Instrutech VGC301 Manuale utente

InstruTech, Inc.

VGC-301

Vacuum Gauge Controller

User’s Manual

Revision: 1.05

March 20, 2009

1475 S. Fordham St.

Longmont, CO 80503

Phone 303-651-0551

Fax 303-678-1754

E-mail [email protected]

www.instrutechinc.com

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 2

Table of Contents

page

Introduction / General Information

Description 3

Specifications 3

Options & Accessories 3

Safety

General 4

Service and Operation 4

Electrical 4

Overpressure 4

Gases other than N25

Flammable/Explosive Gases 5

Installation

Mounting 6

Electrical Connections 7

Setup & Operation

User Interface Basics 9

Menu Item Explanations 9

Calibration 10

Interface

RS-485/RS-232 Commands 11

Service

Maintenance 12

Cleaning 12

Troubleshooting 12

Factory Default Reset 13

Factory Service and Support 13

Trademarks & Acknowledgements 13

Appendices

A. User interface map 14

B. Using thermal vacuum gauges with different gases 16

C. Vacuum gauge contamination & cleaning 23

Warranty 26

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 3

Introduction / General Information

Description

The VGC-301 vacuum gauge controller is a convenient and

inexpensive power supply and readout instrument for a CVG

"Worker Bee" convection vacuum gauge. The 1/8-DIN

housing can be used on the bench top or mounted in a cutout

in an instrument panel. The VGC-301 is powered by 12-30

VDC, or by its self-contained universal 100-240VAC supply.

Compatibility: Signals and relay functions are the same

as found on similar convection gauge controllers from

other manufacturers. The VGC-301, CVG gauge, and

gauge cable can be directly interchanged with Granville-

Phillips 375 Controller, 275 Convectron®gauge, and

gauge cable. (Remote interface, relay, and power

connectors are different.)

Specifications

measurement range

1x10-4 to 1000 Torr

1x10-4 to 1333 mbar

1x10-2 Pa to 133 kPa

resolution 1x10-4 Torr / 1x10-4 mbar / 1x10-2 Pa

display Four-digit LCD, displays 4 digits from 1100 Torr to 1000 Torr

3 digits from 999 Torr to 10.0 mTorr

2 digits from 9.9 mTorr to 1.0 mTorr

1 digit from 0.9 mTorr to 0.1 mTorr

display engineering units Torr, mbar, or Pa - user selectable

display update rate 0.5 sec

weight 250 gm ( 9 oz)

operating temperature 0 to +40 oC ambient

storage temperature -40 to +70 oC

humidity 0 to 95% RH non-condensing

analog output (user-selectable)

a) non-linear S-curve 0.375 to 5.659 Vdc, or

b) linear 0 to 10 Vdc, user scalable (default is 10Vdc = 1 Torr), or

c) log-linear 1 to 8 Vdc, 1V/decade

digital interface RS232 and RS485

housing 1/8-DIN panel-mount enclosure (see outline drawing for dimensions)

input power 100-240 Vac, 50/60Hz, universal power supply or 12-30 Vdc

setpoint relays two single-pole double-throw relays (SPDT)

contact rating 1A at 30 Vdc resistive, or ac non-inductive

trippoint range 1x10-3 to 1000 Torr

adjustment a) adjust value by panel pushbutton up/down keys and display

b) adjust value, direction, and hysteresis by software/interface

connectors

gauge: 9-pin D female

analog output and digital interface: 9-pin D male

relay outputs: 6-pin pluggable terminal block

power: universal AC and 2-pin pluggable terminal block DC

RF/EMI protection CE compliant

Options & Accessories

Gauge Cable - Connects VGC-301 to InstruTech CVG-101 Worker Bee or Helix/GP 275 Convectron®gauge tube

