Cannon DVR 1000H Owner's manual

Brand: Cannon

Model: DVR 1000H

Category: Measuring, testing & control

Type: Owner's manual

Instruction & Operation Manual

DVR

Digital

Vacuum

Regulator

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CONTENTS

DVR INTRODUCTION 1

Overview ............................................................................................................................ 1

Product specifications......................................................................................................... 2

UNPACKING THE DVR 3

Safety warnings .................................................................................................................. 3

INITIAL SETUP 5

Tubing connections............................................................................................................. 5

DVR-1000 connections .......................................................................................... 5

DVR-1500 connections .......................................................................................... 6

Vacuum trap............................................................................................................ 6

Electrical connections......................................................................................................... 7

DVR OPERATION 9

Default settings................................................................................................................... 9

Accessories ......................................................................................................................... 9

Turning on the DVR ........................................................................................................... 9

Meter Display/key control options ..................................................................................... 9

Selecting a channel ................................................................................................. 9

Adjusting the flow rate ..................................................................................................... 10

Bleeding vacuum .............................................................................................................. 11

Adjusting control set points.............................................................................................. 11

Adjusting HI/LO set points .............................................................................................. 12

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

DVR CLEANING AND MAINTENANCE 13

Cleaning............................................................................................................................ 13

Maintenance .....................................................................................................................13

Troubleshooting the DVR .................................................................................... 13

WARRANTY/RETURN INFORMATION 15

Products limited warranty................................................................................................. 15

Reagent and chemical warranty........................................................................................ 15

Returning a product to CANNON

.................................................................................. 16

APPENDIX A — REPLACEMENT PARTS 17

APPENDIX B — CALIBRATION OF THE SETRA GAUGE 19

Removing the differential gauge from the DVR .................................................. 20

Reassembling the DVR unit ................................................................................. 21

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CHAPTER

DVR INTRODUCTION

Overview

Purpose of the manual

This manual provides information on the installation and operation of

your DVR 1000 Series Digital Vacuum Regulator (DVR). The informa-

tion provided is applicable to all DVR Series instruments listed in the

table on page two.

DVR function

Your CANNON

DVR 1000 Series instrument has been designed to

regulate vacuum at 300 mm Hg below atmospheric pressure. Vacuum may

be adjusted to other settings from 28 to 411 mm Hg. The DVR may be

used with all CANNON

temperature baths including the CT and TE

Series high and low temperature instruments.

Applications

Your DVR may be used in conjunction with the Cannon-Manning cali-

brated CMVC series viscometers, the Modified Koppers Calibrated

MKVC Series viscometers, and the Asphalt Institute Vacuum Calibrated

AIVC series viscometers for measurement of highly viscous materials

such as asphalt cement at 60°C (140°F) per ASTM D 2171 specifications.

Both the Cannon-Manning and the Modified Koppers permit viscosity

measurement from 42 to 200,000 poise. The Asphalt Institute AIVC

Series 400R and 800R viscom-

eters, also available from

CANNON

, extend that range

to 1,400,000 poise and

5,800,000 poise respectively

(see ASTM D 2171, Table X2).

Your DVR is also useful in other

laboratory systems where

accurate measurement and

control of vacuum from 28 to

330 mm Hg below atmospheric

pressure is required.

Series differences

The DVR-1000 is designed to

regulate the user’s in-house

vacuum system.

The DVR-1500 includes an

internal vacuum pump and does

not require in-house vacuum.

Digital Vacuum Regulator

with

CANNON

CT-1000

Constant Temperature Bath

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

Configuration options

The DVR is available from CANNON

in both horizontal and vertical

configurations. With its sturdy steel construction, the horizontal DVR

unit will support any CANNON

CT or TE Series temperature bath. The

vertical configuration offers convenience in locations where work space

is at a premium.

Product specifications

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ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CHAPTER

UNPACKING THE DVR

Unpacking procedure

1. Remove all components from the shipping container(s).

2. Remove any and all packing materials (styrofoam, etc.) from the

components.

