Teledyne Hastings Instruments 2002 Manuel utilisateur

Model 2002 page 1

MODEL 2002MODEL 2002

MODEL 2002

VAA

ACUUM GCUUM G

CUUM GCUUM G

CUUM GAA

AUGEUGE

UGEUGE

UGE

INSTRUMENTS

TELEDYNE HASTINGS

INSTRUCTION MANUAL

page 2 Model 2002

Manual Print HistoryManual Print History

Manual Print History

The print history shown below lists the printing dates of all revisions and addenda created for

this manual.The revision level letter increases alphabetically as the manual undergoes subse-

quent updates.Addenda,which are released between revisions,contain important change

information that the user should incorporate immediately into the manual.Addenda are num-

bered sequentially.When a new revision is created,all addenda associated with the previous

revision of the manual are incorporated into the new revision of the manual. Each new revision

includes a revised copy of this print history page.

Revision A (Document Number 149-0798) .......................................................September 1998

Revision B (Document Number 149-032000) ......................................................... March 2000

Revision C (Document Number 149-052002) .............................................................May 2002

Revision D (Document Number 149-102002)....................................................... October 2002

Revision E (Document Number 149-062004).............................................................. June 2004

Revision F (Document Number 149-082005)..........................................................August 2005

Revision F (Document Number 149-102005)........................................................ October 2005

Visit www.teledyne-hi.com for WEEE disposal guidance.

Hastings Instruments reserves the right to change or modify the design of its equipment without

any obligation to provide notification of change or intent to change.

CAUTION

Refer to accompanying documents

CAUTION

If equipment is not used in the manner specified by this manual,

protection provided by the equipment may be impaired

Model 2002 page 3

Table of Contentsable of Contents

able of Contentsable of Contents

able of Contents

1.01.0

1.0 GENERAL INFORMAGENERAL INFORMA

GENERAL INFORMAGENERAL INFORMA

GENERAL INFORMATIONTION

TIONTION

TION ......................................................................................................................................

......................................................................................................................................

................................................................... 55

1.1 Features................................................................................................................................5

1.2 Model 2002 Sensors ............................................................................................................5

1.3 Model 2002 Control Unit ....................................................................................................6

1.4 Specifications .......................................................................................................................6

2.02.0

2.0 INSTINST

INSTINST

INSTALLAALLA

ALLAALLA

ALLATIONTION

TIONTION

TION..............................................................................................................................................................................

..............................................................................................................................................................................

....................................................................................... 77

2.1 Receiving Inspection............................................................................................................7

2.2 Quick Start...........................................................................................................................7

2.3 Transducer Installation ........................................................................................................8

2.4 Control Unit Installation ......................................................................................................8

2.5 Initial Operation...................................................................................................................8

3.03.0

3.0 FRFR

FRFR

FRONT PONT P

ONT PONT P

ONT PANEL OPERAANEL OPERA

ANEL OPERAANEL OPERA

ANEL OPERATIONTION

TIONTION

TION ................................................................................................................................

................................................................................................................................

................................................................ 99

3.1 Overall Functional Description............................................................................................9

3.2 RUN Mode ........................................................................................................................10

3.3 HI and LOW Set Point Modes ..........................................................................................11

3.4 CAL Mode.........................................................................................................................11

3.5 GAS Mode.........................................................................................................................14

3.6 UNITS Mode ....................................................................................................................15

4.04.0

4.0 REAR PREAR P

REAR PREAR P

REAR PANEL DESCRIPTIONANEL DESCRIPTION

ANEL DESCRIPTIONANEL DESCRIPTION

ANEL DESCRIPTION............................................................................................................................

............................................................................................................................

.............................................................. 1717

1717

4.1 Remote Zero Input ...........................................................................................................17

4.2 Analog Output ...................................................................................................................17

4.3 TTL Outputs.....................................................................................................................19

4.4 Power Entry Module..........................................................................................................20

5.05.0

5.0 THEORTHEOR

THEORTHEOR

THEORY OF OPERAY OF OPERA

Y OF OPERAY OF OPERA

Y OF OPERATIONTION

TIONTION

TION ......................................................................................................................................