10 ft (3m) CB 421-1- 10F

20 ft (6m) CB 421-1- 20F

50 ft (15m) CB 421-1- 50F

custom lengths over 50 ft (15m), up to 100 ft ( 30 m) CB 421-1 - xxxF or - yyM

Connector Kit - One set of mating connectors is included with the VGC-301: one

AC Cord , one 6-pin pluggable terminal strip connector, and one 2-pin pluggable terminal

strip connector. (Does not include gauge cable connector - part of cable above.) To

order a spare set of connectors separately ... CK-431-xx

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 4

Safety

Instrutech has designed and tested this product to provide safe and reliable service, provided it is installed and

operated within the strict safety guidelines provided in this manual.Please read and follow all warnings and

instructions. Failure to comply with these safety procedures may result in serious bodily harm, including

death, and or property damage. Failure to comply with these warnings violates the safety standards of the

installation and intended use of the instrument. Instrutech, Inc. disclaims all liability for the customer’s failure to

comply with these requirements.

Although every attempt has been made to consider most possible installations, Instrutech cannot anticipate every

contingency that arises from various installations, operation, or maintenance of the module. If you have any

questions about the safe installation and use of this product, please contact Instrutech at the address shown on

page 1 of this manual.

Service and operation

Do not modify this product or substitute any parts without authorization of a qualified Instrutech technician.

Return the product to an Instrutech qualified service and repair center to ensure that all safety features are

maintained. Do not use this product if unauthorized modifications have been made.

After servicing this product, ensure that all safety checks are made by a qualified service person.

Replacement Parts: When replacement parts are required, ensure that the parts are specified by Instrutech Inc.

Unauthorized substitutions or non-qualified parts may result in fire, electric shock, or other hazards.

To reduce the risk of fire or electric shock, do not expose this product to rain or moisture. This product is not

waterproof and careful attention must be paid to not spill any type of liquid onto this product.

Due to the possibility of corrosion under certain environmental conditions, it is possible that the product’s safety

could be compromised over time. It is important that the product be periodically inspected for sound electrical

connections and grounding. Do not use if the grounding or electrical insulation has been compromised.

Electrical conditions:

Danger: 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 applies to all products that come in contact

with the gas.

Danger: An electrical discharge through a gas may couple dangerous high voltage directly to any ungrounded

conductor. A person may be seriously injured or killed by coming in contact with an exposed ungrounded

conductor at a high voltage potential. This applies to all products that may come in contact with the gas.

Proper Grounding: Verify that the vacuum port on which the module is mounted is electrically grounded. This is

essential for safety as well as proper operation. The gauge and/or case of the module must be connected to

earth ground. Use a ground lug on the flange if necessary.

Overpressure:

Warning: Install suitable protective devices that will limit the level of the pressure to less than what the vacuum

system can withstand. InstruTech convection gauges should not be used above 1000 Torr absolute pressure.

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 5

Safety (continued)

Gases other than Nitrogen:

InstruTech gauges are calibrated for N2. Do not attempt to use with other gases such as argon or CO2unless

accurate conversion data for N2to the other gas is properly used. Refer to Appendix B for a more complete

discussion of issues.

Do not use a convection gauge in an explosive atmosphere or in the presence of flammable gases or fumes.

Do not use a convection gauge to measure the pressure of explosive or combustible gases or mixtures. The

sensor wire in the gauge normally operates at 125 C, but under malfunction the wire temperature could exceed

the ignition temperature of combustible mixtures.

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 6

Installation

This manual describes installation of the VGC-301 Controller and connection to the vacuum gauge. For

installation of the vacuum gauge, refer to the instruction manual for your particular gauge.

Installation - Controller Mounting

The VGC-301 was designed for use on a bench top, or mounted in an instrument control panel.

To mount the VGC-301 in a panel:

1. Make a cutout in your instrument control panel as shown in the drawing above. Be sure to allow clearance

behind the panel for the instrument as well as connectors and cables at the rear of the instrument

2. Slip a screwdriver into the slot located

on either side of the front panel bezel, and

pry the bezel off.

