be aware that an electrical discharge through a gas may couple dangerous
high voltage directly to an ungrounded conductor almost as effectively as
would a copper wire connection. A person may be seriously injured or even
killed by merely touching an exposed ungrounded conductor at high potential.
This hazard is not unique to this product.
Install suitable devices that will limit the pressure to the level that the vacuum
system can safely withstand. In addition, install suitable pressure relief valves
or rupture disks that will release pressure at a level considerably below the
pressure that the system can safely withstand.
Series 275 Gauges should not be used above 1000 Torr (1333 mbar, 133 kPa, 19
psi) true pressure.
If accurate conversion data is not used, or is improperly used, a potential
overpressure explosion hazard can be created under certain conditions.
Using the N2calibration 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 Chapter 4, Operation, before using with other
gases.

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It is the installer's responsibility to ensure that the automatic signals provided by the product are
always used in a safe manner. Carefully check manual operation of the system and the set point
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.
1.4 Warranty Information
MKS Instruments, Inc. provides an eighteen (18) month warranty from the date of shipment for new
Granville-Phillips Products. The MKS, Granville-Phillips Division General Terms and Conditions of
Sale provides the complete and exclusive warranty for Granville-Phillips products. This document
may be located on our web site at www.mksinst.com, or may be obtained by contacting an MKS,
Granville-Phillips Customer Service Representative.
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.

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1.5 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. Granville-Phillips will supply return packaging materials at no charge upon request.
Shipping damage on returned products as a result of inadequate packaging is the Buyer's
responsibility.
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]
1.6 FCC Verification
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with this instruction manual, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. Operation
of this equipment in a residential area is likely to cause harmful interference in which case the user
will be required to correct the interference at his own expense. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio or television technician for help.

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1.7 Canadian users
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numerique de la classe B respecte toutes les exigences du Reglement sur le material
broilleur du Canada.

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Chapter 2
2Introduction/Specifications
2.1 The Mini-Convectron Gauge Module
Unlike traditional thermocouple and Pirani gauges, Convectron gauges take advantage of heat loss
due to convection cooling at higher pressures. This extends the range of accurate, repeatable
vacuum measurements from less than 1 x 10-4 Torr to 1000 Torr (atmosphere) N2or air.
The Mini-Convectron module is a self-contained measurement device incorporating Convectron
gauge technology and electronics in a compact modular design. The electronics and gauge are
packaged in an all-metal package that provides a rugged enclosure and a high level of immunity to
electrical noise. The Convectron gauge used in the module is field-replaceable.
The Mini-Convectron module is available in a variety of output configurations. This instruction
manual is for use with a Mini-Convectron Module with DeviceNet interface and two
pressure-threshold setpoint relays. The adjustable setpoints allow control of valves, switches, alarm
signals, or other controls.
This instruction manual covers Mini-Convectron Modules with, and without, digital displays.
(275538 = module with digital display; 275553 = module without digital display.)
Within this manual:
• The term “Module” refers to the entire Mini-Convectron Module.
• The term “Gauge” refers to the replaceable Convectron Gauge inside the module.
2.1.1 General Precautions
• Do not use the Mini-Convectron Module in an area of high vibration or extreme shock.
• Do not use the Mini-Convectron Module to measure pressures of explosive gases.
• Always be sure that the Mini-Convectron Module and all components of the vacuum system are
properly grounded.
Figure 2-1 Mini-Convectron Module with DeviceNet Interface

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Table 2-1 Specifications
Function Description
Measuring range for Air or N2
(See Chapter 6 of this instruction
manual for correction curves for other
gases.)
1 x 1x10-4 to 1000 Torr
Operation in the range of 1x10–4 to 1x10-3 Torr will require periodic
verification of the zero by reducing system pressure to below 1 x
10–5 Torr
1 x 10–4 to 1300 mBar
1 x 10–2 to 130 KPa
Resolution 1 x 10-4 Torr; 1 x 10–4 mBar; 1 x 10–2 pascal
Mounting position Horizontal preferred
Power required +11.5 Vdc to 26.5 Vdc
5.5 watts maximum
Protected against reversals, transients or over-voltages
IP Rating IP20
Digital interface DeviceNet
Baud rate 125K, 250K, or 500K, switch selectable
Setpoint Relays Single pole, double throw relay, silver alloy - gold clad contacts
UL rating: 1 A at 30 Vdc, resistive load or AC non-inductive
Connectors 5-pin Micro
9-pin D male
Ambient operating temperature range 0 °C to +40 °C (non-condensing)
Non-operating temperature range -40 °C to +70 °C
Bakeout temperature range with
electronics module attached
(non-operating)
85 °C max.
Package Aluminum extrusion design with aluminum end plates
4.5” long x 1.7” wide x 2.5” high plus gauge port and fitting
Weight 340gm (12 oz) with 1/8 NPT fitting
Gauge tube internal volume 40 cc (2.5 cu in.)
Sensor wire Platinum or Gold-plated Tungsten
Gauge tube replacement Field replaceable using a #1 Phillips screwdriver and a 3/16" nut
driver or socket
Table 2-2 Gauge Powered by DeviceNet
Input Voltage Surge Current Operating Current Pin Connection
26 Vdc 1.5 A, 8 ms 0.2 A Pin 2 = +Vdc
Pin 3 = -Vdc
11 Vdc 2.5 A, 8 ms 0.5 A Pin 2 = +Vdc
Pin 3 = -Vdc