......................................................................................................................................

................................................................... 2121

2121

5.1 Piezoresistive Sensor ..........................................................................................................22

5.2 Pirani Sensor......................................................................................................................24

5.3 Dual Sensor Operation ......................................................................................................26

6.06.0

6.0 COMMUNICACOMMUNICA

COMMUNICACOMMUNICA

COMMUNICATIONS OPTION BOTIONS OPTION BO

TIONS OPTION BOTIONS OPTION BO

TIONS OPTION BOARDARD

ARDARD

ARD ........................................................................................

........................................................................................

............................................ 2929

2929

6.1 RS-232-E Interface Specifications.....................................................................................29

6.2 RS-232 Interface Connector Pin Assignments ..................................................................29

6.2.1 RS-485 Interface Connector Pin Assignments .........................................................30

6.3 Operation of the Serial Interface........................................................................................30

page 4 Model 2002

7.07.0

7.0 RELARELA

RELARELA

RELAY INTERFY INTERF

Y INTERFY INTERF

Y INTERFAA

ACE OPTION BOCE OPTION BO

CE OPTION BOCE OPTION BO

CE OPTION BOARDARD

ARDARD

ARD............................................................................................

............................................................................................

.............................................. 3535

3535

7.1 Relay Board Specifications .............................................................................................. 35

7.2 Relay Connector Pin Assignment .................................................................................... 35

7.3 Operation ......................................................................................................................... 36

8.08.0

8.0 4-20mA INTERF4-20mA INTERF

4-20mA INTERF4-20mA INTERF

4-20mA INTERFAA

ACE OPTION BOCE OPTION BO

CE OPTION BOCE OPTION BO

CE OPTION BOARDARD

ARDARD

ARD ..........................................................................................

..........................................................................................

............................................. 3737

3737

8.1 4-20 mA Interface Connector Pin Assignments .............................................................. 37

8.2 Operation ......................................................................................................................... 38

9.09.0

9.0 0-100-10

0-100-10

0-10 VV

Volt INTERFolt INTERF

olt INTERFolt INTERF

olt INTERFAA

ACECE

CECE

CE ......................................................................................................................................................

......................................................................................................................................................

........................................................................... 3939

3939

9.1 0-10Volt Interface Connector Pin Assignments .............................................................. 39

10.010.0

10.0

TRTR

TROUBLESHOOOUBLESHOO

OUBLESHOOOUBLESHOO

OUBLESHOOTING GUIDETING GUIDE

TING GUIDETING GUIDE

TING GUIDE ....................................................................................................................

....................................................................................................................

.......................................................... 4141

4141

11.011.0

11.0

WARRANTYARRANTY

ARRANTYARRANTY

ARRANTY AND REPAND REP

AND REPAND REP

AND REPAIRAIR

AIRAIR

AIR ..................................................................................................................................

..................................................................................................................................

................................................................. 4343

4343

11.1 Warranty Repair Policy.................................................................................................... 43

11.2 Non-Warranty Repair Policy ........................................................................................... 43

12.02.0

2.02.0

2.0 DIADIA

DIADIA

DIAGRAMSGRAMS

GRAMSGRAMS

GRAMS AND DRAAND DRA

AND DRAAND DRA

AND DRAWINGSWINGS

WINGSWINGS

WINGS ....................................................................................................................

....................................................................................................................