3. Verify reception of shipped materials by comparing equipment items

with packing/parts list(s). Report missing items to CANNON

Instrument Company immediately.

4. Inspect each component for signs of damage. Report damages to the

shipper and to the CANNON

Instrument Company immediately.

Damaged items

Retain all packing materials until the instrument is connected and func-

tioning properly. If any component(s) must be returned to

CANNON

Instrument Company, the damaged item(s) should be pack-

aged in the original shipping container. Refer to the final chapter of this

manual for instructions on returning defective equipment. Customers

outside the United States should contact the local CANNON

agent for

procedures on returning products to CANNON

Safety warnings

Please observe the following safety procedures and notices for proper

operation of your DVR unit:

• Make sure that you read and understand all operating instructions

and safety precautions listed in this manual before installing or

operating your unit. If you have questions regarding instrument

operation or documentation, contact CANNON

Instrument

Company.

• Take appropriate precautions when lifting and moving the unit.

• Position the unit on a sturdy table or workbench.

• Provide at least 15 cm (6”) of ventilation space to the rear of the unit.

• Do not turn the power switch on and off rapidly and repeatedly.

• Transport the unit with care. Sudden jolts may damage components.

• Observe all warning labels. Never remove warning labels.

• Always turn off the unit and disconnect the mains cable from the

power source before accessing the electronics drawer or moving the

unit.

• Never operate the equipment with damaged mains power cables.

• Refer all service and repairs to qualified personnel.

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

NOTE

Deviation from the installation or operation procedures described in this

manual may result in a hazardous situation.

In addition to the previous warnings, additional cautions are posted in the

manual. These warnings may be designated by an appropriate symbol

inside an equilateral triangle. General cautions are indicated with an

exclamation point (see diagram, left).

Turning off vacuum

It is advisable to turn off the vacuum source when changing DVR meter

settings. For the DVR-1000 instrument it will be necessary to disconnect

the connection to the in-house vacuum source or turn the vacuum off. For

the DVR-1500 unit, which includes a built-in vacuum pump, the vacuum

can be shut off by switching the DVR front panel switch to the METER

position. Turning off the vacuum prevents vacuum from building up

while the meter gauge settings are being altered.

General Caution

ANNONANNON

ANNON

Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CHAPTER

INITIAL SETUP

Your DVR is shipped from CANNON

fully assembled. Only vacuum

and electrical power connections must be made before your DVR unit is

fully operational.

Positioning the DVR

Place the DVR instrument on a sturdy laboratory bench or table at its

desirable location, close to the constant temperature bath with ample

space for rear ventilation. Temporarily orient the unit for easy access to

the front and rear panels.

NOTE

The horizontal DVR models may be used as a base for any CANNON

CT or TE Series bath.

Tubing connections

Tubing connections for the DVR vary depending on the specific model.

Follow the instructions appropriate for your unit. Make sure that there is

adequate slack in the tubing to avoid kinks in the line which might

prevent optimal control.

DVR-1000 connections

Vacuum source connection

Ensure that your vacuum source meets the specifications listed on page

two (A vacuum regulator may be required). To connect the DVR-1000 to

your in-house vacuum, secure the tubing to the 1/8” NPT PORT connec-

tion on the DVR rear panel using an appropriate fitting (not supplied).

Connecting to your application

Connect the DVR-1000 to your vacuum manifold or application using

the 4' length of 1/4" x 5/8" o.d. rubber vacuum tubing provided by

CANNON

. Secure the tubing to the Vacuum Manifold Inlet on the

front panel of the DVR (see photo, next page). Push the tubing firmly

into place over the barbed nipple fitting. Attach the other end of the tube

to your manifold/application, clamping the connection if necessary.

Check all vacuum connections to make sure they are secure.