3. Slide the VGC-301 into the panel hole

cutout.

4. On either side of the VGC-301 are two

screw-mounting brackets. When the screws

in the front of the instrument are turned

counterclockwise, the hold-down brackets

recess out of the way into the VGC-301

housing. When these screws are turned

clockwise, the brackets rotate out 90obehind

the panel. Tighten these screws until the brackets hold the VGC-301 in place against the panel.

5. Press the bezel back in place on the front of the instrument.

96mm (3.8")

50mm

(1.95")

44mm

(1.75")

92mm (3.62")

45mm

(1.77")

panel

cutout

91mm (3.58")

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 7

Installation - Electrical Connections

Grounding: Be sure the vacuum gauge and the rest of your vacuum system are properly grounded to protect

personnel from shock and injury. Be aware that some vacuum fittings, especially those with O-rings, do not make

a good electrical connection between the gauge and the chamber.

A good recommended practice is to remove power from any cable prior to connecting or disconnecting it.

The InstruTech VGC-301 may replace similar controllers from other manufacturers, such as BOC/Edwards,

Helix/Granville-Phillips, Inficon, MKS Instruments, Varian Vacuum, and others. Many of these employ the same

9- and 15-pin D connectors, but they do not all use the same signal/pinout configurations. If you wish to use your

existing cables, be sure to check compatibility with the tables below, and rewire your cables as necessary.

AC Power Input

Universal AC power cord input plug. The VGC-301 accepts AC power from 100 to 240 VAC, 50/60Hz. The VGC-301

includes a power cord with North America 115 VAC plug on the other end. Consult InstruTech for availability of AC

cords with plugs for other countries.

DC Power Input

Two-pin pluggable terminal strip (Mating connector: Phoenix p/n 1803578 or InstruTech p/n 000327).

pin number pin description

1 +12 to +30 V

2 ground

Note: The VGC-301 will operate from either AC or DC power. It is not necessary to supply both.

1 6 1 2

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 8

Installation - Electrical Connections (continued)

Remote I/O & Interface Connector

Nine-pin D male. (Mating connector: InstruTech p/n 000263 + 000264)

pin number pin description

1 RS485B TX/RX

2 RS485A TX/RX

3 RS485B TX

4 RS485A TX

5 RS232 TX

6 RS232 RX

7 analog signal output (non-linear, linear, or log-linear)

8 signal ground

9 relay disable

Relay Connector

Six-pin pluggable terminal strip (Mating connector: Phoenix p/n1803617 or InstruTech p/n 000347)

pin number pin description

1 relay 1 common

2 relay 1 NC

3 relay 1 NO

4 relay 2 common

5 relay 2 NC

6 relay 2 NO

Gauge Connector

VGC-301 - Nine-pin D female. (Mating connector: InstruTech p/n 000XXX + 000YYY)

CVG Gauge tube - Custom connector (Mating connector: InstruTech p/n 000ZZZ)

VGC-301 pin number connects to CVG gauge pin number

1 NC

2 cable shield

3 3

4 3

5 2

6 5

7 1

8 1

9 NC

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 9

Setup and Operation

User Interface Basics:

The menus within the VGC-301 user interface have been designed for easy operation and a natural progression

of setup parameters. The complete map of the user interface screens is shown in appendix A. The following

sections give a brief explanation of the features for added clarity.

The four buttons to the left and right of the display are the

programming buttons. During programming of the VGC-301,

the display will identify what function each button represents.

To begin programming, press any of the four Programming

Buttons. After setting the various parameters, press the

SAVE/EXIT key to save the new setting and return to the main

screen. To continue setting additional parameters, scroll

forward with the MORE key until you reach the desired

parameter.