.......................................................... 4545

4545

Model 2002 page 5

General Information

SECTION 1

The Model 2002 is a wide range vacuum measuring instrument consisting of a digital microproces-

sor-based display unit,a miniature,rugged, thin film based sensing element that measures from

below 1x10-4 up to 100 Torr, a piezoresistive sensor that measures from 1 to 1000 Torr,

EEPROM (Electrically Erasable/Programmable Read Only Memory), and an interconnecting

cable. Together, these components provide accurate vacuum measurement over 7 decades of

vacuum from 1x10-4 to 1000 Torr. This instrument is a new design approach based on over 50

years of experience by Hastings Instruments with well-known and widely used thermal conduc-

tion vacuum measurement techniques. The Model 2002 is designed for quick, easy installation

and will provide the user with long lasting, trouble free, accurate vacuum measurement.

1.1 Features

• Wide dynamic range: 1x10-4 to 1000 Torr

• Compact rugged design

• Attitude insensitive

• Fast dynamic response

• Withstands 150 psig positive pressure

• Linear per decade

• Bakeable to 2500C

• TTL output process control

• Interchangeable transducer

• Corrosion resistant

1.2 Model 2002 Sensors

The Model 2002 transducer is comprised of an ion implanted, piezoresistive,direct force sensor

and a thin film Pirani type sensor. The Pirani sensing element is a Pt thin film serpentine element

(see Figure 5.3a) deposited on a 1 micron thick Si3N4 membrane. The membrane is peripherally

supported by a Si box shaped die and is covered by a thick Si lid parallel to the membrane and

open on two ends (see Figure 5.3b). The piezoresistive unit is an ion implanted Wheatstone

bridge in a 50 micron thick Si membrane peripherally supported by a Si box shaped die which

has been anodically bonded to a Pyrex substrate.

The dual sensor assembly is encased in a corrosion resistant 316 stainless steel tube shell. The

durable tube design withstands high pressure (150 psig/10.2 bar) and high pressure surges. Since

the Pirani sensor is miniaturized and employs a Pt thin film on a Si3N4membrane (instead of a

conventional long fragile wire), the transducer can withstand high levels of mechanical shock.

The Model 2002 is designed for fast response. The micromachined sensing elements have a very

small mass and operate in a constant temperature (Pirani) and a constant current (piezo) feed-

back mode. This makes response time very fast as compared to other commercially available

sensors which have to change the temperature of a significant mass to reflect pressure changes

and have a large internal volume which must equalize in pressure with the system before the

sensor can reach its final value. The transducer’s small internal volume (<1.5cc) permits rapid

pneumatic response to system pressure changes. Further, the small geometry of the transducer

prevents thermal convection currents which allows the sensor to be mounted in any orientation

without calibration shifts.

page 6 Model 2002

1.3 Model 2002 Control Unit

The Model 2002 control unit consists of the power supply, Pirani resistance bridge control, signal

processing and display circuitry. The user interface consists of a flat panel display with smooth operat-

ing tactile switches and large green LED digits (0.56"/14.2mm). The pressure is displayed in scientific

format using a 3 digit mantissa and a 1 digit (plus the sign) exponent. The pressure can be displayed in

Torr,mbar or Pascal. The instrument comes standard with 2 alarm setpoints that have TTL level

digital outputs. An optional dual relay board can be internally mounted to trip on the alarm setpoints

to turn on/off various equipment such as pumps, valves, heaters, bakeout ovens and safety equipment.

An optional 4-20 mA or 0-10V analog output board is also available. The Model 2002 instrument

accepts an external TTL level "Remote Zero" to zero the instrument when another instrument (e.g. an

ion gauge) indicates that the pressure is less than 1x10-5 Torr. The standard analog output is linear per

decade directly corresponding to the control unit’s display. The Model 2002 comes calibrated for

nitrogen. Conversion factors for other gases are selectable by the user (see section 3.5). This direct

readout display allows for flexibility in user system configurations which operate with various gases.

An optional serial interface board can be installed to provide RS232 or RS485 support. The Model

2002 control unit fits a standard DIN 43700 insert (1/4 DIN) and mounts into a 3.62 in. (92 mm)

square hole.The case is constructed of NORYL rated UL-94-V1 (self-extinguishing plastic) and is

equipped with mounting brackets that are adjustable up to 3/16” (4.8mm).