The DVR rear panel

(PORT connection}

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

DVR front panel vacuum connection

DVR-1500 connections

The DVR-1500, although it has its own internal vacuum pump, uses the

identical front panel connection (see photo). Connect the DVR-1500 to

your vacuum manifold or application using the 4' length of 1/4" x 5/8"

o.d. rubber vacuum tubing provided by CANNON

. Secure the tubing to

the Vacuum Manifold Inlet on the front panel of the DVR. Push the

tubing firmly into place over the barbed nipple fitting. Attach the other

end of the tube to your manifold/application, clamping the connection if

necessary. Check the vacuum connections to make sure they are secure.

NOTE

The PORT connection on the rear of the DRV-1500 (see photo,

previous page) is used as an exhaust port for the vacuum. On this

model, use the CANNON

-supplied muffler to seal the port. Screw the

muffler onto the PORT connection, tightening the muffler finger-tight.

Vacuum trap

The glass bottle vacuum trap at the front of the DVR is designed to

prevent liquids from being pulled into the system and damaging the

internal components. The trap will only “catch” about two ounces of

fluid; it is not suitable for use as a reservoir or waste receptacle. In the

event that a small amount of fluid does enter the vacuum system, imme-

diately power down the unit and empty the glass bottle. You may also

wish to clean the 10’ rubber tubing with appropriate solvent(s). Thor-

oughly dry the tubing before reconnecting it to the DVR.

CAUTION

Pulling liquid solvent past the vacuum trap may cause internal damage

to DVR components and create a safety hazard.

ANNONANNON

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

Electrical connections

After vacuum tubing connections have been made successfully, use the

power cord provided with the DVR to supply electricity to the unit.

WARNING

When supplying power to this instrument, connect the protective ground

(earth) terminals of the instrument to the protective conductor of the

(supplied) line (MAINS) power cord. The main plug for the power cord

should only be inserted in a socket outlet (receptacle) provided with a

protective ground (earth) contact.

Do not use an extension cord (power

cable) without a protective conductor (grounding).

The ~MAINS symbol indicates instructions or connections for the AC

power supply. The AC Power input must match the electrical specifica-

tions listed on the label on the rear panel of the instrument. The supplied

AC Mains power cord must be attached to the connector labelled

~MAINS. This connection serves as a means of disconnect and should be

readily accessible.

The (O) symbol indicates the OFF position for the electrical switches for

your unit (AC Mains or accessories).

Connecting power cable

1. Make sure that the 3-position switch on the front panel is set to the

center STANDBY position.

2. Plug the power cord into the DVR rear panel IEC power inlet con-

nector.

3. Plug the other end of the cord into an appropriate electrical outlet.

ANNONANNON

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

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ANNONANNON

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CHAPTER

DVR OPERATION

Default settings

The DVR is designed to display and regulate vacuum for viscometry

applications per ASTM D 2171 specifications. The DVR regulates

vacuum using set points preset at CANNON

for efficient regulation of

vacuum at 300 mm Hg below atmospheric pressure.

To adjust the control settings to regulate at other pressures, see

section on adjusting HI/LO Setpoints.

Accessories

The DVR may be used in conjunction with the CANNON

3VM and

4VM vacuum manifolds. The 3VM manifold (catalogue # 9726-V10) has

three valves and is intended for use with the CANNON

CT-500 Con-

stant Temperature Bath. The 4VM manifold (catalogue # 9726-V05) has

four valves and is intended for use with the CANNON

CT-1000 and

CT-2000 Constant Temperature Baths.

Turning on the DVR

Applying power

1. Make sure the instrument power cord is connected to an appropriate

power source (electrical requirements are specified on the rear panel

of the DVR unit).

2. Make sure that all vacuum connections are secure.

3. Toggle the POWER switch on the DVR front panel to the RUN

position (see photo). The gauge LCD will be activated and the

solenoid valves will “click” open. On DVR-1500 models, the internal

vacuum pump will engage.

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

Meter Display/Key control options

Adjusting the flow rate

Solenoid regulators

Vacuum in the DVR system is regulated by two solenoid valves mounted

inside the DVR unit. The valves operate in tandem to maintain consistent

vacuum at the desired setting. Control set points for the solenoid valves are

preset at CANNON

to regulate vacuum at 300 mm Hg below atmo-

spheric pressure. If it is necessary to adjust these settings, see Chapter 5.