Menu Item Explanations:

SET UNITS

This should be the first parameter that is set. This will be the units (Torr, mBar, or Pascal) that are used for all

other settings. If the setpoints have already been set, changing units is not recommended because the setpoints

will return to their default setting. [Factory default = Torr.]

Note: Selection of mBar or Pascals requires a one time special procedure when setting Vacuum and ATM

(atmosphere). See note below under SET VACUUM and SET ATM.

SET VACUUM

Setting the Zero Point (Vacuum Adjust):

1. Evacuate the system to a pressure less than 0.1 mTorr.

2. Go to the “Set Vacuum” screen. When the pressure is below 0.1 mTorr, press the “Press to set vac” key.

The zero point is now set.

Note: When operating in units of mBar or Pascals, you must first set atmosphere. (see SET ATM listed

below). Next access the SET VACUUM menu and set vacuum. Failure to do so will result in incorrect

setting of the gauge. If you change units or reset to factory defaults then the same procedure must be

followed again if the units of display is being set to mBar or Pascals.

SET ATM

Setting the Span Point (Atmosphere Adjust):

1. Backfill the system with Nitrogen to a known pressure above 400 Torr.

2. Go to the “Set ATM” screen. When desired system pressure is stable, adjust the pressure on the screen to

the known value using the INCRease and DECRease keys on the left side of screen. Press the SAVE/EXIT

key to save the new atmosphere value.

Note: When operating in units of mBar or Pascals, you must first set atmosphere. Next access the SET

VACUUM menu and set vacuum. Failure to do so will result in incorrect setting of the gauge. If you

change units or reset to factory defaults then same the procedure must be followed again if the units of

display is being set to mBar or Pascals.

Instruction Manual InstruTech VGC-301 Convection Vacuum Gauge Controller

InstruTech, Inc page 10

SET SP1 ON and SET SP2 ON:

These setpoints correspond to the turn on points for each relay. The relays will turn on when the pressure drops

below this setting. [Factory default = 100 mTorr.]

SET SP1 OFF and SET SP2 OFF:

These setpoints correspond to the turn off points for each relay. The relays will turn off when the pressure rises

above this setting. [Factory default = 200 mTorr.]

SET ADDR:

This is the lower nibble of the one byte RS485 device address. (e.g. Setting this to a 5 would make the address

be 0x05 in hex; a 15 would be 0x0F in hex; if the address offset is equal to 0.) Note that Address must be used

even in RS232 commands. [Factory default = 1 ]

SET ADDR OFFSET

This is the upper nibble of the one byte RS485 address. (e.g. Setting this to a 5 (with ADDR = 0) would make the

address 0x50, a 15 would be 0xF0.) [Factory default = 0.]

SET BAUD

This sets the baud rate for the RS485 and the RS232. The baud rate can be set to many other values through

the serial interface command set. The parity can also be changed. When this occurs, the current setting will be

shown in the list of choices and can be re-selected if changed. [Factory default = 19.2K baud]

RS485 TYPE

Select 2-wire or 4-wire configuration for the RS-485 interface.

SET ANALOG

Selects non-linear, linear, or log-linear for the analog output.

SET LINEAR

This will take the user to 4 screens to setup the linear analog output.

a) Set the minimum pressure,

b) Set the minimum voltage corresponding to the minimum pressure.

c) Set the maximum pressure.

d) Set the maximum voltage corresponding to the maximum pressure.

The linear output voltage can be any values between 10mV and 10V corresponding to pressure values between 1

mTorr and 1000 Torr. [Factory default is 10mV to 10 Vdc corresponding to 1 mTorr to 1 Torr.]

INFO

This screen shows the Instrutech phone number for questions and the unit software version.

Calibration:

All InstruTech gauges are calibrated prior to shipment using Nitrogen. However, you can calibrate the VGC-301

against your own standards, using the zero and span settings, as described above. Zero and span affect the

displayed pressure values and the output signals. Care should be exercised when using gases other than

nitrogen N2- See Appendix B for more information.

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