1.4 Specifications

Measuring range................................................................................................ 1x10-4 to 10+3 Torr

1.3x10-4 to 1.3x10+3 mbar

Accuracy (N2,T=230C) ..................................................+ 15% of reading (5x10-4 to 3x10+1 Torr)

+ 1.5% of reading (3x10+1 to 1x10+3 Torr)

Ambient temperature operating range............................................................................. 00to 500C

Bakeout temperature (with transducer electronics removed)................................................ 2500C

Analog output................................................................1.0-4.5 Volts (0.5VDC linear per decade)

Process control ................................................................ 2TTL outputs (1TTL auto zero input)

Digital readout................................................................Four green LED - resolution is three digit

(plus exponent)

Equipment operating range............................................................... 120/240V~, 0.25A, 50/60 Hz

A 6 ft., 3-wire power cord is provided with each unit.

Fuse .............................................................................................................................. 250V, 1/4 A.

Transducer mounting................................................................Any position without recalibration.

Transducer internal volume .................................................................................................. <1.5cc

Wetted material........................................................................................Au, Si3N4, Si, Pt, PyrexTM,

KovarTM and 316 stainless steel

Stability with voltage ....................................................................Variation in reading undetectable

as power fluctuates within power specification.

Weight (display, cable, and sensor) ............................................... Net: 2.5 lbs., Shipping: 3.4 lbs.

Transducer response time .................................................. Typically, less than 150 msec for a step

change from 10-3 Torr to 10+3 Torr.

Positive pressure ................................................................150 psig, Recalibration may be required

if unit is exposed to pressures greatly exceeding measuring range.

Model 2002 page 7

SECTION 2

Installation

This section is designed to assist in getting a new pressure gauge into operation as quickly and

easily as possible. Please read the following instructions thoroughly before installing the instru-

ment.

2.1 Receiving Inspection

Carefully unpack the Hastings Model 2002 Instrument (part # HPM-2002), transducer (part

#HPM-2002s) and cable (part # CB 2002). Inspect all items for any obvious signs of damage

due to shipment. Immediately advise the carrier who delivered the shipment if any damage is

suspected.

Compare each component shipped against the packing list. Ensure that all parts are present (i.e.

transducer, power supply, cables, etc.).In addition to the components listed on the packing list,

the shipment includes: AC power cord,panel mounting hardware, 9-pin female D connector.

Optional equipment or accessories will be listed separately on the packing list.

2.2 Quick Start

Folloollo

olloollo

ollow this procedure to get yw this procedure to get y

w this procedure to get yw this procedure to get y

w this procedure to get your newour new

our newour new

our new Model 2000 vModel 2000 v

Model 2000 vModel 2000 v

Model 2000 vacuum gauge up and racuum gauge up and r

acuum gauge up and racuum gauge up and r

acuum gauge up and running.unning.

unning.unning.

unning.

1.1.

1. RemoRemo

RemoRemo

Removv

ve sensor from protective sensor from protectiv

e sensor from protective sensor from protectiv

e sensor from protective package packag

e package packag

e packaging.ing.

ing.ing.

ing.

2.2.

2. TT

Transducer tube maransducer tube ma

ransducer tube maransducer tube ma

ransducer tube may be installed in any be installed in an

y be installed in any be installed in an

y be installed in any ory or

y ory or

y orientaienta

ientaienta

ientation.tion.

tion.tion.

tion. HoHo

HoHo

Howw

wevev

evev

ever if condensaer if condensa

er if condensaer if condensa

er if condensation istion is

tion istion is

tion is

likely to occur,likely to occur,

likely to occur, then the porthen the por

then the porthen the por

then the port should be ort should be or

t should be ort should be or

t should be orientaienta

ientaienta

ientated doted do

ted doted do

ted downwwnw

wnwwnw

wnward.ard.

ard.ard.

ard.

3.3.