Rate Adjust knob

Solenoid valve efficiency is influenced by the rate of flow in the DVR

vacuum/pressure valve system. The flow rate is regulated with an internal

needle valve. This valve is adjusted manually from the DVR front panel

using the Rate Adjust knob.

Recovery/overshoot

The flow rate also affects the recovery time (the amount of time required

to restore desired vacuum settings when a significant change has oc-

curred) and the amount of overshoot (the degree of vacuum change in

excess of the desired reading observed before the vacuum stabilizes at the

desired setting).

Using the Rate Adjust knob

Set the Rate Adjust knob so that the instrument attains the desired

setting as quickly as possible without overshooting the control target by

more than 0.5 mm Hg. Turn the knob clockwise to decrease the flow rate

or counterclockwise to increase the flow rate.

Limiting overshoot

For example, if you are controlling at 300 mm Hg, increase the flow rate

until the overshoot produces a gauge reading greater than 300.5 mm Hg.

Than reduce the flow rate until the overshoot drops to less than 0.5 mm

Hg. You can check the new setting by opening and closing switches on

the vacuum manifold, causing a drop in vacuum. Then observe the

recovery time and overshoot.

CAUTION

It is impossible to totally close the needle valve controlled by the Rate

Adjust knob. Do not try to force the valve closed using to the Rate Adjust

knob, or you may damage the valve components.

NOTE For the needle valve to function efficiently, the solenoid SET 2 value

must be higher than the solenoid SET 1 value (see Chapter 5).

Bleeding vacuum

If the DVR instrument will not be used for a period of time, you may

toggle the front panel switch to the center STANDBY position. This

action disengages solenoid operation (both models) and turns off the

DVR-1500 vacuum pump.

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

It is advisable to bleed off residual DVR system vacuum to 250 mm or

lower when the instrument is in the center STANDBY position. This will

prevent the unit from overshooting the target vacuum (default 300 mm

Hg) when the toggle switch is returned to the RUN position.

Adjusting OFFSET

“OFFSET”

The “OFFSET” command allows the user to adjust the reading relative to

a known value. To set the “OFFSET” use the following procedure:

1. Press and hold the SCAN/adj and HOLD/mode keys for 8 seconds,

then release; the display will alternate between “cal” and “noYes” for

ten seconds.

2. To specify “yes” and select “CH1”, press and hold the HOLD/mode

key to display “CH1” .

3. Press the HOLD/mode key to display “ALAr”.

4. Press the SCAN/adj key to display “OFFST”.

5. Press the HOLD/mode key to display the number “0”.

6. Set the value you wish the meter to display at the presently applied

pressure.

 Press the SCAN/adj key to move the numbers up (+).

 Press the HOLD/mode key to move the numbers down (-).

 When the desired number is reached, press the SCAN/adj and

HOLD/mode keys at the same time. The number will flash

repeatedly. Then, press the SCAN/adj key to readjust the number

or the HOLD/mode key to accept it. After the number is ac-

cepted, the meter will display “bUSY” for 10 seconds and then

resume normal operation.

Adjusting HI/LO setpoints

NOTE The HI/LO alarm setpoints are used as control setpoints

“ALAr”

The “ALAr” command allows you to set high and low pressure alarm

points. The HI or LO indicator light is lit if the applied pressure exceeds

the set values. The alarm output signals are available at the terminal strip.

To set the Hi and Lo , use the following procedure:

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

1. Press and hold the SCAN/adj and HOLD/mode keys for 8 seconds,

then release; the display will alternate between “cal” and “noYes” for

ten seconds.

2. To specify “yes” and select “CH1”, press and hold the HOLD/mode

key to display “CH1”.

3. Press the HOLD/mode key to display “ALAr”.

4. Press the HOLD/mode key to display the present value of the Low

Alarm point.