2 Introduction/Specifications
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2.2 Module Dimensions
Figure 2-2 DeviceNet Mini-Convectron Module Dimensions
Table 2-3 Fitting/Flange Dimensions
Fitting Description Dimension H
1/8 NPT pipe thread
1/2 inch compression fitting
1/8 NPT pipe thread /
1/2 inch tubulation
2.2 cm (0.9 in.)
VCR-type female fitting 1/4 inch VCR-type female
fitting (standard)
1/2 inch VCR-type female
fitting
3.0 cm (1.2 in.)
3.9 cm (1.5 in.)
ConFlat-type flange 1.33 inch (NW16CF)
ConFlat-type
2.75 inch (NW35CF)
ConFlat-type
3.9 cm (1.5 in.)
3.9 cm (1.5 in.)
KF flange NW16KF flange
NW25KF flange
NW40KF flange
3.1 cm (1.2 in.)
3.1 cm (1.2 in.)
3.9 cm (1.5 in.)

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2.3 Convectron Gauge Tube Construction
The transducer is a convection enhanced Pirani gauge providing rapid response, six-decades of
pressure transduction, stable calibration, and good accuracy. The Pirani sensing element, R1 of the
schematic of Figure 2-3, is one leg of a Wheatstone Bridge. A temperature compensating network,
R2, forms the second leg of the bridge. The temperature sensitive component of this network is
mounted inside the gauge tube envelope with the sensor. All other resistors of the bridge are
mounted upon the exterior electrical feed through pins of the gauge tube. Pin 4 serves as an electrical
terminal for construction of the compensating network, R2, but no connection is made from the
controller.
All materials are compatible for ultra high vacuum service, corrosion resistance and bakeability to
150 °C. The gauge tube envelope is type 304 stainless steel. All metallic joints in the envelope are
welded. No solder is used within the envelope. The following materials are exposed to the vacuum:
Type 304 stainless steel, Carpenter Alloy 52, Kovar, Kapton®, gold-plated Tungsten (or Platinum) and
borosilicate glass.
Figure 2-3 Convectron Gauge Tube Schematic

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Chapter 3
3Installation
3.1 Receiving Inspection
Inspect all material received for shipping damage. Confirm that your shipment includes all material
and options ordered. If materials are missing or damaged, the carrier that made the delivery must be
notified within 15 days of delivery in accordance with Interstate Commerce regulations in order to
file a valid claim with the carrier. Any damaged material including all containers and packing should
be held for carrier inspection. Contact our Customer Service Department, 6450 Dry Creek Parkway,
Longmont, Colorado 80503, phone [phone] if your shipment is not correct for reasons other
than shipping damage.
3.1.1 Damaged Material
Any damaged material, including all containers and packaging, should be held for carrier inspection.
If your shipment is not correct for reasons other than shipping damage, contact our Customer Service
Department, 6450 Dry Creek Parkway, Longmont, Colorado 80503, or telephone [phone].
3.1.1.1 International Shipments
If an airfreight forwarder handles the shipment and their agent delivers the shipment to customs the
claim must be filed with the airfreight forwarder.
If an airfreight forwarder delivers the shipment to a specific airline and the airline delivers the
shipment to customs the claim must be filed with the airline, not the freight forwarder.
3.2 Important Considerations for Installation of the Mini-Convectron Module
• It is recommended that the Mini-Convectron be installed with the port oriented vertically
downward to ensure that no system condensates or other liquids collect in the gauge tube. The
gauge tube axis must be horizontal if it is to be used at pressures above 1 Torr. Although the gauge
tube will read correctly below 1 Torr when mounted in any position, erroneous readings will
result at pressures above 1 Torr if the gauge tube axis is not horizontal.
• Do not use a compression mount (quick connect) for attaching the Mini-Convectron to the
system in applications resulting in positive pressures in the gauge tube. Positive pressures might
blow the gauge tube out of a compression fitting and damage equipment and injure personnel.
Pipe thread or flange mounting systems should be used for positive pressure applications. In any
case, the absolute pressure in the gauge tube should not exceed 1000 Torr.
• Do not perform electrical continuity tests on the Mini-Convectron gauge tube with instruments
applying voltages in excess of 1 volt when the gauge tube is at vacuum, or 5 volts when at
atmospheric pressure. Exceeding these voltages will damage the sensing element.
• Keep the gauge tube clean. Do not remove the mounting port cover until you are ready to install
the gauge tube.
• Do not mount the Mini-Convectron in a manner that allows deposition of process vapors onto
the internal surfaces of the gauge tube through line-of-sight access to the interior of the gauge
tube.
• Do not install the Mini-Convectron where high amplitudes of vibration are present. Excessive
vibration will cause forced convection at high pressure giving erroneous readings.
• Do not bake the Mini-Convectron Module at temperatures exceeding 85 °C.