3. When installing 1/8”When installing 1/8”

When installing 1/8”When installing 1/8”

When installing 1/8” NPT style transducer tube,NPT style transducer tube,

NPT style transducer tube,NPT style transducer tube,

NPT style transducer tube, use the 7/16”use the 7/16”

use the 7/16”use the 7/16”

use the 7/16” wrench flawrench fla

wrench flawrench fla

wrench flats onts on

ts onts on

ts on

the tube stem.the tube stem.

the tube stem.

4.4.

4. Connect transducer cable (orange) to controller .Connect transducer cable (orange) to controller .

Connect transducer cable (orange) to controller .Connect transducer cable (orange) to controller .

Connect transducer cable (orange) to controller .

5.5.

5. Connect other end of transducer cable to transducerConnect other end of transducer cable to transducer

Connect other end of transducer cable to transducerConnect other end of transducer cable to transducer

Connect other end of transducer cable to transducer..

A finger tight connectionA finger tight connection

A finger tight connection

is adequais adequa

is adequate for proper operate for proper opera

te for proper operate for proper opera

te for proper operation.tion.

tion.tion.

tion.

6.6.

6. If yIf y

If yIf y

If you haou ha

ou haou ha

ou havv

ve computer interface or process control options,e computer interface or process control options,

e computer interface or process control options,e computer interface or process control options,

e computer interface or process control options, these cables can nothese cables can no

these cables can nothese cables can no

these cables can noww

be abe a

be attached.ttached.

ttached.ttached.

ttached.

7.7.

7. I/O porI/O por

I/O porI/O por

I/O port diagt diag

t diagt diag

t diagram is gram is g

ram is gram is g

ram is giviv

iviv

iven in the manual.en in the manual.

en in the manual.en in the manual.

en in the manual.

8.8.

8. Connect theConnect the

Connect theConnect the

Connect the AA

AC poC po

C poC po

C poww

wer cord.er cord.

er cord.er cord.

er cord.

The Model 2002 automaThe Model 2002 automa

The Model 2002 automatically adjusts fortically adjusts for

tically adjusts fortically adjusts for

tically adjusts for

120/240120/240

120/240

VAA

AC 50/60 HzC 50/60 Hz

C 50/60 HzC 50/60 Hz

C 50/60 Hz..

9.9.

9. TT

Turur

urur

urn on pon on po

n on pon on po

n on poww

wer ser s

er ser s

er switch.witch.

witch.witch.

witch. Gauge is noGauge is no

Gauge is noGauge is no

Gauge is now reading pressure in units ofw reading pressure in units of

w reading pressure in units ofw reading pressure in units of

w reading pressure in units of

“T“T

“Toror

oror

orr”r”

r”r”

r” (default).(default).

(default).(default).

(default).

10.10.

10. FF

For best accuracor best accurac

or best accuracor best accurac

or best accuracyy

y,,

,the gauge should nothe gauge should no

the gauge should nothe gauge should no

the gauge should now be zeroed.w be zeroed.

w be zeroed.w be zeroed.

w be zeroed.

Pump the vPump the v

Pump the vacuum systemacuum system

acuum systemacuum system

acuum system

dodo

down to lown to lo

wn to lown to lo

wn to low 10w 10

w 10w 10

w 10-6-6

-6-6

-6

Toror

oror

orr (if possible).r (if possible).

r (if possible).r (if possible).

r (if possible).

Ideally the gauge should be operaIdeally the gauge should be opera

Ideally the gauge should be operated in thisted in this

ted in thisted in this

ted in this condi-condi-

condi-condi-

condi-

tion for one hourtion for one hour

tion for one hour..

11.11.