5. Set the LO ALARM Point.

NOTE

The decimal point that was set during calibration (CAL_U, CAL_C) will

be displayed.

 Press the SCAN/adj key to move the numbers up (+).

 Press the HOLD/mode key to move the numbers down (-).

 When the desired number is reached, press the SCAN/adj and

HOLD/mode keys at the same time. The number will flash

repeatedly. Then, press the SCAN/adj key to readjust it or the

HOLD/mode key to accept it.

6. Repeat the same procedure as in Step 5 to set the HI ALARM Point.

After the number is accepted the DATUM 2000™ will resume normal

operation.

Selecting set point values

Control set points for the DVR have been determined empirically.

Selecting new set points to control at a different level of vacuum or at a

different unit of measurement, will involve some trial and error.

Once your control point (desired vacuum setting) is known, you must

select and test new set points. Normal factory set points may provide a

useful reference. The unit is shipped from CANNON

with a value of

292.5 mm Hg for LO and a value of 299.6 mm Hg for HI These settings

allow the DVR to control at 300 mm Hg ± the tolerance factor of 0.5 mm

Hg.

Mechanically, the DVR is plumbed so that the solenoid controlled by the Lo

possible to achieve a vacuum very close to the desired value in a very short

time. For the HI solenoid, the vacuum source is routed through the Rate

Adjust valve, permitting a finer adjustment. For accurate control, both set

points and the Rate Adjust valve must be set properly.

Remember that the Rate Adjust valve setting will vary depending on the

values chosen for the solenoid set points. When resetting the control

points you must also check/adjust the Rate Adjust knob.

Setting procedure

ANNONANNON

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Digital Vacuum Regulator Instruction & Operation Manual

Version 1.3 — May, 2009; CANNON

Instrument Company

2139 High Tech Road • State College, PA • 16803 • USA

CHAPTER

DVR CLEANING AND

MAINTENANCE

Cleaning

CAUTION

Before cleaning the DVR, turn off the instrument and unplug the power

cord. Do not clean the instrument while it is in operation.

Periodically clean the outside of the unit with a cloth moistened with

water and/or a mild detergent solution. Do not permit water or detergent

solution to drip into the unit electrical drawer. Wipe down the front panel,

sides and top. Remove the vacuum trap jar and wipe out the vacuum trap

enclosure and the glass jar. If there is oil or residue in the glass jar, use

the appropriate solvent and drying agent to clean the jar. Reattach the jar

after cleaning. The unit will be inoperable unless the vacuum trap is in

place.

Maintenance

 Do not allow oil to accumulate in the vacuum trap. Remove the jar,

empty and clean as often as necessary. Make sure to remove power

from the instrument BEFORE removing the vacuum trap.

 Periodically inspect the line cord for fraying and/or exposed wiring.

When removing the cord from the power outlet, pull it out by the

plug. Do not pull on the cord.

Troubleshooting the DVR

When you initially encounter a problem with the DVR, make sure that all

tubing and electrical connections are correct and secure, and that the

power switch is in the correct position.

Vacuum system leak

If the vacuum system is leaking, check the vacuum trap jar and make

certain that it is screwed tightly into position with the lip of the jar

contacting the cork seal on all sides.

DVR Manual – Chapter 5

Chapter 5 of DVR-1500 Manual: Altering

Factory Settings

The Meriam gauge installed on your DVR unit offers several programmable registers for adjusting the

operating parameters of the instrument. For a full description of programming options, consult the

Meriam manual included with your DVR instrument.

Changing the engineering unit of measurement

One of nine different units of measurement may be selected for the LCD.

Table 1: Engineering Units

Display

Unit of Measure

mm Hg

Millimeters of mercury

In ℎ

Inches ℎ

psi

Pounds per square inch

Kg/cm

Kilograms per square centimeter

kPa

Kilopascals

mbar

Millibars

bar

Bars

cmℎ

Centimeters ℎ

In Hg

Inches of mercury

None*

User units

*when user units are selected no engineering unit is displayed. See section Setting User Units for

instructions on defining User Units.