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• Do not install the Mini-Convectron where it will be subject to corrosive gases such as mercury
vapor or fluorine which will attack the gold plated sensor.
• Do not use the Mini-Convectron to measure pressures of explosive gases.
• For greatest accuracy and repeatability the Mini-Convectron should be located in a stable room
temperature environment.
• All connections to the unit are to be made with shielded cable or cables. The shield or shields
are to be connected to the connector shell.
3.3 Mini-Convectron Module Installation
Before installing the Mini-Convectron 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 can be located via an internet search or the Thomas
Register under “Valves, Relief” and “Discs, Rupture."
Dimensions of the Mini-Convectron Module are given in Figure 2-2 on page 15.
Cleanliness pays. Keep the port cover in place until moments before installation.
For proper operation above about 1 Torr, install Mini-Convectron Modules with the gauge axis
horizontal. See Figure 3-1. Although the gauge will read correctly below 1 Torr when mounted in
any position, erroneous readings will result at pressures above 1 Torr if the gauge axis is not
horizontal.
Orient the gauge to prevent condensation of process vapors on the internal surfaces through
line-of-sight access to its interior. If vapor condensation is likely, orient the port downward to help
liquids drain out of the gauge.
Vibration causes convection cooling of the sensor and will result in high pressure readings. Mount
Mini-Convectron Module where it will not vibrate excessively.
Operating the module above 1000 Torr (1333 mbar, 133 kPa) true
pressure could cause pressure measurement error or product failure.
Install suitable devices that will limit the pressure to the level that the
vacuum system can safely withstand. In addition, install suitable pressure
relief valves or rupture disks that will release pressure at a level
considerably below the pressure that the system can safely withstand.
Figure 3-1 Recommended Convectron Gauge Orientation

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3.3.1 Environment
To minimize temperature effects, locate pressure gauges away from internal and external heat
sources, in an area where the ambient temperature is reasonably constant.
3.3.2 Location
Where you mount the Mini-Convectron Module is critical to obtaining reliable pressure
measurements. Long tubing or other constrictions can cause large errors in pressure readings. If the
gauge is mounted near the pump, the pressure in the gauge may be considerably lower than in the
rest of the system. If the gauge is mounted near a gas inlet or other source of contamination, the
pressure in the gauge may be much higher than in the rest of the system.
3.3.3 Gauge Mounts
Dimensions of the Mini-Convectron Module and the flange fittings are given in Section 2.2 on page
15.
3.3.3.1 Compression Mount/Quick Connect
Do not use for positive pressure applications. The gauge may be forcefully ejected. The gauge port
is designed to fit a standard 1/2 in. compression/quick connect mounting such as an Ultra-Torr fitting.
Insert the gauge tube port into the compression fitting and finger-tighten the press ring. A light film
of vacuum grease, such as Apiezon®, will ensure sealing.
3.3.3.2 1/8 NPT Mount
Fits standard 1/8 NPT female fitting. Wrap the threads of the gauge port with thread seal tape and
hand tighten. Do not use a wrench or tool. Tighten only enough to achieve a seal.
3.3.3.3 NW or Flange Mount
The KF mounting system requires O-rings and centering rings between mating flanges. Tightening
the wing nut will hold the flanges and the aluminum flange clamp together. Maximum pressure for
this style of mounting system is 1000 Torr absolute.
3.3.3.4 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, do
not use nonmetal gaskets.
Finger tighten all bolts. Use a wrench to continue tightening 1/8turn at a time in crisscross order, e.g.,
1, 4, 2, 5, 3, 6, 4 until all flanges are in contact. After contact, further tighten each bolt about 1/16 turn.
3.4 I/O Connector Wiring
Cables for connecting the Mini-Convectron to the vacuum system are user supplied. Power to the
module is provided through the DeviceNet connector - see Figure 3-2. The DeviceNet interface
requires a 121 ohm terminating resistor to be installed at each end of the trunk as specified in the
DeviceNet Volume 1, Release 1.2, Section 9.3.4.
Connect the required wiring from the vacuum system to the Mini-Convectron Module.

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3.4.1 Wiring the Process Control Connector
Figure 3-2 DeviceNet Micro Connector
Table 3-1 DeviceNet Micro Connector Power Requirements
Input Voltage Surge Current Operating Current Pin Connection
26 Vdc 1.5 A, 8 ms 0.2 A Pin 2 = +Vdc
Pin 3 = -Vdc
11.5 Vdc 2.5 A, 8 ms 0.5 A Pin 2 = +Vdc
Pin 3 = -Vdc
Figure 3-3 Series 275 DeviceNet Mini-Convectron
Process Control Relay Connector
Table 3-2 Maximum Cable Length Relative to
Baud Rate Switch Settings
Maximum Cable Length Baud Rate Setting
500 meters 125 K
250 meters 250 K
100 meters 500 K (default)