11. Place the Model 2002 in thePlace the Model 2002 in the

Place the Model 2002 in thePlace the Model 2002 in the

Place the Model 2002 in the “CAL“CAL

“CAL“CAL

“CAL””

””

”mode bmode b

mode bmode b

mode by using the mode sy using the mode s

y using the mode sy using the mode s

y using the mode switch.witch.

witch.witch.

witch. Press thePress the

Press thePress the

Press the

up and doup and do

up and down arwn ar

wn arwn ar

wn arroro

roro

rows simultaneously (“CALws simultaneously (“CAL

ws simultaneously (“CALws simultaneously (“CAL

ws simultaneously (“CAL””

””

”light is nolight is no

light is nolight is no

light is now flashing).w flashing).

w flashing).w flashing).

w flashing).

12.12.

12. Press thePress the

Press thePress the

Press the “ZER“ZER

“ZER“ZER

“ZERO”O”

O”O”

O” ss

switch once and returwitch once and retur

witch once and returwitch once and retur

witch once and return to then to the

n to then to the

n to the “R“R

“R“R

“RUN”UN”

UN”UN”

UN” mode using themode using the

mode using themode using the

mode using the

mode smode s

mode switch.witch.

witch.witch.

witch.

The gauge is now ready for normal operation and the display is a true indication of the system

pressure (P < 8Torr is N2equivalent).

page 8 Model 2002

2.3 Transducer Installation

The transducer may be installed in any orientation. Although the transducer is rugged and will

perform well in many harsh environments, the tube should be installed in a clean and careful

manner. The tube is configured with the vacuum fitting requested. If your vacuum environment

is highly contaminated or has unique fitting requirements,a Hastings filter or special adapter may

be needed. Please contact the Hastings Instruments Sales Department for assistance in your

system configuration.

2.4 Control Unit Installation

EnEn

Environment:vironment:

vironment:vironment:

vironment:

Indoor use

Altitude up to 2000 meters

Operating temperature range from 50to 400C

Maximum relative humidity: 80% for temperatures up to 310C decreasing linearly to 50%

relative humidity at 400C

Installation category II

Panel Mount Instranel Mount Instr

anel Mount Instranel Mount Instr

anel Mount Instructions:uctions:

uctions:uctions:

uctions:

The control unit can be panel mounted. See detail on page 43. The hole dimensions on the panel

are 3.62" x 3.62"(92.8mm x 92.8 mm). Slide the neoprene gasket that was shipped with the

control unit onto the case from the back. Slide the controller through the panel cutout. Hold the

hardware against the side and tighten the two screws.

Transducer Cableransducer Cable

ransducer Cableransducer Cable

ransducer Cable Attachment:Attachment:

Attachment:Attachment:

Attachment:

The threaded connector attaches to the transducer. A finger tight connection is adequate for

proper operation. The 9-pin male “D”connector attaches to the back panel (See Figure 4.2).

The transducer cable connects to the left hand connector when looking at the back.

I/O CableI/O Cable

I/O Cable Attachment:Attachment:

Attachment:Attachment:

Attachment:

The mating male plug to the I/O connector is supplied with the unit. An I/O cable can be wired

with the 9-pin female “D” connector to use the analog output,digital alarms or the remote zero

functions.The connector will accept 20 gauge or smaller wire. The pinout is shown in Figure 4.2

(back panel figure). A detailed description of these pins is given in Section 4.

2.5 Initial Operation

Upon applying power to the control unit a pressure measurement will be given in Torr for nitrogen.

However, it is recommended that the user follow the instructions for zeroing and adjusting the

output at atmospheric pressure in Section 3.4 ("Cal Mode").

Model 2002 page 9

Front Panel Operation

SECTION 3

3.1 Overall Functional Description

The front panel of the control unit is shown in Figure 3.1. The four circular blue buttons are

used for the selection of display readout and the input of data. The green data field displays the

data as determined by mode selection. The MODE switch toggles the control unit in a clockwise

fashion among the six modes of operation:

RUNUN

UNUN

UN Normal operation, pressure is displayed in scientific notation. The analog to digital

converter speed can be adjusted and the factory calibration can also be restored in

this mode. See Section 3.2 for further information.

HIGHHIGH

HIGH High set point is displayed in scientific notation,above this pressure the HIGH

TTL output will be +5V.