Changing engineering units (lockout not enabled)

1. To change engineering units when front panel lockout is not enabled (no password necessary)

press the UP (ENG UNITS) key when the gauge is in Measurement mode. The current

engineering unit will begin flashing.

2. Press the UP/DOWN arrow keys until the desired engineering unit is flashing.

3. Press the PRGM key. The gauge will return to Measurement mode with the new unit of

measure. The set point measurement values in the P registers will automatically be reset to

display and function using the selected engineering units.

Adjusting Control Set Points

To adjust the control set points you will set the P5 register to correspond to your desired set point

selection. Then you will change the numeric values for each set point. The decimal point location for

each set point will be determined after you have set the numeric value.

DVR Manual – Chapter 5

Note: During any programming operation, if there is no keypad activity for approximately one minute

the current programming operation will be aborted and the gauge will return to the Measurement

mode.

Adjustment Procedure: to adjust the control set points (SET 1 and SET 2)

1. Make certain the gauge is in the measurement mode displaying the current vacuum/pressure

reading.

2. Turn the DVR front panel switch to the METER setting.

3. Press the PRGM key. The gauge will display the P0 register indicator.

Note: if lockout is enabled, you will be prompted to enter the lockout code. See Front Panel Lockout.

4. Use the UP/DOWN arrow keys to scroll though the register options until you get to the P5

5. When the gauge LCD displays P5, press the PRGM key again to display the current register

setting.

6. Use the UP/DOWN arrow keys to scroll through the P5 program options until the desired

setting (3, if both set points are desired) is displayed. See below. Then press the PRGM key.

a. Select 0 to disable control for both set points

b. Select 1 to enable Set Point 1 only (P6 register)

c. Select 2 to enable Set Point 2 only (P7 register)

d. Select 3 to enable Set Points 1 & 2 (P6 & P7 registers)

7. Use the UP/DOWN arrow keys to scroll through the register options until the P6 register is

displayed.

8. Press the PRGM key to display the current setting for the set point. Notice that the left-most

digit is flashing.

9. Use the UP/DOWN arrow keys to change the digit to the desired value. Then press PRGM

again. The next numeral will begin flashing.

10. Repeat step 9 until all numeric values have been reset and the decimal point is flashing.

11. Press the UP/DOWN keys to relocate the decimal point until the desired value for the set point

is displayed on the LCD.

12. Press PRGM to save the new value to the register. The LCD will display the P register.

13. Press the UP key to display the P7 register.

14. Repeat steps 8 through 12 to adjust the P7 set point value.

15. When both set points have been set correctly press the ON/OFF key to return to the

measurement mode.

Selecting Set Point Values

Control set points for the DVR have been determined empirically. Selecting new set points to control at

a different level of vacuum or at a different unit of measurement will involve some trial and error.

DVR Manual – Chapter 5

Once your control point (desired vacuum setting) is known, you must select and test new set points.

Normal factory set points may provide a useful reference. The unit is shipped from CANNON® with a

value of 292.5 mm Hg for SET1 and a value of 299.6 mm Hg for SET2. These settings allow the DVR to

control at 300 mm Hg ± the tolerance factor of 0.5 mm Hg.

Mechanically, the DVR is plumbed so that that solenoid controlled by the SET1 register allows air to

bypass the Rate Adjust valve. This feature makes it possible to achieve a vacuum very close to the

desired value in a very short time. For the SET2 solenoid, the vacuum source is routed through the Rate

Adjust valve, permitting a finer adjustment. For accurate control, both set points and the Rate Adjust

valve must be set properly.

Remember that the Rate Adjust valve setting will vary depending on the values chosen for the solenoid

set points. When resetting the control points you must also check/adjust the Rate Adjust knob.

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Cannon DVR 1000H Owner's manual

Brand: Cannon

Model: DVR 1000H

Category: Measuring, testing & control

Type: Owner's manual

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Cannon DVR 1000H Owner's manual

Cannon DVR 1000H Owner's manual

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