LOLO

LOWW

W Low set point is displayed in scientific notation,below this pressure the LOW TTL

output will be +5V.

CALCAL

CAL Pressure is displayed and can be adjusted.

GASGAS

GAS Gas number is displayed and selection may be changed.

UNITSUNITS

UNITS Units used to display pressure are selected.

In the RUN, HIGH, and LOW modes, it is possible to see the display indicate that the data is out

of range. Overrange is indicated by . x10-. Underrange is indicated by 0.0 x10-.A mea-

sured pressure below 1x10-4 Torr is indicated by 0.0 x10+.In the case of an unconnected or faulty

sensor(s), it is possible to see “ .“,“. “ or “ . “. See trouble shooting section (section 8) for

more detail.

Model 2002 Control Unit Front Panel Figure 3.1

UP SWITCH

DOWN

SWITCH

MODE SWITCH ZERO SWITCH

mbar

Torr

HASTINGS INSTRUMENTS

DUAL SENSOR VACUUM GAUGE

MODEL 2002

Model 2002

Control Unit

Front Panel

page 10 Model 2002

All six modes of the Model 2002 have features which can be accessed and modified after bypassing

the front panel interlock. The interlock is in place to prevent the accidental corruption of the

instrument’s configuration and calibration. The interlock is bypassed using the following steps:

1. Place the instrument in one of the six modes.

2. Simultaneously press the up and down switches.

The mode light will now flash indicating that the interlock has been bypassed.

Scientific NotaScientific Nota

Scientific Notationtion

tiontion

tion

The Model 2002 measures pressure that spans more than seven decades.In order to easily display

these readings, Hastings Instruments has employed scientific notation. In scientific notation, the

mantissa (the fixed point part) is multiplied by some power of 10 (given by the exponent).

Powers of 10

103= 1000 10-1 = 0.1

102= 100 10-2 = 0.01

101= 10 10-3 = 0.001

100= 1 10-4 = 0.0001

As an example: 7.60 x 10+2 Torr

mantissa exponent

"7.60 multiplied by 100" = 760Torr which is one atmosphere of pressure.

3.2 RUN Mode

NorNor

Normal Operamal Opera

mal Operamal Opera

mal Operationtion

tiontion

tion

The Model 2002 will automatically enter RUN mode upon start-up. This is the mode for normal

operation and the mode in which the instrument will typically spend most of its time. In the run

mode, the Model 2002 unit will continuously monitor the pressure and update the alarm conditions

at the speed of the A/D converter and will update the display about four times per second.

A/D SpeedA/D Speed

A/D Speed AdjustAdjust

AdjustAdjust

Adjust

The Model 2002 utilizes a 24 bit sigma-delta analog to digital converter. This type of converter

averages the input over time to reject interference.Longer averaging times result in more accurate

readings. Increasing the A/D speed will respond to sudden pressure changes faster.

While in the RUN mode,the user can adjust the A/D speed of operation.At start-up, the instrument

will be operating with an A/D frequency of about 60 Hz. The speed can be adjusted one step faster

or slower.Each step will increase or decrease the A/D frequency by a factor of two.

To adjust the A/D speed, press the MODE switch until the RUN light is illuminated. Then simulta-

neously press the UP and DOWN switches. The RUN light will now flash indicating that the

interlock has been bypassed and the A/D speed can be adjusted. Push the UP switch to speed up

the A/D converter one step and decrease the response time . This will result in a faster triggering of

alarms or relays if a sudden catastrophic failure occurs. Pressing the switch after the limit is reached

has no effect.

Pushing the down switch will slow down theA/D converter and increase its accuracy. This will

improve the ability to resolve low pressure readings. If a certain speed is desired, press the UP or

DOWN switch three times and then press the other switch to select the other speed.

On older units. There will be no indication of the operating speed other than the least significant

digits of the display will tend to run at higher speeds. On units with software version 1.60 and

{

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